CN109637458B - AMOLED panel and driving method - Google Patents

AMOLED panel and driving method Download PDF

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Publication number
CN109637458B
CN109637458B CN201910143079.6A CN201910143079A CN109637458B CN 109637458 B CN109637458 B CN 109637458B CN 201910143079 A CN201910143079 A CN 201910143079A CN 109637458 B CN109637458 B CN 109637458B
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panel
amoled
detection
pixel
scanning signal
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CN201910143079.6A
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Chinese (zh)
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CN109637458A (en
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黄泰钧
曾玉超
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深圳市华星光电半导体显示技术有限公司
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • G09G3/3225Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • G09G3/3266Details of drivers for scan electrodes

Abstract

The invention relates to an AMOLED panel and a driving method. The AMOLED panel includes: the pixel units are arranged in the panel effective display area in a display mode, each row of pixel units are connected with corresponding scanning lines, and each column of pixel units are connected with corresponding data lines and detection lines; each pixel unit comprises a corresponding AMOLED pixel driving circuit, a first scanning signal (WR) and a second scanning signal (RD) of the AMOLED pixel driving circuit contained in the pixel unit of the nth row in the panel are respectively a first scanning signal (WR (n)) and a second scanning signal (RD (n)) of the pixel unit of the nth row, and the second scanning signal (RD (n)) of the pixel unit of the nth row in the panel is short-circuited with the first scanning signal (WR (n +1)) of the pixel unit of the n +1 th row. The AMOLED pixel driving circuit can be driven in a single-gate mode, so that the cost of a gate driver or an array substrate row driving circuit can be reduced, and the aperture opening ratio of an AMOLED panel is improved.

Description

AMOLED panel and driving method

Technical Field

The invention relates to the technical field of display, in particular to an AMOLED panel and a driving method.

Background

Organic Light Emitting Diode (OLED) display devices have many advantages such as self-luminescence, low driving voltage, high luminous efficiency, short response time, and wide temperature range, and are considered to be the most promising display devices in the industry.

The OLED display panel may be classified into two broad categories, i.e., a Passive Matrix OLED (PMOLED) and an Active Matrix OLED (AMOLED), according to a driving manner. The AMOLED panel has pixels arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used for a large-sized display device with high definition.

Referring to fig. 1, a schematic diagram of a conventional AMOLED pixel driving circuit mainly includes: a first thin film transistor T1, a second thin film transistor T2 as a driving thin film transistor, a third thin film transistor T3, a first capacitor Cst, a second capacitor Csen, and an organic light emitting diode D1; the AMOLED pixel driving circuit is connected with the detection circuit through the detection line to achieve a detection function, the detection circuit obtains a detection voltage Vsamp from the AMOLED pixel driving circuit through the detection line, the detection circuit can be contained in the source driver, the threshold voltage Vth of the second thin film transistor T2 can be compensated by the detection voltage Vsamp, the uniformity and stability of the driving thin film transistor can affect the display effect due to the fact that the AMOLED panel is a current driving type display device, and the display quality can be improved by compensating the threshold voltage Vth of the second thin film transistor T2.

The gate electrode of the first thin film transistor T1 is connected to a first scan signal WR, the source electrode and the drain electrode are respectively connected to a Data signal Data and a first node g, and the first thin film transistor T1 transmits the Data signal Data to the gate electrode of the second thin film transistor T2 under the control of the first scan signal WR; a gate electrode of the second thin film transistor T2 is connected to the first node g, and a source electrode and a drain electrode are connected to the second node s and the power supply high voltage VDD, respectively; a gate of the third thin film transistor T3 is connected to the second scan signal RD, and a source and a drain are connected to the second node s and the sensing line, respectively; two ends of the first capacitor Cst are respectively connected with the first node g and the second node s; two ends of the second capacitor Csen are respectively connected with the detection line and the ground; the organic light emitting diode D1 has an anode connected to the second node s and a cathode connected to the power supply low voltage VSS.

The detection circuit mainly comprises a detection pin ADC and a reference voltage output end; the detection pin ADC is connected to the detection line through a first switch K1, the first switch K1 connects the detection pin ADC to the detection line under the control of the detection signal samp, so that the detection pin ADC can obtain a detection voltage Vsamp from the AMOLED pixel driving circuit through the detection line, and the detection pin ADC can be further connected to the analog-to-digital conversion circuit to convert the detection voltage Vsamp; the reference voltage output terminal is connected to the sensing line through a second switch K2, and the second switch K2 connects the reference voltage output terminal to the sensing line under the control of the control signal sen _ pre, so that the reference voltage output terminal can output the reference voltage Vref to the AMOLED pixel driving circuit through the sensing line for pre-charging.

An AMOLED panel including the conventional AMOLED pixel driving circuit generally employs a dual Gate (Two Gate) scan driving scheme, the first scan signal WR and the second scan signal RD are derived from Two separate Gate scan signals external to the AMOLED pixel driving circuit, and the Gate scan signals are generally derived from a Gate Driver (Gate Driver) or a Gate On Array (GOA) circuit external to the AMOLED pixel driving circuit.

Referring to fig. 2, a timing diagram of dual-gate scan driving of a conventional AMOLED panel can be understood in conjunction with fig. 1. CPV _ WR and DIO _ WR respectively represent a clock signal and a scan start signal for the first scan signal WR, which can be used to generate the first scan signal WR for each row of pixels on the panel; CPV _ RD and DIO _ RD respectively represent a clock signal and a scan start signal for the second scan signal RD, which can be used to generate the second scan signal RD for each row of pixels of the panel; WR (1) … … WR (n) respectively represents the first scanning signal WR for the nth row of pixels of row 1 … …; RD (1) … … RD (n) respectively represents the second scanning signals RD of the pixels of the nth row … … of the 1 st row; data represents Data signals, Line (1) … … Line (n) represents the delivery of Data signals to the Line 1 … … Line n pixels, respectively; sen _ pre represents a control signal of the second switch K2.

For a large-sized AMOLED panel, the two sets of gate scan signals may sacrifice a larger aperture ratio, and the two sets of gate scan signals may increase the cost of the gate driver or the row driver circuit of the array substrate.

Disclosure of Invention

Therefore, an object of the present invention is to provide an AMOLED panel and a driving method thereof, in which a single gate (OneGate) method is used to drive an AMOLED pixel driving circuit.

In order to achieve the above object, the present invention provides an AMOLED panel, including a plurality of pixel units arranged in a display area of the panel, each row of the pixel units being connected to a corresponding scan line, and each column of the pixel units being connected to a corresponding data line and a corresponding sense line; each pixel unit comprises a corresponding AMOLED pixel driving circuit respectively, and the AMOLED pixel driving circuit comprises:

a first thin film transistor, the grid electrode of which is connected with a first scanning signal, and the source electrode and the drain electrode of which are respectively connected with a data signal and a first node;

a second thin film transistor having a gate connected to the first node, and a source and a drain connected to the second node and a power supply high voltage, respectively;

a third thin film transistor, the grid of which is connected with the second scanning signal, and the source and the drain of which are respectively connected with the second node and the detection line;

a first capacitor, two ends of which are respectively connected with a first node and a second node;

the two ends of the second capacitor are respectively connected with the detection line and the ground;

an organic light emitting diode, the anode of which is connected with the second node and the cathode of which is connected with the low voltage of the power supply;

the first scanning signal and the second scanning signal of the AMOLED pixel driving circuit included in the pixel unit of the nth row in the panel are respectively the first scanning signal and the second scanning signal of the pixel unit of the nth row, and the second scanning signal of the pixel unit of the nth row in the panel is short-circuited with the first scanning signal of the pixel unit of the (n +1) th row.

When the panel is driven to display, assuming that a scanning time of each row of pixel units in a frame display time of the panel is t, in the AMOLED pixel driving circuit, a time that the first scanning signal continuously turns on the first thin film transistor is 2t, a time that the second scanning signal continuously turns on the third thin film transistor is 2t, and the first thin film transistor precedes the third thin film transistor in turn-on time t.

The first scanning signal of the pixel units in the nth row is from the gate scanning line in the nth row of the panel.

The detection circuit comprises a detection pin and a reference voltage output end; the detection pin is connected with the detection line through a first switch, and the first switch is used for connecting and conducting the detection pin and the detection line under the control of a detection signal, so that the detection pin obtains a detection voltage from the AMOLED pixel driving circuit through the detection line; the reference voltage output end is connected with the detection line through a second switch, and the second switch connects the reference voltage output end with the detection line under the control of the control signal, so that the reference voltage output end outputs reference voltage to the AMOLED pixel driving circuit through the detection line.

The detection pin is further connected with an analog-to-digital conversion circuit to convert the detection voltage.

Wherein the control signal is maintained at a high voltage for one frame display time of the panel to turn on the second switch.

Wherein each pixel unit comprises four subpixels RGBW.

Wherein the data lines comprise RGBW four data lines.

The invention also provides a driving method of the AMOLED panel, which comprises the following steps: when the panel is driven to display, assuming that the scanning time of each row of pixel units in one frame display time of the panel is t, in the AMOLED pixel driving circuit, the time for the first scanning signal to continuously turn on the first thin film transistor is 2t, the time for the second scanning signal to continuously turn on the third thin film transistor is 2t, and the first thin film transistor precedes the third thin film transistor by the on-time t.

In summary, the AMOLED panel and the driving method of the invention can drive the AMOLED pixel driving circuit by using a single gate method, thereby reducing the cost of the gate driver or the array substrate row driving circuit and improving the aperture ratio of the AMOLED panel; the pixel pre-charging function can be realized by setting the driving time sequence, and the method can be applied to the drive of the AMOLED panel with large size and high resolution.

Drawings

The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.

In the drawings, there is shown in the drawings,

FIG. 1 is a schematic diagram of a conventional AMOLED pixel driving circuit;

fig. 2 is a timing diagram of dual-gate scanning driving of a conventional AMOLED panel;

FIG. 3 is a schematic diagram of a driving structure of an AMOLED panel according to a preferred embodiment of the present invention;

FIG. 4 is a timing diagram of single gate scan driving of the AMOLED panel according to a preferred embodiment of the present invention.

Detailed Description

Referring to fig. 3, a driving architecture of the AMOLED panel according to a preferred embodiment of the invention is shown. The AMOLED panel provided by the invention comprises a plurality of pixel units 1 which are arranged in a display manner in an effective display area of the panel, wherein each row of pixel units 1 is connected with corresponding scanning lines G (1) and G (2) … …, and each column of pixel units 1 is connected with corresponding data lines R, G, B, W and detection lines S; each pixel unit 1 includes a corresponding number of AMOLED pixel driving circuits, each of which can drive one sub-pixel, for example, for the pixel unit 1 having four sub-pixels of RGBW sub-pixels, the pixel unit 1 may include four AMOLED pixel driving circuits to respectively drive the RGBW sub-pixels, the pixel unit 1 in the nth row, that is, the plurality of AMOLED pixel driving circuits included in the pixel unit 1 in the nth row, may obtain corresponding gate scan signals from the gate driver or the array substrate row driving circuit through the nth row gate scan line g (n) of the connection panel, and may also be connected to the source driver through data lines such as the data line R, G, B and W to obtain corresponding data signals of the sub-pixels, or the detection circuit is connected with the detection line S to realize the detection function, and the detection circuit can be contained in the source driver; each pixel unit 1, that is, the AMOLED pixel driving circuit included in the pixel unit 1, further needs a corresponding first scan signal WR and a second scan signal RD, the first scan signal WR (n) of the nth row of pixel units 1 may be from the nth row of gate scan lines G (n) of the panel, and the second scan signal RD (n) of the nth row of pixel units 1 may be from the (n +1) th row of gate scan lines G (n +1) of the panel. The present invention is improved in that the second scan signal RD of the pixel unit 1 of each row, i.e., the AMOLED pixel driving circuit, is shorted with the first scan signal WR of the pixel unit 1 of the next row, i.e., the AMOLED pixel driving circuit, so that the same gate scan signal can be used to omit one gate scan signal.

Referring to fig. 4, a timing diagram of a single gate scan driving of an AMOLED panel according to a preferred embodiment of the invention is shown. When the pixel driven by the AMOLED pixel driving circuit in the panel is located at the nth row of the panel, the first scanning signal WR is the first scanning signal WR (n) of the pixel at the nth row, the second scanning signal RD is the second scanning signal RD (n) of the pixel at the nth row, and the second scanning signal RD (n) is short-circuited with the first scanning signal WR (n +1) of the pixel at the n +1 th row, that is, the two signals are the same. The invention can reduce a group of grid scanning signals of the panel by short-circuiting WR (n +1) and RD (n) together to form a signal; for example, in fig. 4, WR (2) is the same as RD (1), omitting the originally required RD (1) signal, and WR (2n +1) is the same as RD (2n), omitting the originally required RD (2n) signal. In fig. 4, CPV and DIO respectively represent a clock signal and a scan start signal, which can be used to generate a plurality of first scan signals WR and/or second scan signals RD; WR (1) … … WR (2n +1) indicates a first scanning signal WR for the 2n +1 th row pixels of Line 1 … …, RD (1) … … RD (2n) indicates a second scanning signal RD for the 2n th row pixels of Line 1 … …, Data indicates a Data signal, Line (1) … … Line (n) indicates a Data signal transmitted to the n th row pixels of Line 1 … …, and the Data signals are supplied to the corresponding sub-pixels from the Data lines in a progressive scanning manner when the panel is displayed; sen _ pre represents a control signal of the second switch K2: it can be seen that the number of signals in fig. 4 is significantly reduced compared to fig. 2.

In addition to the improvement of the present invention, the structure of the AMOLED pixel driving circuit according to the present invention can refer to fig. 1, and mainly includes: a first thin film transistor T1, a second thin film transistor T2 as a driving thin film transistor, a third thin film transistor T3, a first capacitor Cst, a second capacitor Csen, and an organic light emitting diode D1; the AMOLED pixel driving circuit is connected with the detection circuit through the detection line to realize a detection function, and the detection circuit obtains a detection voltage Vsamp from the AMOLED pixel driving circuit through the detection line. The gate electrode of the first thin film transistor T1 is connected to a first scan signal WR, the source electrode and the drain electrode are respectively connected to a Data signal Data and a first node g, and the first thin film transistor T1 transmits the Data signal Data to the gate electrode of the second thin film transistor T2 under the control of the first scan signal WR; a gate electrode of the second thin film transistor T2 is connected to the first node g, and a source electrode and a drain electrode are connected to the second node s and the power supply high voltage VDD, respectively; a gate of the third thin film transistor T3 is connected to the second scan signal RD, and a source and a drain are connected to the second node s and the sensing line, respectively; two ends of the first capacitor Cst are respectively connected with the first node g and the second node s; two ends of the second capacitor Csen are respectively connected with the detection line and the ground; the organic light emitting diode D1 has an anode connected to the second node s and a cathode connected to the power supply low voltage VSS.

The detection circuit can be included in a source driver, and mainly includes a detection pin ADC and a reference voltage output terminal, as shown in fig. 1; the detection pin ADC is connected to the detection line through a first switch K1, the first switch K1 connects the detection pin ADC to the detection line under the control of the detection signal samp, so that the detection pin ADC can obtain a detection voltage Vsamp from the AMOLED pixel driving circuit through the detection line, and the detection pin ADC can be further connected to the analog-to-digital conversion circuit to convert the detection voltage Vsamp; the reference voltage output terminal is connected to the sensing line through the second switch K2, and the second switch K2 connects the reference voltage output terminal to the sensing line under the control of the control signal sen _ pre, so that the reference voltage output terminal can output the reference voltage Vref to the AMOLED pixel driving circuit through the sensing line.

Further, as can be seen from the timing sequence of the signals in fig. 4, assuming that the scanning time of each row of pixel units within one frame display time of the panel is T, the time that the first scanning signal WR continuously turns on the first tft T1 is 2T, the time that the second scanning signal RD continuously turns on the third tft T3 is 2T, and the first tft T1 is turned on at the time T before the third tft T3; further, the control signal sen _ pre is maintained at a high voltage for one frame display time of the panel to open the second switch K2. Therefore, according to the timing sequence shown in fig. 4, in one frame time, the gate scan lines of the panel can be simultaneously turned on for 2 rows and scan line by line, each row of corresponding display data is output through the data lines, and the Vref voltage is output through the detection lines, so that pixel pre-charging can be realized, and the method is suitable for driving the large-size and high-resolution AMOLED panel.

Based on the AMOLED panel and the timing sequence shown in fig. 4, the invention further provides a driving method of the AMOELD panel, when the panel is driven to display, assuming that the scanning time of each row of pixel units within one frame of display time of the panel is T, in the AMOLED pixel driving circuit, the time for the first scanning signal WR to continuously turn on the first tft T1 is 2T, the time for the second scanning signal RD to continuously turn on the third tft T3 is 2T, and the first tft T1 is earlier than the third tft T3 by the turn-on time T; further, the control signal sen _ pre may be maintained at a high voltage for one frame display time of the panel to open the second switch K2 for the precharge.

In summary, the AMOLED panel and the driving method of the invention can drive the AMOLED pixel driving circuit by using a single gate method, thereby reducing the cost of the gate driver or the array substrate row driving circuit and improving the aperture ratio of the AMOLED panel; the pixel pre-charging function can be realized by setting the driving time sequence, and the method can be applied to the drive of the AMOLED panel with large size and high resolution.

As described above, it will be apparent to those skilled in the art that various other changes and modifications can be made based on the technical solution and the technical idea of the present invention, and all such changes and modifications should fall within the protective scope of the appended claims.

Claims (8)

1. An AMOLED panel, comprising: the pixel units are arranged in the panel effective display area in a display mode, each row of pixel units are connected with corresponding scanning lines, and each column of pixel units are connected with corresponding data lines and detection lines; each pixel unit comprises a corresponding AMOLED pixel driving circuit respectively, and the AMOLED pixel driving circuit comprises:
a first thin film transistor, the grid electrode of which is connected with a first scanning signal, and the source electrode and the drain electrode of which are respectively connected with a data signal and a first node;
a second thin film transistor having a gate connected to the first node, and a source and a drain connected to the second node and a power supply high voltage, respectively;
a third thin film transistor, the grid of which is connected with the second scanning signal, and the source and the drain of which are respectively connected with the second node and the detection line;
a first capacitor, two ends of which are respectively connected with a first node and a second node;
the two ends of the second capacitor are respectively connected with the detection line and the ground;
an organic light emitting diode, the anode of which is connected with the second node and the cathode of which is connected with the low voltage of the power supply;
the first scanning signal and the second scanning signal of the AMOLED pixel driving circuit contained in the pixel unit of the nth row in the panel are respectively the first scanning signal and the second scanning signal of the pixel unit of the nth row, and the second scanning signal of the pixel unit of the nth row in the panel is short-circuited with the first scanning signal of the pixel unit of the (n +1) th row;
when the panel is driven to display, assuming that the scanning time of each row of pixel units in one frame display time of the panel is t, in the AMOLED pixel driving circuit, the time for the first scanning signal to continuously turn on the first thin film transistor is 2t, the time for the second scanning signal to continuously turn on the third thin film transistor is 2t, and the first thin film transistor precedes the third thin film transistor by the on-time t.
2. The AMOLED panel of claim 1, wherein the first scan signal for the nth row of pixel cells is from an nth row gate scan line of the panel.
3. The AMOLED panel of claim 1, wherein the AMOLED pixel driving circuit is connected to a detection circuit through a detection line, the detection circuit comprising a detection pin and a reference voltage output terminal; the detection pin is connected with the detection line through a first switch, and the first switch is used for connecting and conducting the detection pin and the detection line under the control of a detection signal, so that the detection pin obtains a detection voltage from the AMOLED pixel driving circuit through the detection line; the reference voltage output end is connected with the detection line through a second switch, and the second switch connects the reference voltage output end with the detection line under the control of the control signal, so that the reference voltage output end outputs reference voltage to the AMOLED pixel driving circuit through the detection line.
4. The AMOLED panel of claim 3, wherein the detection pins are further connected with an analog-to-digital conversion circuit to convert detection voltages.
5. An AMOLED panel as claimed in claim 3, wherein the control signal is held at a high voltage to open the second switch for one frame of display time of the panel.
6. The AMOLED panel of claim 1, wherein each pixel cell includes four subpixels RGBW.
7. The AMOLED panel of claim 6, wherein the data lines include RGBW four data lines.
8. The AMOLED panel driving method as claimed in claim 1, wherein when the panel is driven to display, assuming that the scanning time of each row of pixel cells within one frame display time of the panel is t, in the AMOLED pixel driving circuit, the first scanning signal is continuously turned on for 2t, the second scanning signal is continuously turned on for 2t, and the first thin film transistor is turned on for a time t before the third thin film transistor.
CN201910143079.6A 2019-02-26 2019-02-26 AMOLED panel and driving method CN109637458B (en)

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