CN108682385B - Pixel circuit, pixel driving method and display device - Google Patents
Pixel circuit, pixel driving method and display device Download PDFInfo
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- CN108682385B CN108682385B CN201810832712.8A CN201810832712A CN108682385B CN 108682385 B CN108682385 B CN 108682385B CN 201810832712 A CN201810832712 A CN 201810832712A CN 108682385 B CN108682385 B CN 108682385B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The invention provides a pixel circuit, a pixel driving method and a display device. The pixel circuit comprises a light-emitting element, a pixel circuit and a control circuit, wherein the light-emitting element comprises a data writing unit, an energy storage unit, a driving unit, a light-emitting control unit and a short-circuit protection unit; the light-emitting control unit is used for conducting the connection between the light-emitting node and the first pole of the light-emitting element and conducting the connection between the first pole of the light-emitting element and the control end of the short-circuit protection unit under the control of the light-emitting control line in a light-emitting stage; the short-circuit protection unit is controlled by the control end of the short-circuit protection unit to switch on or off the connection between the second pole of the light-emitting element and the second voltage end. The present invention can perform automatic short-circuit protection when a short circuit occurs between a first pole of a light-emitting element and a second pole of the light-emitting element.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a pixel circuit, a pixel driving method, and a display device.
Background
The micro LED (micro light emitting diode) device has high efficiency and strong water and oxygen resistance, and is expected to become the next generation of mainstream display technology. However, in a display device including the micro leds, the substrate on which the micro leds are grown is not the same substrate as the final display substrate, and transfer is involved in the process. After transfer, electrical connection with the backplane is required. In the flip-chip device, the electrical connection adopts a cathode and anode silver paste dispensing process, and the open circuit of the cathode and the anode silver paste is easy to occur in the process. In the vertical device, after the transfer, the anode or cathode is electrically connected to the back plate, and then the whole cathode or anode is required to be made continuously, if the transfer is lost, the short circuit between the cathode and the anode is easy to occur. In the micro LED display device, after the short circuit of the anode and the cathode occurs, not only the sub-pixel can form a dark spot, but also the adjacent pixel points can be influenced.
Disclosure of Invention
The invention mainly aims to provide a pixel circuit, a pixel driving method and a display device, and solves the problem that the conventional display device cannot perform automatic short-circuit protection when a first pole of a light-emitting element and a second pole of the light-emitting element are short-circuited.
In order to achieve the above object, the present invention provides a pixel circuit including a light emitting element including a data writing unit, an energy storage unit, a driving unit, a light emission control unit, and a short-circuit protection unit, wherein,
the data writing unit is respectively connected with the grid line, the data line and the control end of the driving unit and is used for controlling the data voltage on the data line to be written into the control end of the driving unit under the control of the grid line;
the energy storage unit is connected with the control end of the driving unit and is used for maintaining the potential of the control end of the driving unit;
the first end of the driving unit is connected with the first voltage end, and the second end of the driving unit is connected with the light-emitting node; the driving unit is used for controlling connection or disconnection between the first voltage end and the light-emitting node under the control of the control end of the driving unit;
the light-emitting control unit is respectively connected with a light-emitting control line, the light-emitting node, the first pole of the light-emitting element and the control end of the short-circuit protection unit, and is used for conducting the connection between the light-emitting node and the first pole of the light-emitting element and conducting the connection between the first pole of the light-emitting element and the control end of the short-circuit protection unit under the control of the light-emitting control line in a light-emitting stage;
the first end of the short-circuit protection unit is connected with the second pole of the light-emitting element, the second end of the short-circuit protection unit is connected with the second voltage end, and the short-circuit protection unit is used for conducting or breaking connection between the second pole of the light-emitting element and the second voltage end under the control of the control end of the short-circuit protection unit.
In an implementation, the short-circuit protection unit is specifically configured to, in a light emitting stage, turn on a connection between the second pole of the light emitting element and the second voltage terminal under the control of the control terminal of the short-circuit protection unit when there is no short circuit between the first pole of the light emitting element and the second pole of the light emitting element, and turn off the connection between the second pole of the light emitting element and the second voltage terminal under the control of the control terminal of the short-circuit protection unit when there is a short circuit between the first pole of the light emitting element and the second pole of the light emitting element.
In practice, the short-circuit protection unit includes a short-circuit protection transistor;
the grid of the short-circuit protection transistor is the control end of the short-circuit protection unit, the first pole of the short-circuit protection transistor is the first end of the short-circuit protection unit, and the second pole of the short-circuit protection transistor is the second end of the short-circuit protection unit.
In practice, the short-circuit protection transistor is an n-type transistor.
In practice, the light emission control unit includes a first light emission control transistor and a second light emission control transistor;
a gate of the first light emission control transistor is connected to the light emission control line, a first pole of the first light emission control transistor is connected to the light emission node, and a second pole of the first light emission control transistor is connected to the first pole of the light emitting element;
the gate of the second light-emitting control transistor is connected to the light-emitting control line, the first pole of the second light-emitting control transistor is connected to the first pole of the light-emitting element, and the second pole of the light-emitting control transistor is connected to the control end of the short-circuit protection unit.
In implementation, the data writing unit comprises a data writing transistor, the energy storage unit comprises a storage capacitor, and the driving unit comprises a driving transistor;
the gate of the driving transistor is the control end of the driving unit, the first pole of the driving transistor is the first end of the driving unit, and the second pole of the driving transistor is the second end of the driving unit;
the grid electrode of the data writing transistor is connected with the grid line, the first pole of the data writing transistor is connected with the data line, and the second pole of the data writing transistor is connected with the grid electrode of the driving transistor;
the first end of the storage capacitor is connected with the grid electrode of the driving transistor, and the second end of the storage capacitor is connected with the first voltage end.
In practice, the light-emitting element is a micro light-emitting diode;
the anode of the micro light-emitting diode is the first pole of the light-emitting element, and the cathode of the micro light-emitting diode is the second pole of the light-emitting element.
The invention also provides a pixel driving method, which is applied to the pixel circuit and comprises the following steps:
in a data writing stage, the data writing unit controls to write data voltage on the data line into the control end of the driving unit under the control of the grid line, the energy storage unit maintains the potential of the control end of the driving unit, and the light-emitting control unit disconnects the connection between the light-emitting node and the first pole of the light-emitting element and disconnects the connection between the first pole of the light-emitting element and the control end of the short-circuit protection unit under the control of the light-emitting control line;
in a light emitting stage, the light emitting control unit conducts the connection between the light emitting node and the first pole of the light emitting element and conducts the connection between the first pole of the light emitting element and the control end of the short-circuit protection unit under the control of the light emitting control line, and the short-circuit protection unit conducts or breaks the connection between the second pole of the light emitting element and the second voltage end under the control of the control end of the short-circuit protection unit.
In practice, the step of turning on or off the connection between the second electrode of the light emitting element and the second voltage terminal by the short-circuit protection unit under the control of the control terminal of the short-circuit protection unit specifically includes:
when the first pole of the light-emitting element and the second pole of the light-emitting element are not short-circuited, the short-circuit protection unit conducts the connection between the second pole of the light-emitting element and the second voltage end under the control of the control end of the short-circuit protection unit;
when the first pole of the light-emitting element and the second pole of the light-emitting element are in short circuit, the short-circuit protection unit disconnects the second pole of the light-emitting element from the second voltage end under the control of the control end of the short-circuit protection unit.
The invention also provides a display device which comprises the pixel circuit.
Compared with the prior art, the pixel circuit, the pixel driving method and the display device are additionally provided with the short-circuit protection unit, the connection between the first pole of the light-emitting element and the control end of the short-circuit protection unit can be conducted in the light-emitting stage, if the first pole of the light-emitting element and the second pole of the light-emitting element are short-circuited, the short-circuit protection unit can disconnect the second pole of the light-emitting element and the second voltage end under the control of the control end of the short-circuit protection unit, so that the second voltage input by the second voltage end cannot be transmitted to the second pole of the light-emitting element, and automatic short-circuit protection is formed; when the light emitting element is normal (i.e. the first pole of the light emitting element and the second pole of the light emitting element are not short-circuited), the short-circuit protection unit is controlled by the control terminal to connect the second pole of the light emitting element and the second voltage terminal, and the driving unit drives the light emitting element to emit light.
Drawings
Fig. 1 is a structural diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a first embodiment of a pixel circuit according to the present invention;
FIG. 3 is a circuit diagram of a second embodiment of a pixel circuit according to the present invention;
FIG. 4 is a circuit diagram of a third embodiment of a pixel circuit according to the present invention;
fig. 5 is a timing diagram illustrating the operation of a pixel circuit according to a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The transistors used in all embodiments of the present invention may be thin film transistors or field effect transistors or other devices having the same characteristics. In the embodiment of the present invention, in order to distinguish two poles of the transistor except for the gate, one of the two poles is referred to as a first pole, and the other pole is referred to as a second pole. In practical operation, the first pole may be a drain, and the second pole may be a source; alternatively, the first pole may be a source and the second pole may be a drain.
As shown in fig. 1, the pixel circuit according to the embodiment of the present invention includes a light emitting element EL, which includes a data writing unit 11, an energy storage unit 12, a driving unit 13, a light emission control unit 14, and a short-circuit protection unit 15, wherein,
the Data writing unit 11 is respectively connected to the Gate line Gate, the Data line Data and the control end of the driving unit 13, and is configured to control writing of the Data voltage on the Data line Data into the control end of the driving unit 13 under the control of the Gate line Gate;
the energy storage unit 12 is connected to the control end of the driving unit 13, and is configured to maintain the potential of the control end of the driving unit 13;
a first end of the driving unit 13 is connected to the first voltage end, and a second end of the driving unit 13 is connected to the light emitting node DE; the driving unit 13 is configured to control to turn on or off the connection between the first voltage terminal and the light emitting node DE under the control of the control terminal of the driving unit; the first voltage end is used for inputting a first voltage V1;
the light-emitting control unit 14 is respectively connected to a light-emitting control line EM, the light-emitting node DE, the first pole of the light-emitting element EL, and the control end of the short-circuit protection unit 15, and is configured to, in a light-emitting phase, conduct, under the control of the light-emitting control line EM, the connection between the light-emitting node DE and the first pole of the light-emitting element EL, and conduct, under the control of the light-emitting control line EM, the connection between the first pole of the light-emitting element EL and the control end of the short-circuit protection unit 15;
a first end of the short-circuit protection unit 15 is connected to the second electrode of the light-emitting element EL, a second end of the short-circuit protection unit 15 is connected to a second voltage end, and the short-circuit protection unit is configured to turn on or off the connection between the second electrode of the light-emitting element EL and the second voltage end under the control of a control end of the short-circuit protection unit; the second voltage terminal is used for inputting a second voltage V2.
In practical operation, the first voltage V1 may be a high voltage VDD, and the second voltage V2 may be a low voltage VSS, but not limited thereto.
The pixel circuit according to the embodiment of the present invention is additionally provided with the light-emitting control unit 14 and the short-circuit protection unit 15, so that the connection between the first pole of the light-emitting element and the control end of the short-circuit protection unit 15 can be turned on in the light-emitting stage, if the first pole of the light-emitting element and the second pole of the light-emitting element are short-circuited, the short-circuit protection unit 15 will disconnect the connection between the second pole of the light-emitting element EL and the second voltage end under the control of the control end, and thus the second voltage input by the second voltage end cannot be transmitted to the second pole of the light-emitting element EL, thereby forming automatic short-circuit protection; when the light emitting element EL is normal (i.e. the first pole of the light emitting element EL and the second pole of the light emitting element EL are not short-circuited), the short-circuit protection unit 15 is controlled by the control terminal thereof to connect the second pole of the light emitting element EL to the second voltage terminal, and the driving unit 13 drives the light emitting element EL to emit light.
In practical operation, the short-circuit protection unit 15 is specifically configured to, in a light emitting phase, when there is no short circuit between the first pole of the light emitting element EL and the second pole of the light emitting element EL, under the control of the control terminal of the short-circuit protection unit 15, turn on the connection between the second pole of the light emitting element EL and the second voltage terminal to perform automatic short-circuit protection;
the short-circuit protection unit 15 is further configured to disconnect the second pole of the light-emitting element EL from the second voltage terminal under the control of the control terminal of the short-circuit protection unit 15 when the first pole of the light-emitting element EL and the second pole of the light-emitting element EL are short-circuited, so that the light-emitting element EL emits light.
Specifically, the short-circuit protection unit may include a short-circuit protection transistor;
the grid of the short-circuit protection transistor is the control end of the short-circuit protection unit, the first pole of the short-circuit protection transistor is the first end of the short-circuit protection unit, and the second pole of the short-circuit protection transistor is the second end of the short-circuit protection unit.
In a specific implementation, the short-circuit protection transistor may be an n-type transistor.
As shown in fig. 2, on the basis of the embodiment of the pixel circuit shown in fig. 1, in the first specific embodiment of the pixel circuit according to the present invention, the short-circuit protection unit 15 includes a short-circuit protection transistor T5, the first voltage terminal is a high-voltage input terminal for inputting a high voltage VDD, and the second voltage terminal is a low-voltage input terminal for inputting a low voltage VSS;
a gate of the short-circuit protection transistor T5 is connected to the light emission control unit 14, a drain of the short-circuit protection transistor T5 is connected to the second pole of the light emitting element EL, and a source of the short-circuit protection transistor T5 is connected to the low voltage input terminal of the input low voltage VSS;
the short-circuit protection transistor T5 is an n-type transistor.
When the first embodiment of the pixel circuit of the present invention operates, in the light emitting stage, when the first pole of the light emitting element EL and the second pole of the light emitting element EL are short-circuited, the gate of T5 is turned on and T5 is turned off to disconnect the second pole of the light emitting element EL from the low voltage input terminal, so as to automatically perform short-circuit protection;
in the light emitting stage, when the light emitting element EL normally operates, and the first pole of the light emitting element EL and the second pole of the light emitting element EL are not short-circuited, the gate of T5 is turned on, and T5 is turned on to turn on the connection between the second pole of the light emitting element EL and the low voltage input terminal, so as to perform normal display.
In practical operation, the light-emitting control unit is further configured to disconnect the light-emitting node from the first pole of the light-emitting element and disconnect the first pole of the light-emitting element from the control terminal of the short-circuit protection unit under the control of the light-emitting control line in a data writing stage.
In a specific implementation, the light emission control unit may include a first light emission control transistor and a second light emission control transistor;
a gate of the first light emission control transistor is connected to the light emission control line, a first pole of the first light emission control transistor is connected to the light emission node, and a second pole of the first light emission control transistor is connected to the first pole of the light emitting element;
the gate of the second light-emitting control transistor is connected to the light-emitting control line, the first pole of the second light-emitting control transistor is connected to the first pole of the light-emitting element, and the second pole of the light-emitting control transistor is connected to the control end of the short-circuit protection unit.
As shown in fig. 3, on the basis of the first specific embodiment of the pixel circuit shown in fig. 2, in the second specific embodiment of the pixel circuit according to the present invention, the light emission control unit 14 includes a first light emission control transistor T3 and a second light emission control transistor T4;
a gate of the first light emission control transistor T3 is connected to the light emission control line EM, a source of the first light emission control transistor T3 is connected to the light emission node DE, and a drain of the first light emission control transistor is connected to a first pole of the light emitting element EL;
the gate of the second light emission controlling transistor T4 is connected to the light emission control line EM, the source of the second light emission controlling transistor T4 is connected to the first pole of the light emitting element EL, and the second pole of the light emission controlling transistor T4 is connected to the gate of the short-circuit protection transistor T5.
In the second embodiment of the pixel circuit shown in fig. 3, T3 and T5 are both p-type transistors, but not limited thereto.
In the second embodiment of the pixel circuit shown in fig. 3, during the data writing phase, the EM outputs high level, and both T3 and T4 are turned off; in the light emitting phase, the EM outputs a low level, and both T3 and T4 are turned on to turn on the connection between the light emitting node DE and the first pole of the light emitting element EL and turn on the connection between the first pole of the light emitting element EL and the gate of T5.
Specifically, the data writing unit may include a data writing transistor, the energy storage unit may include a storage capacitor, and the driving unit may include a driving transistor;
the gate of the driving transistor is the control end of the driving unit, the first pole of the driving transistor is the first end of the driving unit, and the second pole of the driving transistor is the second end of the driving unit;
the grid electrode of the data writing transistor is connected with the grid line, the first pole of the data writing transistor is connected with the data line, and the second pole of the data writing transistor is connected with the grid electrode of the driving transistor;
the first end of the storage capacitor is connected with the grid electrode of the driving transistor, and the second end of the storage capacitor is connected with the first voltage end.
In specific implementation, the light-emitting element can be a micro light-emitting diode;
the anode of the micro light-emitting diode is the first pole of the light-emitting element, and the cathode of the micro light-emitting diode is the second pole of the light-emitting element.
In practical applications, the light emitting element may also be an organic light emitting diode or other types of light emitting elements, and the selection of the light emitting element is not limited herein.
As shown in fig. 4, a third embodiment of the pixel circuit of the present invention includes a Micro-led, a data writing unit 11, an energy storage unit 12, a driving unit 13, a light-emitting control unit 14, and a short-circuit protection unit 15, wherein,
the data writing unit 11 comprises a data writing transistor T1, the energy storage unit 12 comprises a storage capacitor C, and the driving unit 13 comprises a driving transistor T2; the light emission control unit 14 includes a first light emission control transistor T3 and a second light emission control transistor T4; the short-circuit protection unit 15 includes a short-circuit protection transistor T5;
the Gate of the Data writing transistor T1 is connected to the Gate line Gate, the source of the Data writing transistor T1 is connected to the Data line Data, and the drain of the Data writing transistor T1 is connected to the Gate of the driving transistor T2;
a first end of the storage capacitor C is connected to the gate of the driving transistor T2, and a second end of the storage capacitor C is connected to a high voltage input terminal to which a high voltage VDD is input;
the source of the driving transistor T2 is connected to the high voltage input terminal, and the drain of the driving transistor T2 is connected to the source of the first light emission control transistor T3;
the grid electrode of the first light-emitting control transistor T3 is connected with a light-emitting control line EM, and the drain electrode of the first light-emitting control transistor T3 is connected with the anode electrode of the Micro-LED;
a gate of the second light emission controlling transistor T4 is connected to the light emission control line EM, a source of the second light emission controlling transistor T4 is connected to an anode of the Micro-led, and a drain of the second light emission controlling transistor T4 is connected to a gate of the short protection transistor T5;
the drain of the short-circuit protection transistor T5 is connected to the cathode of the Micro-LED, and the source of the short-circuit protection transistor T5 is connected to the low voltage input terminal for inputting the low voltage VSS.
In the third specific embodiment of the pixel circuit shown in fig. 4, T1, T2, T3, and T4 are all p-type transistors, and T5 is an n-type transistor.
As shown in fig. 5, in operation of the third embodiment of the pixel current according to the present invention,
in the Data writing phase T1, Gate outputs low level, EM outputs high level, T1 is turned on, T3, T4 and T5 are all turned off, the Data voltage on Data is written into the Gate of T2, the Data voltage is stored to C;
in a light-emitting stage T2, a Gate outputs a high level, an EM outputs a low level, a T1 is turned off, T3 and T4 are both turned on, C maintains the potential of a grid of T2, T2 is turned on, when Micro-led normally works, the anode of the Micro-led is not in short circuit with the cathode of the Micro-led, the potential of the anode of the Micro-led is a high level, the grid of T5 is connected to a high level, T5 is turned on to connect the connection between the cathode of the Micro-led and a low-voltage input end, and T2 drives the Micro-led to emit light; when the anode of the Micro-led is in short circuit with the cathode of the Micro-led, the grid of the T5 is connected with a low level, the T5 is switched off, so that the connection between the cathode of the Micro-led and the low-voltage input end is disconnected, a path from the high-voltage input end to the low-voltage input end through the T2, the T3, the Micro-led and the T5 is disconnected, short-circuit protection is formed, and adjacent pixel points cannot be influenced.
The pixel driving method according to the embodiment of the present invention is applied to the pixel circuit, and includes:
in a data writing stage, the data writing unit controls to write data voltage on the data line into the control end of the driving unit under the control of the grid line, the energy storage unit maintains the potential of the control end of the driving unit, and the light-emitting control unit disconnects the connection between the light-emitting node and the first pole of the light-emitting element and disconnects the connection between the first pole of the light-emitting element and the control end of the short-circuit protection unit under the control of the light-emitting control line;
in a light emitting stage, the light emitting control unit conducts the connection between the light emitting node and the first pole of the light emitting element and conducts the connection between the first pole of the light emitting element and the control end of the short-circuit protection unit under the control of the light emitting control line, and the short-circuit protection unit conducts or breaks the connection between the second pole of the light emitting element and the second voltage end under the control of the control end of the short-circuit protection unit.
In the pixel driving method according to the embodiment of the present invention, the connection between the first electrode of the light emitting element and the control end of the short-circuit protection unit 15 is turned on in the light emitting stage, and if the first electrode of the light emitting element is short-circuited with the second electrode of the light emitting element, the short-circuit protection unit will disconnect the second electrode of the light emitting element from the second voltage end under the control of the control end of the short-circuit protection unit, so that the second voltage input by the second voltage end is not transmitted to the second electrode of the light emitting element, thereby forming automatic short-circuit protection; when the light emitting element is normal (i.e. the first pole of the light emitting element and the second pole of the light emitting element are not short-circuited), the short-circuit protection unit is controlled by the control terminal to connect the second pole of the light emitting element and the second voltage terminal, and the driving unit drives the light emitting element to emit light.
In a specific implementation, the step of turning on or off the connection between the second pole of the light emitting element and the second voltage terminal by the short-circuit protection unit under the control of the control terminal of the short-circuit protection unit specifically includes:
when the first pole of the light-emitting element and the second pole of the light-emitting element are not short-circuited, the short-circuit protection unit conducts the connection between the second pole of the light-emitting element and the second voltage end under the control of the control end of the short-circuit protection unit;
when the first pole of the light-emitting element and the second pole of the light-emitting element are in short circuit, the short-circuit protection unit disconnects the second pole of the light-emitting element from the second voltage end under the control of the control end of the short-circuit protection unit.
The display device provided by the embodiment of the invention comprises the pixel circuit.
The display device provided by the embodiment of the invention can be any product or component with a display function, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A pixel circuit comprises a light emitting element, and is characterized by comprising a data writing unit, an energy storage unit, a driving unit, a light emitting control unit and a short-circuit protection unit,
the data writing unit is respectively connected with the grid line, the data line and the control end of the driving unit and is used for controlling the data voltage on the data line to be written into the control end of the driving unit under the control of the grid line;
the energy storage unit is connected with the control end of the driving unit and is used for maintaining the potential of the control end of the driving unit;
the first end of the driving unit is connected with the first voltage end, and the second end of the driving unit is connected with the light-emitting node; the driving unit is used for controlling connection or disconnection between the first voltage end and the light-emitting node under the control of the control end of the driving unit;
the light-emitting control unit is respectively connected with a light-emitting control line, the light-emitting node, the first pole of the light-emitting element and the control end of the short-circuit protection unit, and is used for conducting the connection between the light-emitting node and the first pole of the light-emitting element and conducting the connection between the first pole of the light-emitting element and the control end of the short-circuit protection unit under the control of the light-emitting control line in a light-emitting stage;
the first end of the short-circuit protection unit is connected with the second pole of the light-emitting element, the second end of the short-circuit protection unit is connected with the second voltage end, and the short-circuit protection unit is used for switching on or switching off the connection between the second pole of the light-emitting element and the second voltage end under the control of the control end of the short-circuit protection unit;
the light emission control unit includes a first light emission control transistor and a second light emission control transistor;
a gate of the first light emission control transistor is connected to the light emission control line, a first pole of the first light emission control transistor is connected to the light emission node, and a second pole of the first light emission control transistor is connected to the first pole of the light emitting element;
the gate of the second light-emitting control transistor is connected to the light-emitting control line, the first pole of the second light-emitting control transistor is connected to the first pole of the light-emitting element, and the second pole of the light-emitting control transistor is connected to the control end of the short-circuit protection unit.
2. The pixel circuit according to claim 1, wherein the short-circuit protection unit is specifically configured to, in a light emission phase, turn on a connection between the second pole of the light-emitting element and the second voltage terminal under control of a control terminal of the short-circuit protection unit when there is no short circuit between the first pole of the light-emitting element and the second pole of the light-emitting element, and turn off the connection between the second pole of the light-emitting element and the second voltage terminal under control of the control terminal of the short-circuit protection unit when there is a short circuit between the first pole of the light-emitting element and the second pole of the light-emitting element.
3. The pixel circuit according to claim 2, wherein the short-circuit protection unit includes a short-circuit protection transistor;
the grid of the short-circuit protection transistor is the control end of the short-circuit protection unit, the first pole of the short-circuit protection transistor is the first end of the short-circuit protection unit, and the second pole of the short-circuit protection transistor is the second end of the short-circuit protection unit.
4. The pixel circuit according to claim 3, wherein the short-circuit protection transistor is an n-type transistor.
5. The pixel circuit according to any of claims 1 to 4, wherein the data writing unit comprises a data writing transistor, the energy storage unit comprises a storage capacitor, and the driving unit comprises a driving transistor;
the gate of the driving transistor is the control end of the driving unit, the first pole of the driving transistor is the first end of the driving unit, and the second pole of the driving transistor is the second end of the driving unit;
the grid electrode of the data writing transistor is connected with the grid line, the first pole of the data writing transistor is connected with the data line, and the second pole of the data writing transistor is connected with the grid electrode of the driving transistor;
the first end of the storage capacitor is connected with the grid electrode of the driving transistor, and the second end of the storage capacitor is connected with the first voltage end.
6. The pixel circuit according to any of claims 1-4, wherein the light emitting element is a micro light emitting diode;
the anode of the micro light-emitting diode is the first pole of the light-emitting element, and the cathode of the micro light-emitting diode is the second pole of the light-emitting element.
7. A pixel driving method applied to the pixel circuit according to any one of claims 1 to 6, wherein the pixel driving method comprises:
in a data writing stage, the data writing unit controls to write data voltage on the data line into the control end of the driving unit under the control of the grid line, the energy storage unit maintains the potential of the control end of the driving unit, and the light-emitting control unit disconnects the connection between the light-emitting node and the first pole of the light-emitting element and disconnects the connection between the first pole of the light-emitting element and the control end of the short-circuit protection unit under the control of the light-emitting control line;
in a light emitting stage, the light emitting control unit conducts the connection between the light emitting node and the first pole of the light emitting element and conducts the connection between the first pole of the light emitting element and the control end of the short-circuit protection unit under the control of the light emitting control line, and the short-circuit protection unit conducts or breaks the connection between the second pole of the light emitting element and the second voltage end under the control of the control end of the short-circuit protection unit.
8. The pixel driving method according to claim 7, wherein the step of turning on or off the connection between the second electrode of the light emitting element and the second voltage terminal by the short-circuit protection unit under the control of the control terminal thereof specifically comprises:
when the first pole of the light-emitting element and the second pole of the light-emitting element are not short-circuited, the short-circuit protection unit conducts the connection between the second pole of the light-emitting element and the second voltage end under the control of the control end of the short-circuit protection unit;
when the first pole of the light-emitting element and the second pole of the light-emitting element are in short circuit, the short-circuit protection unit disconnects the second pole of the light-emitting element from the second voltage end under the control of the control end of the short-circuit protection unit.
9. A display device comprising the pixel circuit according to any one of claims 1 to 6.
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| CN110580876B (en) | 2019-09-30 | 2021-01-22 | 京东方科技集团股份有限公司 | Light emitting device control circuit, driving method thereof, array substrate and display device |
| CN110689840B (en) | 2019-11-15 | 2021-01-26 | 京东方科技集团股份有限公司 | Pixel circuit, short circuit detection method and display panel |
| CN111128076B (en) * | 2019-12-31 | 2021-06-29 | 合肥视涯技术有限公司 | Display panel, short-circuit protection method of display panel and display device |
| CN114822374B (en) * | 2022-03-03 | 2024-01-12 | 上海天马微电子有限公司 | Driving circuit, light-emitting panel, manufacturing method of light-emitting panel and display device |
| CN114664255B (en) * | 2022-04-20 | 2023-05-30 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit and display panel |
| CN114743502A (en) * | 2022-04-25 | 2022-07-12 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit and control method |
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| CN101694766A (en) * | 2005-05-02 | 2010-04-14 | 株式会社半导体能源研究所 | Light emitting device and electronic apparatus |
| EP1804229B1 (en) * | 2005-12-28 | 2016-08-17 | Semiconductor Energy Laboratory Co., Ltd. | Display device and method for inspecting the same |
| JP2008066003A (en) * | 2006-09-04 | 2008-03-21 | Sanyo Electric Co Ltd | Defect inspection method of electroluminescent display, defect correction method, and method of manufacturing electroluminescent display |
| CN102496343B (en) * | 2011-11-29 | 2014-07-16 | 深圳市华星光电技术有限公司 | Luminous diode driving circuit having short-circuit protection function |
| CN107093404A (en) * | 2016-02-17 | 2017-08-25 | 上海和辉光电有限公司 | Pixel compensation circuit and display device |
| CN106448564B (en) * | 2016-12-20 | 2019-06-25 | 京东方科技集团股份有限公司 | A kind of OLED pixel circuit and its driving method, display device |
| CN106531080B (en) * | 2016-12-29 | 2018-06-22 | 京东方科技集团股份有限公司 | A kind of pixel circuit, image element driving method, display device |
| CN106531071B (en) * | 2016-12-29 | 2018-06-05 | 京东方科技集团股份有限公司 | The driving method and display panel of pixel circuit, pixel circuit |
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