CN112581900B - Display device and driving method - Google Patents
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- CN112581900B CN112581900B CN202011605739.7A CN202011605739A CN112581900B CN 112581900 B CN112581900 B CN 112581900B CN 202011605739 A CN202011605739 A CN 202011605739A CN 112581900 B CN112581900 B CN 112581900B
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- 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
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- G09G3/2074—Display of intermediate tones using sub-pixels
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Abstract
The application provides a display device and a driving method, the method comprises the steps that a driving chip compensates first threshold voltage drift of a driving transistor in an internal compensation period of a driving period, the first threshold voltage drift is formed by a gate bias voltage of the driving transistor, the driving transistor drives a display panel to work in the display period of the driving period, a second threshold voltage drift of the driving transistor is compensated in a reverse compensation period of the driving period, and the second threshold voltage drift is formed by a forward current of the driving transistor. According to the method and the device, the threshold voltage drift formed by the grid bias voltage of the driving transistor and the threshold voltage drift formed by the forward current are respectively compensated, so that the threshold voltage drift of the existing driving transistor is relieved, and the normal service life of a product is prolonged.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a display device and a driving method thereof.
Background
With the rapid development of display technology, people increasingly rely on display devices, such as mobile phones, tablets and the like, and the continuous working time of the display devices is prolonged; within the display device, the light emission effect of a sub-pixel is limited by the performance of the drive transistor in the corresponding sub-pixel drive circuit, in particular the threshold voltage of the drive transistor; as the continuous operation time of the display device becomes longer, the threshold voltage of the driving transistor shifts (hereinafter referred to as threshold voltage shift), which may affect the light emitting effect of the sub-pixel, and further cause the display device to display non-uniformly, thereby affecting the service life.
Disclosure of Invention
The embodiment of the application provides a display device and a driving method, which are used for relieving threshold voltage drift of the conventional driving transistor.
The application provides a display device, it includes:
the display panel comprises sub-pixel driving circuits which are arranged in an array mode in a display area, wherein the sub-pixel driving circuits comprise driving transistors;
the driving chip is used for compensating first threshold voltage drift of the driving transistor in an internal compensation period of a driving period, the display panel is driven to work by the driving transistor in a display period of the driving period, second threshold voltage drift of the driving transistor is compensated in a reverse compensation period of the driving period, the first threshold voltage drift is formed by gate bias voltage of the driving transistor, and the second threshold voltage drift is formed by forward current of the driving transistor.
In the display device provided by the application, the driving period comprises first to sixth time periods, the driving chip is used for compensating the first threshold voltage drift of the driving transistor in the first to third time periods, the display panel is driven to work through the driving transistor in the fourth time period, and the second threshold voltage drift of the driving transistor is compensated in the fifth to sixth time periods.
In the display device provided by the present application, the driving chip is configured to:
inputting a compensation voltage to a gate electrode of the driving transistor, inputting a high potential voltage to a first electrode of the driving transistor, inputting a reference voltage to a second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and a pixel electrode during a first period;
inputting a compensation voltage to the gate electrode of the driving transistor in a second time period, continuously inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode;
and in a third time period, inputting a driving voltage to the grid electrode of the driving transistor, continuously inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and opening a conductive path between the second electrode of the driving transistor and the pixel electrode.
In the display device provided by the present application, the driving chip is configured to:
and in a fourth time period, stopping inputting the voltage to the grid electrode of the driving transistor, inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and opening a conductive path between the second electrode of the driving transistor and the pixel electrode.
In the display device provided by the present application, the driving chip is configured to:
in a fifth time period, inputting a driving voltage to the grid electrode of the driving transistor, inputting a low-potential voltage to the first electrode of the driving transistor, inputting a high-potential voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode;
and in a sixth time period, stopping inputting the voltage to the grid electrode of the driving transistor, inputting the high potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode.
The application provides a display device driving method, the display device comprises a display panel and a driving chip, the display panel comprises a sub-pixel driving circuit which is arranged in an array mode in a display area, the sub-pixel driving circuit comprises a driving transistor, and the display device driving method comprises the following steps:
the driving chip compensates for a first threshold voltage drift of the driving transistor during an internal compensation period of a driving cycle, the first threshold voltage drift being formed by a gate bias of the driving transistor;
the driving chip drives the display panel to work through the driving transistor in the display period of the driving cycle;
the driving chip compensates for a second threshold voltage drift of the driving transistor formed by a forward current of the driving transistor in a reverse compensation period of the driving cycle.
In the display device driving method provided by the present application, the driving period includes first to sixth periods in which:
the driving chip compensates for the first threshold voltage drift of the driving transistor in the first to third time periods;
the driving chip drives the display panel to work through the driving transistor in a fourth time period;
the driving chip compensates for the second threshold voltage drift of the driving transistor in fifth to sixth periods of time.
In the driving method of the display device provided by the present application, the compensating, by the driving chip, for the first threshold voltage drift of the driving transistor in the first to third periods of time includes:
inputting a compensation voltage to a gate electrode of the driving transistor, inputting a high potential voltage to a first electrode of the driving transistor, inputting a reference voltage to a second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and a pixel electrode during a first period;
inputting a compensation voltage to the gate electrode of the driving transistor in a second time period, continuously inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode;
and in a third time period, inputting a driving voltage to the grid electrode of the driving transistor, continuously inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and opening a conductive path between the second electrode of the driving transistor and the pixel electrode.
In the driving method of the display device provided by the application, the driving chip drives the display panel to operate through the driving transistor in a fourth time period, including:
and in a fourth time period, stopping inputting the voltage to the grid electrode of the driving transistor, inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and opening a conductive path between the second electrode of the driving transistor and the pixel electrode.
In the driving method of the display device provided by the present application, the compensating, by the driving chip, for the second threshold voltage drift of the driving transistor in the fifth to sixth time periods includes:
in a fifth time period, inputting a driving voltage to the grid electrode of the driving transistor, inputting a low-potential voltage to the first electrode of the driving transistor, inputting a high-potential voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode;
and in a sixth time period, stopping inputting the voltage to the grid electrode of the driving transistor, inputting the high potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode.
Has the advantages that: the application provides a display device and a driving method, the method comprises the steps that a driving chip compensates first threshold voltage drift of a driving transistor in an internal compensation period of a driving period, the first threshold voltage drift is formed by a gate bias voltage of the driving transistor, the driving transistor drives a display panel to work in the display period of the driving period, a second threshold voltage drift of the driving transistor is compensated in a reverse compensation period of the driving period, and the second threshold voltage drift is formed by a forward current of the driving transistor. According to the method and the device, the threshold voltage drift formed by the grid bias voltage of the driving transistor and the threshold voltage drift formed by the forward current are respectively compensated, so that the threshold voltage drift of the existing driving transistor is relieved, and the normal service life of a product is prolonged.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a display device according to the present application.
Fig. 2 is a flowchart of a driving method of a display device according to the present application.
Fig. 3 is a schematic structural diagram of a sub-pixel driving circuit according to the present application.
Fig. 4 is an operation timing diagram of the sub-pixel driving circuit according to the present application.
Fig. 5a to 5f are schematic diagrams illustrating the operation of the sub-pixel driving circuit according to 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. It is to be understood that the embodiments described are only a few embodiments of the present application 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 application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The embodiment of the application provides a display device and a driving method, which are used for relieving threshold voltage drift of the conventional driving transistor.
As shown in fig. 1, the present application provides a display device including:
a display panel 11 including sub-pixel driving circuits arranged in an array in a display region, the sub-pixel driving circuits including driving transistors;
the driving chip 12 is configured to compensate for a first threshold voltage drift of the driving transistor during an internal compensation period of a driving cycle, drive the display panel to operate through the driving transistor during a display period of the driving cycle, and compensate for a second threshold voltage drift of the driving transistor during a reverse compensation period of the driving cycle, where the first threshold voltage drift is formed by a gate bias voltage of the driving transistor, and the second threshold voltage drift is formed by a forward current of the driving transistor.
In one embodiment, the driving cycle includes first to sixth time periods, and the driving chip is configured to compensate for a first threshold voltage drift of the driving transistor in the first to third time periods, drive the display panel through the driving transistor in the fourth time period, and compensate for a second threshold voltage drift of the driving transistor in the fifth to sixth time periods.
In one embodiment, the driving chip is configured to:
inputting a compensation voltage to a gate electrode of the driving transistor, inputting a high potential voltage to a first electrode of the driving transistor, inputting a reference voltage to a second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and a pixel electrode during a first period;
inputting a compensation voltage to the gate electrode of the driving transistor in a second time period, continuously inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode;
and in a third time period, inputting a driving voltage to the grid electrode of the driving transistor, continuously inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and opening a conductive path between the second electrode of the driving transistor and the pixel electrode.
In one embodiment, the driving chip is configured to:
and in a fourth time period, stopping inputting the voltage to the grid electrode of the driving transistor, inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and opening a conductive path between the second electrode of the driving transistor and the pixel electrode.
In one embodiment, the driving chip is configured to:
in a fifth time period, inputting a driving voltage to the grid electrode of the driving transistor, inputting a low-potential voltage to the first electrode of the driving transistor, inputting a high-potential voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode;
and in a sixth time period, stopping inputting the voltage to the grid electrode of the driving transistor, inputting the high potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode.
As shown in fig. 2, the present application provides a display device driving method including:
step 201: the driving chip compensates for a first threshold voltage drift of the driving transistor during an internal compensation period of a driving cycle, the first threshold voltage drift being formed by a gate bias of the driving transistor;
step 202: the driving chip drives the display panel to work through the driving transistor in the display period of the driving cycle;
step 203: the driving chip compensates for a second threshold voltage drift of the driving transistor formed by a forward current of the driving transistor in a reverse compensation period of the driving cycle.
In one embodiment, the drive cycle includes first through sixth time periods, wherein:
the driving chip compensates for the first threshold voltage drift of the driving transistor in the first to third time periods;
the driving chip drives the display panel to work through the driving transistor in a fourth time period;
the driving chip compensates for the second threshold voltage drift of the driving transistor in fifth to sixth periods of time.
In one embodiment, the driving chip compensating for the first threshold voltage drift of the driving transistor in the first to third periods of time includes:
inputting a compensation voltage to a gate electrode of the driving transistor, inputting a high potential voltage to a first electrode of the driving transistor, inputting a reference voltage to a second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and a pixel electrode during a first period;
inputting a compensation voltage to the gate electrode of the driving transistor in a second time period, continuously inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode;
and in a third time period, inputting a driving voltage to the grid electrode of the driving transistor, continuously inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and opening a conductive path between the second electrode of the driving transistor and the pixel electrode.
In one embodiment, the driving chip driving the display panel through the driving transistor during the fourth period of time includes:
and in a fourth time period, stopping inputting the voltage to the grid electrode of the driving transistor, inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and opening a conductive path between the second electrode of the driving transistor and the pixel electrode.
In one embodiment, the driving chip compensating for the second threshold voltage drift of the driving transistor in the fifth to sixth periods of time includes:
in a fifth time period, inputting a driving voltage to the grid electrode of the driving transistor, inputting a low-potential voltage to the first electrode of the driving transistor, inputting a high-potential voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode;
and in a sixth time period, stopping inputting the voltage to the grid electrode of the driving transistor, inputting the high potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode.
The display device provided in the present application may be a liquid crystal display device or an OLED display device, and the sub-pixel driving circuit may be any circuit including a driving transistor.
As shown in fig. 3, the sub-pixel driving circuit provided by the present application is a 5T1C circuit, in which a transistor T1 is a driving transistor according to the present application, and specifically, as shown in fig. 3, the sub-pixel driving circuit provided by the present application includes: the first transistor T1 to the fifth transistor T5 are connected as shown in fig. 3, and are not described again.
For the circuit shown in fig. 3, the present application provides the control timing shown in fig. 4, the driving period includes a display time length of 2 display frames, OVDD is generally a high voltage provided by a power supply, for example, 32V, OVSS is a low voltage, for example, 0V, etc., voltage Vinit is a compensation voltage for compensating a threshold voltage Vth shift of the driving transistor TFT caused by the display device in real time during operation through an internal compensation circuit, and Vref is a parameter voltage.
In one embodiment, as shown in fig. 4, the period t1 to the period t4 belong to the display frame Fi, and the period t5 and the period t6 belong to the display frame Fi + 1; based on fig. 3 and 4, the logic for implementing the display device driving method of the present application is as follows:
as shown in fig. 5a, in the reset phase, i.e., the first time period T1, the transistor T1, the transistor T2, and the transistor T3 are turned on, the transistor T4 and the transistor T5 are turned off, at this time, a signal of the data line data is input to the gate of the transistor T1 through the transistor T2, a signal of the signal line Verf (the reference voltage Verf) is input to the second electrode of the transistor T1 through the transistor T3, the first electrode of the transistor T1 is connected to the power supply voltage OVDD, the gate voltage Vg of the transistor T1 is Vinit, the drain voltage Vs is Verf, and the gate voltage is OVDD.
As shown in fig. 5b, in the detection phase, that is, in the second time period T2, the transistors T1 and T2 are turned on, the transistors T3, T4 and T5 are turned off, at this time, the signal of the data line data is input to the gate of the transistor T1 through the transistor T2, the gate voltage Vg of the transistor T1 is Vinit, the drain voltage Vs is Vinit-Vth, and the voltage detected by the signal line Verf is that of the voltage Vs, which is changed from Verf to Vinit-Vth.
As shown in fig. 5c, in the voltage writing phase, i.e., the third time period T2, the transistor T1, the transistor T2, and the transistor T5 are turned on, the transistor T4, and the transistor T3 are turned off, and at this time, a signal (driving voltage Vdata) of the data line data is input to the gate of the transistor T1 through the transistor T2, and a difference Vgs between a gate voltage and a drain voltage of the transistor T1 is Vg-Vs Vdata- (Vinit-Vth).
As shown in fig. 5d, during the lighting period, i.e., the fourth time period T4, the transistor T1 and the transistor T5 are turned on, the transistor T2, the transistor T4 and the transistor T3 are turned off, and at this time, the signal (the driving voltage Vdata) of the data line data is input to the gate of the transistor T1 through the transistor T2, the current I ═ k ═ Vgs-Vth (Vgs-Vth) ═ k ═ Vdata-Vinit (Vdata-Vinit) through the transistor T1, where k is a fixed factor, representing a multiplicative relationship, when the current I is independent of the threshold voltage of the transistor T1, since the light emission intensity of the OLED is related to the circuit through the OLED (i.e. the transistor T1), and the light emission intensity of the sub-pixel is also not related to the threshold voltage of the transistor T1, based on the results shown in fig. 5a to 5c, it is achieved that the influence of the Vth shift of the driving TFT caused by the display in operation on the display effect of the display device is compensated in real time based on the internal compensation circuit.
In a display frame from the first period T1 to the fourth period T4, the first electrode of the transistor T1 is connected to the high voltage OVDD, and the current flows from the first electrode to the second electrode.
As shown in fig. 5e, in the reverse compensation input stage after the light emission is ended, that is, in the fifth period T5, the transistor T1, the transistor T2, and the transistor T4 are turned on, the transistor T5, and the transistor T3 are turned off, and at this time, a signal (driving voltage Vdata) of the data line data is input to the gate of the transistor T1 through the transistor T2, the power supply OVDD is changed from a high potential voltage to a low potential voltage OVSS, a signal (high potential voltage OVDD) of the signal line Verf is input to the second electrode of the transistor T1 through the transistor T4, a gate voltage Vg of the transistor T1 is equal to Vdata, a second electrode voltage Vs is equal to Verf OVDD, the first electrode voltage bit OVSS, a polarity of Vds of the transistor T1 is inverted, a current flows from the second electrode to the first electrode, and a current reverse pressure is provided to relieve a threshold voltage shift of the transistor T1 caused by the continuous forward current of the transistor T1.
As shown in fig. 5f, in the reverse compensation reset phase after the end of the light emission, i.e., in the sixth period T6, the transistor T2, the transistor T3, the transistor T4, and the transistor T5 are turned off, and the gate voltage of the transistor T1 becomes a low potential; at this time, the signal (0) of the data line data is input to the gate of the transistor T1 through the transistor T2, the power supply OVDD is restored to the high potential voltage OVDD, and the signal (restored to the low potential) of the signal line Verf completes the reset of the reverse compensation.
Based on the above embodiments, the 5T1C compensation circuit provided by the present application can compensate the Vth shift of the driving TFT caused by the display in real time through the internal compensation circuit, and compensate the threshold voltage shift caused by the forward bias stress of the gate of the driving TFT and the unidirectional current by compensating and displaying in one frame and the reverse current pressure given to the driving TFT in one frame in two consecutive frame times of the display.
In other embodiments of the present application, the transistor T4 may be eliminated to obtain a sub-pixel driving circuit of 4T1C, and the specific working principle and the corresponding control timing thereof may refer to fig. 3 to 5f, which are not described again.
Correspondingly, in other embodiments of the present application, a transistor T 'may be further added, source and drain electrodes of the transistor T' and the transistor T2 are connected in parallel, and are specifically used for compensating for the input of the voltage Vinit under timing control, and specific working principles and corresponding control timings thereof may refer to fig. 3 to 5f, and are not described again.
According to the above embodiment:
the application provides a display device and a driving method, the method comprises the steps that a driving chip compensates first threshold voltage drift of a driving transistor in an internal compensation period of a driving period, the first threshold voltage drift is formed by a gate bias voltage of the driving transistor, the driving transistor drives a display panel to work in the display period of the driving period, a second threshold voltage drift of the driving transistor is compensated in a reverse compensation period of the driving period, and the second threshold voltage drift is formed by a forward current of the driving transistor. According to the method and the device, the threshold voltage drift formed by the grid bias voltage of the driving transistor and the threshold voltage drift formed by the forward current are respectively compensated, so that the threshold voltage drift of the existing driving transistor is relieved, and the normal service life of a product is prolonged.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The display device and the driving method provided by the embodiments of the present application are described in detail above, and the principles and embodiments of the present application are explained herein by applying specific examples, and the description of the embodiments above is only used to help understanding the technical solutions and the core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (6)
1. A display device, comprising:
the display panel comprises sub-pixel driving circuits which are arranged in an array mode in a display area, wherein the sub-pixel driving circuits comprise driving transistors;
the driving chip is used for compensating first threshold voltage drift of the driving transistor in an internal compensation period of a driving period, the display panel is driven to work by the driving transistor in a display period of the driving period, and second threshold voltage drift of the driving transistor is compensated in a reverse compensation period of the driving period, the first threshold voltage drift is formed by gate bias voltage of the driving transistor, and the second threshold voltage drift is formed by forward current of the driving transistor;
the driving period comprises first to sixth time periods, the driving chip is used for compensating the first threshold voltage drift of the driving transistor in the first to third time periods, driving the display panel to work through the driving transistor in the fourth time period, and compensating the second threshold voltage drift of the driving transistor in the fifth to sixth time periods; the driving chip is used for inputting a driving voltage to the grid electrode of the driving transistor, inputting a low-potential voltage to the first electrode of the driving transistor, inputting a high-potential voltage to the second electrode of the driving transistor and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode in a fifth time period; and in a sixth time period, stopping inputting the voltage to the grid electrode of the driving transistor, inputting the high potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode.
2. The display device of claim 1, wherein the driver chip is to:
inputting a compensation voltage to a gate electrode of the driving transistor, inputting a high potential voltage to a first electrode of the driving transistor, inputting a reference voltage to a second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and a pixel electrode during a first period;
inputting a compensation voltage to the gate electrode of the driving transistor in a second time period, continuously inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode;
and in a third time period, inputting a driving voltage to the grid electrode of the driving transistor, continuously inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and opening a conductive path between the second electrode of the driving transistor and the pixel electrode.
3. The display device of claim 2, wherein the driver chip is to:
and in a fourth time period, stopping inputting the voltage to the grid electrode of the driving transistor, inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and opening a conductive path between the second electrode of the driving transistor and the pixel electrode.
4. A driving method of a display device, the display device including a display panel and a driving chip, the display panel including a sub-pixel driving circuit arranged in an array in a display area, the sub-pixel driving circuit including a driving transistor, the driving method comprising:
the driving chip compensates for a first threshold voltage drift of the driving transistor during an internal compensation period of a driving cycle, the first threshold voltage drift being formed by a gate bias of the driving transistor;
the driving chip drives the display panel to work through the driving transistor in the display period of the driving cycle;
the driving chip compensates for a second threshold voltage drift of the driving transistor in a reverse compensation period of the driving cycle, the second threshold voltage drift being formed by a forward current of the driving transistor;
the driving period comprises first to sixth time periods, the driving chip compensates first threshold voltage drift of the driving transistor in the first to third time periods, drives the display panel to work through the driving transistor in the fourth time period, and compensates second threshold voltage drift of the driving transistor in the fifth to sixth time periods; in a fifth time period, the driving chip inputs a driving voltage to the gate electrode of the driving transistor, inputs a low-potential voltage to the first electrode of the driving transistor, inputs a high-potential voltage to the second electrode of the driving transistor, and interrupts a conductive path between the second electrode of the driving transistor and the pixel electrode; and in a sixth time period, stopping inputting the voltage to the grid electrode of the driving transistor, inputting the high potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode.
5. The display device driving method according to claim 4, wherein the driving chip compensating for the first threshold voltage drift of the driving transistor in the first to third periods of time includes:
inputting a compensation voltage to a gate electrode of the driving transistor, inputting a high potential voltage to a first electrode of the driving transistor, inputting a reference voltage to a second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and a pixel electrode during a first period;
inputting a compensation voltage to the gate electrode of the driving transistor in a second time period, continuously inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and interrupting a conductive path between the second electrode of the driving transistor and the pixel electrode;
and in a third time period, inputting a driving voltage to the grid electrode of the driving transistor, continuously inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and opening a conductive path between the second electrode of the driving transistor and the pixel electrode.
6. The method for driving a display device according to claim 5, wherein the driving chip driving the display panel through the driving transistor during a fourth period comprises:
and in a fourth time period, stopping inputting the voltage to the grid electrode of the driving transistor, inputting the high-potential voltage to the first electrode of the driving transistor, stopping inputting the voltage to the second electrode of the driving transistor, and opening a conductive path between the second electrode of the driving transistor and the pixel electrode.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011605739.7A CN112581900B (en) | 2020-12-30 | 2020-12-30 | Display device and driving method |
| PCT/CN2020/142426 WO2022141527A1 (en) | 2020-12-30 | 2020-12-31 | Display device and driving method |
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| CN202011605739.7A CN112581900B (en) | 2020-12-30 | 2020-12-30 | Display device and driving method |
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| CN112581900B true CN112581900B (en) | 2021-12-28 |
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| KR20110013693A (en) * | 2009-08-03 | 2011-02-10 | 삼성모바일디스플레이주식회사 | Organic light emitting display and driving method thereof |
| KR102563968B1 (en) * | 2016-11-21 | 2023-08-04 | 엘지디스플레이 주식회사 | Display Device |
| CN111312160B (en) * | 2020-03-31 | 2021-06-01 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit and display panel |
| CN111402789B (en) * | 2020-04-08 | 2021-03-16 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit and display panel |
| CN111653240A (en) * | 2020-06-30 | 2020-09-11 | 京东方科技集团股份有限公司 | Pixel driving circuit and driving method thereof, display panel and driving method thereof |
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| CN112581900A (en) | 2021-03-30 |
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