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CN109872694A - display panel - Google Patents

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Publication number
CN109872694A
CN109872694A CN201910256646.9A CN201910256646A CN109872694A CN 109872694 A CN109872694 A CN 109872694A CN 201910256646 A CN201910256646 A CN 201910256646A CN 109872694 A CN109872694 A CN 109872694A
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China
Prior art keywords
transistor
compensation
voltage level
capacitor
signal
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CN201910256646.9A
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CN109872694B (en
Inventor
陈奕冏
郑贸薰
黄正翰
张翔昇
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AUO Corp
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AU Optronics Corp
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Abstract

一种显示面板,包含电容、补偿电路、写入电路和驱动电路。电容包含第一端和第二端。补偿电路耦接电容的第一端,用以根据扫描信号将电容的第一端重置到参考电压电平,并根据发光控制信号接收系统高电压电平以输出补偿信号至电容的第一端。写入电路耦接电容的第二端,用以根据扫描信号选择性地导通以输出数据信号至电容的第二端。驱动电路耦接电容的第二端,用以根据发光控制信号选择性地导通以根据电容的第二端的电压电平以输出驱动电流至发光元件。

A display panel includes a capacitor, a compensation circuit, a writing circuit and a driving circuit. The capacitor includes a first terminal and a second terminal. The compensation circuit is coupled to the first end of the capacitor to reset the first end of the capacitor to a reference voltage level according to the scan signal, and to receive the system high voltage level according to the lighting control signal to output a compensation signal to the first end of the capacitor. . The writing circuit is coupled to the second end of the capacitor and is used to selectively conduct according to the scan signal to output the data signal to the second end of the capacitor. The driving circuit is coupled to the second terminal of the capacitor and is configured to selectively conduct according to the light-emitting control signal to output a driving current to the light-emitting element according to the voltage level of the second terminal of the capacitor.

Description

Display panel
Technical field
This disclosure relates to a kind of display panels, and in particular to a kind of display panel with compensation circuit.
Background technique
As the demand of numeric display unit increasingly increases, active organic light-emitting diode display device (Active Matrix Organic Light Emitting Display, AMOLED) it is widely used in various numbers because of its good characteristic In display device.
However, driving current is driven transistor in the operation of active organic light-emitting diode display device Critical voltage (threshold voltage) is influenced, and because the critical voltage of each driving transistor has error each other, is driven Therefore electric current can generate difference, and cause organic light-emitting diode brightness inconsistent, so that the picture when showing image Brightness disproportionation.
Summary of the invention
One aspect of present disclosure is related to a kind of display panel.Display panel includes capacitor, compensation circuit, write circuit And driving circuit.Capacitor includes first end and second end.The first end of compensation circuit coupling capacitance, to be incited somebody to action according to scanning signal The first end of capacitor is reset to reference voltage level, and receives system high voltage level according to LED control signal to export compensation Signal to capacitor first end.The second end of write circuit coupling capacitance, to be selectively turned on according to scanning signal with defeated Out data-signal to capacitor second end.The second end of driving circuit coupling capacitance, to according to LED control signal selectivity Ground conducting is with the voltage level according to the second end of capacitor with output driving current to light-emitting component.
Detailed description of the invention
Figure 1A is the schematic diagram that a kind of display panel is shown according to the section Example of present disclosure.
Figure 1B is the schematic diagram that another display panel is shown according to the section Example of present disclosure.
Fig. 2 is the signal sequence schematic diagram that a kind of pixel is shown according to the section Example of present disclosure.
Fig. 3 is that each crystal in the display panel of Figure 1A is shown within first period according to the section Example of present disclosure The status diagram of pipe.
Fig. 4 is that each crystal in the display panel of Figure 1A is shown within the second phase according to the section Example of present disclosure The status diagram of pipe.
Fig. 5 A is to exemplify the schematic diagram of another display panel according to the implementation of the other parts of present disclosure.
Fig. 5 B is to exemplify the schematic diagram of another display panel according to the implementation of the other parts of present disclosure.
Fig. 6 is to implement to exemplify the signal sequence signal of another display panel according to the other parts of present disclosure Figure.
Fig. 7 A, Fig. 7 B are to exemplify another display panel and its signal sequence according to the implementation of the other parts of present disclosure Schematic diagram.
Wherein, the reference numerals are as follows:
100: display panel
PI1, PI2, PI3: pixel
120: compensation circuit
140: write circuit
160: driving circuit
OLED: light-emitting component
TC1, TC2, TC3, TC4: compensation transistor
T1, T2, T3, T4: transistor
C1: capacitor
S1 [N], S1 [1], S1 [2], S1 [K]: scanning signal
EM [N], EM1 [N], EM2 [N], EM [G]: LED control signal
Vcomp [n]: thermal compensation signal
Vdata [m]: data-signal
Vref: reference voltage level
OVDD: system high voltage level
OVSS: system low-voltage level
P1, P2, Poff, Pon: period
Specific embodiment
It is hereafter to elaborate for embodiment cooperation attached drawing, but described specific embodiment is only to explain this public affairs It opens, is not used to limit the disclosure, and the description of structure operation is non-to limit its sequence executed, it is any by element again group The structure of conjunction, the produced device with impartial technical effect, is all the range that present disclosure is covered.
Please refer to Figure 1A.Figure 1A is the signal that a kind of display panel 100 is shown according to the section Example of present disclosure Figure.In some embodiments, display panel 100 can be active organic LED display panel (Active Matrix Organic Light Emitting Display, AMOLED).It may include that pixel is complete aobvious to form in display panel 100 Show picture, is illustrated in Figure 1A in order to illustrate upper one of pixel conduct that succinctly only shows.
As shown in Figure 1A, display panel 100 includes compensation circuit 120 and pixel PI1.Pixel PI1 includes write circuit 140, driving circuit 160, capacitor C1 and light-emitting component OLED.Compensation circuit 120 includes compensation transistor TC1, TC2 and TC3.It writes Entering circuit 140 includes transistor T1.Driving circuit 160 includes transistor T2 and T3.Capacitor C1 includes first end and second end.
In structure, the first end of 120 coupling capacitance C1 of compensation circuit.The second end of 140 coupling capacitance C1 of write circuit.It drives The second end and light-emitting component OLED of dynamic 160 coupling capacitance C1 of circuit.Specifically, the first end coupling of compensation transistor TC1 System high voltage level OVDD.Compensate the first end of the second end coupling compensation transistor TC2 of transistor TC1.Compensate transistor The second end of TC2 and the control terminal of compensation transistor TC2 are coupled together at the first end of capacitor C1.Compensate the of transistor TC3 One end is also coupled to the first end of capacitor C1.
The second end of the second end coupling capacitance C1 of transistor T1.The first end coupling system high-voltage level of transistor T2 OVDD.The second end of the control terminal coupling capacitance C1 of transistor T2.The first end of the second end coupling transistors T3 of transistor T2. The first end of the second end coupling light-emitting component OLED of transistor T3.The second end coupling system low-voltage electricity of light-emitting component OLED Flat OVSS.
In operation, compensation circuit 120 is to be reset to reference voltage for the first end of capacitor C1 according to scanning signal S1 [N] Level Vref, and system high voltage level OVDD is received to export thermal compensation signal Vcomp [n] according to LED control signal EM [N] To the first end of capacitor C1.Write circuit 140 is to be selectively connected according to scanning signal S1 [N] with outputting data signals The second end of Vdata [m] to capacitor C1.Driving circuit 160 is to selectively turn on according to LED control signal EM [N] with root According to the voltage level of the second end of capacitor C1 with output driving current I1 to light-emitting component OLED.
Specifically, the control terminal of compensation transistor TC1 is to receive LED control signal EM [N], and according to luminous control Signal EM [N] processed, which selectively turns on, to be received system high voltage level OVDD with the first end of self compensation transistor TC1 and passes through The second end of compensation transistor TC1 is exported to the first end of compensation transistor TC2.Compensation transistor TC2 is received to basis System high voltage level OVDD generate thermal compensation signal Vcomp [n], and by thermal compensation signal Vcomp [n] self compensation transistor TC2 Second end export to the first end of capacitor C1.
The first end of transistor TC3 is compensated to receive reference voltage level Vref.The control terminal for compensating transistor TC3 is used To receive scanning signal S1 [N], and selectively turned on according to scanning signal S1 [N] so that compensating the second of transistor TC3 End is reset to reference voltage level Vref.
The first end of transistor T1 in write circuit 140 is to receive data-signal Vdata [m].The control of transistor T1 End processed is selectively turned on to receive scanning signal S1 [N], and according to scanning signal S1 [N] to pass through the second of transistor T1 Hold outputting data signals Vdata [m] to the second end of capacitor C1.
The first end of transistor T2 in driving circuit 160 is to receive system high voltage level OVDD.Transistor T2 is used To be selectively turned on according to the voltage level of the control terminal of transistor T2, to pass through the second end output driving electricity of transistor T2 Flow I1.The first end of transistor T3 is to receive driving current I1 from the second end of transistor T2.The control terminal of transistor T3 is used To receive LED control signal EM [N], and selectively turned on according to LED control signal EM [N] by the of transistor T3 Two end output driving current I1 to light-emitting component OLED.
Please refer to Figure 1B.Figure 1B is to show showing for another display panel 100 according to the section Example of present disclosure It is intended to.As shown in Figure 1B, in other parts embodiment, two or more pixel PI1, PI2, PI3's in display panel 100 The first end of capacitor C1 is mutually coupled, to receive identical thermal compensation signal Vcomp [n].Pixel PI2 and PI3 can be by Figure 1A Shown pixel PI1 implementation, operating method is as described above, does not repeat then at this.
In other words, two or more pixel PI1, PI2, PI3 share the same compensation circuit 120.In this way, pass through benefit The one-to-many shared framework of circuit 120 is repaid, layout area can be reduced.Although in addition, shown in Figure 1B three pixel PI1, PI2, PI3, but its quantity only for convenience of description for the sake of example, not to limit present disclosure.This field has usual knowledge The pixel quantity that the same compensation circuit 120 is shared in display panel 100 can be arranged in person according to actual demand.
Please refer to Fig. 2.When Fig. 2 is the signal for showing a kind of display panel 100 according to the section Example of present disclosure Sequence schematic diagram.As shown in Fig. 2, scanning signal S1 [N] is in low voltage level in first period P1.In second phase P2, scanning letter Number S1 [N] is in high-voltage level.In addition, LED control signal EM [N] is located at shutdown voltage level in first period P1.? Two period P2, LED control signal EM [N] switch to luminous voltage level by shutdown voltage level.In other words, in section Example In, the time span that LED control signal EM [N] is located at shutdown voltage level is greater than or equal to the time span of first period P1.
For ease of illustration for the sake of, the concrete operations of each element will arrange in pairs or groups attached in following paragraphs in display panel 100 Figure is illustrated.Please also refer to Fig. 2 and Fig. 3.Fig. 3 is to be shown according to the section Example of present disclosure in first period P1 The status diagram of each transistor in the display panel 100 of interior Figure 1A.As shown in figure 3, in some embodiments, first period P1 Correspond to the resetting and address period of display panel 100.
In first period P1, to compensate transistor TC1, TC2 positioned at the LED control signal EM [N] of shutdown voltage level It is turned off with transistor T3.Make to compensate transistor TC3 and transistor T2 conducting positioned at the scanning signal S1 [N] of low voltage level. Specifically, in first period P1, compensation transistor TC3 is connected according to scanning signal S1 [N] with by the first end weight of capacitor C1 Set reference voltage level Vref.Transistor T2 is connected according to scanning signal S1 [N] to export extremely data-signal Vdata [m] The second end of capacitor C1.In other words, in first period P1, the first end of capacitor C1 is located at reference voltage level Vref, capacitor C1 Second end be located at the voltage level of data-signal Vdata [m].
Then, please also refer to Fig. 2 and Fig. 4.Fig. 4 is to be shown according to the section Example of present disclosure in the second phase In P2 in the display panel 100 of Figure 1A each transistor status diagram.As shown in figure 4, in some embodiments, the second phase P2 corresponds to the luminous period of display panel 100.
In second phase P2, make to compensate transistor TC3 and transistor T2 positioned at the scanning signal S1 [N] of high-voltage level Shutdown.Make to compensate transistor TC1, TC2 and transistor T3 conducting positioned at the LED control signal EM [N] of luminous voltage level. Specifically, compensation transistor TC1, TC2 is connected according to LED control signal EM [N], and according to system height in second phase P2 Voltage level OVDD generates thermal compensation signal Vcomp [n].Wherein, since the control terminal and second end of compensation transistor TC2 couple, Therefore the voltage level of the thermal compensation signal Vcomp [n] generated is that system high voltage level OVDD subtracts facing for compensation transistor TC2 Boundary's voltage.
Since the voltage level of the first end of capacitor C1 is to be changed into thermal compensation signal by reference voltage level Vref at this time The voltage level of Vcomp [n], therefore the voltage level of the second end of capacitor C1 is the voltage electricity by data-signal Vdata [m] Flat, the voltage level for being changed into data-signal Vdata [m] is subtracted again plus the voltage level of thermal compensation signal Vcomp [n] with reference to electricity Voltage level Vref.
In other words, the voltage level of the control terminal of transistor T2 at this time are as follows: Wherein VDATABe for the voltage level of data-signal Vdata [m],It is the critical voltage to compensate transistor TC2.
In addition, transistor T3 is connected according to LED control signal EM [N] in second phase P2.Therefore, according to transistor T2 The driving current I1 that is exported of voltage level of control terminal be shown below:
Wherein, K is for conductive parameters (Conduction Parameter).VSG is the first end and control for transistor T2 Pressure difference between end processed.It is for the critical voltage of transistor T2.
Since compensation transistor TC2 is identical with the size of transistor T2, and it is configured at proximity, therefore electrically approximate phase Together.Also that is, the critical voltage of compensation transistor TC2 is similar to the critical voltage of transistor T2.
In this way, make driving current I1 critical by transistor ageing by thermal compensation signal Vcomp [n] The influence that voltage changes.Further, since data-signal Vdata [m] write-in and compensation critical voltage difference be to carry out respectively, Therefore resolution ratio and compensation time are independent of each other, and can be suitable for height in the write-in for completing data-signal Vdata [m] in the short time The display panel of resolution ratio can carry out high-frequency operation.
Further, since the data line that the first end of transistor T1 connects maintains the voltage electricity of data-signal Vdata [m] It is flat, and the voltage level difference between the control terminal and data line of transistor T2 maintains It therefore, can be by adjusting the electric leakage between control terminal and data line of the reference voltage level Vref to reduce transistor T2 Stream.In this way, which voltage level of the control terminal of transistor T2 in light emitting phase can be maintained, the control of transistor T2 is avoided Cramping between end and data line is larger and occurs the phenomenon that flashing (Flicker) at low frequency operation (Idle mode).
Please refer to Fig. 5 A.Fig. 5 A is to exemplify another display panel 100 according to the implementation of the other parts of present disclosure Schematic diagram.It with similar element in the embodiment of Figure 1A is indicated with identical component symbol in Fig. 5 A illustrated embodiment, It is operated in previous paragraph expositor, is repeated no more in this.It is compared with Figure 1A illustrated embodiment, in some embodiments, such as Shown in Fig. 5 A, the compensation circuit 120 in display panel 100 is also comprising compensation transistor TC4.
In structure, it is similar to compensation transistor TC2, the of the first end coupling compensation transistor TC1 of compensation transistor TC4 Two ends, and the control terminal for compensating transistor TC4 is mutually coupled in compensation transistor TC2's with the second end for compensating transistor TC4 Second end.In operation, compensation transistor TC4 is to the received system high voltage electricity of second end according to self compensation transistor TC1 Flat OVDD generates thermal compensation signal Vcomp [n].
Specifically, the size of compensation transistor TC4 is identical with compensation transistor TC2.In this way, pass through compensation crystal Pipe TC4 and TC2 parallel connection compensates, and can make charging rate faster, and can faster draw the first end of capacitor C1 to compensation The voltage level of signal Vcomp [n].
Please refer to Fig. 5 B.Fig. 5 B is to exemplify another display panel 100 according to the implementation of the other parts of present disclosure Schematic diagram.It with similar element in the embodiment of Figure 1A is indicated with identical component symbol in Fig. 5 B illustrated embodiment, It is operated in previous paragraph expositor, is repeated no more in this.It is compared with Figure 1A illustrated embodiment, in some embodiments, such as Shown in Fig. 5 B, display panel 100 also includes transistor T4.
In structure, the control terminal of the first end coupling transistors T4 of transistor T4.The second end coupling of transistor T4 shines The first end of element OLED.In operation, the first end of transistor T4 is to receive scanning signal S1 [N].Transistor T4 is to root It is selectively turned on according to scanning signal S1 [N], to be reset to the anode of light-emitting component OLED by the second end of transistor T4 Low voltage level.In this way, the voltage level of the anode of light-emitting component OLED be controlled by transistor T4, so that light-emitting component OLED maintains shutdown in write phase.
Please refer to Fig. 6.Fig. 6 is to exemplify another display panel 100 according to the implementation of the other parts of present disclosure Signal sequence schematic diagram.As shown in fig. 6, in other parts embodiment, in address period Poff, the scanning of display panel 100 Signal S1 [1]~S1 [K] is sequentially connected, and LED control signal EM [G] is located at shutdown voltage level.In luminous period Pon, display The scanning signal S1 [1] of panel 100~S1 [K] shutdown, LED control signal EM [G] are located at luminous voltage level.For example, Scanning signal S1 [1] can be used to drive the pixel PI1 in Figure 1A and Figure 1B, the scanning signal in this embodiment, in Fig. 6 S1 [1] can be used to drive the grid of transistor T1 (such as the scanning signal S1 [N] in Figure 1A and Figure 1B).Scanning signal S1 [2] can be used to drive the pixel PI2 in Figure 1B.The rest may be inferred, and subsequent scanning signal can be used to drive display panel Other subsequent pixels in 100.LED control signal EM [G] is to control the display panel above-mentioned multiple pixel (examples in 100 Such as the pixel PI1-PI3 in Figure 1B) it is shone (such as the LED control signal EM [N] in Figure 1A and Figure 1B).
In other words, each pixel in display panel 100 is sequentially connected respective according to scanning signal S1 [1]~S1 [K] Write circuit 140 is to be respectively written into data-signal Vdata [m].Later, each pixel in display panel 100 is further according to luminous Control signal EM [G] on-state drive circuit 160 is shown with lighting together.
It is worth noting that, the signal sequence that skilled artisan can be directly acquainted with Fig. 6 be intended to how base Display panel 100 in above-mentioned multiple and different embodiments is to execute the operation and function, therefore no longer this is repeated.
Please refer to Fig. 7 A, Fig. 7 B.Fig. 7 A, Fig. 7 B are to exemplify another display according to the implementation of the other parts of present disclosure Panel 100 and its signal sequence schematic diagram.In Fig. 7 A, Fig. 7 B illustrated embodiment, with similar element in the embodiment of Figure 1A It is to be indicated with identical component symbol, operates in previous paragraph expositor, repeated no more in this.With Figure 1A illustrated embodiment It compares, in other parts embodiment, as shown in Figure 7 A, transistor T3 is to receive the first LED control signal EM1 [N].It mends The control terminal of transistor TC1 is repaid to receive the second LED control signal EM2 [N].
As shown in Figure 7 B, in corresponding embodiment, in first period P1, the first LED control signal EM1 [N] and second LED control signal EM2 [N] is located at shutdown voltage level.In second phase P2, the second LED control signal EM2 [N] is by turning off Voltage level switchs to luminous voltage level, and the first LED control signal EM1 [N] can be according to the luminescence display of display panel 100 Demand switches to luminous voltage level or shutdown voltage level.
In this way, by the way that LED control signal is divided into two kinds, in second phase P2, so that compensation transistor TC1 Conducting can be maintained to compensate the output of signal Vcomp [n] according to the second LED control signal EM2 [N], and to drive Transistor T2 can be according to the on or off of first LED control signal EM1 [N] selectivity to switch bright show slinkingly in circuit 160 Show.
Although disclosed method is shown and described as herein first is that the step of arranging or event, but it is to be understood that institute The sequence of these steps or event for showing should not be construed as limited significance.For example, part steps can be occurred with different order And/or with other than illustrated herein and/or described step or event other steps or event occur simultaneously.In addition, When implementing one or more aspects or embodiment described herein, and not all is all required the step of this shows.In addition, One or more steps herein may also execute the step of one or more separates and/or in the stage.
In conclusion the disclosure passes through in the above-mentioned each embodiment of application, compensation electricity is shared by two or more pixels The framework on road 120 can save the area of layout.In addition, carrying out data-signal write-in and benefit respectively by display panel 100 It repays, so that the compensation time does not influence resolution ratio, thus can be shortened the write time of data-signal, be suitable for high-resolution display Device.
Although present disclosure is disclosed as above with embodiment, so it is not limited to present disclosure, affiliated skill Art field technical staff is in the spirit and scope for not departing from present disclosure, when can make various variations and retouching, therefore this public affairs The protection scope of content is opened subject to view appended claims institute defender.

Claims (10)

1. a kind of display panel, includes:
One capacitor, the capacitor include a first end and a second end;
One compensation circuit couples the first end of the capacitor, to be reset the first end of the capacitor according to scan signal To a reference voltage level, and a system high voltage level is received according to a LED control signal and extremely should with exporting a thermal compensation signal The first end of capacitor;
One write circuit couples the second end of the capacitor, selectively turned on according to the scanning signal to export a number It is believed that number to the capacitor the second end;And
One drive circuit couples the second end of the capacitor, to be selectively turned on according to the LED control signal with basis The voltage level of the second end of the capacitor is to export a driving current to a light-emitting component.
2. display panel as described in claim 1, wherein
The write circuit includes a first transistor, and a first end of the first transistor is to receive the data-signal, this One control terminal of one transistor is to receive the scanning signal, and a second end of the first transistor is to export the data-signal To the second end of the capacitor;
The driving circuit include a second transistor and a third transistor, wherein a first end of the second transistor to The system high voltage level is received, a control terminal of the second transistor couples the second end of the capacitor, the third transistor A first end couple a second end of the second transistor, a control terminal of the third transistor is to receive the light emitting control One second end of signal, the third transistor couples the light-emitting component.
3. display panel as described in claim 1, also includes:
One the 4th transistor, a first end of the 4th transistor is to receive the scanning signal, a control of the 4th transistor End processed couples the first end of the 4th transistor, and a second end of the 4th transistor couples the light-emitting component.
4. display panel as claimed in claim 2, wherein the compensation circuit includes:
One first end of one first compensation transistor, the first compensation transistor couples the system high voltage level, first benefit A control terminal of transistor is repaid to receive the LED control signal;
One second compensation transistor, a first end of the second compensation transistor couple the one second of the first compensation transistor End, a control terminal of the second compensation transistor couples a second end of the second compensation transistor, to generate compensation letter Number;And
One third compensates transistor, and a first end of third compensation transistor is to receive the reference voltage level, the third A control terminal of transistor is compensated to receive the scanning signal, a second end of third compensation transistor couples second benefit Repay the second end of transistor.
5. display panel as claimed in claim 4, wherein the compensation circuit also includes:
One the 4th compensation transistor, the 4th compensation transistor a first end couple this first compensation transistor this second One second end coupling of end, a control terminal of the 4th compensation transistor and the 4th compensation transistor the second compensation transistor The second end.
6. display panel as claimed in claim 4, wherein
In a first period, which lead third compensation transistor and the second transistor in a low voltage level Logical, in a second phase, which close third compensation transistor and the second transistor in a high-voltage level It is disconnected.
7. display panel as claimed in claim 6, wherein
When the LED control signal be located at one shutdown voltage level, this first compensation transistor, this second compensation transistor and should Third transistor shutdown,
When the LED control signal is located at a luminous voltage level, the first compensation transistor, the second compensation transistor and should Third transistor conducting,
The time span that the LED control signal is located at the shutdown voltage level is greater than the first period.
8. display panel as claimed in claim 6, wherein the control terminal of the third transistor shines to receive one first Control signal, this first compensation transistor the control terminal to receive one second LED control signal,
The time span that first LED control signal and second LED control signal are located at the shutdown voltage level is greater than should First period,
In the second phase, which is located at the luminous voltage level or the shutdown voltage level.
9. display panel as described in claim 1, wherein the display panel includes multiple pixels,
In an address period, which is located at a shutdown voltage level, and multiple scanning signals of the pixel are sequentially Conducting,
During one shines, which is located at a luminous voltage level, the scanning signal shutdown of the pixel.
10. display panel as described in claim 1, wherein the display panel includes multiple pixels,
The first end of the capacitor of two or more pixels in the pixel is mutually coupled, to receive the identical compensation Signal.
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