CN111599316A - Display device and driving method thereof - Google Patents
Display device and driving method thereof Download PDFInfo
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- CN111599316A CN111599316A CN202010478498.8A CN202010478498A CN111599316A CN 111599316 A CN111599316 A CN 111599316A CN 202010478498 A CN202010478498 A CN 202010478498A CN 111599316 A CN111599316 A CN 111599316A
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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]
- G09G3/3275—Details of drivers for data 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
- G09G2310/0264—Details of driving circuits
Abstract
The embodiment of the invention discloses a display device and a driving method thereof, wherein the display device comprises: a pixel circuit including a driving transistor; a data line connected to the pixel circuit; a display driver configured to output a detection voltage to the data line in a detection stage, detect a voltage on the data line after a preset time of outputting the detection voltage, and determine a threshold voltage of the driving transistor based on the detected voltage; and outputting a data voltage to the data line in a data writing phase, wherein the data voltage is related to the threshold voltage of the driving transistor. The display device provided by the embodiment of the invention can accurately detect the threshold voltage of the driving transistor, simplifies the mode of obtaining the threshold voltage, realizes the threshold voltage compensation of the driving transistor and improves the display effect.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display device and a driving method thereof.
Background
With the development of display technology, the application of display devices is becoming more and more extensive, and accordingly, the requirements for the display effect of display devices are becoming higher and higher.
The display device uses organic materials to make light emitting devices, and thin film transistors to construct pixel circuits. Due to the reasons of the process, the material and the like, the problem of threshold deviation exists in the formation of the thin film transistor, so that different thin film transistors generate different currents to drive the light emitting device to emit light under the condition that the driving voltage of the display device is the same, and the display effect is poor. The prior art usually adopts the internal pixel compensation method to add more thin film transistors in the pixel circuit, and the threshold compensation is realized by eliminating the threshold voltage in the current formula of the driving transistor after writing data.
However, the conventional display device has poor compensation effect when performing threshold voltage compensation, resulting in poor display effect.
Disclosure of Invention
Embodiments of the present invention provide a display device and a driving method thereof, so as to improve a threshold voltage compensation effect of the display device and improve a display effect.
In a first aspect, an embodiment of the present invention provides a display device, including a pixel circuit, where the pixel circuit includes a driving transistor;
a data line connected to the pixel circuit;
a display driver configured to output a detection voltage to the data line in a detection phase, detect a voltage on the data line after a preset time of outputting the detection voltage, and determine a threshold voltage of the driving transistor based on the detected voltage; and in a data writing phase, outputting a data voltage to the data line, wherein the output data voltage is related to the threshold voltage of the driving transistor.
Optionally, the display driver includes a driving unit, a potential detecting unit, a detected voltage output unit, a multiplexing unit, and a port connected to the data line;
the detection voltage output unit is used for outputting detection voltage;
the driving unit is used for outputting the data voltage; the potential detection unit is used for detecting the voltage on the data line and calculating the threshold voltage of the driving transistor;
the multi-path selection unit is used for gating any one of the driving unit, the potential detection unit and the detection voltage output unit and the port.
Optionally, the pixel circuit further includes a light emitting diode, the driving transistor and the light emitting diode are connected between a first power line and a second power line, a potential on the first power line is ELVDD, and a voltage output by the detection voltage output unit in a detection phase satisfies V1< ELVDD- | Vth |; v1 is the voltage outputted by the detection voltage output unit in the detection phase, and Vth is the threshold voltage of the driving transistor.
Optionally, the detection voltage output unit is further configured to output an initialization voltage to the data line in an initialization stage, where the initialization voltage is less than V1.
Optionally, the V1 is a positive voltage.
Optionally, the pixel circuit further comprises a light emitting diode, the driving transistor and the light emitting diode being connected between a first power line and a second power line;
in the detecting phase, the level ELVSS of the second power line is equal to the level ELVDD of the first power line.
Optionally, the pixel circuit further comprises a storage capacitor, a first switching transistor and a second switching transistor;
the first switch transistor is connected between the gate of the driving transistor and the data line, and the second switch transistor is connected between the second pole of the driving transistor and the data line;
the storage capacitor is connected between the first pole and the grid of the driving transistor, the first pole of the driving transistor is connected with the first power line, and the second pole of the driving transistor is connected with the second power line through the light-emitting diode.
Optionally, the pixel circuit further comprises a storage capacitor, a first switching transistor and a second switching transistor;
the first switch transistor is connected between the gate of the driving transistor and the data line;
the storage capacitor is connected between a first pole and a grid of the driving transistor, the first pole of the driving transistor is connected with a first power line, and a second pole of the driving transistor is connected with a second power line through the light-emitting diode;
the second switching transistor is connected between the gate and the second pole of the driving transistor.
Optionally, the data line outputs a data voltage Vdata + Vth, and the Vdata is a gray scale voltage.
In a second aspect, an embodiment of the present invention further provides a driving method of a display device, where the display device includes: a pixel circuit including a driving transistor; a data line connected to the pixel circuit; a display driver;
the driving method includes:
in a detection stage, the display driver outputs a detection voltage to the data line, detects the voltage on the data line after a preset time of outputting the detection voltage, and determines the threshold voltage of the driving transistor based on the detected voltage;
in a data write phase, the display driver outputs a data voltage to the data line, the data voltage being associated with a threshold voltage of the driving transistor.
The display device provided by the embodiment of the invention can accurately detect the threshold voltage of the driving transistor. In the data writing stage, the compensated data voltage can be written into the grid electrode of the driving transistor according to the determined threshold voltage, so that the compensation of the threshold voltage is realized, and the display effect of the display device is improved. In the detection stage, the display driver outputs detection voltage through the data line, the voltage on the data line is not controlled any more, and only the voltage on the acquisition data line is detected, so that the voltage between the grid electrode and the first electrode of the driving transistor at the moment of entering the pre-turn-off state is the threshold voltage of the driving transistor, and the threshold voltage acquisition mode is simplified.
Drawings
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 2 is a waveform diagram illustrating the control timing of the detection phase according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another display device according to an embodiment of the present invention;
FIG. 4 is a waveform diagram illustrating a control timing of a display phase according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another display device according to an embodiment of the invention;
fig. 6 is a flowchart of a driving method of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
An Organic Light Emitting Diode (OLED) display device uses Organic materials to manufacture Light Emitting devices, thin film transistors are used to construct pixel circuits, and the pixel circuits are arranged in an array manner and displayed in a line-by-line scanning and refreshing manner. Part of the thin film transistors in the pixel circuits operate in a linear region and act as switches, and the part of the transistors are also called switching transistors; and a part of the thin film transistor works in a saturation region and acts as a valve for voltage control current, and the part of the transistor is also called a driving transistor. The driving transistor works in a saturation region, the channel current of the driving transistor is equal to the light-emitting current of the OOLED light-emitting device, each current value corresponds to one pixel brightness, and the accurate control of the channel current of the driving transistor becomes the key for improving the display effect of the OLED display device. The thin film transistor is mostly made of polysilicon materials, because the polysilicon materials have a plurality of grain boundaries, the threshold voltage of the thin film transistor has deviation, and the threshold voltage influences the channel current of the thin film transistor, when the driving voltages are completely the same, because the deviation of the threshold voltage causes different pixel circuits to have different luminous currents, the problem of poor uniformity of the display device is caused, and the display effect is poor.
In view of this, the embodiments of the present invention propose the following solutions:
fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 1, a display device 10 includes: a pixel circuit PX including a driving transistor Tdrv; data lines (DL1 to DLj) connected to the pixel circuits PX; a display driver 200 configured to output a detection voltage to the data line in a detection phase, detect a voltage on the data line after a preset time of outputting the detection voltage, and determine a threshold voltage of the driving transistor Tdrv based on the detected voltage; and outputs a data voltage to the data line in a data writing stage, the output data voltage being associated with a threshold voltage of the driving transistor Tdrv.
Specifically, the display device 10 may include: a display panel 100; the liquid crystal display device comprises a plurality of scanning lines (GL 1-GLk) extending in a row direction, a plurality of data lines (DL 1-DLj) extending in a column direction and intersecting with scanning signal lines, wherein the scanning lines and the data lines intersect to form a plurality of pixel areas, a plurality of pixel circuits PX can be arranged in the pixel areas, when the scanning lines are sequentially selected, namely scanning pulses are output to the scanning lines, the pixel circuits PX in the rows connected with the scanning lines are selected and turned on, the turned-on pixel circuits PX can receive gray scale voltages transmitted by the data lines, and the pixel circuits PX can display corresponding gray scales according to the received gray scale voltages.
The plurality of scan lines may be electrically connected to the gate driver 300, and the gate driver 300 may be, for example, a plurality of cascaded shift registers, thereby supplying scan signals to the plurality of scan lines row by row to select the scan lines row by row. Illustratively, the pixel circuit PX may have a 3T1C structure, for example, the pixel circuit PX shown in fig. 1 includes 3 transistors (a first switching transistor T1, a second switching transistor T2, and a driving transistor Tdrv) and one storage capacitor C. When the scan line corresponding to the second switching transistor T2 is selected, the second switching transistor T2 is turned on, and the voltage on the data line initializes the light emitting diode OLED through the second switching transistor T2; when the scan line corresponding to the first switching transistor T1 outputs a scan signal, the first switching transistor T1 is turned on, the gray scale voltage on the data line is transmitted to the storage capacitor C, and the storage capacitor C stores the gray scale voltage, so that the driving transistor Tdrv can generate a stable driving current according to the gray scale voltage, and further drive the light emitting diode OLED to emit light.
In the embodiment of the present invention, the display device 10 includes a scan display stage and a detection stage, wherein the display stage is a process in which the display device 10 normally displays a picture, and the detection stage is a process in which the display driver 200 determines the threshold voltage of the driving transistor Tdrv. In the detection stage, the display driver outputs a detection voltage to the data line connected to the pixel circuit PX, and detects a voltage on the data line after a predetermined time of outputting the detection voltage. The detection voltage is used for ensuring that the driving transistor Tdrv is in a conducting state so as to determine the threshold voltage of the driving transistor Tdrv. After a preset time interval, determining the threshold voltage of the driving transistor Tdrv based on the detected voltage on the data line, wherein the preset time is the time length from the conducting state to the pre-turn-off state of the driving transistor Tdrv, and the pre-turn-off state is the critical state in which the driving transistor Tdrv is just turned off under the action of the driving voltage. The display driver 200 outputs a data voltage associated with the threshold voltage of the driving transistor Tdrv to the data line in a data writing phase of the display phase after determining the threshold voltage of the driving transistor Tdrv, to achieve a threshold compensation effect on the driving transistor Tdrv. Moreover, the number of transistors in the pixel circuit can be reduced by means of external compensation, for example, only three transistors are required in the pixel circuit in fig. 1. The data lines are multiplexed to detect the threshold voltage of the driving transistor, and the number of wires on the display device can be reduced.
As an optional implementation manner of the embodiment of the present invention, the detection voltage may be generated internally by the display driver 200, or may be provided by an external circuit, and the detection voltage provided by the external circuit is output to the data line through the display driver.
Optionally, fig. 2 is a waveform diagram of a control timing of the detection stage according to an embodiment of the present invention. Referring to fig. 1 and 2, the detection phase may be divided into three phases, namely a pre-charge phase t1, a threshold voltage obtaining phase t2 and a sampling phase t 3.
In the precharge stage T1, the display driver 200 outputs the detection voltage to the data line, and the Scan signals Scan1 and Scan2 inputted to the gates of the first switch transistor T1 and the second switch transistor T2 are both at a low level, so that the first switch transistor T1 and the second switch transistor T2 are in a conducting state, and the detection voltage on the data line is written into the gate of the driving transistor Tdrv. After the predetermined time t1, the threshold voltage obtaining stage t2 is entered, and the display driver 200 does not output the detection voltage to the data line any more, so the voltage Vdata on the data line is not controlled by the detection voltage any more. In the threshold voltage obtaining phase T2, the first switch transistor T1 and the second switch transistor T2 are still in an on state, the power supply voltage ELVDD charges the gate of the driving transistor Tdrv through the second switch transistor T2 and the first switch transistor T1, the gate potential of the driving transistor Tdrv gradually increases, as the gate potential of the driving transistor Tdrv gradually increases, the voltage difference between the gate and the first pole of the driving transistor Tdrv gradually decreases, so that the channel current gradually decreases, after a time period T2, the channel current of the driving transistor Tdrv gradually decreases to zero, the driving transistor Tdrv is in a pre-off state, and the voltage between the gate and the first pole of the driving transistor Tdrv at this time, that is, the threshold voltage Vth.
And a sampling period t3, during which the driving transistor Tdrv is already in an off state, and the gate potential of the driving transistor Tdrv is ELVDD + Vth due to the storage capacitor C. The display driver 200 samples the voltage on the data line with Vsen. The voltage of the gate of the driving transistor Tdrv is sampled and converted by the sampling voltage Vsen, and the sampling voltage Vsen is different from the voltage ELVDD on the first power line, so that the threshold voltage of the driving transistor Tdrv, that is, Vth-vsed, can be obtained.
In the display device provided by the embodiment of the invention, in the detection stage, the display driver outputs the detection voltage to the data line, and the grid electrode of the driving transistor Tdrv is precharged under the action of the detection voltage. After the preset time, the display driver 200 stops outputting the detection voltage, and detects the voltage on the data line, the power supply voltage ELVDD charges the gate of the driving transistor Tdrv through the second switching transistor T2 and the first switching transistor T1, the gate potential of the driving transistor Tdrv gradually increases, and as the gate potential of the driving transistor Tdrv gradually increases, the voltage difference between the gate and the first pole of the driving transistor Tdrv gradually decreases, so that the channel current gradually decreases. When the channel current is reduced to zero, the driving transistor Tdrv is in a pre-off state, and the voltage on the data line detected by the display driver 200 is the threshold voltage Vth of the driving transistor Tdrv at this time. In the data writing stage, the display driver 200 writes the determined threshold voltage and the data voltage into the gate of the driving transistor after being associated, in other words, the driver 200 outputs the compensated data voltage according to the determined threshold voltage of the driving transistor, so as to realize the compensation of the threshold voltage of the driving transistor, avoid the problem that different pixel circuits generate different light-emitting currents when the driving voltages are the same, so as to cause uneven brightness of the display device, and further improve the display effect of the display device. On the other hand, compared with the prior art, in the detection stage, the display driver 200 outputs the detection voltage through the data line, and does not control the voltage on the data line any more, but only detects the voltage on the collected data line, so that the voltage between the gate and the first electrode of the driving transistor at the moment of entering the pre-off state is the threshold voltage of the driving transistor, and the threshold voltage obtaining mode is simplified.
Optionally, fig. 3 is a schematic structural diagram of another display device provided in an embodiment of the present invention. Referring to fig. 1 and fig. 3, on the basis of the above embodiments, the display driver 200 according to the embodiment of the present invention includes a driving unit 2001, a potential detecting unit 2002, a detected voltage output unit 2003, a multiplexing unit 2004, and a port 2005 for connecting data lines; the detection voltage output unit 2003 is used for outputting a detection voltage; the driving unit 2001 is used to output a data voltage; the voltage detecting unit 2002 is configured to detect a voltage on the data line and calculate a threshold voltage of the driving transistor Tdrv; the multiplexing unit 2004 is configured to gate any one of the driving unit 2001, the potential detecting unit 2002, and the detection voltage outputting unit 2003 and the port 2005.
Specifically, the driving unit 2001 may be a driving chip, and is configured to generate a data voltage signal and write the data voltage signal into the gate of the driving transistor Tdrv in a data writing phase, so as to control the driving transistor Tdrv to generate a driving current, thereby lighting the light emitting diode OLED. The detection voltage output unit 2003 is configured to output a detection voltage to the data line connected to the pixel circuit PX in the detection phase, so as to ensure that the driving transistor Tdrv is in a conducting state, and thus, the threshold voltage of the driving transistor Tdrv is determined. The potential detecting unit 2002 is configured to detect a voltage on the data line after the detection voltage outputting unit 2003 outputs the detection voltage to the data line connected to the pixel circuit PX for a preset time, and determine a threshold voltage of the driving transistor Tdrv according to the detected voltage. The multiplexing unit 2004 may gate any one of the driving unit 2001, the potential detecting unit 2002, and the detection voltage outputting unit 2003 and the port 2005 according to a control timing. Illustratively, the first selection unit MUX1 in the multi-path selection unit 2004 is turned on, the driving unit 2001 is gated with the port 2005, the driving unit 2001 can output a data voltage to the data line, and the control transistor Tdrv generates a driving current under the action of the data voltage and the power voltage, thereby lighting the light emitting diode OLED. When the third selection unit MUX3 is turned on, the first selection unit MUX1 is turned off, the detection voltage output unit 2003 and the port 2005 are gated, the detection voltage output unit 2003 outputs a detection voltage to the data line, the driving transistor Tdrv is kept in a conducting state under the action of the detection voltage, and when the third selection unit MUX3 is turned off, the gate voltage of the driving transistor Tdrv is kept due to the existence of the storage capacitor C, and the driving transistor Tdrv is still conducted. Meanwhile, the second routing unit MUX2 is turned on, the detection voltage no longer controls the voltage level of the data line, and the voltage level detection unit 2002 collects the voltage on the data line and determines the threshold voltage of the driving transistor Tdrv according to the collected voltage. In the data writing stage, the data voltage associated with the threshold voltage of the driving transistor Tdrv is written into the gate of the driving transistor Tdrv, and the written data voltage is the voltage compensated by the threshold voltage, so that under the condition that the driving voltages are the same, different pixels can have the same current through threshold voltage compensation, and the display effect of the display device is improved. And the number of transistors in the pixel circuit PX is not increased, which is beneficial to the use of a high-resolution display device.
As an alternative implementation manner of the embodiment of the present invention, with reference to fig. 3, the embodiment takes a pixel circuit connected to a first data line as an example for description. The pixel circuit PX includes a driving transistor Tdrv, which is a P-type tube. The pixel circuit PX further includes a storage capacitor C, a first switching transistor T1, and a second switching transistor T2; the first switching transistor T1 is connected between the gate of the driving transistor Tdrv and the data line, and the second switching transistor T2 is connected between the second pole of the driving transistor Tdrv and the data line; the storage capacitor C is connected between a first electrode and a gate electrode of the driving transistor Tdrv, the first electrode of the driving transistor Tdrv is connected to a first power line, and a second electrode of the driving transistor Tdrv is connected to a second power line through the light emitting diode OLED.
Specifically, the potential on the first power line is ELVDD for providing a power voltage to the driving transistor Tdrv, the potential on the second power line is ELVSS for providing a low potential to the light emitting diode OLED, and the driving transistor Tdrv is turned on under the action of the gate driving voltage and the power voltage, outputs a channel current, and drives the light emitting diode OLED to emit light. The transistors in the pixel circuit PX are P-type LTPS transistors, which are turned on when the driving signal is at a low level and turned off when the driving signal is at a high level, and the threshold voltage is a negative value. According to the structure shown in fig. 3, the pixel circuit PX has a 3T1C structure, and the first switching transistor T1 and the second switching transistor T2 are both connected to the data line DL1, so that the data line DL1 can drive both the display and the potential detection paths.
Optionally, the pixel circuit PX further includes a light emitting diode OLED, the driving transistor Tdrv and the light emitting diode OLED are connected between a first power line and a second power line, a potential on the first power line is ELVDD, and the voltage output by the detection voltage output unit 2003 in the detection phase satisfies V1< ELVDD- | Vth |; v1 is the voltage outputted by the detection voltage output unit 2003 in the detection phase, and Vth is the threshold voltage of the driving transistor Tdrv.
For example, referring to fig. 2 and 3, the detection phase may be divided into three phases, namely a pre-charge phase t1, a threshold voltage obtaining phase t2 and a sampling phase t 3. During the entire detection phase, the first way select unit MUX1 in the display driver 200 always receives a low level, so the first way select unit MUX1 is in the OFF state.
In the precharge stage t1, the second selecting unit MUX2 is in an off state, the third selecting unit MUX3 is in an on state, and the detection voltage output unit 2003 outputs the voltage V1 to the data line DL 1. Since the scan signals inputted from the first and second switching transistors T1 and T2 are both low level during the precharge phase T1, the first and second switching transistors T1 and T2 are in a conductive state. And the voltage V1 on the data line DL1 is written into the gate and the second pole of the driving transistor Tdrv. Before entering the detection phase, the circuit characteristic of the pixel circuit PX is monitored to determine the approximate value of the threshold voltage Vth of the driving transistor Tdrv, and the voltage V1 output by the detection voltage output unit 2003 in the detection phase is set to V1< ELVDD- | Vth |, so as to ensure that the driving transistor Tdrv is in a conducting state at the end of the pre-charging phase t1, which is beneficial to the next phase.
The threshold voltage obtaining stage t2 is a stage in which the third selecting unit MUX3 is turned off when the input voltage is low, and the voltage V1 output by the detection voltage output unit 2003 does not control the voltage on the data line DL1 any more. The second select unit MUX2 inputs high level to turn on, and the voltage detecting unit 2002 will obtain the voltage on the data line DL 1. In the threshold voltage obtaining phase T2, the first switch transistor T1 and the second switch transistor T2 are still in the on state, and since the driving transistor Tdrv is in the on state and the light emitting diode OLED is in the off state at the end of the pre-charging phase T1, the current input from the first power line flows from the first pole to the second pole of the driving transistor Tdrv and charges the gate of the driving transistor Tdrv through the second switch transistor T2 and the first switch transistor T1, and the gate potential of the driving transistor Tdrv gradually increases. With the gradual increase of the gate potential of the driving transistor Tdrv, the voltage difference between the gate and the first pole of the driving transistor Tdrv is gradually reduced, so that the channel current (flowing from the first pole to the second pole of the driving transistor Tdrv) is gradually reduced, after a preset time, when the channel current of the driving transistor Tdrv is gradually reduced to zero, the driving transistor Tdrv is in a preset turn-off state, and the size of the preset time is determined, where the preset time is the duration of the threshold voltage obtaining stage t 2. For example, the duration of the threshold voltage obtaining phase t2 can be determined through a lot of experiments, so that at the end of the threshold voltage obtaining phase t2, the driving transistor Tdrv is in a pre-off state, and the voltage between the gate and the first pole of the driving transistor Tdrv at this time is obtained, i.e. the threshold voltage Vth.
As an alternative implementation manner of the embodiment of the invention, in the detection phase, the potential on the second power line is equal to the potential on the first power line. The second power line is typically connected to the cathode of the light emitting diode OLED for providing the potential required by the cathode. In the embodiment of the invention, the level ELVSS of the second power line is equal to the level ELVDD of the first power line during the detection phase. For example, the switching of the electric potential ELVSS is realized by providing the switch control circuit, and the electric potential ELVSS is switched to the electric potential ELVDD, so that the light emitting diode OLED is reversely biased and is in an off state, that is, in a detection stage, the light emitting diode OLED is not turned on, and no leakage current occurs, and thus, no shunt occurs at the second pole of the driving transistor Tdrv, and the charging process of the gate of the driving transistor Tdr is accelerated.
Optionally, V1 is a positive voltage. The advantage of this arrangement is that the voltage V1 output by the detection voltage output unit in the detection phase is set to be a positive voltage, so that the voltage written into the gate of the driving transistor Tdrv in the pre-charge phase t1 is a positive voltage, and after entering the threshold voltage obtaining phase t2, the voltage of the gate of the driving transistor Tdrv can be quickly raised to a required voltage, so as to reduce the duration of the threshold voltage obtaining phase t2, which is beneficial to optimizing the threshold voltage obtaining phase t 2. And the accuracy of obtaining the threshold voltage Vth of the driving transistor Tdrv can be ensured by optimizing the duration of the threshold voltage obtaining stage t 2.
And a sampling period t3, during which the driving transistor Tdrv is already in an off state, and the gate potential of the driving transistor Tdrv is ELVDD + Vth due to the storage capacitor C. The display driver 200 internally generates a sampling signal SMP to sample a voltage on the data line, the sampled voltage being Vsen. The voltage of the gate of the driving transistor Tdrv is sampled and converted by the sampling voltage Vsen, and the sampling voltage Vsen is different from the voltage ELVDD on the first power line, so that the threshold voltage of the driving transistor Tdrv, that is, Vth-vsed, can be obtained.
In the embodiment of the present invention, the threshold voltage of the driving transistor Tdrv of each pixel can be obtained in the above manner, and the threshold voltage of the driving transistor Tdrv is stored in the display driver 200 for compensation display, so as to improve the display uniformity and improve the display effect.
After the threshold voltage Vth of the driving transistor Tdrv is acquired in the detection phase, the threshold voltage Vth needs to be compensated to the gate of the driving transistor Tdrv, so that the threshold voltage Vth compensation can be realized in the display phase. Fig. 4 is a waveform diagram of a control timing sequence of a display stage according to an embodiment of the present invention, referring to fig. 3 and fig. 4, in the display stage, the second routing unit MUX2 always inputs a low level and is in an off state, that is, the electric potential detecting unit 2002 does not work when the display device performs displaying.
The display device provided by the embodiment of the invention further comprises a display stage, wherein the display stage can be divided into three stages, namely an initialization stage T11, a data writing stage T22 and a light emitting stage T33.
Referring to fig. 4, the initialization stage T11, the third selection unit MUX3 inputs a high level and is turned on, and the Scan signal Scan2 input by the second switch transistor T2 is a low level, the second switch transistor T2 is turned on, and the detection voltage output unit 2003 is further configured to output an initialization voltage to the data line DL1 during the initialization stage T11, where the initialization voltage is less than V1, and the initialization voltage is equal to ELVSS on the second power line and is a negative value. The detection voltage output unit 2003 writes an initialization voltage into the anode of the light emitting diode OLED to initialize the light emitting diode OLED.
In the data writing phase T22, the third selecting unit MUX3 is turned off, the first selecting unit MUX1 is turned on, the first switching transistor T1 in the pixel circuit PX is turned on, the second switching transistor T2 is turned off, the driving unit 2001 outputs the gray scale voltage Vdata to the data line DL1, and writes the gray scale voltage Vdata to the gate of the driving transistor Tdrv through the first switching transistor T1, since the threshold voltage Vth of the driving transistor Tdrv is already obtained in the detection phase, the data voltage output from the data line DL1 is Vdata + Vth in the data writing phase T22. In the data writing stage T22, after the third selecting unit MUX in the initialization stage T11 is turned off, the first selecting unit MUX1 is turned on after a certain delay time, so as to avoid that the first selecting unit MUX1 is turned on when the third selecting unit MUX is not completely turned off, thereby resulting in incomplete or inaccurate data voltage writing.
In the light emitting period T33, the Scan signals Scan1 and Scan2 inputted from the first switch transistor T1 and the second switch transistor T2 are both at a high level, and the first switch transistor T1 and the second switch transistor T2 are in an off state. The storage capacitor C keeps the grid potential of the driving transistor Tdrv at Vdata + Vth, so that the threshold voltage compensation effect is realized, and the light emitting diode OLED emits light normally.
In the embodiment of the invention, the gate potential at the pre-turn-off time of the driving transistor Tdrv is obtained in the detection stage, and the voltage on the data line DL1 is sampled and converted at the pre-turn-off time to obtain the threshold voltage Vth of the driving transistor Tdrv, so that the threshold voltage Vth of the driving transistor Tdrv is compensated in the data writing stage, and the display uniformity of the display panel is improved. In the detection stage, the switch control circuit is arranged to change the electric potential ELVSS on the second power line into the electric potential ELVDD on the first power line, and the light emitting diode OLED is reversely biased to ensure that no leakage current occurs, so that the problem that the threshold voltage Vth of the driving transistor Tdrv is not accurately obtained can be solved, and the display effect can be improved.
Optionally, fig. 5 is a schematic structural diagram of another display device provided in an embodiment of the present invention. As another implementation manner of the embodiment of the present invention, the space occupied by the routing lines can be reduced by optimizing the routing lines in the pixel circuits. Referring to fig. 5, the pixel circuit PX further includes a storage capacitor C, a first switching transistor T1, and a second switching transistor T2;
the first switching transistor T1 is connected between the gate of the driving transistor Tdrv and the data line DL 1;
the storage capacitor C is connected between a first pole and a grid of the driving transistor Tdrv, the first pole of the driving transistor Tdrv is connected with a first power line, and a second pole of the driving transistor Tdrv is connected with a second power line through the light-emitting diode OLED;
the second switching transistor Tdrv is connected between the gate and the second pole of the driving transistor Tdrv.
The display device provided in the embodiment of the invention only changes the connection manner of the second switching transistor T2 in the pixel circuit PX, and the other structures are not changed, and the operation principle thereof is the same as that provided in the above embodiment, and therefore, no further description is given here, and the display device has the beneficial effects provided in the above embodiment.
In addition, an embodiment of the present invention further provides a driving method of a display device, where the display device includes: a pixel circuit including a driving transistor; a data line connected to the pixel circuit; a display driver. Fig. 6 is a flowchart of a driving method of a display device according to an embodiment of the present invention, and referring to fig. 6, the driving method of the display device according to the embodiment of the present invention includes:
step 110, in the detection phase, the display driver outputs a detection voltage to the data line, detects a voltage on the data line after a preset time of outputting the detection voltage, and determines a threshold voltage of the driving transistor based on the detected voltage.
Specifically, referring to fig. 1 and fig. 2, the detecting process stage is a process of determining the threshold voltage of the driving transistor Tdrv by the display driver 200. In the detection stage, the display driver outputs a detection voltage to the data line connected to the pixel circuit PX, and detects a voltage on the data line after a predetermined time of outputting the detection voltage. The detection voltage is used for ensuring that the driving transistor Tdrv is in a conducting state so as to determine the threshold voltage of the driving transistor Tdrv. After a preset time interval, determining the threshold voltage of the driving transistor Tdrv based on the detected voltage on the data line, wherein the preset time is the time length from the conducting state to the pre-turn-off state of the driving transistor Tdrv, and the pre-turn-off state is the critical state in which the driving transistor Tdrv is just turned off under the action of the driving voltage. The display driver 200 outputs a data voltage associated with the threshold voltage of the driving transistor Tdrv to the data line in a data writing phase of the display process phase after determining the threshold voltage of the driving transistor Tdrv, to achieve a threshold compensation effect on the driving transistor Tdrv.
The detection phase can be divided into three phases, namely a pre-charge phase t1, a threshold voltage obtaining phase t2 and a sampling phase t 3.
In the precharge stage T1, the display driver 200 outputs the detection voltage to the data line, and the Scan signals Scan1 and Scan2 inputted by the first switch transistor T1 and the second switch transistor T2 are both low level, so that the first switch transistor T1 and the second switch transistor T2 are in a conducting state, and the detection voltage on the data line is written into the gate of the driving transistor Tdrv. After the predetermined time t1, the threshold voltage obtaining stage t2 is entered, and the display driver 200 does not output the detection voltage to the data line any more, so the voltage Vdata on the data line is not controlled by the detection voltage any more. In the threshold voltage obtaining phase T2, the first switch transistor T1 and the second switch transistor T2 are still in an on state, the power supply voltage ELVDD charges the gate of the driving transistor Tdrv through the second switch transistor T2 and the first switch transistor T1, the gate potential of the driving transistor Tdrv gradually increases, as the gate potential of the driving transistor Tdrv gradually increases, the voltage difference between the gate and the first pole of the driving transistor Tdrv gradually decreases, so that the channel current gradually decreases, after a time period T2, the channel current of the driving transistor Tdrv gradually decreases to zero, the driving transistor Tdrv is in a pre-off state, and the voltage between the gate and the first pole of the driving transistor Tdrv at this time, that is, the threshold voltage Vth. And a sampling period t3, during which the driving transistor Tdrv is already in an off state, and the gate potential of the driving transistor Tdrv is ELVDD + Vth due to the storage capacitor C. The display driver 200 internally generates a sampling signal SMP to sample a voltage on the data line, the sampled voltage being Vsen. The voltage of the gate of the driving transistor Tdrv is sampled and converted by the sampling voltage Vsen, and the sampling voltage Vsen is different from the voltage ELVDD on the first power line, so that the threshold voltage of the driving transistor Tdrv, that is, Vth-vsed, can be obtained. In the detection phase, the display driver 200 does not control the voltage on the data line any more, but only detects the voltage on the collected data line, so that the voltage between the gate and the first electrode of the driving transistor Tdrv at the moment of entering the pre-off state is the threshold voltage Vth of the driving transistor Tdrv, and the manner of obtaining the threshold voltage Vth is simplified.
In the data writing phase, the display driver outputs a data voltage to the data line, where the data voltage is associated with the threshold voltage of the driving transistor, step 120.
Illustratively, the pixel circuit PX may have a 3T1C structure, for example, the pixel circuit PX shown in fig. 1 includes 3 transistors (a first switching transistor T1, a second switching transistor T2, and a driving transistor Tdrv) and one storage capacitor C. When the scan line corresponding to the second switching transistor T2 is selected, the second switching transistor T2 is turned on, and the voltage on the data line initializes the light emitting diode OLED through the second switching transistor T2; in the data writing phase, the display driver 200 outputs the gray scale voltage Vdata to the data line, when the scan signal output by the scan line corresponding to the first switching transistor T1 is at a low level, the first switching transistor T1 is turned on, the display driver 200 writes the voltage Vdata on the data line into the gate of the driving transistor Tdrv through the first switching transistor T1, and since the threshold voltage Vth of the driving transistor Tdrv is already obtained in the detection phase, the data voltage output by the data line is Vdata + Vth in the data writing phase. The data voltage Vdata + Vth output by the data line is transmitted to the storage capacitor C, and the storage capacitor C stores the data voltage Vdata + Vth, so that the driving transistor Tdrv can generate stable driving current according to the data voltage Vdata + Vth, and further drives the light emitting diode OLED to emit light, the compensation effect of threshold voltage is realized, the problem that the brightness of the display device is uneven due to the fact that different pixels have different light emitting currents when the driving voltages are the same is solved, and the display effect of the display device is improved.
The driving method provided by the embodiment of the invention is used for driving the display device provided by the embodiment of the invention, so that the driving method provided by the embodiment of the invention has the beneficial effects described in the embodiment.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A display device, comprising:
a pixel circuit including a driving transistor;
a data line connected to the pixel circuit;
a display driver configured to output a detection voltage to the data line in a detection phase, detect a voltage on the data line after a preset time of outputting the detection voltage, and determine a threshold voltage of the driving transistor based on the detected voltage; and in a data write phase, outputting a data voltage to the data line, the data voltage being associated with a threshold voltage of the drive transistor.
2. The display device according to claim 1, wherein the display driver includes a driving unit, a potential detecting unit, a detected voltage output unit, a multiplexing unit, and a port connected to the data line;
the detection voltage output unit is used for outputting detection voltage;
the driving unit is used for outputting the data voltage; the potential detection unit is used for detecting the voltage on the data line and calculating the threshold voltage of the driving transistor;
the multi-path selection unit is used for gating any one of the driving unit, the potential detection unit and the detection voltage output unit and the port.
3. The display device according to claim 2, wherein the pixel circuit further comprises a light emitting diode, the driving transistor and the light emitting diode are connected between a first power line and a second power line, a potential on the first power line is ELVDD, and the voltage output by the detection voltage output unit in the detection phase satisfies V1< ELVDD- | Vth |; v1 is the voltage outputted by the detection voltage output unit in the detection phase, and Vth is the threshold voltage of the driving transistor.
4. The display device according to claim 3, wherein the detection voltage output unit is further configured to output an initialization voltage to the data line in an initialization phase, wherein the initialization voltage is less than the V1.
5. The display device according to claim 3, wherein the V1 is a positive voltage.
6. The display device according to claim 1, wherein the pixel circuit further comprises a light emitting diode, the driving transistor and the light emitting diode being connected between a first power supply line and a second power supply line;
in the detecting phase, the level ELVSS of the second power line is equal to the level ELVDD of the first power line.
7. The display device according to claim 6, wherein the pixel circuit further comprises a storage capacitor, a first switching transistor, and a second switching transistor;
the first switch transistor is connected between the gate of the driving transistor and the data line, and the second switch transistor is connected between the second pole of the driving transistor and the data line;
the storage capacitor is connected between the first pole and the grid of the driving transistor, the first pole of the driving transistor is connected with the first power line, and the second pole of the driving transistor is connected with the second power line through the light-emitting diode.
8. The display device according to claim 6, wherein the pixel circuit further comprises a storage capacitor, a first switching transistor, and a second switching transistor;
the first switch transistor is connected between the gate of the driving transistor and the data line;
the storage capacitor is connected between a first pole and a grid of the driving transistor, the first pole of the driving transistor is connected with a first power line, and a second pole of the driving transistor is connected with a second power line through the light-emitting diode;
the second switching transistor is connected between the gate and the second pole of the driving transistor.
9. The display device according to claim 1, wherein the data line outputs a data voltage Vdata + Vth during a data writing phase, and the Vdata is a gray scale voltage.
10. A driving method of a display device, the display device comprising: a pixel circuit including a driving transistor; a data line connected to the pixel circuit; a display driver;
the driving method includes:
in a detection stage, the display driver outputs a detection voltage to the data line, detects the voltage on the data line after a preset time of outputting the detection voltage, and determines the threshold voltage of the driving transistor based on the detected voltage;
in a data write phase, the display driver outputs a data voltage to the data line, the data voltage being associated with a threshold voltage of the driving transistor.
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