CN114220397B - Display panel, driving method thereof and display device - Google Patents
Display panel, driving method thereof and display device 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
- G09G3/3233—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 current through the light-emitting element
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
The embodiment of the invention provides a display panel, a driving method thereof and a display device, relates to the technical field of display, and improves the detection precision of threshold voltage. The display panel includes a display area including a light emitting element and a pixel circuit connected to the light emitting element, the pixel circuit including: a driving transistor connected between the first fixed potential signal line and a first electrode of the light emitting element; the data writing module is connected between the data line and the grid electrode of the driving transistor; a detection module connected between the first electrode of the light emitting element and the detection signal line; the first polar plate of the storage capacitor is electrically connected with the grid electrode of the driving transistor; and the charging control module comprises a first capacitor and a control unit, the first capacitor is connected between the second polar plate of the storage capacitor and the first pole of the light-emitting element, and the control unit is respectively connected with the first polar plate of the first capacitor and the second polar plate of the first capacitor and is used for controlling the first capacitor to be charged in a detection time period and not to be charged in a compensation time period.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a display panel, a driving method thereof and a display device.
[ background of the invention ]
An Organic light-emitting diode (OLED) display panel includes electrically connected pixel circuits and light-emitting elements, and the pixel circuits are used for transmitting driving current to the light-emitting elements to drive the light-emitting elements to emit light.
Currently, in order to improve the brightness uniformity of the display panel, it is usually necessary to compensate the threshold voltage of the driving transistor in the pixel circuit. However, in the prior art, the detection accuracy of the threshold voltage is low, and the compensation accuracy is low.
[ summary of the invention ]
Embodiments of the present invention provide a display panel, a driving method thereof, and a display device, so as to improve the detection accuracy of the threshold voltage of the driving transistor.
In one aspect, an embodiment of the present invention provides a display panel, where the display panel includes a display area, and the display area includes a light emitting element and a pixel circuit connected to the light emitting element, where the pixel circuit includes:
a driving transistor electrically connected between a first fixed potential signal line and a first electrode of the light emitting element;
the data writing module is electrically connected between a data line and the grid electrode of the driving transistor;
a detection module electrically connected between the first electrode of the light emitting element and the detection signal line;
a first polar plate of the storage capacitor is electrically connected with the grid electrode of the driving transistor;
and the charging control module comprises a first capacitor and a control unit, the first capacitor is electrically connected between the second plate of the storage capacitor and the first electrode of the light-emitting element, and the control unit is respectively electrically connected with the first plate of the first capacitor and the second plate of the first capacitor and is used for controlling the first capacitor to be charged in a detection period and not to be charged in a compensation period.
On the other hand, an embodiment of the present invention provides a driving method for a display panel, which is applied to the display panel, wherein a working process of the display panel includes a detection period and a compensation period, and the driving method includes:
in the detection period, the data writing module writes a data voltage into the grid electrode of the driving transistor, the control unit controls the first capacitor to be charged, and the detection module captures the threshold voltage of the driving transistor;
in the compensation period, the data writing module writes a data voltage into the gate of the driving transistor, and the control unit controls the first capacitor not to be charged.
In another aspect, an embodiment of the present invention provides a display device, which includes the display panel.
One of the above technical solutions has the following beneficial effects:
according to the embodiment of the invention, the charging control module is additionally arranged in the pixel circuit, on one hand, a newly added first capacitor can be connected in series with the pixel circuit in a detection period to form an equivalent capacitor in series with the storage capacitor, and the capacitance value of the equivalent capacitor formed after the first capacitor and the storage capacitor are connected in series is smaller than that of a single storage capacitor according to a capacitor series calculation formula. Even if the detection time is short, the voltage of the first electrode of the light-emitting element collected by the detection module is the voltage corresponding to the full-charged capacitor, so that the detection precision of the threshold voltage is improved, particularly the threshold detection precision of the display panel driven by a high refresh rate is improved, and the compensation effect is further improved. On the other hand, the newly added first capacitor can be controlled not to work in the compensation period, so that the influence of the first capacitor on the work of the pixel circuit is avoided, and the capacitor requirement of the pixel circuit in the normal work process is ensured.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described 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.
FIG. 1 is a schematic diagram of a pixel circuit in the prior art;
FIG. 2 is a schematic diagram of another prior art pixel circuit;
FIG. 3 is a schematic diagram of a prior art charging of a storage capacitor;
fig. 4 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a pixel circuit according to an embodiment of the invention;
fig. 6 is a schematic structural diagram of a pixel circuit according to an embodiment of the invention;
FIG. 7 is a timing diagram corresponding to FIG. 5;
fig. 8 is a schematic structural diagram of a pixel circuit according to an embodiment of the invention;
FIG. 9 is a timing diagram corresponding to FIG. 8;
FIG. 10 is another timing diagram corresponding to FIG. 8;
fig. 11 is a schematic diagram of another structure of a pixel circuit according to an embodiment of the invention;
FIG. 12 is a timing diagram corresponding to FIG. 11;
FIG. 13 is another timing diagram corresponding to FIG. 11;
fig. 14 is a schematic diagram of another structure of a pixel circuit according to an embodiment of the invention;
fig. 15 is a schematic structural diagram of a display device according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all 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 invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the description of the invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely a relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
To more clearly illustrate the technical solution provided by the embodiment of the present invention, the present invention first explains the structure of the existing pixel circuit and the problems existing in the prior art:
a pixel circuit in a conventional display panel may specifically adopt a 2T1C structure shown in fig. 1, as shown in fig. 1, fig. 1 is a schematic structural diagram of a pixel circuit in the prior art, and the pixel circuit includes a driving transistor M0', a data writing transistor M1', and a storage capacitor Cst '.
In the operation of the pixel circuit, the Data writing transistor M1 'first responds to the first Scan signal supplied from the first Scan signal line Scan1' to apply the Data voltage V supplied from the Data line Data Data The gate of the ' write drive transistor M0' controls the drive transistor M0' to be turned on. It will be appreciated that the number of writesAccording to voltage V Data 'different, the driving transistor M0' is turned on to a different degree. Then, a power signal supplied from the power signal line VDD ' is transmitted to the anode of the light emitting element D ' via the turned-on driving transistor M0', and charges the storage capacitor Cst ' until the anode potential of the light emitting element D ' is charged to V Data ' -Vth ', the driving transistor M0' is turned off, where Vth ' is the threshold voltage of the driving transistor M0 '.
In the process of manufacturing the display panel, the threshold voltage Vth 'of the driving transistor M0' in different pixel circuits is different under the influence of temperature variation, which results in the same data voltage V Data The luminance of the next different light emitting devices D' is different, which affects the uniformity of the luminance of the display panel.
Therefore, in the prior art, a detection transistor is further added in the pixel circuit, and the threshold voltage of the driving transistor M0' is detected by using the detection transistor, so that the threshold voltage is compensated. As shown in fig. 2, fig. 2 is another structural schematic diagram of a pixel circuit in the prior art, the pixel circuit further includes a detection transistor M2', and the detection transistor M2' transmits the anode potential of the light emitting device D ' to the detection signal line Vsen ' in response to a second Scan signal provided by a second Scan signal line Scan2', so as to detect the anode potential Vd ' of the light emitting device D '. Due to the data voltage V Data 'is known and can therefore be determined by Vd' -V Data The ' threshold voltage Vth ' of the driving transistor M0' is known ', and then the pixel circuit is externally compensated according to the detected threshold voltage Vth '.
However, the data voltage V Data After writing to the gate of the driving transistor M0', as shown in fig. 3, fig. 3 is a schematic diagram of charging the storage capacitor in the prior art, in which the charging rate v of the storage capacitor Cst' gradually becomes slower as the charging time T increases, and especially the charging of the storage capacitor Cst 'is slower at the final stage of charging, i.e. a period of time before the driving transistor M0' is turned off. Thus, when the detection time is shortened, it may occur that the collected anode potential Vd 'is regarded as V when the storage capacitor Cst' is not yet filled with the anode potential Vd Data '-Vth', which in turn results inThe obtained threshold voltage is inaccurate, and the compensation effect is poor. Especially, as the refresh frequency of the display panel is higher, the detection time of the pixel circuit in each frame is shorter, and thus the threshold detection accuracy is worse.
In order to solve the above problem, embodiments of the present invention provide a display panel, which can effectively improve the detection accuracy of the threshold voltage of the driving transistor.
As shown in fig. 4, fig. 4 is a schematic structural diagram of a display panel according to an embodiment of the present invention, the display panel includes a display Area 1, and the display Area 1 is an Area for displaying a picture, which is also called an AA (Active Area) Area in the display panel. The display region 1 includes a light emitting element D and a pixel circuit 3 connected to the light emitting element D.
As shown in fig. 5, fig. 5 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention, and the pixel circuit 3 includes a driving transistor M0, a data writing module 4, a detecting module 5, and a storage capacitor Cst. Wherein the driving transistor M0 is electrically connected between the first fixed potential signal line V1 and the first electrode of the light emitting element D; the Data writing module 4 is electrically connected between the Data line Data and the gate of the driving transistor M0, and is used for writing a Data voltage to the gate of the driving transistor M0 during the detection period and the compensation period; the detection module 5 is electrically connected between the first electrode of the light emitting element D and the detection signal line Vsen, and is configured to capture the threshold voltage of the driving transistor M0 during a detection period; the first plate of the storage capacitor Cst is electrically connected to the gate electrode of the driving transistor M0.
The pixel circuit 3 further includes a charging control module 6, the charging control module 6 includes a first capacitor C1 and a control unit 7, the first capacitor C1 is electrically connected between the second plate of the storage capacitor Cst and the first electrode of the light emitting element D, and the control unit 7 is electrically connected to the first plate of the first capacitor C1 and the second plate of the first capacitor C1 respectively, and is configured to control the first capacitor C1 to be charged during the detection period and not to be charged during the compensation period.
Specifically, the operation process of the display panel includes a detection period and a compensation period.
In a detection period, the Data writing module 4 writes a Data voltage provided by the Data line Data into the gate of the driving transistor M0 to control the driving transistor M0 to be turned on, in the period, the control unit 7 controls the first capacitor C1 to be charged, at this time, the first fixed potential signal provided by the first fixed potential signal line V1 charges an equivalent capacitor formed by the first capacitor C1 and the storage capacitor Cst in series, and then the detection module 5 is used for collecting a voltage of the first electrode of the light emitting element D to obtain a threshold voltage of the driving transistor M0 according to the collected voltage.
In the compensation period, the Data writing module 4 writes the compensated Data voltage provided by the Data line Data into the gate of the driving transistor M0 to control the driving transistor M0 to be turned on, and in this period, the control unit 7 controls the first capacitor C1 not to be charged, and at this time, the first fixed potential signal charges only the storage capacitor Cst.
As can be seen from the above, the charging control module 6 is added in the pixel circuit 3 in the embodiment of the present invention, on one hand, the newly added first capacitor C1 can be connected in series to the pixel circuit 3 in the detection period, so that the first capacitor C and the storage capacitor Cst are connected in series, and according to the capacitor series calculation formula, the capacitance value of the equivalent capacitor formed by the two capacitors connected in series is smaller than that of a single storage capacitor Cst. Even if the detection time is short, the voltage of the first electrode of the light-emitting element D collected by the detection module 5 is the voltage corresponding to the capacitor when the capacitor is fully charged, so that the detection accuracy of the threshold voltage is improved, especially the threshold detection accuracy of the display panel driven at a higher refresh rate is improved, and the compensation effect is further improved. On the other hand, the newly added first capacitor C1 can also be controlled not to work in the compensation period, so that the influence of the first capacitor C1 on the work of the pixel circuit 3 is avoided, and the capacitor requirement of the pixel circuit 3 in the normal work process is ensured.
In summary, the embodiment of the present invention utilizes the charging control module 6 to realize that different charging capacitance values are set in the detection period and the compensation period, so that the detection precision of the threshold value in the detection period is improved, and the capacitance requirement of the pixel circuit in the compensation period during normal operation can be ensured.
In addition, it should be noted that, in the embodiment of the present invention, referring to fig. 5 again, the first fixed potential signal line V1 may be a positive power signal line VDD, in which case, the first pole of the light emitting element D is the anode of the light emitting element D, the second pole of the light emitting element D is the cathode of the light emitting element D, and the cathode of the light emitting element D is electrically connected to the negative power signal line VSS. Alternatively, as shown in fig. 6, fig. 6 is another structural schematic diagram of the pixel circuit provided in the embodiment of the invention, the first fixed potential signal line V1 may also be a negative power signal line VSS, in which case, the first pole of the light emitting element D is the cathode of the light emitting element D, the second pole of the light emitting element D is the anode of the light emitting element D, and the anode of the light emitting element D is electrically connected to the positive power signal line VDD. It is understood that the pixel circuits 3 of the above two structures operate in the same principle, and only the data voltages required for the same gray-scale luminance are different.
Further, according to the capacitance series calculation formula, the capacitance value of the equivalent capacitance formed by the first capacitor C1 and the storage capacitor Cst in series during the detection period
Wherein C1 is the capacitance of the first capacitor C1, and Cst is the capacitance of the storage capacitor Cst. In the embodiment of the invention, in order to further reduce the capacitance required to be charged in the detection period and further shorten the time required for the capacitor to be fully charged to a greater extent, the capacitance value of the first capacitor C1 may be smaller than or equal to the capacitance value of the storage capacitor Cst, and at this time, the capacitance value of the equivalent capacitor is smaller than or equal to ≥>
The storage capacitance Cst is greatly reduced compared to the storage capacitance Cst.
In addition, when the capacitance value of the first capacitor C1 is smaller than that of the storage capacitor Cst, besides the capacitance value required to be charged in the detection period can be significantly reduced, compared with the storage capacitor Cst, the first capacitor C1 can have a smaller plate right-facing area, so that the space occupied by the first capacitor C1 in the pixel circuit 3 can be reduced, the overall space of the pixel circuit 3 is further reduced, and the pixel density of the display panel is improved.
When the capacitance of the first capacitor C1 is equal to the capacitance of the storage capacitor Cst, besides the capacitance required to be charged in the detection period can be significantly reduced, the electrode plate facing area, the electrode plate distance, the electrode plate material and other parameters of the first capacitor C1 can be set to be the same as those of the storage capacitor Cst, so that the design complexity of the first capacitor C1 can be simplified.
In a possible embodiment, referring again to fig. 5 and 6, the control unit 7 comprises a control transistor M1, a first pole of the control transistor M1 being electrically connected to the first plate of the first capacitor C1, and a second pole of the control transistor M1 being electrically connected to the second plate of the first capacitor C1. The control transistor M1 is configured to be turned off during the detection period and turned on during the compensation period.
In the detection period, the control transistor M1 is turned off, and the control transistor M1 does not affect the normal charging of the first capacitor C1, so that the first capacitor C1 and the storage capacitor Cst are connected in series to form an equivalent capacitor with a smaller capacitance value. In the compensation period, the transistor M1 is controlled to be turned on to short-circuit the first capacitor C1, so that the first capacitor C1 cannot work in the compensation period, and only the storage capacitor Cst is charged.
In one possible embodiment, referring again to fig. 5 and 6, the sensing module 5 includes a sensing transistor M2, a gate of the sensing transistor M2 is electrically connected to the first Scan signal line Scan1, a first pole of the sensing transistor M2 is electrically connected to the first pole of the light emitting element D, and a second pole of the sensing transistor M2 is electrically connected to the sensing signal line Vsen. The gate of the control transistor M1 is electrically connected to the first Scan signal line Scan1, and the transistor types of the control transistor M1 and the detection transistor M2 are opposite.
Taking the control transistor M1 as a P-type transistor and the detection transistor M2 as an N-type transistor as an example, with reference to the timing chart shown in fig. 7, during the detection period T1, the first Scan signal line Scan1 provides a high level to control the detection transistor M2 to be turned on and the control transistor M1 to be turned off, the control transistor M1 controls the first capacitor C1 to be connected in series with the storage capacitor Cst to form an equivalent capacitor with a smaller capacitance value, and the detection transistor M2 transmits the potential of the first electrode of the light emitting element D to the detection signal line Vsen to achieve the detection of the threshold voltage. In the compensation period T2, the first Scan signal line Scan1 provides a low level to control the detection transistor M2 to be turned off and the control transistor M1 to be turned on, and then the control transistor M1 is turned on to short-circuit the first capacitor C1, so that the first capacitor C1 cannot be charged, and thus only the storage capacitor Cst is charged in the compensation period T2, thereby ensuring the capacitance requirement of the pixel circuit 3 during normal operation.
In the above structure, the control transistor M1 and the detection transistor M2 are electrically connected to the same scanning signal line, on one hand, no additional driving signal line needs to be provided for the control transistor M1, thereby reducing the wiring in the display panel, and on the other hand, the control mode is simpler because the control transistor M1 is turned off in synchronization with the turning on of the detection transistor M2.
In the embodiments of the present invention, the detecting transistor M2 is an N-type transistor, and it is understood that the detecting transistor M2 may also be a P-type transistor. If the detecting transistor M2 is a P-type transistor, the controlling transistor M1 is an N-type transistor when the transistor types of the controlling transistor M1 and the detecting transistor M2 are opposite. It is understood that whether the detection transistor M2 is an N-type transistor or a P-type transistor, the operation state of the detection transistor M2 is the same in the same period, and only the level state provided by the first Scan signal line Scan1 connected thereto is different.
In a possible implementation manner, as shown in fig. 8, fig. 8 is a schematic structural diagram of a pixel circuit according to an embodiment of the invention, in which the detecting module 5 includes a detecting transistor M2, a gate of the detecting transistor M2 is electrically connected to the first Scan signal line Scan1, a first pole of the detecting transistor M2 is electrically connected to the first pole of the light emitting element D, and a second pole of the detecting transistor M2 is electrically connected to the detecting signal line Vsen. The gate of the control transistor M1 is electrically connected to the second scanning signal line.
In this arrangement, the control transistor M1 and the detection transistor M2 are electrically connected to different scanning signal lines, so that the turning-off of the control transistor M1 and the turning-on of the detection transistor M2 may be performed synchronously or asynchronously, and the control of the operating states of the control transistor M1 and the detection transistor M2 is more flexible.
Taking the detecting transistor M2 as an N-type transistor and the controlling transistor M1 as a P-type transistor as an example, when the turning-off of the controlling transistor M1 and the turning-on of the detecting transistor M2 are performed synchronously, as shown in fig. 9, fig. 9 is a timing chart corresponding to fig. 8, the first Scan signal line Scan1 provides a high level in the whole detecting period T1 to control the detecting transistor M2 to be turned on in the whole detecting period T1, and the second Scan signal line Scan also provides a high level in the whole detecting period T1 to control the controlling transistor M1 to be turned off in the whole detecting period T1.
When the turning-off of the control transistor M1 and the turning-on of the detection transistor M2 are not performed synchronously, as shown in fig. 10, fig. 10 is another timing diagram corresponding to fig. 8, and the detection period T1 includes a data writing sub-period T11 and a threshold grasping sub-period T12, wherein the data writing module 4 writes a data voltage into the gate of the driving transistor M0 in the data writing sub-period T11. In the data writing sub-period T11, the first Scan signal line Scan1 provides a low level to control the detection transistor M2 to be turned off, the second Scan signal line provides a high level to control the control transistor M1 to be turned off, in the threshold value capturing sub-period T12, the first Scan signal line Scan1 provides a high level to control the detection transistor M2 to be turned on, and the second Scan signal line continues to provide a high level to control the control transistor M1 to continue to be turned off. In this driving manner, the sensing transistor M2 is turned on only in the threshold grasping sub-period T12, and the voltage transmitted to the sensing signal line Vsen approaches the voltage of the first pole of the light emitting element D after the gate electrode Yu Dianrong is fully charged, which is closer to V Data Vth, at which the acquired threshold voltage is more accurate.
When the control transistor M1 and the detection transistor M2 are electrically connected to different scanning signal lines, further, as shown in fig. 11, fig. 11 is another schematic structural diagram of the pixel circuit provided in the embodiment of the present invention, and the control transistor M1 may be of the same type as the detection transistor M2, at this time, the process of the film layers in the control transistor M1 and the detection transistor M2 is the same, so that the process of the display panel is simpler.
Taking the control transistor M1 and the detection transistor M2 both being N-type transistors as an example, as shown in fig. 12, fig. 12 is a timing chart corresponding to fig. 11, the first Scan signal line Scan1 provides a high level to control the detection transistor M2 to be turned on during the whole detection period T1, and the second Scan signal line provides a low level to control the control transistor M1 to be turned off during the whole detection period T1. Alternatively, to further improve the threshold detection accuracy, as shown in fig. 13, fig. 13 is another timing chart corresponding to fig. 11, and the first Scan signal line Scan1 may also provide a high level only in the threshold compensation sub-period T21 to control the detection transistor M2 to be turned on only in the threshold compensation sub-period T21.
It should be noted that, in other alternative embodiments of the present invention, when the control transistor M1 and the detection transistor M2 are electrically connected to different scanning signal lines, respectively, the transistor types of the control transistor M1 and the detection transistor M2 may also be reversed, for example, referring to fig. 8 again, the detection transistor M2 is an N-type transistor, and the control transistor M1 is a P-type transistor, or the detection transistor M2 is a P-type transistor, and the control transistor M1 is an N-type transistor.
In a possible implementation manner, as shown in fig. 14, fig. 14 is a schematic structural diagram of a pixel circuit provided in an embodiment of the invention, where the control unit 7 includes at least two control transistors M1 arranged in parallel, gates of the at least two control transistors M1 are electrically connected, first electrodes of the at least two control transistors M1 are electrically connected to a first plate of the first capacitor C1, and second electrodes of the at least two control transistors M1 are electrically connected to a second plate of the first capacitor C1. The control transistor M1 is configured to be turned off during the detection period T1 and to be turned on during the compensation period T2.
By providing a plurality of control transistors M1 in parallel in the control unit 7, the reliability of the control unit 7 for controlling the charging state of the first capacitor C can be improved. For example, in the compensation period T2, when one control transistor M1 is damaged and cannot be turned on, the other turned-on control transistors M1 can still be used to short-circuit the first capacitor C1.
In one possible implementation, referring again to fig. 5, the Data writing module 4 includes a Data writing transistor, a gate of the Data writing transistor is electrically connected to the third Scan signal line Scan3, a first pole of the Data writing transistor is electrically connected to the Data line Data, a second pole of the Data writing transistor is electrically connected to the gate of the driving transistor M0, and the Data writing transistor is configured to write the Data voltage provided by the Data line Data to the gate of the driving transistor M0 in response to the third Scan signal provided by the third Scan signal line Scan3 during the detection period T1 and the compensation period T2.
Based on the same inventive concept, the embodiment of the invention also provides a driving method of the display panel, and the driving method is applied to the display panel. With reference to fig. 4 to 7, the working process of the display panel includes a detection period T1 and a compensation period T2, and the driving method includes:
in the detection period T1, the data writing module 4 writes a data voltage into the gate of the driving transistor M0, the control unit 7 controls the first capacitor C1 to be charged, and the detection module 5 captures a threshold voltage of the driving transistor M0.
In the compensation period T2, the data writing module 4 writes the data voltage to the gate of the driving transistor M0, and the control unit 7 controls the first capacitor C1 not to be charged. It should be noted that, in this period, the data voltage written by the data writing module 4 is the data voltage after threshold compensation.
The specific working principle of the data writing module 4, the detection module 5 and the charging control module 6 in the detection period T1 and the compensation period T2 has been described in the above embodiments, and is not described herein again.
In the embodiment of the present invention, on the one hand, during the detection period T1, the control unit 7 controls the first capacitor C1 to charge, so that the first capacitor C1 and the storage capacitor Cst are connected in series to form an equivalent capacitor, thereby reducing the size of the capacitor to be charged during the detection period T1, further shortening the time from the start of charging to the time when the capacitor is fully charged, and making the voltage of the first electrode of the light emitting element D collected by the detection module 5 be the voltage corresponding to the voltage when the capacitor is fully charged, thereby improving the detection accuracy of the threshold voltage. On the other hand, in the compensation period T2, the control unit 7 controls the non-operation, so that the influence of the first capacitor C1 on the operation of the pixel circuit 3 can be avoided, and the capacitor requirement of the pixel circuit 3 during the normal operation can be ensured.
In a possible embodiment, referring again to fig. 5 and 7, the control unit 7 includes a control transistor M1, a first pole of the control transistor M1 is electrically connected to the first plate of the first capacitor C1, and a second pole of the control transistor M1 is electrically connected to the second plate of the first capacitor C1.
Based on this, during the detection period T1, the process of controlling the first capacitor C1 to charge by the control unit 7 includes: at the detection time period T1, the control transistor M1 is turned off, and at this time, the control transistor M1 does not affect the normal charging of the first capacitor C1, so that it can be ensured that the first capacitor C1 and the storage capacitor Cst are connected in series to form an equivalent capacitor with a smaller capacitance value. In the compensation period T2, the process of controlling the first capacitor C1 not to be charged by the control unit 7 includes: the transistor M1 is controlled to be turned on, so that the first capacitor C1 is short-circuited, and the first capacitor C1 cannot work in the period, thereby charging only the storage capacitor Cst.
Further, referring to fig. 8 and 9, the detection module 5 includes a detection transistor M2, a gate of the detection transistor M2 is electrically connected to the first Scan signal line Scan1, a first pole of the detection transistor M2 is electrically connected to the first pole of the light emitting element D, and a second pole of the detection transistor M2 is electrically connected to the detection signal line Vsen. The gate of the control transistor M1 is electrically connected to the second scanning signal line.
Based on this, the detection period T1 includes a data writing sub-period T11 and a threshold grasping sub-period T12. In the data writing sub-period T11, the control transistor M1 is turned off by the second scan signal, and the detection transistor M2 is turned off by the first scan signal. In the threshold grasping sub-period T12, the control transistor M1 is turned off by the second scan signal, and the detection transistor M2 is turned on by the first scan signal.
In the above driving method, the turning-off of the control transistor M1 and the turning-on of the detection transistor M2 are not synchronized, the detection transistor M2 is turned on only in the threshold grabbing sub-period T12, and the voltage transmitted to the detection signal line Vsen is the voltage of the first electrode of the light emitting device D after the capacitor is fully charged, and the voltage is closer to V Data Vth, at which the acquired threshold voltage is more accurate.
Alternatively, with reference to fig. 5 and 7, the detection module 5 includes a detection transistor M2, a gate of the detection transistor M2 is electrically connected to the first Scan signal line Scan1, a first pole of the detection transistor M2 is electrically connected to the first pole of the light emitting element D, and a second pole of the detection transistor M2 is electrically connected to the detection signal line Vsen. The control transistor M1 is of the opposite transistor type to the detection transistor M2, and the gate of the control transistor M1 is electrically connected to the first Scan signal line Scan 1.
Based on this, the detection period T1 includes a data writing sub-period T11 and a threshold grasping sub-period T12. In the data writing sub-period T11, the control transistor M1 is turned off by the first scan signal, and the detection transistor M2 is turned on by the first scan signal. In the threshold grasping sub-period T12, the control transistor M1 is turned off by the first scan signal, and the detection transistor M2 is turned on by the first scan signal.
In the above driving method, the control transistor M1 and the detection transistor M2 are electrically connected to the same scan signal line, on one hand, no additional driving signal line needs to be provided for the control transistor M1, thereby reducing the wiring in the display panel, and on the other hand, the turning-off of the control transistor M1 is performed in synchronization with the turning-on of the detection transistor M2, thereby simplifying the control method.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, as shown in fig. 15, fig. 15 is a schematic structural diagram of the display device provided in the embodiment of the present invention, and the display device includes the display panel. The specific structure of the display panel 100 has been described in detail in the above embodiments, and is not described herein again. Of course, the display device shown in fig. 15 is only a schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (13)
1. A display panel comprising a display region including a light emitting element and a pixel circuit connected to the light emitting element, wherein the pixel circuit comprises:
a driving transistor electrically connected between a first fixed potential signal line and a first electrode of the light emitting element;
the data writing module is electrically connected between the data line and the grid electrode of the driving transistor;
a detection module electrically connected between the first electrode of the light emitting element and the detection signal line;
the first polar plate of the storage capacitor is electrically connected with the grid electrode of the driving transistor;
and the charging control module comprises a first capacitor and a control unit, the first capacitor is electrically connected between the second plate of the storage capacitor and the first electrode of the light-emitting element, and the control unit is respectively electrically connected with the first plate of the first capacitor and the second plate of the first capacitor and is used for controlling the first capacitor to be charged in a detection period and not to be charged in a compensation period.
2. The display panel according to claim 1,
the capacitance value of the first capacitor is smaller than or equal to the capacitance value of the storage capacitor.
3. The display panel according to claim 1,
the control unit comprises a control transistor, a first pole of the control transistor is electrically connected with a first pole plate of the first capacitor, and a second pole of the control transistor is electrically connected with a second pole plate of the first capacitor;
the control transistor is used for being turned off in the detection period and being turned on in the compensation period.
4. The display panel according to claim 3,
the detection module includes a detection transistor, a gate of the detection transistor is electrically connected to a first scanning signal line, a first pole of the detection transistor is electrically connected to a first pole of the light emitting element, and a second pole of the detection transistor is electrically connected to the detection signal line;
the grid electrode of the control transistor is electrically connected with the first scanning signal line, and the transistor type of the control transistor is opposite to that of the detection transistor.
5. The display panel according to claim 3,
the detection module includes a detection transistor, a gate of the detection transistor is electrically connected to a first scanning signal line, a first pole of the detection transistor is electrically connected to a first pole of the light emitting element, and a second pole of the detection transistor is electrically connected to the detection signal line;
the gate of the control transistor is electrically connected to the second scanning signal line.
6. The display panel according to claim 5,
the control transistor is of the same transistor type as the detection transistor.
7. The display panel according to claim 1,
the control unit comprises at least two control transistors which are arranged in parallel, the grid electrodes of the at least two control transistors are electrically connected, the first electrodes of the at least two control transistors are electrically connected with the first polar plate of the first capacitor, and the second electrodes of the at least two control transistors are electrically connected with the second polar plate of the first capacitor;
the control transistor is used for being turned off in the detection period and being turned on in the compensation period.
8. The display panel according to claim 1,
the data writing module comprises a data writing transistor, a grid electrode of the data writing transistor is electrically connected with a third scanning signal line, a first pole of the data writing transistor is electrically connected with the data line, and a second pole of the data writing transistor is electrically connected with a grid electrode of the driving transistor.
9. A driving method of a display panel applied to the display panel according to any one of claims 1 to 8, wherein an operation process of the display panel includes a detection period and a compensation period, the driving method comprising:
in the detection period, the data writing module writes a data voltage into the grid electrode of the driving transistor, the control unit controls the first capacitor to be charged, and the detection module captures the threshold voltage of the driving transistor;
in the compensation period, the data writing module writes a data voltage into the gate of the driving transistor, and the control unit controls the first capacitor not to be charged.
10. The driving method according to claim 9,
the control unit comprises a control transistor, a first pole of the control transistor is electrically connected with a first pole plate of the first capacitor, and a second pole of the control transistor is electrically connected with a second pole plate of the first capacitor;
during the detection period, the process of controlling the first capacitor to charge by the control unit comprises the following steps: in the detection period, the control transistor is turned off;
during the compensation period, the process of controlling the first capacitor not to be charged by the control unit comprises the following steps: the control transistor is turned on to short-circuit the first capacitor.
11. The driving method according to claim 10,
the detection module includes a detection transistor, a gate of the detection transistor is electrically connected to a first scanning signal line, a first pole of the detection transistor is electrically connected to a first pole of the light emitting element, and a second pole of the detection transistor is electrically connected to the detection signal line;
the grid electrode of the control transistor is electrically connected with the second scanning signal line;
the detection period comprises a data writing sub-period and a threshold grabbing sub-period;
in the data writing sub-period, the control transistor is turned off under the action of a second scanning signal, and the detection transistor is turned off under the action of a first scanning signal;
in the threshold grabbing sub-period, the control transistor is turned off under the action of the second scanning signal, and the detection transistor is turned on under the action of the first scanning signal.
12. The driving method according to claim 10,
the detection module includes a detection transistor, a gate of the detection transistor is electrically connected to a first scanning signal line, a first pole of the detection transistor is electrically connected to a first pole of the light emitting element, and a second pole of the detection transistor is electrically connected to the detection signal line;
the control transistor is opposite to the transistor type of the detection transistor, and the grid electrode of the control transistor is electrically connected with the first scanning signal line;
the detection period comprises a data writing sub-period and a threshold grabbing sub-period;
in the data writing sub-period, the control transistor is turned off under the action of a first scanning signal, and the detection transistor is turned on under the action of the first scanning signal;
in the threshold grasping sub-period, the control transistor is turned off by the first scan signal,
the detection transistor is turned on under the action of the first scanning signal.
13. A display device comprising the display panel according to any one of claims 1 to 8.
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| US10902785B2 (en) * | 2019-06-10 | 2021-01-26 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Pixel driving circuit |
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