WO2017118161A1 - 像素电路、其驱动方法、显示面板及显示装置 - Google Patents
像素电路、其驱动方法、显示面板及显示装置 Download PDFInfo
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- WO2017118161A1 WO2017118161A1 PCT/CN2016/102997 CN2016102997W WO2017118161A1 WO 2017118161 A1 WO2017118161 A1 WO 2017118161A1 CN 2016102997 W CN2016102997 W CN 2016102997W WO 2017118161 A1 WO2017118161 A1 WO 2017118161A1
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- 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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Definitions
- the present disclosure relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, a display panel, and a display device.
- OLED Organic Light Emitting Diode
- TFT LCD Thin Film Transistor Liquid Crystal Display
- the general pixel compensation circuit complicates the pixel structure and increases power consumption.
- Embodiments of the present disclosure provide a pixel circuit, a driving method thereof, a display panel, and a display device for reducing power consumption of a pixel circuit.
- An embodiment of the present disclosure provides a pixel circuit, including: a selection module, a writing module, a driving module, and a light emitting device;
- the first control end of the selection module is connected to the first node, the first input end is connected to the first power signal end, the second control end and the second input end are respectively connected to the second power signal end, the output end and the second end Nodes are connected to each other; the selection module is configured to output the signal of the first power signal end or the signal of the second power signal end to the second under the control of the first node and the second power signal end Node
- a control end of the driving module is connected to the first node, an input end is connected to the second node, and an output end is connected to an input end of the light emitting device;
- the driving module is used at the first node Controlling, by the signal input by the second node, driving the light emitting device to emit light;
- the output end of the light emitting device is connected to the third power signal end;
- the first control end of the writing module is configured to input a first control signal
- the second control end is configured to input a second control signal
- the first input end is connected to the data signal end
- the second input end is connected to the reference signal end
- a first output terminal is connected to the first node
- a second output terminal is connected to an input end of the light emitting device
- the writing module is configured to transmit the signal of the data signal end under the control of the first control signal Writing to the first node, initializing an input end of the light emitting device by a signal input by the reference signal terminal under the control of the second control signal.
- the selecting module specifically includes: a first switching transistor and a second switching transistor; wherein
- a gate of the first switching transistor is connected to the first node, a source is connected to the first power signal end, and a drain is connected to the second node;
- the gate and the source of the second switching transistor are respectively connected to the second power signal terminal, and the drain is connected to the second node.
- the writing module specifically includes: a data writing unit and an initializing unit;
- the control end of the data writing unit is configured to input the first control signal, the input end is connected to the data signal end, and the output end is connected to the first node; the data writing unit is configured to be in the Writing a signal of the data signal end to the first node under control of a first control signal;
- the control end of the initialization unit is configured to input the second control signal, the input end is connected to the reference signal end, the output end is connected to the input end of the light emitting device, and the initialization unit is used in the second
- the input of the light-emitting device is initialized by a signal input from the reference signal terminal under the control of the control signal.
- the data writing unit specifically includes: a third switching transistor;
- the gate of the third switching transistor is configured to input the first control signal, the source is connected to the data signal end, and the drain is connected to the first node.
- the The initialization unit specifically includes: a fourth switching transistor;
- the gate of the fourth switching transistor is configured to input the second control signal, the source is connected to the reference signal end, and the drain is connected to the input end of the light emitting device.
- the driving module specifically includes: a fifth switching transistor and a capacitor; wherein
- a gate of the fifth switching transistor is connected to the first node, a drain is connected to the second node, and a source is connected to an input end of the light emitting device;
- the capacitor is coupled between the first node and an input of the light emitting device.
- An embodiment of the present disclosure provides a driving method of the above pixel circuit according to an embodiment of the present disclosure, including:
- the writing module writes the signal of the data signal end to the first node under the control of the first control signal, and performs the input of the light emitting device through the signal input by the reference signal terminal under the control of the second control signal. initialization;
- the selection module outputs the signal of the first power signal end or the signal of the second power signal end to the second node under the control of the first node and the second power signal end, and the driving module is at the first
- the light-emitting device is driven to emit light by a signal input by the second node under the control of the node.
- An embodiment of the present disclosure provides a display panel including the above pixel circuit provided by an embodiment of the present disclosure.
- An embodiment of the present disclosure provides a display device including the above display panel provided by an embodiment of the present disclosure.
- Embodiments of the present disclosure provide a pixel circuit, a driving method thereof, a display panel, and a display device, the pixel circuit including: a selection module, a writing module, a driving module, and a light emitting device; wherein the selecting module is used at the first node and Controlling, by the second power signal terminal, the signal of the first power signal end or the signal of the second power signal end to the second node; the driving module is configured to drive the light emitting device by the signal input by the second node under the control of the first node The illuminating; the writing module is configured to write the signal of the data signal end to the first node under the control of the first control signal, and initialize the input end of the illuminating device by the signal input by the reference signal end under the control of the second control signal . In this way, the signal of the first power signal end or the signal of the second power signal end can be output to the second node through the selection module, so that the driving module can drive the light emitting device to emit light through the signal
- the power signal for driving the illumination of the light emitting device may be the signal of the first power signal end or the signal of the second power signal end.
- the selection module outputs the signal of the first power signal end to the signal.
- a second node driving the light emitting device to emit a signal of the first power signal end;
- the selecting module inputs the signal of the second power signal end to the second node, thereby driving the light emitting device to emit light
- the signal of the two power signal terminals can further realize the illumination of the light-emitting device by using the unused power signal under the high-brightness display screen and the low-brightness display screen, which is beneficial to improving the utilization of the power signal and reducing the power consumption of the pixel circuit, thereby Reduce the power consumption of the display panel.
- FIG. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present disclosure
- FIG. 2 is a schematic structural diagram of a pixel circuit according to an embodiment of the present disclosure
- FIG. 3 is a schematic diagram of input and output timing of a pixel circuit according to an embodiment of the present disclosure.
- the embodiment of the present disclosure provides a pixel circuit, as shown in FIG. 1, which may include: a selection module 01, a writing module 02, a driving module 03, and a light emitting device OLED;
- the first control terminal of the selection module 01 is connected to the first node P1, the first input terminal is connected to the first power signal terminal VDDH, the second control terminal and the second input terminal are connected to the second power signal terminal VDDL, and the output terminal and the The two nodes P2 are connected; the selection module 01 is configured to output the signal of the first power signal terminal VDDH or the signal of the second power signal terminal VDDL to the second node P2 under the control of the first node P1 and the second power signal terminal VDDL. ;
- the control end of the driving module 03 is connected to the first node P1, the input end is connected to the second node P2, and the output end is connected to the input end of the light emitting device OLED; the driving module 03 is used to pass the control of the first section P1.
- the signal input by the two-node P2 drives the light-emitting device OLED to emit light;
- the output end of the light emitting device OLED is connected to the third power signal terminal VSS;
- the first control end of the writing module 02 is for inputting the first control signal G1, the second control end is for inputting the second control signal G2, the first input end is connected with the data signal end Data, and the second input end is connected with The reference signal terminal Vs is connected, the first output terminal is connected to the first node P1, the second output terminal is connected to the input end of the light emitting device OLED, and the writing module 02 is configured to send the data signal terminal under the control of the first control signal G1.
- the signal is written to the first node P1, and the input of the light-emitting device OLED is initialized by the signal input from the reference signal terminal Vs under the control of the second control signal G2.
- the signal of the first power signal end or the signal of the second power signal end may be output to the second node by the selecting module, so that the driving module can drive the light emitting device to emit light through the signal input by the second node.
- the power signal for driving the illumination of the light emitting device may be the signal of the first power signal end or the signal of the second power signal end.
- the second node drives the light emitting device to emit a signal of the first power signal end; when the display picture is a low brightness picture, the selecting module outputs the signal of the second power signal end to the second node, thereby driving the light emitting device to emit light
- the signal of the two power signal terminals can further realize the illumination of the light-emitting device by using the unused power signal under the high-brightness display screen and the low-brightness display screen, which is beneficial to improving the utilization of the power signal and reducing the power consumption of the pixel circuit, thereby Reduce the power consumption of the display panel.
- the selection module 01 may specifically include: a first switching transistor T1 and a second switching transistor T2; wherein, the gate of the first switching transistor T1 The pole is connected to the first node P1, the source is connected to the first power signal terminal VDDH, and the drain is connected to the second node P2; the gate and the source of the second switching transistor T2 are respectively connected to the second power signal terminal VDDL, and the drain The pole is connected to the second node P2.
- the second switching transistor is connected in the form of a diode, and the signal of the second power signal terminal (for example, the level provided by the second power signal terminal is VL) can be output to the second node, so the gate and the source of the first switching transistor
- a switching transistor outputs a signal of the first power signal terminal (for example, a level provided by the first power signal terminal is VH) to the second node, thereby driving the power signal of the light emitting device to emit light as VH; when Va ⁇ VL ⁇ Vth, the first A switching transistor is turned off, the second switching transistor is turned on, and the second switching transistor that is turned on outputs the signal VL of the second power signal terminal to the second node, thereby driving the power signal of the light emitting device to be VL.
- the writing module 02 may specifically include: a data writing unit 021 and an initializing unit 022; wherein, the control end of the data writing unit 021 For inputting the first control signal G1, the input terminal is connected to the data signal terminal Data, and the output terminal is connected to the first node P1; the data writing unit 021 is configured to signal the data signal terminal Data under the control of the first control signal G1.
- the control terminal of the initialization unit 022 is for inputting the second control signal G2, the input terminal is connected to the reference signal terminal Vs, and the output terminal is connected to the input end of the light emitting device OLED; the initialization unit 022 is used for The input of the light-emitting device OLED is initialized by the signal input from the reference signal terminal Vs under the control of the two control signals G2.
- the writing module may include a data writing unit and an initializing unit, and the data writing unit may write the signal of the data signal end to the first under the control of the first control signal.
- the node, the initialization unit may initialize the input end of the light emitting device by the signal input from the reference signal terminal under the control of the second control signal.
- the data writing unit 021 may specifically include: a third switching transistor T3; a gate of the third switching transistor T3 is used to input the first
- the control signal G1 has a source connected to the data signal terminal Data and a drain connected to the first node P1.
- the third switching transistor can be turned on under the control of the first control signal, and the turned-on third switching transistor turns on the data signal end and the first node, so that the signal of the data signal end can be output to the first node.
- the initializing unit 022 may specifically include: a fourth switching transistor T4; and a gate of the fourth switching transistor T4 is configured to input a second control signal.
- G2 the source is connected to the reference signal terminal Vs, and the drain is connected to the input end of the light emitting device OLED.
- the fourth switching transistor can be turned on under the control of the second control signal, and the turned-on fourth switching transistor turns on the reference signal end and the input end of the light emitting device, so that the signal of the reference signal end can be output to the light emitting device.
- the input end of the light-emitting device is initialized, so that the illuminator can be prevented from being in a forward-biased state for a long time, which is beneficial to slow down the aging speed of the light-emitting device.
- the driving module 03 may specifically include: a fifth switching transistor T5 and a capacitor C; wherein, the gate and the fifth of the fifth switching transistor T5 One node P1 is connected, the drain is connected to the second node P2, and the source and the light are The input end of the device OLED is connected; the capacitor C is connected between the first node P1 and the input end of the light emitting device OLED.
- the fifth switching transistor can be turned on under the control of the first node, and the fifth switching transistor that is turned on turns the second node and the input end of the light emitting device, and can further drive the light through the power signal input by the second node. The device emits light.
- the switching transistor mentioned in the above embodiments of the present disclosure may be a thin film transistor (TFT) or a metal oxide semiconductor field effect transistor (MOS) (Metal Oxide Scmiconductor), which is not limited herein. .
- TFT thin film transistor
- MOS metal oxide semiconductor field effect transistor
- the sources and drains of these transistors can be interchanged without specific distinction.
- a thin film transistor will be described as an example in describing a specific embodiment.
- the working process of the pixel circuit provided by the embodiment of the present disclosure is described in detail below in conjunction with the pixel circuit and the operation timing provided by the embodiment of the present disclosure.
- the working process of the pixel circuit provided by the embodiment of the present disclosure is described by taking the pixel circuit shown in FIG. 2 and the input/output timing chart of FIG. 2 as an example. Specifically, two stages t1 to t2 in the input/output timing chart shown in FIG. 3 are selected. In the following description, a high level signal is indicated by 1 and a low level signal is indicated by 0.
- the third switching transistor T3 and the fourth switching transistor T4 are turned on; the turned-on third switching transistor T3 turns on the data signal terminal Data and the first node P1, so the data signal terminal is turned on.
- the data input signal Vdata is output to the first node P1; the turned-on fourth switching transistor T4 turns on the reference signal terminal Vs and the input end of the light emitting device OLED, so the signal Vref of the reference signal terminal Vs is output to the input of the light emitting device OLED.
- the light emitting device OLED is initialized; at this time, the voltage difference across the capacitor C is Vdata-Vref.
- the t1 phase is the write phase.
- K is a constant related to the process parameters and geometric dimensions of the fifth switching transistor T5
- Vgs5 is the voltage difference between the gate and the source of the fifth switching transistor T5.
- the current for driving the light emitting device OLED to emit light is independent of the signal Vss of the third power signal terminal VSS, so that the influence of the voltage drop of the third power signal terminal VSS on the light emitting brightness of the light emitting device can be eliminated, and the display of the display panel is improved.
- the t2 phase is the illuminating phase.
- the aspect ratio of the first switching transistor is larger than the aspect ratio of the second switching transistor, so the threshold voltage of the first switching transistor is smaller than the threshold voltage of the second switching transistor.
- an embodiment of the present disclosure provides a driving method of the foregoing pixel circuit according to an embodiment of the present disclosure, which may specifically include:
- the writing module writes the signal of the data signal end to the first node under the control of the first control signal, and initializes the input end of the light emitting device by the signal input by the reference signal terminal under the control of the second control signal.
- the selection module outputs the signal of the first power signal end or the signal of the second power signal end to the second node under the control of the first node and the second power signal end, and the driving module passes under the control of the first node.
- the signal input by the second node drives the light emitting device to emit light.
- the writing of the data and the initialization of the input end of the light emitting device are completed in the writing phase, and the signal of the first power signal terminal or the second power signal is selected in the light emitting phase.
- the signal of the terminal acts as a power signal for driving the illumination of the illumination device and outputs to the second node
- the drive module drives the illumination device to emit light through the signal input by the second node under the control of the first node, thereby achieving high brightness display and Low brightness display
- the unused power signals are used to drive the light-emitting device to emit light, which is beneficial to improving the utilization of the power signal and reducing the power consumption of the pixel circuit, thereby reducing the power consumption of the display panel.
- an embodiment of the present disclosure provides a display panel including the above pixel circuit provided by an embodiment of the present disclosure. Since the principle of solving the problem of the display panel is similar to that of the pixel circuit, the implementation of the display panel can be referred to the implementation of the pixel circuit described above, and the repeated description is omitted.
- an embodiment of the present disclosure provides a display device including the above display panel provided by an embodiment of the present disclosure.
- the display device can be applied to any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like. Since the principle of solving the problem is similar to that of the display panel, the implementation of the display device can be referred to the implementation of the above display panel, and the repeated description is omitted.
- Embodiments of the present disclosure provide a pixel circuit, a driving method thereof, a display panel, and a display device, the pixel circuit including: a selection module, a writing module, a driving module, and a light emitting device; wherein the selecting module is used at the first node and Controlling, by the second power signal end, outputting the signal of the first power signal end or the signal of the second power signal end to the second node; the driving module is configured to drive the light by the signal input by the second node under the control of the first node The device emits light; the writing module is configured to write the signal of the data signal end to the first node under the control of the first control signal, and control the input end of the light emitting device by the signal input by the reference signal terminal under the control of the second control signal initialization. In this way, the signal of the first power signal end or the signal of the second power signal end can be selected by the selection module to be output to the second node, so that the driving module can drive the light emitting device to emit light through the
- the power signal for driving the illumination of the light emitting device may be the signal of the first power signal end or the signal of the second power signal end.
- the selection module selects the signal output of the first power signal end. Going to the second node, driving the light emitting device to emit a signal of the first power signal end; when the display picture is a low brightness picture, the selecting module selects to input the signal of the second power signal end to the second node, thereby driving the light emitting device to emit light.
Abstract
Description
Claims (9)
- 一种像素电路,包括:选择模块、写入模块、驱动模块和发光器件;其中,所述选择模块的第一控制端与第一节点相连,第一输入端与第一电源信号端相连,第二控制端和第二输入端与第二电源信号端相连,输出端与第二节点相连;所述选择模块被配置为在所述第一节点和所述第二电源信号端的控制下,选择所述第一电源信号端的信号或所述第二电源信号端的信号输出到所述第二节点;所述驱动模块的控制端与所述第一节点相连,输入端与所述第二节点相连,输出端与所述发光器件的输入端相连;所述驱动模块被配置为在所述第一节点的控制下,通过所述第二节点输入的信号驱动所述发光器件发光;所述发光器件的输出端与第三电源信号端相连;所述写入模块的第一控制端用于输入第一控制信号,第二控制端用于输入第二控制信号,第一输入端与数据信号端相连,第二输入端与参考信号端相连,第一输出端与所述第一节点相连,第二输出端与所述发光器件的输入端相连;所述写入模块被配置为在所述第一控制信号的控制下将所述数据信号端的信号写入到所述第一节点,在所述第二控制信号的控制下通过所述参考信号端输入的信号对所述发光器件的输入端进行初始化。
- 如权利要求1所述的像素电路,其中,所述选择模块包括:第一开关晶体管和第二开关晶体管;其中,所述第一开关晶体管的栅极与所述第一节点相连,源极与所述第一电源信号端相连,漏极与所述第二节点连接;所述第二开关晶体管的栅极和源极与所述第二电源信号端相连,漏极与所述第二节点相连。
- 如权利要求1或2所述的像素电路,其中,所述写入模块包括:数据写入单元和初始化单元;其中,所述数据写入单元的控制端用于输入所述第一控制信号,输入端与所述数据信号端相连,输出端与所述第一节点相连;所述数据写入单元被配置为 在所述第一控制信号的控制下将所述数据信号端的信号写入到所述第一节点;所述初始化单元的控制端用于输入所述第二控制信号,输入端与所述参考信号端相连,输出端与所述发光器件的输入端相连;所述初始化单元被配置为在所述第二控制信号的控制下通过所述参考信号端输入的信号对所述发光器件的输入端进行初始化。
- 如权利要求3所述的像素电路,其中,所述数据写入单元包括:第三开关晶体管;所述第三开关晶体管的栅极用于接收所述第一控制信号,源极与所述数据信号端相连,漏极与所述第一节点相连。
- 如权利要求3或4所述的像素电路,其中,所述初始化单元包括:第四开关晶体管;所述第四开关晶体管的栅极用于接收所述第二控制信号,源极与所述参考信号端相连,漏极与所述发光器件的输入端相连。
- 如权利要求1-5任一项所述的像素电路,其中,所述驱动模块包括:第五开关晶体管和电容;其中,所述第五开关晶体管的栅极与所述第一节点相连,漏极与所述第二节点相连,源极与所述发光器件的输入端相连;所述电容连接于所述第一节点和所述发光器件的输入端之间。
- 一种如权利要求1-6任一项所述的像素电路的驱动方法,包括:在写入阶段,写入模块在第一控制信号的控制下将数据信号端的信号写入到第一节点,在第二控制信号的控制下通过参考信号端输入的信号对发光器件的输入端进行初始化;在发光阶段,选择模块在所述第一节点和第二电源信号端的控制下,将第一电源信号端的信号或所述第二电源信号端的信号输出到第二节点,驱动模块在所述第一节点的控制下,通过所述第二节点输入的信号驱动所述发光器件发光。
- 一种显示面板,包括如权利要求1-6任一项所述的像素电路。
- 一种显示装置,包括如权利要求8所述的显示面板。
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