CN205810345U - A kind of image element circuit, organic EL display panel and display device - Google Patents
A kind of image element circuit, organic EL display panel and display device Download PDFInfo
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Abstract
The utility model discloses a kind of image element circuit, organic EL display panel and display device, including: Data write. module, supply voltage control module, conducting control module, memory module, light emitting control module, driving transistor and luminescent device；Wherein, by above-mentioned five modules and drive the cooperating of transistor, the operating current driving light emission drive transistor device luminous in image element circuit can be made only relevant with the voltage of the voltage of data signal end and initial signal end, and it is unrelated with the voltage of the threshold voltage driving transistor and the first power end, the impact of threshold voltage and the IR Drop operating current on flowing through luminescent device driving transistor can be avoided, so that the operating current of driven for emitting lights device luminescence keeps stable, and then improve the uniformity of viewing area picture brightness in display device.
Description
Technical Field
The utility model relates to a show technical field, in particular to pixel circuit, organic electroluminescent display panel and display device.
Background
Organic Light Emitting Diodes (OLEDs) are one of the hot spots in the research field of flat panel displays, and compared with Liquid Crystal Displays (LCDs), OLED displays have the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, fast response speed, and the like. Currently, in the display fields of mobile phones, tablet computers, digital cameras, and the like, OLED displays have begun to replace traditional LCD displays.
Unlike LCDs, which control brightness using a stable voltage, OLEDs are current driven and require a stable current to control their light emission. The threshold voltage V of the driving transistor of the pixel circuit is reduced due to aging of the device and the processthThere is non-uniformity, which causes the current flowing through each OLED to vary, resulting in non-uniform display brightness, thereby affecting the display effect of the whole image. And because the current flowing through each OLED is related to the source electrode of the driving tube, namely the power supply voltage, the current difference of different areas can be caused due to the IRDrop, and further the brightness of the OLEDs in different areas is uneven.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a pixel circuit, organic electroluminescent display panel and display device for make the luminous operating current of drive light emitting device remain stable, improve the homogeneity of image display luminance.
An embodiment of the utility model provides a pixel circuit, include: the device comprises a data writing module, a power supply voltage control module, a conduction control module, a storage module, a light-emitting control module, a driving transistor and a light-emitting device; wherein,
the first end of the data writing module is connected with the scanning signal end, the second end of the data writing module is connected with the data signal end, and the third end of the data writing module is connected with the first node; the data writing module is used for providing the signal of the data signal end to the first node under the control of the scanning signal end;
The first end of the power supply voltage control module is connected with the first light-emitting control signal end, the second end of the power supply voltage control module is connected with the first power supply end, and the third end of the power supply voltage control module is respectively connected with the second node and the source electrode of the driving transistor; the power supply voltage control module is used for providing a signal of the first power supply end to the second node under the control of the first lighting control signal end;
the first end of the conduction control module is connected with the initial signal end, the second end of the conduction control module is connected with the second power supply end, the third end of the conduction control module is connected with the grid electrode of the driving transistor, and the fourth end of the conduction control module is connected with the drain electrode of the driving transistor; the conduction control module is used for controlling the driving transistor to be in a diode state through the initial signal end and the second power end;
the first end of the storage module is connected with the first node, and the second end of the storage module is connected with the second node; the storage module is used for charging or discharging under the common control of the signal of the first node and the signal of the second node, and keeping the voltage difference between the first node and the second node stable when the first node is in a floating state;
the first end of the light-emitting control module is connected with a second light-emitting control signal end, the second end of the light-emitting control module is connected with the first node, the third end of the light-emitting control module is connected with the grid electrode of the driving transistor, the fourth end of the light-emitting control module is connected with the drain electrode of the driving transistor, the fifth end of the light-emitting control module is connected with the first end of the light-emitting device, and the second end of the light-emitting device is connected with the second power supply end; the light-emitting control module is used for conducting the first node and the grid electrode of the driving transistor and conducting the drain electrode of the driving transistor and the light-emitting device under the control of the second light-emitting control signal end so as to control the driving transistor to drive the light-emitting device to emit light.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the conduction control module includes: the first conduction control submodule and the second conduction control submodule; wherein,
the first end of the first conduction control submodule is connected with the scanning signal end, the second end of the first conduction control submodule is connected with the initial signal end, and the third end of the first conduction control submodule is connected with the grid electrode of the driving transistor; the first conduction control submodule is used for providing a signal of the initial signal end to the grid electrode of the driving transistor under the control of the scanning signal end;
the first end of the second conduction control submodule is connected with the scanning signal end, the second end of the second conduction control submodule is connected with the second power supply end, and the third end of the second conduction control submodule is connected with the drain electrode of the driving transistor; the second conduction control submodule is used for supplying the signal of the second power supply end to the drain electrode of the driving transistor under the control of the scanning signal end.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the first conduction control sub-module includes: a first switching transistor; wherein,
the grid electrode of the first switch transistor is connected with the scanning signal end, the source electrode of the first switch transistor is connected with the initial signal end, and the drain electrode of the first switch transistor is connected with the grid electrode of the driving transistor.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the second conduction control sub-module includes: a second switching transistor; wherein,
and the grid electrode of the second switch transistor is connected with the scanning signal end, the source electrode of the second switch transistor is connected with the second power supply end, and the drain electrode of the second switch transistor is connected with the drain electrode of the driving transistor.
In a possible implementation manner, in the above pixel circuit provided by an embodiment of the present invention, the data writing module includes: a third switching transistor; wherein,
and the grid electrode of the third switching transistor is connected with the scanning signal end, the source electrode of the third switching transistor is connected with the data signal end, and the drain electrode of the third switching transistor is connected with the first node.
In a possible implementation manner, in the pixel circuit provided by an embodiment of the present invention, the power supply voltage control module includes: a fourth switching transistor; wherein,
and the grid electrode of the fourth switching transistor is connected with the first light-emitting control signal end, the source electrode of the fourth switching transistor is connected with the first power supply end, and the drain electrode of the fourth switching transistor is connected with the second node.
In a possible implementation manner, in the above-mentioned pixel circuit provided by an embodiment of the present invention, the light-emitting control module includes: a fifth switching transistor and a sixth switching transistor; wherein,
A grid electrode of the fifth switching transistor is connected with the second light-emitting control signal end, a source electrode of the fifth switching transistor is connected with the first node, and a drain electrode of the fifth switching transistor is connected with a grid electrode of the driving transistor;
and the grid electrode of the sixth switching transistor is connected with the second light-emitting control signal end, the source electrode of the sixth switching transistor is connected with the drain electrode of the driving transistor, and the drain electrode of the sixth switching transistor is connected with the first end of the light-emitting device.
In a possible implementation manner, in the above pixel circuit provided by an embodiment of the present invention, the storage module includes: a capacitor; wherein,
the first end of the capacitor is connected with the first node, and the second end of the capacitor is connected with the second node.
In a possible implementation manner, in the above pixel circuit provided by an embodiment of the present invention, the driving transistor is a P-type transistor.
In one possible implementation manner, in the pixel circuit provided by the embodiment of the present invention, all the switch transistors are P-type transistors.
Correspondingly, the embodiment of the utility model provides an organic electroluminescence display panel is still provided, include the embodiment of the utility model provides an arbitrary kind of pixel circuit of above-mentioned.
Correspondingly, the embodiment of the utility model provides a display device is still provided, include the embodiment of the utility model provides an above-mentioned any kind of organic electroluminescence display panel.
The embodiment of the utility model provides a pixel circuit, organic electroluminescent display panel and display device, include: the device comprises a data writing module, a power supply voltage control module, a conduction control module, a storage module, a light-emitting control module, a driving transistor and a light-emitting device; the data writing module is used for providing a signal of the data signal end to the first node under the control of the scanning signal end; the power supply voltage control module is used for providing a signal of a first power supply end to a second node under the control of the first light-emitting control signal end; the conduction control module is used for controlling the driving transistor to be in a diode state through the initial signal end and the second power end; the storage module is used for charging or discharging under the common control of the signal of the first node and the signal of the second node, and keeping the voltage difference between the first node and the second node stable when the first node is in a floating state; the light-emitting control module is used for conducting the first node and the grid electrode of the driving transistor and conducting the drain electrode of the driving transistor and the light-emitting device under the control of the second light-emitting control signal end so as to control the driving transistor to drive the light-emitting device to emit light. The embodiment of the utility model provides a pixel circuit, organic electroluminescent display panel and display device, through above-mentioned five modules and drive transistor mutually support, the luminous operating current of drive transistor drive luminescent device in can making pixel circuit only is relevant with the voltage of data signal end and the voltage of initial signal end, and the voltage with drive transistor's threshold voltage and first power end is irrelevant, can avoid drive transistor's threshold voltage and the influence of IR Drop to the operating current who flows luminescent device, thereby make the luminous operating current of drive luminescent device remain stable, and then improve the homogeneity of the regional picture luminance of demonstration in the display device.
Drawings
Fig. 1a is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
fig. 1b is a second schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
fig. 2a is a schematic diagram of a specific structure of a pixel circuit according to an embodiment of the present invention;
fig. 2b is a second schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
fig. 2c is a third schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
fig. 2d is a fourth schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 3a is a circuit timing diagram of the pixel circuit shown in FIG. 2 a;
FIG. 3b is a circuit timing diagram of the pixel circuit shown in FIG. 2 b;
fig. 4 is a flowchart of a driving method of a pixel circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, specific embodiments of a pixel circuit, an organic electroluminescent display panel and a display device according to embodiments of the present invention are described in detail below with reference to the accompanying drawings.
An embodiment of the present invention provides a pixel circuit, as shown in fig. 1a, including: the light-emitting device comprises a data writing module 1, a power supply voltage control module 2, a conduction control module 3, a storage module 4, a light-emitting control module 5, a driving transistor M0 and a light-emitting device L; wherein,
A first end of the Data writing module 1 is connected with a scanning signal end Scan, a second end is connected with a Data signal end Data, and a third end is connected with a first node A; the Data writing module 1 is used for providing the signal of the Data signal terminal Data to the first node A under the control of the scanning signal terminal Scan;
a first end of the power supply voltage control module 2 is connected with the first light emitting control signal end EM1, a second end is connected with the first power supply end VDD, and a third end is respectively connected with the second node B and the source electrode S of the driving transistor M0; the power supply voltage control module 2 is configured to provide a signal of the first power supply terminal VDD to the second node B under the control of the first lighting control signal terminal EM 1;
a first end of the conduction control module 3 is connected with the initial signal end Int, a second end is connected with the second power supply end VEE, a third end is connected with the gate G of the driving transistor M0, and a fourth end is connected with the drain D of the driving transistor M0; the conduction control module 3 is used for controlling the driving transistor M0 to be in a diode state through the initial signal terminal Int and the second power supply terminal VEE;
the first end of the storage module 4 is connected with the first node A, and the second end is connected with the second node B; the storage module 4 is used for charging or discharging under the common control of the signal of the first node a and the signal of the second node B, and keeping the voltage difference between the first node a and the second node B stable when the first node a is in a floating state;
The first end of the light emission control module 5 is connected to the second light emission control signal end EM2, the second end is connected to the first node a, the third end is connected to the gate G of the driving transistor M0, the fourth end is connected to the drain D of the driving transistor M0, the fifth end is connected to the first end of the light emitting device L, and the second end of the light emitting device L is connected to the second power supply terminal VEE; the light emitting control module 5 is configured to turn on the first node a and the gate G of the driving transistor M0 and turn on the drain D of the driving transistor M0 and the light emitting device L under the control of the second light emitting control signal terminal EM2 to control the driving transistor M0 to drive the light emitting device L to emit light.
The embodiment of the utility model provides an above-mentioned pixel circuit, include: the device comprises a data writing module, a power supply voltage control module, a conduction control module, a storage module, a light-emitting control module, a driving transistor and a light-emitting device; the data writing module is used for providing a signal of the data signal end to the first node under the control of the scanning signal end; the power supply voltage control module is used for providing a signal of a first power supply end to a second node under the control of the first light-emitting control signal end; the conduction control module is used for controlling the driving transistor to be in a diode state through the initial signal end and the second power end; the storage module is used for charging or discharging under the common control of the signal of the first node and the signal of the second node, and keeping the voltage difference between the first node and the second node stable when the first node is in a floating state; the light-emitting control module is used for conducting the first node and the grid electrode of the driving transistor and conducting the drain electrode of the driving transistor and the light-emitting device under the control of the second light-emitting control signal end so as to control the driving transistor to drive the light-emitting device to emit light. The embodiment of the utility model provides a pixel circuit mutually supports through above-mentioned five modules and driving transistor, the luminous operating current of driving transistor drive luminescent device in can making pixel circuit only is relevant with the voltage of data signal end and the voltage of initial signal end, and is irrelevant with the threshold voltage of driving transistor and the voltage of first power end, can avoid driving transistor's threshold voltage and the influence of IR Drop to the operating current who flows through luminescent device, thereby make the luminous operating current of drive luminescent device remain stable, and then improve the homogeneity of display area picture luminance among the display device.
In practical implementation, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 1a, the driving transistor M0 is a P-type transistor. Due to the threshold voltage V of the P-type transistorthGenerally, the voltage V of the first power source terminal is negative to ensure the normal operation of the driving transistor M0ddNormally positive, voltage V at the second supply terminaleeTypically ground or negative.
In the above-mentioned pixel circuit provided by the embodiment of the present invention, the voltage V of the first power source terminalddAre all greater than the voltage V of the second power supply terminaleeAnd a voltage V of the initial signal terminalInt. And the voltage V of the first power supply terminalddVoltage V to initial signal terminalIntThe formula needs to be satisfied: vdd>VInt-Vth。
In practical implementation, in the pixel circuit provided in the embodiments of the present invention, the light emitting device is generally an organic electroluminescent diode, which emits light under the action of the current when the driving transistor is in a saturation state.
In specific implementation, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 1b, the conduction control module 3 specifically includes: a first conduction control submodule 31 and a second conduction control submodule 32; wherein,
A first end of the first conduction control submodule 31 is connected to the Scan signal end Scan, a second end is connected to the initial signal end Int, and a third end is connected to the gate G of the driving transistor M0; the first conduction control submodule 31 is configured to provide a signal at the initial signal terminal Int to the gate G of the driving transistor M0 under the control of the Scan signal terminal Scan;
the first end of the second conduction control submodule 32 is connected to the Scan signal end Scan, the second end is connected to the second power supply end VEE, and the third end is connected to the drain D of the driving transistor M0; the second turn-on control submodule 32 is operable to supply the signal of the second power supply terminal VEE to the drain D of the driving transistor M0 under the control of the Scan signal terminal Scan.
The present invention will be described in detail with reference to the following embodiments. It should be noted that the present embodiment is only for better explaining the present invention, but not limiting the present invention.
Specifically, in implementation, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 2a to 2d, the first conduction control sub-module 31 may specifically include: a first switching transistor M1; wherein,
the first switching transistor M1 has a gate connected to the Scan signal terminal Scan, a source connected to the initialization signal terminal Int, and a drain connected to the gate G of the driving transistor M0.
In practical implementation, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 2a and fig. 2c, the first switch transistor M1 may be a P-type switch transistor; alternatively, as shown in fig. 2b and 2d, the first switching transistor M1 may be an N-type switching transistor, which is not limited herein.
In a specific implementation, in the pixel circuit provided in the present invention, when the first switching transistor is in the on state under the control of the scan signal terminal, the signal of the initial signal terminal is provided to the gate of the driving transistor.
The embodiment of the present invention provides a specific structure of the first conduction control submodule in the pixel circuit, and when the specific structure is implemented, the specific structure of the first conduction control submodule is not limited to the structure provided by the embodiment of the present invention, and may also be other structures known to those skilled in the art, and is not limited herein.
Specifically, in implementation, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 2a to 2d, the second conduction control sub-module 32 may specifically include: a second switching transistor M2; wherein,
the second switching transistor M2 has a gate connected to the Scan signal terminal Scan, a source connected to the second power source terminal VEE, and a drain connected to the drain D of the driving transistor M0.
In practical implementation, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 2a and fig. 2c, the second switching transistor M2 may be a P-type switching transistor; alternatively, as shown in fig. 2b and 2d, the second switching transistor M2 may be an N-type switching transistor, which is not limited herein.
In a specific implementation, in the pixel circuit provided in the present invention, when the second switching transistor is in an on state under the control of the scan signal terminal, the signal of the second power supply terminal is provided to the drain of the driving transistor.
The embodiment of the present invention provides a specific structure of the second conduction control submodule in the pixel circuit, and when the specific structure is implemented, the specific structure of the second conduction control submodule is not limited to the structure provided by the embodiment of the present invention, and may also be other structures known to those skilled in the art, and is not limited herein.
Specifically, in the embodiment of the present invention, as shown in fig. 2a to 2d, in the pixel circuit provided in the embodiment of the present invention, the data writing module 1 may specifically include: a third switching transistor M3; wherein,
the third switching transistor M3 has a gate connected to the Scan signal terminal Scan, a source connected to the Data signal terminal Data, and a drain connected to the first node a.
In practical implementation, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 2a and fig. 2c, the third switching transistor M3 may be a P-type switching transistor; alternatively, as shown in fig. 2b and 2d, the third switching transistor M3 may be an N-type switching transistor, which is not limited herein.
In this case, the third switching transistor is turned on under the control of the scan signal terminal, and the signal of the data signal terminal is provided to the first node.
The above is merely an example to illustrate a specific structure of the data writing module in the pixel circuit provided by the embodiment of the present invention, and in the specific implementation, the specific structure of the data writing module is not limited to the above structure provided by the embodiment of the present invention, and may be other structures known to those skilled in the art, which is not limited herein.
Specifically, in the embodiment of the present invention, as shown in fig. 2a to 2d, the power voltage control module 2 may specifically include: a fourth switching transistor M4; wherein,
the fourth switching transistor M4 has a gate connected to the first light-emitting control signal terminal EM1, a source connected to the first power terminal VDD, and a drain connected to the second node B.
In practical implementation, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 2a and fig. 2d, the fourth switching transistor M4 may be a P-type switching transistor; alternatively, as shown in fig. 2b and 2c, the fourth switching transistor M4 may be an N-type switching transistor, which is not limited herein.
In this case, the fourth switch transistor is turned on under the control of the first light-emitting control signal terminal, and the signal of the first power source terminal is provided to the second node.
The above is merely an example to illustrate the specific structure of the power supply voltage control module in the pixel circuit provided by the embodiment of the present invention, and when the specific structure is implemented, the specific structure of the power supply voltage control module is not limited to the above structure provided by the embodiment of the present invention, and may also be other structures known by those skilled in the art, which are not limited herein.
Specifically, in the embodiment of the present invention, as shown in fig. 2a to 2d, in the pixel circuit provided in the embodiment of the present invention, the light-emitting control module 5 specifically includes: a fifth switching transistor M5 and a sixth switching transistor M6; wherein,
a gate electrode of the fifth switching transistor M5 is connected to the second emission control signal terminal EM2, a source electrode thereof is connected to the first node a, and a drain electrode thereof is connected to the gate electrode G of the driving transistor M0;
The sixth switching transistor M6 has a gate connected to the second light emission control signal terminal EM2, a source connected to the drain D of the driving transistor M0, and a drain connected to the first terminal of the light emitting device L of the sixth switching transistor M6.
In practical implementation, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 2a and 2d, the fifth switching transistor M5 and the sixth switching transistor M6 may be P-type switching transistors; alternatively, as shown in fig. 2b and 2c, the fifth switching transistor M5 and the sixth switching transistor M6 may be N-type switching transistors, which is not limited herein.
In a specific implementation manner, in the pixel circuit provided in the embodiment of the present invention, when the fifth switching transistor is in a conducting state under the control of the second light-emitting control signal terminal, the first node and the second node are conducted, so as to provide the signal of the first node to the second node, so as to provide at least the threshold voltage of the driving transistor and the voltage of the first power source terminal to the gate of the driving transistor; and when the sixth switching transistor is in a conducting state under the control of the second light-emitting control signal end, the drain electrode of the driving transistor and the light-emitting device are conducted so as to control the driving transistor to drive the light-emitting device to emit light.
The above is merely an example to illustrate a specific structure of the light emission control module in the pixel circuit provided by the embodiment of the present invention, and when the present invention is implemented, the specific structure of the light emission control module is not limited to the above structure provided by the embodiment of the present invention, and may be other structures known to those skilled in the art, which are not limited herein.
Specifically, in the embodiment of the present invention, as shown in fig. 2a to 2d, in the pixel circuit provided in the embodiment of the present invention, the storage module 4 may specifically include: a capacitor C; wherein,
the first terminal of the capacitor C is connected to the first node a, and the second terminal is connected to the second node C.
In specific implementation, in the pixel circuit provided in the embodiment of the present invention, the capacitor is charged under the common control of the signal of the first node and the signal of the second node; and discharging under common control of the signal of the first node and the signal of the second node; and when the first node is in a floating state, keeping the voltage difference between the first node and the second node stable to drive the threshold voltage V of the transistorthAnd a voltage V of the first power supply terminalddIs stored in the first node.
The above is merely an example to illustrate a specific structure of a memory module in a pixel circuit provided by the embodiments of the present invention, and in a specific implementation, the specific structure of the memory module is not limited to the above structure provided by the embodiments of the present invention, and may be other structures known to those skilled in the art, which are not limited herein.
Further, in the above-mentioned pixel circuit provided by the embodiment of the present invention, as shown in fig. 2a, all the switch transistors may be P-type transistors, or as shown in fig. 2b, all the switch transistors may be N-type transistors, which is not limited herein.
Preferably, since the driving transistor M0 is a P-type transistor, in the pixel circuit provided by the embodiment of the present invention, as shown in fig. 2a, all the switching transistors are P-type transistors. Therefore, the manufacturing process flow of the pixel circuit can be simplified.
In a specific implementation, in the pixel circuit provided in the embodiment of the present invention, the P-type switching transistor is turned off under a high potential and turned on under a low potential; the N-type switch transistor is turned on under the action of high potential and turned off under the action of low potential.
In the pixel circuit provided in the embodiments of the present invention, the driving Transistor and the switching Transistor may be Thin Film Transistors (TFTs) or Metal Oxide semiconductor field effect transistors (MOS), which is not limited herein. In specific implementation, the source and the drain of the switching transistor may have their functions interchanged according to the type of the switching transistor and the signal at the signal terminal, and are not particularly distinguished herein. In describing the embodiments, the driving transistor and the switching transistor are exemplified as thin film transistors.
The following takes the pixel circuit shown in fig. 2a and fig. 2b as an example, and the working process of the pixel circuit provided by the embodiment of the present invention is described with reference to the circuit timing diagram. In the following description, 1 denotes a high potential, and 0 denotes a low potential. It should be noted that 1 and 0 are logic potentials, which are only used to better explain the specific operation of the embodiments of the present invention, and are not potentials applied to the gate of each switching transistor in the specific implementation.
The first embodiment,
As shown in fig. 2a, the driving transistor M0 is a P-type transistor, and all the switching transistors are P-type transistors; each switching transistor is cut off under the action of high level and is switched on under the action of low level; the corresponding input timing diagram is shown in fig. 3 a. Specifically, four phases of T1, T2, T3, and T4 in the input timing diagram shown in fig. 3a are selected.
In stage T1, Scan is 0, EM1 is 0, and EM2 is 1.
Since Scan is 0, the first switching transistor M1, the second switching transistor M2, and the third switching transistor M3 are all turned on; since EM1 is 0, the fourthThe switching transistor M4 is turned on; since EM2 is equal to 1, both the fifth switching transistor M5 and the sixth switching transistor M6 are turned off. The turned-on third switching transistor M3 converts the voltage V of the Data signal terminal Data into DataIs supplied to a first node A, i.e. a first terminal of a capacitor C, so that the voltage at the first terminal of the capacitor C is VData(ii) a The turned-on fourth switching transistor M4 applies the voltage V of the first power source terminal VDDddIs provided to the second node B, i.e. the source S of the driving transistor M0 and the second terminal of the capacitor C, so that the voltage at the second terminal of the capacitor C is Vdd(ii) a The turned-on first switching transistor M1 switches the voltage V of the initial signal terminal IntIntA gate G provided to the driving transistor M0; the turned-on second switching transistor M2 applies the voltage V of the second power source terminal VEEeeIs provided to the drain D of the driving transistor M0 to control the driving transistor M0 to be in a diode state to control the driving transistor M0 to have a stable current flowing from its source to its drain. But since the sixth switching transistor M6 is turned off, the light emitting device L does not emit light.
In stage T2, Scan is 0, EM1 is 1, and EM2 is 1.
Since Scan is 0, the first switching transistor M1, the second switching transistor M2, and the third switching transistor M3 are all turned on; since EM2 is 1, both the fifth switching transistor M5 and the sixth switching transistor M6 are turned off; since EM1 is 1, the fourth switching transistor M4 is turned off. The turned-on third switching transistor M3 converts the voltage V of the Data signal terminal Data into DataIs supplied to a first node A, i.e. a first terminal of a capacitor C, so that the voltage at the first terminal of the capacitor C is VData(ii) a The turned-off fourth switching transistor M4 disconnects the first power terminal VDD from the second node B, and thus the second node B is in a floating state; the turned-on first switching transistor M1 switches the voltage V of the initial signal terminal IntIntA gate G provided to the driving transistor M0; the turned-on second switching transistor M2 applies the voltage V of the second power source terminal VEEeeThe drain D of the driving transistor M0 is provided to control the driving transistor M0 to be in a diode state since the gate-source voltage of the driving transistor M0 is greater than the threshold voltage V thereofthTurning on the drive transistor M0; since the driving transistor M0 is in the diode state, so the capacitor C discharges through the driving transistor M0 until the voltage of the second node B, i.e. the voltage of the second terminal of the capacitor, becomes: vInt-VthWhen the driving transistor M0 is turned off, the capacitor C stops discharging, so the voltage difference between the two ends of the capacitor is: vData-VInt+Vth。
In stage T3, the previous period Scan is 1, EM1 is 1, and EM2 is 1.
Since Scan is 1, the first switching transistor M1, the second switching transistor M2, and the third switching transistor M3 are all turned off; since EM1 is 1, the fourth switching transistor M4 is turned off; since EM2 is equal to 1, both the fifth switching transistor M5 and the sixth switching transistor M6 are turned off.
The latter period, Scan 1, EM1 0, and EM2 1. Since Scan is 1, the first switching transistor M1, the second switching transistor M2, and the third switching transistor M3 are all turned off; since EM2 is 1, both the fifth switching transistor M5 and the sixth switching transistor M6 are turned off; since the EM1 is 0, the fourth switching transistor M4 is turned on. The turned-on fourth switching transistor M4 applies the voltage V of the first power source terminal VDDddIs supplied to the second node B, so that the voltage at the second node B, i.e. the voltage at the second terminal of the capacitor, is Vdd. The turned-off third switching transistor M3 disconnects the Data signal terminal Data from the first node a, and thus the first node a is in a floating state; because the first node a is in a floating state, according to the capacitive coupling principle, in order to keep the voltage difference between the two ends of the capacitor to be: vData-VInt+VthSo that the voltage at the first terminal of the capacitor C is set by VDataJump to VData+Vdd-VInt+Vth。
In stage T4, Scan is 1, EM1 is 0, and EM2 is 0.
Since Scan is 1, the first switching transistor M1, the second switching transistor M2, and the third switching transistor M3 are all turned off; since EM2 is 0, both the fifth switching transistor M5 and the sixth switching transistor M6 are turned on; since EM1 is 0, it is not necessary to provide any additional power sourceThe fourth switching transistor M4 is turned on. The turned-on fifth switching transistor M5 switches the voltage at the first node A, i.e. the voltage V at the first end of the capacitor Data+Vdd-VInt+VthSupplied to the second node B, and thus the gate G of the driving transistor M0 has a voltage VData+Vdd-VInt+Vth(ii) a The turned-on fourth switching transistor M4 applies the voltage V of the first power source terminal VDDddIs supplied to the second node B, and thus the source S of the driving transistor M0 has a voltage Vdd(ii) a Since the driving transistor M0 is in saturation, the operating current I flowing through the driving transistor M0 is known from the current characteristics in saturationLSatisfies the formula: i isL＝K(VGS-Vth)2＝K[(VData+Vdd-VInt+Vth-Vdd)-Vth]2＝K(VData-VInt)2Wherein V isGSIs the gate-source voltage of the driving transistor M0; k is a structural parameter, and the value is relatively stable in the same structure and can be calculated as a constant. From the above formula, the current of the driving transistor M0 in saturation state is only equal to the voltage V of the initial signal terminal IntIntAnd voltage V of Data signal terminal DataDataIn relation to the threshold voltage V of the driving transistor M0thAnd a voltage V of the first power source terminal VDDddIrrelative, the threshold voltage V caused by the process of the driving transistor M0 and long-term operation is solvedthDrift and the influence of IR Drop on the current flowing through the light emitting device, so that the operating current of the light emitting device L is kept stable, thereby ensuring the normal operation of the light emitting device L.
Example II,
As shown in fig. 2b, the driving transistor M0 is a P-type transistor, and all the switching transistors are N-type switching transistors; each switching transistor is switched on under the action of a high level and is switched off under the action of a low level; the corresponding input timing diagram is shown in fig. 3 b. Specifically, four phases of T1, T2, T3, and T4 in the input timing diagram shown in FIG. 3b are selected.
In stage T1, Scan is 1, EM1 is 1, and EM2 is 0.
Since Scan is 1, the first switching transistor M1, the second switching transistor M2, and the third switching transistor M3 are all turned on; since EM1 is 1, the fourth switching transistor M4 is turned on; since EM2 is 0, both the fifth switching transistor M5 and the sixth switching transistor M6 are turned off. The turned-on third switching transistor M3 converts the voltage V of the Data signal terminal Data intoDataIs supplied to a first node A, i.e. a first terminal of a capacitor C, so that the voltage at the first terminal of the capacitor C is VData(ii) a The turned-on fourth switching transistor M4 applies the voltage V of the first power source terminal VDDddIs provided to the second node B, i.e. the source S of the driving transistor M0 and the second terminal of the capacitor C, so that the voltage at the second terminal of the capacitor C is Vdd(ii) a The turned-on first switching transistor M1 switches the voltage V of the initial signal terminal IntIntA gate G provided to the driving transistor M0; the turned-on second switching transistor M2 applies the voltage V of the second power source terminal VEEeeIs provided to the drain D of the driving transistor M0 to control the driving transistor M0 to be in a diode state to control the driving transistor M0 to have a stable current flowing from its source to its drain. But since the sixth switching transistor M6 is turned off, the light emitting device L does not emit light.
In stage T2, Scan is 1, EM1 is 0, and EM2 is 0.
Since Scan is 1, the first switching transistor M1, the second switching transistor M2, and the third switching transistor M3 are all turned on; since EM2 is 0, both the fifth switching transistor M5 and the sixth switching transistor M6 are turned off; since EM1 is 0, the fourth switching transistor M4 is turned off. The turned-on third switching transistor M3 converts the voltage V of the Data signal terminal Data intoDataIs supplied to a first node A, i.e. a first terminal of a capacitor C, so that the voltage at the first terminal of the capacitor C is VData(ii) a The turned-off fourth switching transistor M4 disconnects the first power terminal VDD from the second node B, and thus the second node B is in a floating state; the turned-on first switching transistor M1 switches the voltage V of the initial signal terminal IntIntSupplied to the drive transistorGate G of M0; the turned-on second switching transistor M2 applies the voltage V of the second power source terminal VEEeeThe drain D of the driving transistor M0 is provided to control the driving transistor M0 to be in a diode state since the gate-source voltage of the driving transistor M0 is greater than the threshold voltage V thereofthTurning on the drive transistor M0; since the driving transistor M0 is in the diode state, the capacitor C is discharged through the driving transistor M0 until the voltage of the second node B, i.e., the voltage of the second terminal of the capacitor, becomes: v Int-VthWhen the driving transistor M0 is turned off, the capacitor C stops discharging, so the voltage difference between the two ends of the capacitor is: vData-VInt+Vth。
In stage T3, Scan is 0, EM1 is 0, and EM2 is 0.
Since Scan is 0, the first switching transistor M1, the second switching transistor M2, and the third switching transistor M3 are all turned off; since EM1 is 0, the fourth switching transistor M4 is turned off; since EM2 is 0, both the fifth switching transistor M5 and the sixth switching transistor M6 are turned off.
In the latter period, Scan is 0, EM1 is 1, and EM2 is 0.
Since Scan is 0, the first switching transistor M1, the second switching transistor M2, and the third switching transistor M3 are all turned off; since EM2 is 0, both the fifth switching transistor M5 and the sixth switching transistor M6 are turned off; since EM1 is equal to 1, the fourth switching transistor M4 is turned on. The turned-on fourth switching transistor M4 applies the voltage V of the first power source terminal VDDddIs supplied to the second node B, so that the voltage at the second node B, i.e. the voltage at the second terminal of the capacitor, is Vdd. The turned-off third switching transistor M3 disconnects the Data signal terminal Data from the first node a, and thus the first node a is in a floating state; because the first node a is in a floating state, according to the capacitive coupling principle, in order to keep the voltage difference between the two ends of the capacitor to be: v Data-VInt+VthSo that the voltage at the first terminal of the capacitor C is set by VDataJump to VData+Vdd-VInt+Vth。
In stage T4, Scan is 0, EM1 is 1, and EM2 is 1.
Since Scan is 0, the first switching transistor M1, the second switching transistor M2, and the third switching transistor M3 are all turned off; since EM2 is 1, both the fifth switching transistor M5 and the sixth switching transistor M6 are turned on; since EM1 is equal to 1, the fourth switching transistor M4 is turned on. The turned-on fifth switching transistor M5 switches the voltage at the first node A, i.e. the voltage V at the first end of the capacitorData+Vdd-VInt+VthSupplied to the second node B, and thus the gate G of the driving transistor M0 has a voltage VData+Vdd-VInt+Vth(ii) a The turned-on fourth switching transistor M4 applies the voltage V of the first power source terminal VDDddIs supplied to the second node B, and thus the source S of the driving transistor M0 has a voltage Vdd(ii) a Since the driving transistor M0 is in saturation, the operating current I flowing through the driving transistor M0 is known from the current characteristics in saturationLSatisfies the formula: i isL＝K(VGS-Vth)2＝K[(VData+Vdd-VInt+Vth-Vdd)-Vth]2＝K(VData-VInt)2Wherein V isGSIs the gate-source voltage of the driving transistor M0; k is a structural parameter, and the value is relatively stable in the same structure and can be calculated as a constant. From the above formula, the current of the driving transistor M0 in saturation state is only equal to the voltage V of the initial signal terminal IntIntAnd voltage V of Data signal terminal Data DataIn relation to the threshold voltage V of the driving transistor M0thAnd a voltage V of the first power source terminal VDDddIrrelative, the threshold voltage V caused by the process of the driving transistor M0 and long-term operation is solvedthDrift and the influence of IR Drop on the current flowing through the light emitting device, so that the operating current of the light emitting device L is kept stable, thereby ensuring the normal operation of the light emitting device L.
In the first and second embodiments of the present invention, since a stable current passes through the driving transistor at the stage T1, the generation of the hysteresis effect is avoided, the response time of the driving transistor is improved, and the dark state luminance can be reduced.
Based on same utility model design, the embodiment of the utility model provides a still provide one the utility model provides an above-mentioned any kind of pixel circuit's that provide drive method, as shown in fig. 4, include: a first stage, a second stage, a third stage and a fourth stage; wherein,
s401, in the first stage, a data writing module provides a signal of a data signal end to a first node under the control of a scanning signal end; the power supply voltage control module supplies a signal of a first power supply end to a second node under the control of the first light-emitting control signal end; the storage module is charged under the common control of the signal of the first node and the signal of the second node; the conduction control module controls the driving transistor to be in a diode state through the initial signal end and the second power end;
S402, in the second stage, the data writing module provides the signal of the data signal end to the first node under the control of the scanning signal end; the conduction control module controls the driving transistor to be in a diode state through the initial signal end and the second power end; the storage module discharges under the common control of the signal of the first node and the signal of the second node;
s403, in the third stage, the power supply voltage control module provides the signal of the first power supply end to the second node under the control of the first light-emitting control signal end; the storage module keeps the voltage difference between the first node and the second node stable when the first node is in a floating state;
s404, in the fourth stage, the power supply voltage control module provides the signal of the first power supply end to the second node under the control of the first light-emitting control signal end; the light-emitting control module conducts the first node and the grid electrode of the driving transistor and conducts the drain electrode of the driving transistor and the light-emitting device under the control of the second light-emitting control signal end so as to control the driving transistor to drive the light-emitting device to emit light.
The embodiment of the utility model provides an above-mentioned drive method can make the luminous operating current of drive transistor drive luminescent device in the pixel circuit only relevant with the voltage of data signal end and the voltage of initial signal end, and is irrelevant with the threshold voltage of drive transistor and the voltage of first power end, can avoid drive transistor's threshold voltage and IR Drop to the influence of the operating current who flows through luminescent device to make the luminous operating current of drive luminescent device remain stable, and then improve the homogeneity of the regional picture luminance of display in the display device.
Based on the same utility model discloses think, the embodiment of the utility model provides an organic electroluminescent display panel is still provided, include: the embodiment of the utility model provides an arbitrary kind of pixel circuit of above-mentioned. The principle of the organic electroluminescent display panel for solving the problems is similar to that of the pixel circuit, so the implementation of the organic electroluminescent display panel can refer to the implementation of the pixel circuit, and repeated details are not repeated.
Based on same utility model the design, the embodiment of the utility model provides a still provide a display device, include the embodiment of the utility model provides an above-mentioned organic electroluminescent display panel. The display device may be: any product or component with 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. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should be taken as limitations of the present invention. The implementation of the display device can refer to the above embodiments of the pixel circuit, and repeated descriptions are omitted.
The embodiment of the utility model provides a pixel circuit, organic electroluminescent display panel and display device, include: the device comprises a data writing module, a power supply voltage control module, a conduction control module, a storage module, a light-emitting control module, a driving transistor and a light-emitting device; the data writing module is used for providing a signal of the data signal end to the first node under the control of the scanning signal end; the power supply voltage control module is used for providing a signal of a first power supply end to a second node under the control of the first light-emitting control signal end; the conduction control module is used for controlling the driving transistor to be in a diode state through the initial signal end and the second power end; the storage module is used for charging or discharging under the common control of the signal of the first node and the signal of the second node, and keeping the voltage difference between the first node and the second node stable when the first node is in a floating state; the light-emitting control module is used for conducting the first node and the grid electrode of the driving transistor and conducting the drain electrode of the driving transistor and the light-emitting device under the control of the second light-emitting control signal end so as to control the driving transistor to drive the light-emitting device to emit light. The embodiment of the utility model provides a pixel circuit, organic electroluminescent display panel and display device, through above-mentioned five modules and drive transistor mutually support, the luminous operating current of drive transistor drive luminescent device in can making pixel circuit only is relevant with the voltage of data signal end and the voltage of initial signal end, and the voltage with drive transistor's threshold voltage and first power end is irrelevant, can avoid drive transistor's threshold voltage and the influence of IR Drop to the operating current who flows luminescent device, thereby make the luminous operating current of drive luminescent device remain stable, and then improve the homogeneity of the regional picture luminance of demonstration in the display device.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (12)
1. A pixel circuit, comprising: the device comprises a data writing module, a power supply voltage control module, a conduction control module, a storage module, a light-emitting control module, a driving transistor and a light-emitting device; wherein,
the first end of the data writing module is connected with the scanning signal end, the second end of the data writing module is connected with the data signal end, and the third end of the data writing module is connected with the first node; the data writing module is used for providing the signal of the data signal end to the first node under the control of the scanning signal end;
the first end of the power supply voltage control module is connected with the first light-emitting control signal end, the second end of the power supply voltage control module is connected with the first power supply end, and the third end of the power supply voltage control module is respectively connected with the second node and the source electrode of the driving transistor; the power supply voltage control module is used for providing a signal of the first power supply end to the second node under the control of the first lighting control signal end;
the first end of the conduction control module is connected with the initial signal end, the second end of the conduction control module is connected with the second power supply end, the third end of the conduction control module is connected with the grid electrode of the driving transistor, and the fourth end of the conduction control module is connected with the drain electrode of the driving transistor; the conduction control module is used for controlling the driving transistor to be in a diode state through the initial signal end and the second power end;
The first end of the storage module is connected with the first node, and the second end of the storage module is connected with the second node; the storage module is used for charging or discharging under the common control of the signal of the first node and the signal of the second node, and keeping the voltage difference between the first node and the second node stable when the first node is in a floating state;
the first end of the light-emitting control module is connected with a second light-emitting control signal end, the second end of the light-emitting control module is connected with the first node, the third end of the light-emitting control module is connected with the grid electrode of the driving transistor, the fourth end of the light-emitting control module is connected with the drain electrode of the driving transistor, the fifth end of the light-emitting control module is connected with the first end of the light-emitting device, and the second end of the light-emitting device is connected with the second power supply end; the light-emitting control module is used for conducting the first node and the grid electrode of the driving transistor and conducting the drain electrode of the driving transistor and the light-emitting device under the control of the second light-emitting control signal end so as to control the driving transistor to drive the light-emitting device to emit light.
2. The pixel circuit of claim 1, wherein the conduction control module comprises: the first conduction control submodule and the second conduction control submodule; wherein,
The first end of the first conduction control submodule is connected with the scanning signal end, the second end of the first conduction control submodule is connected with the initial signal end, and the third end of the first conduction control submodule is connected with the grid electrode of the driving transistor; the first conduction control submodule is used for providing a signal of the initial signal end to the grid electrode of the driving transistor under the control of the scanning signal end;
the first end of the second conduction control submodule is connected with the scanning signal end, the second end of the second conduction control submodule is connected with the second power supply end, and the third end of the second conduction control submodule is connected with the drain electrode of the driving transistor; the second conduction control submodule is used for supplying the signal of the second power supply end to the drain electrode of the driving transistor under the control of the scanning signal end.
3. The pixel circuit of claim 2, wherein the first conduction control submodule comprises: a first switching transistor; wherein,
the grid electrode of the first switch transistor is connected with the scanning signal end, the source electrode of the first switch transistor is connected with the initial signal end, and the drain electrode of the first switch transistor is connected with the grid electrode of the driving transistor.
4. The pixel circuit of claim 2, wherein the second conduction control submodule comprises: a second switching transistor; wherein,
And the grid electrode of the second switch transistor is connected with the scanning signal end, the source electrode of the second switch transistor is connected with the second power supply end, and the drain electrode of the second switch transistor is connected with the drain electrode of the driving transistor.
5. The pixel circuit of claim 1, wherein the data write module comprises: a third switching transistor; wherein,
and the grid electrode of the third switching transistor is connected with the scanning signal end, the source electrode of the third switching transistor is connected with the data signal end, and the drain electrode of the third switching transistor is connected with the first node.
6. The pixel circuit according to claim 1, wherein the power supply voltage control module comprises: a fourth switching transistor; wherein,
and the grid electrode of the fourth switching transistor is connected with the first light-emitting control signal end, the source electrode of the fourth switching transistor is connected with the first power supply end, and the drain electrode of the fourth switching transistor is connected with the second node.
7. The pixel circuit according to claim 1, wherein the light emission control module comprises: a fifth switching transistor and a sixth switching transistor; wherein,
a grid electrode of the fifth switching transistor is connected with the second light-emitting control signal end, a source electrode of the fifth switching transistor is connected with the first node, and a drain electrode of the fifth switching transistor is connected with a grid electrode of the driving transistor;
And the grid electrode of the sixth switching transistor is connected with the second light-emitting control signal end, the source electrode of the sixth switching transistor is connected with the drain electrode of the driving transistor, and the drain electrode of the sixth switching transistor is connected with the first end of the light-emitting device.
8. The pixel circuit of claim 1, wherein the storage module comprises: a capacitor; wherein,
the first end of the capacitor is connected with the first node, and the second end of the capacitor is connected with the second node.
9. The pixel circuit according to any of claims 1-8, wherein the drive transistor is a P-type transistor.
10. A pixel circuit as claimed in claim 9, wherein all of the switching transistors are P-type transistors.
11. An organic electroluminescent display panel comprising the pixel circuit according to any one of claims 1 to 10.
12. A display device comprising the organic electroluminescent display panel according to claim 11.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106205491A (en) * | 2016-07-11 | 2016-12-07 | 京东方科技集团股份有限公司 | A kind of image element circuit, its driving method and relevant apparatus |
| WO2022110247A1 (en) * | 2020-11-30 | 2022-06-02 | 京东方科技集团股份有限公司 | Drive circuit, driving method thereof, and display device |
| CN114783370A (en) * | 2022-05-05 | 2022-07-22 | 武汉天马微电子有限公司 | Pixel circuit, display panel and display device |
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2016
- 2016-07-11 CN CN201620727845.5U patent/CN205810345U/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106205491A (en) * | 2016-07-11 | 2016-12-07 | 京东方科技集团股份有限公司 | A kind of image element circuit, its driving method and relevant apparatus |
| WO2018010511A1 (en) * | 2016-07-11 | 2018-01-18 | Boe Technology Group Co., Ltd. | Electronic circuit and driving method, display panel, and display apparatus |
| CN106205491B (en) * | 2016-07-11 | 2018-09-11 | 京东方科技集团股份有限公司 | A kind of pixel circuit, its driving method and relevant apparatus |
| WO2022110247A1 (en) * | 2020-11-30 | 2022-06-02 | 京东方科技集团股份有限公司 | Drive circuit, driving method thereof, and display device |
| US12327521B2 (en) | 2020-11-30 | 2025-06-10 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Drive circuit, driving method therefor, and display device |
| CN114783370A (en) * | 2022-05-05 | 2022-07-22 | 武汉天马微电子有限公司 | Pixel circuit, display panel and display device |
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