CN108269525B - AMOLED display device and driving method thereof - Google Patents
AMOLED display device and driving method thereof Download PDFInfo
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- CN108269525B CN108269525B CN201710003233.0A CN201710003233A CN108269525B CN 108269525 B CN108269525 B CN 108269525B CN 201710003233 A CN201710003233 A CN 201710003233A CN 108269525 B CN108269525 B CN 108269525B
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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
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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Abstract
The invention discloses an AMOLED display device and a driving method thereof, wherein the driving method of the AMOLED display device comprises the following steps: the scanning period of each whole row of pixel units comprises a first time period and a second time period; respectively sending data signals to the whole row of pixel units in a first time period, detecting the total current flowing through each driving transistor of the whole row of pixel units at the moment, comparing the detected total current with the corresponding reference current, and generating a voltage compensation value of the data signals according to the comparison result; and in a second time period, compensating each data signal according to the voltage compensation value, and sending the compensated data signals to the whole row of pixel units again so as to drive the organic light-emitting diode to emit light. According to the invention, a feedback unit feeds back proper compensation voltage to the data driver to control a whole row of pixel units to perform transverse mura compensation, so that the transverse mura problem is solved, and uneven brightness display is avoided.
Description
Technical Field
The invention relates to the technical field of display, in particular to an AMOLED display device and a driving method thereof.
Background
An Organic Light-Emitting Diode (OLED) display device is an active Light-Emitting device, has the advantages of high contrast, wide viewing angle, low power consumption, fast response speed, thinner volume and the like, and is expected to become the next-generation mainstream flat panel display technology.
OLED display devices can be classified into two main categories according to driving methods: a passive matrix type OLED display device (PMOLED) and an active matrix type OLED display device (AMOLED). The AMOLED display device has pixel units arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used as a large-sized display device with high definition.
The AMOLED display device comprises a plurality of pixel units which are arranged in an array mode, each pixel unit comprises an Organic Light Emitting Diode (OLED) and a driving transistor (Driver TFT) for driving the OLED to emit light, the magnitude of current flowing through the driving transistor can be changed by changing the magnitude of a data signal Vdata provided by a data line, and then the light emitting brightness of the OLED is controlled, so that different gray scale display is achieved.
In manufacturing the semiconductor layer of the driving transistor, amorphous silicon is generally formed first, and then the amorphous silicon is converted into a polysilicon layer by a laser scanning method such as Excimer Laser Annealing (ELA). The non-uniformity of the laser scanning may cause the grain sizes of the polysilicon gates of the driving transistors to be different, which may cause non-uniformity of characteristics of the driving transistors, such as threshold voltage, mobility, etc., thereby affecting lateral mura (i.e., ela-mura), which affects the display effect.
Disclosure of Invention
The invention aims to provide an AMOLED display device and a driving method thereof, and aims to solve the problem that the display effect of the conventional AMOLED display device is influenced by transverse mura.
The invention provides an AMOLED display device, which comprises a scanning driver, a data driver and a plurality of pixel units defined by scanning lines and data lines, wherein each pixel unit comprises an organic light emitting diode and a driving transistor, the AMOLED display device also comprises a feedback unit, the feedback unit comprises a current detection module, a storage module, a comparison module and a Gamma correction module, and the AMOLED display device comprises:
the current detection module is used for detecting the total current flowing through each driving transistor of a whole row of pixel units when the data driver respectively sends out data signals to the whole row of pixel units;
the storage module stores different Gamma curve and reference current relation data;
the comparison module is used for comparing the detected total current with the corresponding reference current in the storage module;
the Gamma correction module is used for generating a voltage compensation value of the data signal according to the comparison result and feeding the voltage compensation value back to the data driver;
the data driver compensates each data signal according to the voltage compensation value and sends the compensated data signals to the whole row of pixel units again.
Further, the driving transistor is a first transistor, each pixel unit further includes a second transistor and a third transistor, a first electrode of the third transistor is connected to a first power supply voltage, a second electrode of the third transistor is connected to the first electrode of the first transistor, a gate electrode of the third transistor is connected to an emission signal line, a gate electrode of the second transistor is connected to a scan line for supplying a scan signal, a first electrode of the second transistor is connected to a data line for supplying a data signal, a second electrode of the second transistor is connected to the gate electrode of the first transistor, a second electrode of the first transistor is connected to an anode of the organic light emitting diode, and a cathode of the organic light emitting diode is connected to a second power supply voltage.
Furthermore, the feedback unit is connected with a current detection line, the current detection line is connected with the current detection module and the first electrode of the first transistor of each pixel unit, and the current detection module carries out current detection through the current detection line.
Furthermore, the feedback unit is further connected with a feedback control line, the feedback unit further comprises a switch control module, each pixel unit further comprises a fourth transistor, the feedback control line is connected with the switch control module and the grid electrode of the fourth transistor of each pixel unit, the first electrode of the fourth transistor is connected with the anode of the organic light emitting diode, the second electrode of the fourth transistor is connected with the cathode of the organic light emitting diode, and the switch control module controls the fourth transistor to be turned on through the feedback control line in a current detection stage.
Furthermore, the feedback unit is further connected with a correction output line, the correction output line is connected with the Gamma correction module and the data driver, and the Gamma correction module outputs the voltage compensation value to the data driver through the correction output line.
Furthermore, the AMOLED display device further includes a plurality of fifth transistors, each fifth transistor corresponds to an entire row of pixel units, the feedback control line is further connected to a gate of each fifth transistor, a first electrode of each fifth transistor is connected to the current detection line, a second electrode of each fifth transistor is connected to a first electrode of the first transistor of each pixel unit in the corresponding entire row of pixel units, the feedback unit further includes a power module, the power module is configured to output the first power voltage through the current detection line in a current detection stage, and the switch control module further controls the fifth transistor to be turned on through the feedback control line in a current detection stage.
Furthermore, the feedback unit further comprises an analog-to-digital conversion module and a digital-to-analog conversion module, wherein the analog-to-digital conversion module is used for converting the current analog signal detected by the current detection module into a digital signal, and the digital-to-analog conversion module is used for converting the digital Gamma correction signal generated by the Gamma correction module into an analog voltage compensation value and feeding back the analog voltage compensation value to the data driver.
The invention also provides a driving method of the AMOLED display device, which comprises the following steps:
the scanning period of each whole row of pixel units comprises a first time period and a second time period, wherein:
respectively sending data signals to the whole row of pixel units in a first time period, detecting the total current flowing through each driving transistor of the whole row of pixel units at the moment, comparing the detected total current with the corresponding reference current, and generating a voltage compensation value of the data signals according to the comparison result;
and in a second time period, compensating each data signal according to the voltage compensation value, and sending the compensated data signals to the whole row of pixel units again so as to drive the organic light-emitting diode to emit light.
Further, each pixel unit includes a first transistor, a second transistor, and a third transistor, the driving transistor is the first transistor, a first electrode of the third transistor is connected to a first power voltage, a second electrode of the third transistor is connected to the first electrode of the first transistor, a gate electrode of the third transistor is connected to an emission signal line, a gate electrode of the second transistor is connected to a scan line supplying a scan signal, a first electrode of the second transistor is connected to a data line supplying a data signal, a second electrode of the second transistor is connected to the gate electrode of the first transistor, a second electrode of the first transistor is connected to an anode of the organic light emitting diode, and a cathode of the organic light emitting diode is connected to a second power voltage.
Further, in a first period of time, the emission signal line controls the third transistor to be turned on or off, and the scan line controls the second transistor to be turned on; in a second time period, the emission signal line controls the third transistor to be turned on, and the scanning line controls the second transistor to be turned on.
According to the AMOLED display device and the driving method thereof provided by the embodiment, the feedback unit is used for comparing the relation between a large number of Gamma curves tested in advance and reference current, the current flowing through the driving transistor can be enabled to be equal to the current corresponding to the required brightness when the grid voltage of the driving transistor is calculated, the corrected Gamma value is generated, appropriate compensation voltage is fed back to the data driver, and the whole row of pixel units are controlled to perform transverse mura compensation, so that the transverse mura problem is solved through feedback compensation, and the uneven brightness display is avoided.
Drawings
Fig. 1 is a schematic circuit diagram of an AMOLED display device according to a first embodiment of the invention.
Fig. 2 is a schematic diagram of a circuit structure in each pixel unit in fig. 1.
Fig. 3 is a schematic structural diagram of the feedback unit in fig. 1.
FIG. 4 is a schematic diagram of the driving timing sequence for compensating for the lateral mura in FIG. 1.
Fig. 5 is a schematic circuit diagram of an AMOLED display device according to a second embodiment of the invention.
Fig. 6 is a schematic diagram of a circuit structure in each pixel unit in fig. 5.
Fig. 7 is a schematic structural diagram of the feedback unit in fig. 5.
FIG. 8 is a schematic diagram of the driving timing sequence for compensating for the lateral mura in FIG. 5.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the present invention will be made with reference to the accompanying drawings and examples.
[ first embodiment ]
Referring to fig. 1, which is a schematic circuit diagram of an AMOLED display device according to a first embodiment of the present invention, the AMOLED display device of the present embodiment includes a scan driver 30, a data driver 40, and a plurality of pixel units 20 defined by scan lines Sn and data lines Dm; the plurality of pixel units 20 are arranged in an array, each pixel unit 20 is connected to the scan driver 30 through a scan line Sn and an emission signal line EMn, and each pixel unit 20 is connected to the data driver 40 through a data line Dm.
Wherein the scan driver 30 generates scan signals Vscan and emission control signals, the scan signals Vscan being sequentially supplied to the pixel unit 20 through the scan lines Sn, respectively, and the emission control signals being sequentially supplied to the pixel unit 20 through the emission signal lines EMn, respectively; the data driver 40 generates a data signal Vdata corresponding to the image data and supplies the data signal Vdata to the pixel unit 20 through the data line Dm in synchronization with the scan signal Vscan.
In fig. 1, the scan line Sn and the emission signal line EMn are both illustrated as being connected to the scan driver 30, but in practice, the scan line Sn may be connected to the scan driver 30, and the emission signal line EMn may be connected to an emission driver (not shown), that is, the scan line Sn and the emission signal line EMn are connected to different drivers.
Referring to fig. 1 and 2, the AMOLED display device needs two power supplies Vdd and Vss for lighting, wherein the first power supply voltage Vdd is higher than the second power supply voltage Vss, each pixel unit 20 includes an Organic Light Emitting Diode (OLED) and a driving transistor (Driver TFT), wherein the driving transistor is the first transistor T1 in fig. 2, the luminance of the OLED is controlled by the current passing through the OLED, and the voltage difference between the first power supply voltage Vdd provided by the power chip (not shown) and the data signal Vdata provided by the data line Dm determines the magnitude of the driving current passing through the OLED.
In FIG. 2, a schematic circuit structure of the ith (1 ≦ i ≦ n) pixel cell 20 is illustrated, and each pixel cell 20 further includes a second transistor T2, a third transistor T3, and a storage capacitor C. A first electrode of the third transistor T3 is connected to a first power voltage Vdd, a second electrode of the third transistor T3 is connected to a first electrode of the first transistor T1, a gate of the third transistor T3 is connected to the emission signal line EMn, a gate of the second transistor T2 is connected to the scan line Sn to which the scan signal Vscan is supplied, a first electrode of the second transistor T2 is connected to the data line Dm to which the data signal Vdata is supplied, a second electrode of the second transistor T2 is connected to the gate of the first transistor T1, a second electrode of the first transistor T1 is connected to an anode of the OLED, a cathode of the OLED is connected to the second power voltage Vss, one end of the storage capacitor C is connected to the gate of the first transistor T1, and the other end of the storage capacitor C is connected to the second electrode of the first transistor T1. The second transistor T2 is a switching transistor controlled by a scan signal Vscan provided by the scan line Sn.
In fig. 2, for the sake of intuition, a label of "1" on one side of each transistor represents a first electrode, and a label of "2" on the other side of each transistor represents a second electrode. The first electrode is a source electrode, and the second electrode is a drain electrode; or the first electrode is a drain electrode, and the second electrode is a source electrode.
The transistors used in this embodiment may all be thin film transistors or field effect transistors. The transistors used in this embodiment are all P-type transistors, and in fact, each transistor may also be an N-type transistor. In the following description, each transistor is a P-type transistor.
As shown in fig. 1 to 3, the AMOLED display device further includes a feedback unit 50, the feedback unit 50 includes a current detection module 51, a storage module 52, a comparison module 53 and a Gamma correction module 54, wherein:
the current detecting module 51 is configured to detect a total current flowing through each driving transistor of an entire row of pixel units when the data driver 40 sends a data signal to the entire row of pixel units respectively;
the storage module 52 stores different Gamma curves and relation data of the reference current;
the comparing module 53 is configured to compare the detected total current with a corresponding reference current in the storage module 52;
the Gamma correction module 54 is configured to generate a voltage compensation value △ Vdata of the data signal according to the comparison result, and feed back the voltage compensation value △ Vdata to the data driver 40;
the data driver 40 compensates each data signal according to the voltage compensation value △ Vdata, and re-sends the compensated data signals to the pixel units in the whole row.
Assuming that the data line D1 inputs the data signal Vdata _1 to the first pixel cell 20 in a whole row of pixel cells, the current flowing through the driving transistor in the first pixel cell 20 is I1(ii) a The data line D2 inputs the data signal Vdata _2 to the second pixel cell 20 in a whole row of pixel cells, and the current flowing through the driving transistor in the second pixel cell 20 is I2(ii) a In this way, the data line Dm inputs the data signal Vdata _ m to the mth pixel unit 20 in the whole row of pixel units, and the current flowing through the driving transistor in the mth pixel unit 20 is Im(ii) a The total current I' through the individual drive transistors of a full row of pixel cells is I1+I2+…+Im。
When the data driver 40 compensates each data signal according to the voltage compensation value △ Vdata, the voltage compensation value △ Vdata is superimposed on the original data signals Vdata _1, Vdata _2, …, Vdata _ m, respectively, to obtain compensated data signals (Vdata _1+ △ Vdata), (Vdata _2+ △ Vdata), …, (Vdata _ m + △ Vdata), and the compensated data signals are re-sent to each pixel unit 20 of the whole row through the data lines D1, D2, …, and Dm, respectively, to drive the OLED of each pixel unit 20 to emit light, thereby realizing the lateral mura compensation of the pixel units of the whole row.
The feedback unit 50 is connected to a current detection line 61, the current detection line 61 is connected to the current detection module 51 and the first electrode of the first transistor T1 of each pixel unit 20, and the current detection module 51 performs current detection through the current detection line 61.
The feedback unit 50 is further connected to a feedback control line 62, the feedback unit 50 further includes a switch control module 55, each pixel unit 20 further includes a fourth transistor T4, the feedback control line 62 is connected to the switch control module 55 and the gate of the fourth transistor T4 of each pixel unit 20, a first electrode of the fourth transistor T4 is connected to the anode of the OLED, a second electrode of the fourth transistor T4 is connected to the cathode of the OLED, and the switch control module 55 controls the fourth transistor T4 to be turned on through the feedback control line 62 in the current detection phase.
The feedback unit 50 is further connected to a correction output line 63, the correction output line 63 is connected to the Gamma correction module 54 and the data driver 40, and the Gamma correction module 54 outputs the voltage compensation value △ Vdata to the data driver 40 through the correction output line 63.
The feedback unit 50 further includes an analog-to-digital conversion module 56, the analog-to-digital conversion module 56 is connected to the output end of the current detection module 51 and receives the current analog signal output by the current detection module 51, and the analog-to-digital conversion module 56 is configured to convert the current analog signal detected by the current detection module 51 into a digital signal and output the digital signal to the comparison module 53.
The feedback unit 50 further includes a digital-to-analog conversion module 57, the digital-to-analog conversion module 57 is connected to the output end of the Gamma correction module 54, and receives the digital Gamma correction signal output by the Gamma correction module 54, and the digital-to-analog conversion module 57 is configured to convert the digital Gamma correction signal generated by the Gamma correction module 54 into an analog voltage compensation value △ Vdata and feed back the analog voltage compensation value △ Vdata to the data driver 40.
That is, the current detection module 51 is used for detecting the total current flowing through each driving transistor in a whole row of pixel units during the current detection stage, the analog-to-digital conversion module 56 is used for converting the current analog signal detected by the current detection module 51 into a digital signal, the storage module 52 is used for storing a large amount of Gamma curve and reference current relationship data, the comparison module 53 is used for comparing the magnitude relationship between the detected total current and the corresponding reference current, the Gamma correction module 54 is used for generating a corrected Gamma value according to the comparison result, and the digital-to-analog conversion module 57 is used for converting the corrected digital Gamma signal into an analog voltage signal (i.e. a voltage compensation value △ Vdata) and feeding the analog voltage signal back to the data driver 40 for compensation.
In the AMOLED display device provided in this embodiment, when each entire row of pixel cells is scanned and displayed, the total current flowing through each driving transistor of the entire row of pixel cells is detected by the feedback unit 50, and compared with the corresponding reference current, the voltage compensation value △ Vdata for correction is generated and fed back to the data driver 40, so as to compensate each data signal applied to the entire row of pixel cells by the data line, thereby solving the problem of lateral mura.
Referring to fig. 1 to 4, the present embodiment further provides a driving method of an AMOLED display device, including the steps of:
the scanning period of each entire row of pixel units 20 includes a first time period t1 and a second time period t2, wherein:
in a first time period t1, respectively sending data signals to the whole row of pixel units, detecting the total current flowing through each driving transistor of the whole row of pixel units, comparing the detected total current with the corresponding reference current, and generating a voltage compensation value △ Vdata of the data signals according to the comparison result;
in the second time period t2, each data signal is compensated according to the voltage compensation value △ Vdata, and the compensated data signals are sent to the whole row of pixel units again to drive the organic light emitting diode to emit light.
The first time period t1 is a current detection period, and the second time period t2 is a light emitting period.
As shown in fig. 1 and 2, for each pixel unit 20 in an entire row of pixel units, the scan signal Vscan is supplied to the second transistor T2 of each pixel unit 20 through the scan line Sn, the emission control signal is supplied to the third transistor T3 of each pixel unit 20 through the emission signal line EMn, and the switching control signal is supplied to the fourth transistor T4 of each pixel unit 20 through the feedback control line 62.
Specifically, as shown in fig. 4, during the first time period T1, the emission signal line EMn, the scan line Sn, and the feedback control line 62 (denoted by "FB" in fig. 4) all output low levels, the emission signal line EMn controls the third transistor T3 to be turned on, the scan line Sn controls the second transistor T2 to be turned on, each data signal Vdata is written into the gate of each driving transistor (i.e., the first transistor T1) of a whole row of pixel units respectively during the first time period T1 through the data line Dm, and a current flows through the driving transistor (i.e., the first transistor T1) under the effect of a voltage difference between the power voltage Vdd and the data signal Vdata, at this time, the total current flowing through each driving transistor of the whole row of pixel units is detected by the current detection module 51 of the feedback unit 50.
The storage module 52 of the feedback unit 50 stores a large amount of data of the relationship between the Gamma curve and the reference current, and since the current flowing through the driving transistor and the light emitting luminance of the OLED have a linear relationship, the data signal Vdata controls the light emitting luminance of the OLED by controlling the current flowing through the driving transistor (the Gamma curve reflects the relationship between the luminance and the gray scale, which is 256 gray scales, and the gray scale from 0 to 255 corresponds to the variation range of the data signal Vdata), the data signal Vdata and the current flowing through the driving transistor can be given by a large amount of test data in the early stage, and the data corresponding relationship between the current flowing through the driving transistor and the light emitting luminance of the OLED can be given by a large amount of test data.
After detecting the total current flowing through each driving transistor of the pixel unit of the whole row, the detected total current is compared with the corresponding reference current in the memory module 52, and a voltage compensation value of the data signal is generated according to the comparison result, for example, if the detected current I '< I (I' is the detected current and I is the corresponding reference current), the brightness Lv '< Lv needs to be increased from I' to I by decreasing the data signal Vdata (note that the driving transistor is a P-type tube, and the data signals Vdata and I are negative logic relationships), so as to make the OLED brightness reach the required value, and specifically, how much the value of the data signal Vdata needs to be decreased can be determined according to a large amount of data tested before, therefore, the detected total current is compared with the corresponding reference current in the memory module 52 by the comparison module 53, the comparison result is transmitted to the Gamma correction module 54, and the Gamma correction module 54 can generate a voltage compensation value △ of the data signal Vdata according to the comparison result.
In a second time period T2, the emission signal line EMn and the scan line Sn both output a low level, the feedback control line FB outputs a high level, the emission signal line EMn controls the third transistor T3 to be turned on, the scan line Sn controls the second transistor T2 to be turned on, the data driver 40 compensates each data signal according to the voltage compensation value △ Vdata output by the feedback unit 50, and then sends out the compensated data signals to the pixel units of the whole row again, and the compensated data signals are written into the gates of the driving transistors of the pixel units of the whole row respectively, so as to drive the organic light emitting diodes to emit light.
During the first period T1, the feedback control line FB outputs a low level and controls the fourth transistor T4 to turn on, thereby avoiding lighting the OLED during the current detecting phase.
Further, the scanning period of each whole row of pixel units 20 further includes a third time period T3 between the first time period T1 and the second time period T2, and in the third time period T3, the emission signal line EMn, the scanning line Sn, and the feedback control line FB all output a high level, the emission signal line EMn controls the third transistor T3 to turn off, the scanning line Sn controls the second transistor T2 to turn off, and the feedback control line FB controls the fourth transistor T4 to turn off, that is, all the transistors are in a turned-off state, so that the detection current period T1 and the light emitting period T2 can be separated, and crosstalk between the two periods can be prevented.
[ second embodiment ]
Fig. 5 to 8 illustrate a second embodiment of the present invention, which is different from the first embodiment mainly in that in the present embodiment, the AMOLED display device further includes a plurality of fifth transistors T5, each fifth transistor T5 corresponds to an entire row of pixel units 20, the feedback control line 62 is further connected to a gate of each fifth transistor T5, a first electrode of each fifth transistor T5 is connected to the current detection line 61, a second electrode of each fifth transistor T5 is connected to a first electrode of the first transistor T1 of each pixel unit 20 in the corresponding entire row of pixel units 20, the feedback unit 50 further includes a power module 58, the power module 58 is configured to output a first power voltage Vdd through the current detection line 61 in the current detection phase, and the switch control module 55 further controls the fifth transistor T5 to be turned on through the feedback control line 62 in the current detection phase.
As shown in fig. 8, in the first time period T1 for current detection, the emission signal line EMn outputs a high level, the scan line Sn and the feedback control line FB both output a low level, the emission signal line EMn controls the third transistor T3 to be turned off, the scan line Sn controls the second transistor T2 to be turned on, but the feedback control line FB controls the fourth transistor T4 and the fifth transistor T5 to be turned on, at this time, the first power supply voltage Vdd is supplied from the power module 58 of the feedback unit 50 through the current detection line 61, the first power supply voltage Vdd supplied from the power module 58 is applied to the first electrode of the driving transistor (i.e., the first transistor T1) through the turned-on fifth transistor T5, and a current is made to flow through the driving transistor, instead of the scheme in which the first power supply voltage Vdd is applied to the first electrode of the driving transistor (i.e., the first transistor T1) through the turned-on third transistor T3 in the first.
In the second period T2 in which the OLED emits light, the emission signal line EMn and the scan line Sn both output a low level, the feedback control line FB outputs a high level, the emission signal line EMn controls the third transistor T3 to be turned on, the scan line Sn controls the second transistor T2 to be turned on, and the feedback control line FB controls the fourth transistor T4 and the fifth transistor T5 to be turned off.
In this embodiment, other structures and driving principles of the AMOLED display device can be seen from the first embodiment, which is not described herein again.
The AMOLED display device and the driving method thereof according to the above embodiments compare the relationship between a large number of Gamma curves and reference currents tested in advance through the feedback unit 50, calculate the gate voltage of the driving transistor to make the current flowing through the driving transistor equal to the current corresponding to the required brightness, generate a corrected Gamma value, and feed back a proper compensation voltage to the data driver 40 to control the pixel unit 20 of an entire row to perform the lateral mura compensation, thereby solving the lateral mura problem through the feedback compensation and avoiding the uneven brightness display.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. An AMOLED display device comprises a scanning driver, a data driver and a plurality of pixel units defined by scanning lines and data lines, wherein each pixel unit comprises an organic light emitting diode and a driving transistor, and the AMOLED display device is characterized by further comprising a feedback unit, wherein the feedback unit comprises a current detection module, a storage module, a comparison module, a Gamma correction module, an analog-to-digital conversion module and a digital-to-analog conversion module, and the AMOLED display device comprises:
the current detection module is connected with a first electrode of a first transistor of each pixel unit through a current detection line and is used for detecting the total current flowing through each driving transistor of a whole row of pixel units when the data driver respectively sends out data signals to the whole row of pixel units;
the analog-to-digital conversion module is connected with the current detection module and is used for converting the current analog signal detected by the current detection module into a digital signal;
the storage module stores different Gamma curve and reference current relation data;
the comparison module is used for comparing the detected total current with the corresponding reference current in the storage module;
the Gamma correction module is connected with the comparison module and used for generating a digital Gamma correction signal according to the comparison result and the relation data of different Gamma curves and reference current;
the digital-to-analog conversion module is connected with the Gamma correction module, is connected with the data driver through a correction output line, and is used for converting a digital Gamma correction signal generated by the Gamma correction module into an analog voltage compensation value and feeding back the analog voltage compensation value to the data driver;
the data driver compensates each data signal according to the analog voltage compensation value and sends the compensated data signals to the whole row of pixel units again.
2. The AMOLED display device of claim 1, wherein the driving transistor is a first transistor, each pixel cell further comprises a second transistor and a third transistor, a first electrode of the third transistor is connected to a first power voltage, a second electrode of the third transistor is connected to a first electrode of the first transistor, a gate electrode of the third transistor is connected to an emission signal line, a gate electrode of the second transistor is connected to a scan line for supplying a scan signal, a first electrode of the second transistor is connected to a data line for supplying a data signal, a second electrode of the second transistor is connected to a gate electrode of the first transistor, a second electrode of the first transistor is connected to an anode of the organic light emitting diode, and a cathode of the organic light emitting diode is connected to a second power voltage.
3. The AMOLED display device as claimed in claim 2, wherein the feedback unit further comprises a feedback control line, the feedback unit further comprises a switch control module, each pixel unit further comprises a fourth transistor, the feedback control line is connected to the switch control module and the gate of the fourth transistor of each pixel unit, the first electrode of the fourth transistor is connected to the anode of the OLED, the second electrode of the fourth transistor is connected to the cathode of the OLED, and the switch control module controls the fourth transistor to turn on through the feedback control line during the current sensing phase.
4. The AMOLED display device as claimed in claim 3, further comprising a plurality of fifth transistors, each of the fifth transistors corresponding to an entire row of pixel cells, the feedback control line further connected to a gate of each of the fifth transistors, a first electrode of each of the fifth transistors connected to the current detection line, a second electrode of each of the fifth transistors connected to a first electrode of the first transistor of each of the pixel cells in the corresponding entire row of pixel cells, the feedback unit further comprising a power module for outputting the first power voltage through the current detection line during a current detection phase, the switch control module further controlling the fifth transistors to be turned on through the feedback control line during a current detection phase.
5. A method for driving an AMOLED display device as claimed in any one of claims 1 to 4, comprising the steps of:
the scanning period of each whole row of pixel units comprises a first time period and a second time period, wherein:
respectively sending data signals to the whole row of pixel units in a first time period, detecting the total current flowing through each driving transistor of the whole row of pixel units at the moment, comparing the detected total current with the corresponding reference current, and generating an analog voltage compensation value of the data signals according to the comparison result and the relation data of different Gamma curves and the reference current;
and in a second time period, compensating each data signal according to the analog voltage compensation value, and sending the compensated data signals to the whole row of pixel units again so as to drive the organic light-emitting diode to emit light.
6. The driving method of an AMOLED display device according to claim 5, wherein each pixel cell includes a first transistor, a second transistor, and a third transistor, the driving transistor is the first transistor, a first electrode of the third transistor is connected to a first power supply voltage, a second electrode of the third transistor is connected to a first electrode of the first transistor, a gate electrode of the third transistor is connected to an emission signal line, a gate electrode of the second transistor is connected to a scan line supplying a scan signal, a first electrode of the second transistor is connected to a data line supplying a data signal, a second electrode of the second transistor is connected to a gate electrode of the first transistor, a second electrode of the first transistor is connected to an anode of the organic light emitting diode, a cathode of the organic light emitting diode is connected to a second power supply voltage, wherein, in the first period, the emission signal line controls the third transistor to be turned on or turned off, and the scanning line controls the second transistor to be turned on; in a second time period, the emission signal line controls the third transistor to be turned on, and the scanning line controls the second transistor to be turned on.
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| KR102131265B1 (en) * | 2018-10-18 | 2020-07-07 | 주식회사 사피엔반도체 | Micro Display and Test Method thereof |
| KR102281948B1 (en) * | 2018-10-18 | 2021-07-27 | 주식회사 사피엔반도체 | Micro Display and Test Method thereof |
| CN109614014B (en) * | 2019-02-12 | 2022-04-19 | 合肥京东方光电科技有限公司 | Driving method of pixel unit, touch display and touch display driving circuit |
| CN110956920A (en) * | 2019-12-24 | 2020-04-03 | 武汉天马微电子有限公司 | Display device and driving method thereof |
| CN110956928B (en) * | 2019-12-25 | 2021-04-30 | 厦门天马微电子有限公司 | Organic light emitting display device and driving method thereof |
| CN111583862B (en) * | 2020-05-19 | 2022-07-12 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit and OLED display panel |
| CN114333672B (en) * | 2021-12-25 | 2024-04-09 | 重庆惠科金渝光电科技有限公司 | Driving circuit, driving method and display device of display panel |
| CN114927550B (en) * | 2022-05-26 | 2023-06-09 | 惠科股份有限公司 | Display panel and display device |
| CN115019735B (en) * | 2022-06-28 | 2023-12-26 | 惠科股份有限公司 | Pixel compensation method, pixel compensation device and display device |
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