CN108154834B - Electroluminescent display panel and cross-voltage detection method of light emitting device - Google Patents

Electroluminescent display panel and cross-voltage detection method of light emitting device Download PDF

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CN108154834B
CN108154834B CN201810215038.9A CN201810215038A CN108154834B CN 108154834 B CN108154834 B CN 108154834B CN 201810215038 A CN201810215038 A CN 201810215038A CN 108154834 B CN108154834 B CN 108154834B
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control
voltage
detection line
pixel circuit
driving module
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CN108154834A (en
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袁志东
袁粲
宋丽芳
鲍文超
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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Hefei Xinsheng Optoelectronics Technology Co Ltd
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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
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • 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]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • 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]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
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  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

The invention discloses an electroluminescent display panel and a cross-voltage detection method of a light-emitting device, which comprise the following steps: the pixel circuit includes a plurality of detection lines, a plurality of light emitting devices, and pixel circuits connected in one-to-one correspondence with each of the light emitting devices. In the pixel circuit, a data writing module supplies a signal of a data signal end to a control end of a driving module under the control of a first scanning signal end; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end; the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end; the driving module is used for generating current and driving the light-emitting device to emit light. When the voltage across the light-emitting device is detected, the first control module is matched with other modules, the voltage related to the voltage across the light-emitting device is charged into the detection line, and the voltage across the light-emitting device is detected according to the voltage on the detection line.

Description

Electroluminescent display panel and cross-voltage detection method of light emitting device
Technical Field
The invention relates to the technical field of display, in particular to an electroluminescent display panel and a cross-voltage detection method of a light-emitting device.
Background
An Organic Light Emitting Diode (OLED) Display is one of the hot spots in the research field of flat panel displays, and compared with a Liquid Crystal Display (LCD), an OLED Display has the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, fast response speed, and the like. Currently, in the display field of mobile phones, digital cameras, and the like, OLED displays have begun to replace traditional LCD displays. The pixel circuit design for controlling the light emission of the OLED is the core technical content of the OLED display, and has important research significance. Due to the structural characteristics of OLEDs, a voltage cross-over exists. Generally, when the voltage difference between the anode and the cathode of the OLED is greater than the voltage across the OLED, current flows through the OLED to emit light. However, due to aging of the device, the voltage across the OLED may vary, which may cause the uniformity of the display brightness of the display to be different, and affect the display effect.
In view of the above, a problem to be solved by those skilled in the art is how to design a structure of a pixel circuit for detecting a voltage across an OLED.
Disclosure of Invention
The embodiment of the invention provides an electroluminescent display panel and a cross-voltage detection method of a light-emitting device, which are used for detecting the cross-voltage of the light-emitting device so as to realize cross-voltage compensation.
Accordingly, an embodiment of the present invention provides an electroluminescent display panel, including: the pixel circuit comprises a plurality of detection lines, a plurality of light emitting devices and pixel circuits, wherein the pixel circuits are connected with the light emitting devices in a one-to-one correspondence mode; one pixel circuit in one row is correspondingly connected with one detection line, and the same row of pixel circuits is connected with the same detection line; the pixel circuit includes: the device comprises a data writing module, a first control module, a second control module and a driving module;
the data writing module is used for providing a signal of a data signal end to the control end of the driving module under the control of a first scanning signal end;
the first control module is used for storing the voltage of the control end of the driving module under the control of a second scanning signal end;
the second control module is used for conducting the output end of the driving module and the detection line under the control of the second scanning signal end;
the input end of the driving module is connected with a first power end, and the output end of the driving module is also connected with the light-emitting device and used for generating current and driving the connected light-emitting device to emit light.
Optionally, in the above electroluminescent display panel provided in an embodiment of the present invention, the first control module includes: a first switch transistor and a first capacitor;
the grid electrode of the first switch transistor is connected with the second scanning signal end, the first pole of the first switch transistor is connected with the control end of the driving module, and the second pole of the first switch transistor is connected with the first end of the first capacitor;
and the second end of the first capacitor is connected with the first power supply end.
Optionally, in the above electroluminescent display panel provided in an embodiment of the present invention, the data writing module includes: a second switching transistor;
the grid electrode of the second switch transistor is connected with the first scanning signal end, the first pole of the second switch transistor is connected with the data signal end, and the second pole of the second switch transistor is connected with the control end of the driving module.
Optionally, in the above electroluminescent display panel provided in an embodiment of the present invention, the second control module includes: a third switching transistor; the grid electrode of the third switching transistor is connected with the second scanning signal end, the first pole of the third switching transistor is connected with the detection line, and the second pole of the third switching transistor is respectively connected with the output end of the driving module and the light-emitting device; and/or the presence of a gas in the gas,
the driving module includes: the driving transistor and the second capacitor; the grid electrode of the driving transistor is used as the control end of the driving module, the first pole of the driving transistor is used as the input end of the driving module, and the second pole of the driving transistor is used as the output end of the driving module; the second capacitor is connected between the gate and the second pole of the driving transistor.
Correspondingly, an embodiment of the present invention further provides a method for detecting a cross voltage of a light emitting device, which is applied to detect a cross voltage of a light emitting device in any one of the electroluminescent display panels provided by the embodiments of the present invention, where the method for detecting a cross voltage of a light emitting device includes:
in a detection stage of a preset detection period, controlling each pixel circuit to charge a connected detection line twice according to a detection data signal corresponding to each pixel circuit, and acquiring a voltage value on the detection line connected with each pixel circuit after each charge; the detection data signal is a signal obtained by compensating the threshold voltage of the driving transistor in the corresponding pixel circuit;
and determining the cross voltage of the light-emitting device corresponding to each pixel circuit according to the voltage value of the detection line connected with each pixel circuit obtained in the same detection stage after twice charging.
Optionally, in the detection method provided in the embodiment of the present invention, controlling the pixel circuit to charge the connected detection line each time specifically includes:
the data writing module provides the signal of the data signal end to the control end of the driving module under the control of a first scanning signal end; the first control module stores the voltage of the control end of the driving module under the control of a second scanning signal end; the second control module conducts the output end of the driving module and a detection line under the control of the second scanning signal end, and provides a reference signal on the detection line to the output end of the driving module;
the driving module generates current under the control of the voltage difference between the control end and the output end of the driving module, and drives the light-emitting device to emit light;
the second control module conducts the output end of the driving module and a detection line under the control of the second scanning signal end, and provides a reference signal on the detection line to the output end of the driving module; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end;
the driving module generates current under the control of a voltage difference between a control end and an output end of the driving module, and the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end to charge the detection line.
Optionally, in the detection method provided in the embodiment of the present invention, the voltage across the light emitting device corresponding to each of the pixel circuits is determined according to the following formula:
Figure BDA0001598356630000041
Figure BDA0001598356630000042
wherein, VL-thRepresents the voltage across the light-emitting device, CselA capacitance value, t, representing the detection line1And t2Respectively representing the charging time of the first charging and the charging time of the second charging of the detection lines connected to the same pixel circuit, Vsel-1Representing the detection line at t1Internal charging voltage value, Vsel-2Representing the detection line at t2Internal charging voltage value, Vdata1A voltage value V representing a detection data signal inputted to the pixel circuit connected to the detection linethRepresenting the threshold voltage of the drive transistor in the pixel circuit connected to the detection line, μ representing the mobility of the drive transistor, VrefVoltage, V, representing a reference signalssA voltage representing the second power supply terminal;
Figure BDA0001598356630000043
wherein, CoxRepresents the channel capacitance of the driving transistor, and W/L represents the width-to-length ratio of the driving transistor;
Figure BDA0001598356630000044
wherein, C1A capacitance value, C, representing said first capacitance2Representing the capacitance value of the second capacitor.
Correspondingly, an embodiment of the present invention further provides a method for detecting a cross voltage of a light emitting device, which is applied to detect a cross voltage of a light emitting device in any one of the electroluminescent display panels provided by the embodiments of the present invention, where the method for detecting a cross voltage of a light emitting device includes:
in a detection stage of a preset detection period, controlling each pixel circuit to charge a connected detection line according to a detection data signal corresponding to each pixel circuit, and acquiring a voltage value of the detection line after charging; the detection data signal is a signal obtained by compensating the threshold voltage and the mobility of the driving transistor in the corresponding pixel circuit;
and determining the cross voltage of the light-emitting device corresponding to each pixel circuit according to the charged voltage value of the detection line connected with each pixel circuit.
Optionally, in the detection method provided in the embodiment of the present invention, controlling the pixel circuit to charge the connected detection line specifically includes:
the data writing module provides the signal of the data signal end to the control end of the driving module under the control of a first scanning signal end; the first control module stores the voltage of the control end of the driving module under the control of a second scanning signal end; the second control module conducts the output end of the driving module and a detection line under the control of the second scanning signal end, and provides a reference signal on the detection line to the output end of the driving module;
the driving module generates current under the control of the voltage difference between the control end and the output end of the driving module, and drives the light-emitting device to emit light;
the second control module conducts the output end of the driving module and a detection line under the control of the second scanning signal end, and provides a reference signal on the detection line to the output end of the driving module; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end;
the driving module generates current under the control of a voltage difference between a control end and an output end of the driving module, and the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end to charge the detection line.
Optionally, in the detection method provided in the embodiment of the present invention, the voltage across the light emitting device corresponding to each of the pixel circuits is determined according to the following formula:
Figure BDA0001598356630000051
wherein, VL-thRepresents the voltage across the light-emitting device, CselA capacitance value, t, representing the detection line3Representing the charging time of the detection line, Vsel-3Representing the detection line at t3Internal charging voltage value, Vdata1A voltage value V representing a detection data signal inputted to the pixel circuit connected to the detection linethRepresenting the threshold voltage of the drive transistor in the pixel circuit connected to the detection line, μ representing the mobility of the drive transistor, VrefVoltage, V, representing a reference signalssA voltage representing the second power supply terminal;
Figure BDA0001598356630000052
wherein, CoxRepresents the channel capacitance of the driving transistor, and W/L represents the width-to-length ratio of the driving transistor;
Figure BDA0001598356630000061
wherein, C1A capacitance value, C, representing said first capacitance2Representing the capacitance value of the second capacitor.
The invention has the following beneficial effects:
the embodiment of the invention provides an electroluminescent display panel and a cross-voltage detection method of a light-emitting device, which comprise the following steps: the pixel circuit includes a plurality of detection lines, a plurality of light emitting devices, and pixel circuits connected in one-to-one correspondence with each of the light emitting devices. The pixel circuit may include: the device comprises a data writing module, a first control module, a second control module and a driving module; the data writing module provides a signal of the data signal end to the control end of the driving module under the control of the first scanning signal end; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end; the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end; the input end of the driving module is connected with the first power end, and the output end of the driving module is also connected with the light-emitting device and used for generating current and driving the light-emitting device to emit light. Therefore, when the voltage across the light-emitting device is detected, the voltage related to the voltage across the light-emitting device can be charged into the detection line through the action of the first control module and the mutual matching of the first control module and other modules, and the effect of detecting the voltage across the light-emitting device is achieved according to the voltage on the detection line.
Drawings
FIG. 1 is a schematic diagram of a pixel circuit in the prior art;
fig. 2 is a schematic structural diagram of an electroluminescent display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a pixel circuit in an electroluminescent display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 5 is a flowchart of a detection method according to an embodiment of the present invention;
FIG. 6a is a timing diagram of the pixel circuit shown in FIG. 4;
FIG. 6b is a second timing diagram of the pixel circuit shown in FIG. 4;
FIG. 7 is a flowchart illustrating a process of charging detection lines by pixel circuits in an electroluminescence display panel according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating a light emitting device connected to a pixel circuit in an electroluminescent display panel according to an embodiment of the present invention to emit light;
fig. 9 is a second flowchart of the detection method according to the embodiment of the present invention.
Detailed Description
At present, the threshold voltage V of the driving transistor in the pixel circuit is caused by the aging of the device and the processthAnd the mobility mu, which causes the uniformity of the display brightness of the display to vary under the same input gray scale, thereby affecting the display effect of the whole image. To improve the display effect, an internal compensation or an external compensation is generally adopted to compensate the threshold voltage V of the driving transistorthIs compensated by the mobility muAnd (6) compensating. However, the threshold voltage V to the drive transistor due to the existing internal compensationthHas a small compensation range and has a poor compensation effect on the mobility mu. While the external compensation may be for the threshold voltage V of the drive transistorthAnd the mobility mu can be well compensated.
At present, the structure of a pixel circuit using external compensation, as shown in fig. 1, generally includes: the driving transistor TFT1, the transistor TFT2, and the transistor TFT3 and the storage capacitor Cst, which are electrically connected to the detection line SL. When the display light emission is performed, the pixel circuit controls the driving transistor TFT1 to generate an operating current to drive the OLED to emit light by controlling the transistor TFT2 to be turned on to write the DATA signal terminal DATA into the gate G of the driving transistor TFT 1. In performing the external compensation, the driving transistor TFT1 is controlled to generate a current by writing a sensing data signal to the gate G of the driving transistor TFT1, writing a reference signal to the source S of the driving transistor TFT1 through the sensing line to charge the sensing line SL when the sensing line is floated, and then performing a compensation calculation based on the detected voltage to implement the compensation. However, due to aging of the device, the voltage across the OLED also varies, which also causes the uniformity of the display brightness of the display to vary, and affects the display effect.
Accordingly, embodiments of the present invention provide an electroluminescent display panel, which can implement detection of a cross voltage of a light emitting device, and can also implement a normal display function and at least compensation of a threshold voltage of a driving transistor by designing a structure of a pixel circuit.
In order to make the objects, technical solutions and advantages of the present invention clearer, specific embodiments of a cross-voltage detection method for an electroluminescent display panel and a light emitting device according to embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The electroluminescent display panel provided in the embodiment of the present invention, as shown in fig. 2 and fig. 3, may include: a plurality of detection lines SL, a plurality of light emitting devices L, and pixel circuits 10 connected to each of the light emitting devices L in one-to-one correspondence; one pixel circuit 10 in one row is correspondingly connected to one detection line SL, and the same pixel circuit 10 in the same column is connected to the same detection line SL. The pixel circuit 10 may specifically include: a data writing module 11, a first control module 12, a second control module 13 and a driving module 14; wherein the content of the first and second substances,
the DATA writing module 11 is configured to provide a signal of the DATA signal terminal DATA to the control terminal of the driving module 14 under the control of the first scan signal terminal GATE 1;
the first control module 12 is used for storing the voltage of the control terminal of the driving module 14 under the control of the second scan signal terminal GATE 2;
the second control module 13 is used for conducting the output end of the driving module 14 and the detection line SL under the control of the second scan signal terminal GATE 2;
the input end of the driving module 14 is connected to the first power supply end VDD, and the output end of the driving module 4 is further connected to the light emitting device L for generating current and driving the connected light emitting device L to emit light.
The electroluminescent display panel provided by the embodiment of the invention comprises: the pixel circuit includes a plurality of detection lines, a plurality of light emitting devices, and pixel circuits connected in one-to-one correspondence with each of the light emitting devices. The pixel circuit may include: the device comprises a data writing module, a first control module, a second control module and a driving module; the data writing module provides a signal of the data signal end to the control end of the driving module under the control of the first scanning signal end; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end; the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end; the input end of the driving module is connected with the first power end, and the output end of the driving module is also connected with the light-emitting device and used for generating current and driving the light-emitting device to emit light. Therefore, when the voltage across the light-emitting device is detected, the voltage related to the voltage across the light-emitting device can be charged into the detection line through the action of the first control module and the mutual matching of the first control module and other modules, and the effect of detecting the voltage across the light-emitting device is achieved according to the voltage on the detection line.
The present invention will be described in detail with reference to specific examples. It should be noted that the present embodiment is intended to better explain the present invention, but not to limit the present invention.
In practical applications, an electroluminescent display panel generally includes a plurality of pixel units. Each pixel cell may include a plurality of sub-pixel cells. One of the sub-pixel units may include one light emitting device and one pixel circuit. Specifically, the pixel unit may include: the pixel structure comprises a red sub-pixel unit, a green sub-pixel unit and a blue sub-pixel unit.
Alternatively, the pixel unit may include: the pixel structure comprises a red sub-pixel unit, a green sub-pixel unit, a blue sub-pixel unit and a white sub-pixel unit. Of course, in practical applications, the specific structure of the pixel unit needs to be designed and determined according to practical application environments, and is not limited herein.
In practical implementation, in the embodiment of the invention, as shown in fig. 3, the anode of the light emitting device L is connected to the driving module 14, and the cathode is connected to the second power source terminal VSS. The light emitting device may be an organic light emitting diode or a quantum dot light emitting diode. Of course, the light emitting device may be other types of electroluminescent diodes capable of emitting light by themselves, and is not limited herein.
In practical implementation, in the embodiment of the present invention, the voltage V of the first power supply terminalddMay be positive, the voltage V of the second supply terminalssMay be negative or ground. In practical application, VddAnd VssThe voltage value of (2) needs to be designed and determined according to the actual application environment, and is not limited herein.
In specific implementation, in the embodiment of the present invention, as shown in fig. 4, the driving module 14 may specifically include: the driving transistor M0 and the second capacitor C2; wherein the content of the first and second substances,
the gate G of the driving transistor M0 is used as the control terminal of the driving module 14, the first pole D of the driving transistor M0 is used as the input terminal of the driving module 14, and the second pole S of the driving transistor M0 is used as the output terminal of the driving module 14.
The second capacitor C2 is connected between the gate G of the driving transistor M0 and the second pole D of the driving transistor M0.
In the embodiment of the present invention, as shown in fig. 4, the driving transistor M0 may be an N-type transistor, the gate of the N-type transistor is the gate G of the driving transistor M0, the drain of the N-type transistor is the first pole D of the driving transistor M0, and the source of the N-type transistor is the second pole S of the driving transistor M0. The driving transistor M0 generates current under the combined action of its gate voltage and source voltage. And the current generated by the driving transistor M0 flows from the drain D of the driving transistor M0 to the source S thereof.
Of course, the driving transistor for driving the light emitting device to emit light may be a P-type transistor, the gate of the P-type transistor is the gate of the driving transistor, the source of the P-type transistor is the first pole of the driving transistor, and the drain of the P-type transistor is the second pole of the driving transistor M0. The driving transistor generates current under the combined action of the grid voltage and the drain voltage. And the current generated by the driving transistor flows from the source of the driving transistor to the drain thereof.
In an embodiment of the present invention, the second capacitor may store a voltage across it.
In specific implementation, in the embodiment of the present invention, as shown in fig. 4, the data writing module 11 may specifically include: a second switching transistor M2; wherein the content of the first and second substances,
the GATE of the second switching transistor M2 is connected to the first scan signal terminal GATE1, the first pole of the second switching transistor M2 is connected to the DATA signal terminal DATA, and the second pole of the second switching transistor M2 is connected to the control terminal of the driving module 14.
Specifically, the second pole of the second switching transistor M2 is connected to the gate G of the driving transistor M0 in the driving module 14.
In an implementation, when the second switching transistor is in a conducting state under the control of the first scan signal terminal, the signal of the data signal terminal may be provided to the gate of the driving transistor.
In specific implementation, in the embodiment of the present invention, as shown in fig. 4, the first control module 12 may specifically include: a first switch transistor M1 and a first capacitor C1; wherein the content of the first and second substances,
a GATE of the first switching transistor M1 is connected to the second scan signal terminal GATE2, a first pole of the first switching transistor M1 is connected to the control terminal of the driving module 14, and a second pole of the first switching transistor M1 is connected to the first terminal of the first capacitor C1;
a second terminal of the first capacitor C2 is connected to a first power supply terminal VDD.
Specifically, a first pole of the first switching transistor M1 is connected to the gate G of the driving transistor M0.
In the embodiment of the present invention, when the first switching transistor is in a conducting state under the control of the second scan signal terminal, the first terminal of the first capacitor and the gate of the driving transistor may be conducted. The first capacitor may store a voltage across it.
In specific implementation, in the embodiment of the present invention, as shown in fig. 4, the second control module 13 may specifically include: a third switching transistor M3; wherein the content of the first and second substances,
the GATE of the third switching transistor M3 is connected to the second scan signal terminal GATE2, the first pole of the third switching transistor M3 is connected to the corresponding detection line SL, and the second pole of the third switching transistor M3 is connected to the output terminal of the driving module 14 and the light emitting device L, respectively.
Specifically, the second pole of the third switching transistor M3 is connected to the second pole S of the driving transistor M0 and the light emitting device L, respectively.
In an embodiment of the invention, when the third switching transistor is in a conducting state under the control of the second scan signal terminal, the second pole of the driving transistor and the detection line can be conducted. Wherein the reference signal on the detection line may be provided to the second pole of the driving transistor when the second pole of the driving transistor is conductive with the detection line. Alternatively, when the second pole of the driving transistor is turned on with the detection line, the detection line is charged by a current generated by the driving transistor.
In a specific implementation, as shown in fig. 4, the switching transistor may be an N-type transistor. Alternatively, the switching transistor may be a P-type transistor, which is not limited herein.
In the embodiment of the present invention, the driving transistors and the switching transistors may be Thin Film Transistors (TFTs) or Metal Oxide semiconductor field effect transistors (MOS), but are not limited thereto. In specific implementation, according to different types of the switching transistor and signals of the signal terminal, the first pole of the switching transistor may be used as the source thereof, and the second pole of the switching transistor may be used as the drain thereof; or, conversely, the first pole is used as the drain thereof, and the second pole is used as the source thereof, which is not limited herein.
The above is merely to illustrate the specific structure of each module in the pixel circuit in the electroluminescent display panel provided in the embodiment of the present invention, and in the implementation, the specific structure of each module in the pixel circuit is not limited to the structure provided in the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
The embodiment of the invention also provides a cross-voltage detection method of the light-emitting device, which can be applied to the cross-voltage detection of the light-emitting device in the electroluminescent display panel provided by the embodiment of the invention.
As shown in fig. 5, the detection method provided in the embodiment of the present invention may include the following steps:
s501, in a detection stage of a preset detection period, controlling each pixel circuit to charge a connected detection line twice according to a detection data signal corresponding to each pixel circuit, and acquiring a voltage value on the detection line connected with each pixel circuit after each charge; the detection data signal is a signal obtained by compensating the threshold voltage of the driving transistor in the corresponding pixel circuit;
and S502, determining the cross voltage of the light-emitting device corresponding to each pixel circuit according to the voltage value obtained in the same detection stage after the detection line connected with each pixel circuit is charged twice.
In the detection method provided by the embodiment of the invention, each pixel circuit in the electroluminescent display panel is controlled to charge the detection line connected with the pixel circuit twice in the detection stage of the preset detection period, and the voltage value of the detection line connected with each pixel circuit is obtained after each charge. And then, according to the voltage values of the detection lines connected with the same pixel circuit obtained in the same detection stage after two times of charging, the cross voltage of the light-emitting device in the pixel circuit can be determined, so that the effect of detecting the cross voltage of the light-emitting device is realized.
In specific implementation, in the embodiment of the present invention, the two times of charging are different for the detection lines electrically connected to the same pixel circuit, so that the voltage values after charging are also different.
In practical implementation, in the embodiment of the present invention, the preset detection period may be a preselected time, such as one day, 30 days, 2 months, or half a year. Of course, in practical applications, the specific implementation manner of the preset detection period needs to be designed and determined according to the practical application environment, and is not limited herein.
During scanning of the display panel, scanning always starts from the upper left corner of the image, proceeding horizontally forward, while the scanning spot also moves downward at a slower rate. When a complete frame of image is scanned, after the scanning point scans a frame, it is to return from the lower right corner of the image to the upper left corner of the image, and start scanning a new frame, this time interval is called a blanking area. In the blank area, the data voltage for displaying the image is not transmitted. For signal detection, since no image is displayed in the blanking region, the time of the blanking region can be used for signal detection and determination. In particular implementations, in embodiments of the invention, the detection phase may be a blanking region in the display frame. This allows real-time detection. Alternatively, the detection phase may be a blanking region of the display frame that is spaced several display frames apart. The detection stage may be in the time when the electroluminescent display panel is turned on, in the time when the electroluminescent display panel is normally displayed, or in the time when the electroluminescent display panel is turned off. Of course, in practical applications, the specific implementation manner of the detection stage needs to be designed and determined according to the practical application environment, and is not limited herein.
In an embodiment of the present invention, controlling each pixel circuit to charge the connected detection line twice may specifically include:
in the blanking region of the 2m-1 th display frame, the voltage value of the detection data signal is Vdata1) Controlling each pixel circuit in the mth row to be charged for a time t1Charging the connected detection lines for the first time, and acquiring the voltage value V on the detection line connected with each pixel circuit in the mth row after chargingsel-1(ii) a Wherein M is an integer greater than or equal to 1 and less than or equal to M, and M is the total number of rows of sub-pixels in the electroluminescent display panel.
In the blanking region of the 2 m-th display frame, the pixel circuits in the m-th row are driven by the detection data signal (the voltage value of the detection data signal is V)data1) Controlling each pixel circuit in the mth row to be charged for a time t2Charging the connected detection lines for the second time, and obtaining the voltage value V on the detection line connected with each pixel circuit in the m-th row after chargingsel-2(ii) a Wherein t is1≠t2Thus Vsel-1≠Vsel-2。
Specifically, in the blanking region of the 1 st display frame, the detection data signal corresponding to the 1 st row pixel circuit (the voltage value of the detection data signal is V)data1) Controlling each pixel circuit in the 1 st row to be charged for a time t1And charging the connected detection lines for the first time, and acquiring the voltage value on the detection line connected with each pixel circuit in the 1 st row after charging. In the blanking region of the 2 nd display frame, the voltage value of the detection data signal is V according to the detection data signal corresponding to the 1 st row pixel circuitdata1) Controlling each pixel circuit in the 1 st row to be charged for a time t2And charging the connected detection lines for the second time, and acquiring the voltage value on the detection line connected with each pixel circuit in the 1 st row after charging. In the blanking region of the 3 rd display frame, the detection data signal (the detection number) corresponding to the 2 nd row pixel circuit is usedAccording to the voltage value of the signal being Vdata1) And controlling each pixel circuit in the 2 nd row to be charged for time t1And charging the connected detection lines for the first time, and acquiring the voltage value on the detection line connected with each pixel circuit in the 2 nd row after charging. In the blanking region of the 4 th display frame, the detection data signal corresponding to the 2 nd row pixel circuit (the voltage value of the detection data signal is V)data1) And controlling each pixel circuit in the 2 nd row to be charged for time t2And charging the connected detection lines for the second time, and acquiring the voltage value of the detection line connected with each pixel circuit in the 2 nd row after charging. The working process of charging twice from row 3 to row M is analogized, and the details are not described herein.
Of course, in the embodiment of the present invention, the controlling of the pixel circuits in each row to charge the detection line connected to the pixel circuits twice in sequence may specifically include:
in the blanking region of the nth display frame, the voltage value of the detection data signal is Vdata1) Controlling each pixel circuit in the nth row to be charged for a time t1Charging the connected detection lines for the first time, and obtaining the voltage value V on the detection line connected with each pixel circuit in the nth row after chargingsel-1(ii) a N is an integer greater than or equal to 1 and less than or equal to N, which is the total number of rows of sub-pixels in the electroluminescent display panel.
In the blanking region of the (N + N) th display frame, the detection data signal corresponding to the pixel circuit of the N-th row (the voltage value of the detection data signal is V)data1) Controlling each pixel circuit in the nth row to be charged for a time t2Charging the connected detection lines for the second time, and obtaining the voltage value V on the detection line connected with each pixel circuit in the nth row after chargingsel-2(ii) a Wherein t is1≠t2Thus Vsel-1≠Vsel-2。
Specifically, in the blanking area of the 1 st display frame, each pixel circuit in the 1 st row is controlled to be charged for the time t according to the detection data signal corresponding to the pixel circuit in the 1 st row1And charging the connected detection lines for the first time, and acquiring the voltage value on the detection line connected with each pixel circuit in the 1 st row after charging. In the blanking region of the 2 nd display frame, each pixel circuit in the 2 nd row is controlled to be charged for a time t according to the detection data signal corresponding to the pixel circuit in the 2 nd row1And charging the connected detection lines for the first time, and acquiring the voltage value on the detection line connected with each pixel circuit in the 2 nd row after charging. In the blanking areas of the 3 rd to nth display frames, the detection lines connected to the pixel circuits in the 3 rd to nth rows are sequentially charged for the first time, and so on, which is not described herein again. In the blanking region of the (N + 1) th display frame, each pixel circuit in the 1 st row is controlled to be charged for t2And charging the connected detection lines for the second time, and acquiring the voltage value on the detection line connected with each pixel circuit in the 1 st row after charging. In the blanking region of the (N + 2) th display frame, each pixel circuit in the 2 nd row is controlled to be charged for a time t according to the detection data signal corresponding to the pixel circuit in the 2 nd row2And charging the connected detection lines for the second time, and acquiring the voltage value of the detection line connected with each pixel circuit in the 2 nd row after charging. In the blanking areas of the 3 rd to 2 nd display frames, the detection lines connected to the pixel circuits in the 3 rd to nth rows are sequentially charged for the second time, and so on, which is not described herein again.
In practical implementation, in the embodiment of the present invention, the voltage V across the light emitting device corresponding to each pixel circuit can be determined according to the following formulaL-th：
Figure BDA0001598356630000151
Figure BDA0001598356630000152
Wherein, VL-thRepresenting the voltage across the light-emitting device, CselRepresentative detection lineCapacitance value of (t)1And t2Respectively representing the charging time of the first charging and the charging time of the second charging of the detection lines connected to the same pixel circuit, Vsel-1Representative detection line at t1Internal charging voltage value, Vsel-2Representative detection line at t2Internal charging voltage value, Vdata1Representing the voltage value, V, of the detection data signal in the pixel circuit connected to the input detection linethRepresenting the threshold voltage of the drive transistor in the pixel circuit connected to the detection line, μ representing the mobility of the drive transistor, VrefRepresenting the voltage value, V, of the reference signalssA voltage value representing the second power supply terminal;
Figure BDA0001598356630000153
wherein, CoxRepresents the channel capacitance of the driving transistor, and W/L represents the width-to-length ratio of the driving transistor;
Figure BDA0001598356630000154
wherein, C1Representing the capacitance value of the first capacitor, C2Representing the capacitance value of the second capacitor.
In practical application, Csel、Cox、W/L、C1And C2Are parameter values that are predetermined at the time of process design, i.e., are known values. Vdata1For changing V by means of external compensation in the prior artthVoltage after compensation in the pair VthIn the course of compensation, V can be determinedthThus Vdata1And VthAre also known values. t is t1And t2Is a value preset at the time of detection, and Vsel-1And Vsel-2In order to be able to detect the resulting voltage value in a manner known in the art, t is therefore1、t2、Vsel-1And Vsel-2Also of known value. Therefore, the unknown value in the above two formulas is VL-thMu, so that the cross-pressure V can be obtained according to the two formulas and through mathematical calculationL-th. For example, one of the equations is transformed to obtain a table of μExpression, and substituting the obtained expression of mu into another formula to obtain the voltage VL-th。
In a specific implementation, as shown in fig. 7, in the embodiment of the present invention, each time the pixel circuit is controlled to charge the connected detection line, the method may specifically include the following steps:
s701, the data writing module provides a signal of the data signal end to a control end of the driving module under the control of the first scanning signal end; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end; the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end, and provides the reference signal on the detection line to the output end of the driving module;
s702, the driving module generates current under the control of the voltage difference between the control end and the output end of the driving module, and drives the light-emitting device to emit light;
s703, the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end, and provides the reference signal on the detection line to the output end of the driving module; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end;
s704, the detection lines are controlled to be in floating connection, the driving module generates current under the control of the voltage difference between the control end and the output end of the driving module, and the second control module conducts the output end of the driving module and the detection lines under the control of the second scanning signal end to charge the detection lines.
In practical implementation, in the embodiment of the present invention, as shown in fig. 8, the controlling the pixel circuit to emit light to the connected light emitting device may specifically include the following steps:
s801, the data writing module provides a signal of a data signal end to a control end of the driving module under the control of a first scanning signal end; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end; the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end, and provides the reference signal on the detection line to the output end of the driving module;
s802, the driving module generates current under the control of the voltage difference between the control end and the output end of the driving module, and the light emitting device is driven to emit light.
In a specific implementation, the pixel circuit can be controlled to charge the connected detection line and drive the light emitting device to emit light by controlling the first scan signal terminal, the second scan signal terminal, the data signal terminal, and the detection line in the pixel circuit.
The following describes the detection method provided in the embodiment of the present invention by a specific embodiment, but the reader should understand that the specific detection process is not limited thereto.
The first embodiment,
The following describes the operation of the above detection provided by the embodiment of the present invention with reference to the timing diagrams of the circuits shown in fig. 6a and 6b by taking the structure of the pixel circuit shown in fig. 4 as an example. In the following description, 1 represents a high level, and 0 represents a low level. It should be noted that 1 and 0 are logic levels, which are only used to better explain the specific operation of the embodiment of the present invention, and not the voltage applied to the gate of each switching transistor in the specific implementation. A
6a only signals of one row of pixel circuits in the electroluminescent display panel in the detection phase of the blanking region of one display frame. Fig. 6b shows only signals for driving the connected light emitting devices L to emit light by one row of pixel circuits in the electroluminescent display panel.
Specifically, in fig. 6a and 6b, the GATE1 represents the signal inputted from the first scan signal terminal GATE1, the GATE2 represents the signal inputted from the second scan signal terminal GATE2, the DATA represents the signal inputted from the DATA signal terminal DATA, the stage T1 represents the detection stage, wherein the stage T1 is divided into the stages T11, T12, T13 and T14. The T2 stage represents the display stage, in which the T2 stage is divided into the T21 and T22 stages. The detection line SL floats in the stage T14, i.e., does not transmit the reference signal, but is used to charge it by the current generated by the driving transistor M0. In the remaining phases, the detection line SL transmits the reference signal Vref at least in the phases T11, T13, and T21.
At stage T11, fromWhen the gate1 is equal to 1, the second switching transistor M2 is turned on to provide the DATA signal at the DATA signal terminal DATA to the gate G of the driving transistor M0, so that the gate voltage thereof is equal to the voltage V of the DATA signaldata1. Since the gate2 is equal to 1, the first switching transistor M1 and the third switching transistor M3 are turned on. The turned-on first switch transistor M1 can turn on the gates of the first capacitor C1 and the driving transistor M0, and the first capacitor C1 and the second capacitor C2 store the voltage Vdata1. The turned-on third switching transistor M3 can turn on the source S of the driving transistor M0 and the detection line SL, and provide the reference signal on the detection line SL to the source S of the driving transistor M0, so that the voltage of the source S is the voltage V of the reference signalref. The driving transistor M0 generates a current I under the common control of its gate voltage and its source voltage1，I1＝Kμ[VGS-Vth]2＝K[Vdata1-Vref-Vth]2(ii) a Wherein, VGSRepresents the gate-source voltage of the driving transistor M0, μ is the mobility of the driving transistor M0;
Figure BDA0001598356630000181
wherein, CoxIs the channel capacitance of the drive transistor M0, and W/L is the width to length ratio of the drive transistor M0. Due to Vref-Vss<VL-thWherein V isL-thRepresenting the voltage across the light emitting device L. Therefore, the light emitting device L does not emit light.
At stage T12, since the gate1 is 0, the second switching transistor M2 is turned off. Since the gate2 is equal to 0, the first switching transistor M1 and the third switching transistor M3 are turned off. Accordingly, the first power source terminal VDD charges the source S through the driving transistor M0 and drives the light emitting device L to emit light. Since the light emitting device L emits light, and due to the voltage dividing action of the light emitting device L, the voltage of the source S of the driving transistor M0 becomes: vss+VL-th. Due to the coupling effect of the second capacitor C2, in order to keep the voltage difference across the second capacitor C2 stable: vdata1-VrefTherefore, at this time, the gate voltage of the driving transistor M0 jumps to: vdata1+Vss+VL-th-Vref。
In the stage T13, since the gate1 is 0, the second switching transistor M2 is turned off. Since the gate2 is equal to 1, the first switching transistor M1 and the third switching transistor M3 are turned on. The turned-on first switch transistor M1 may turn on the first capacitor C1 and the gate of the driving transistor M0. The turned-on third switching transistor M3 can turn on the source S of the driving transistor M0 and the detection line SL, and provide the reference signal on the detection line SL to the source S of the driving transistor M0 to make the voltage of the source S be the voltage Vref. The source voltage of the driving transistor M0 is Vss+VL-thJump to VrefAnd due to the coupling and voltage division effects of the first capacitor C1 and the second capacitor C2, the variation of the gate voltage of the driving transistor M0 is:
Figure BDA0001598356630000182
wherein, C1Representing the capacitance value of the first capacitor, C2Representing the capacitance value of the second capacitor. The gate voltage becomes:
Figure BDA0001598356630000183
the driving transistor M0 generates a current I under the common control of its gate voltage and its source voltage2，
Figure BDA0001598356630000191
Due to Vref-Vss<VL-thTherefore, the light emitting device L does not emit light.
At stage T14, since the gate1 is 0, the second switching transistor M2 is turned off. Since the gate2 is equal to 1, the first switching transistor M1 and the third switching transistor M3 are turned on. The turned-on first switch transistor M1 may turn on the first capacitor C1 and the gate of the driving transistor M0. The turned-on third switching transistor M3 may turn on the source S of the driving transistor M0 and the detection line SL, thereby charging for the first time t1In addition, the current I generated by the driving transistor M02Charging the detection line SL so that the detection line SL can be charged with the voltage Vse1-1. Pass voltage detection deviceFor example, an Analog-to-Digital Converter (ADC) may obtain the voltage V after the detection line SL is chargedsel-1. Thereby according to I2And a capacitive charging formula: t ═ C ═ V; wherein, I represents a current value charged into the capacitor (which can be used as one electrode of the capacitor when the detection line SL is floating), t represents a charging time, C represents a capacitance value of the capacitor, and V represents a voltage value charged into the capacitor within the time t; can obtain VL-thAnd Vsel-1The relation of (1):
Figure BDA0001598356630000192
wherein the content of the first and second substances,
Figure BDA0001598356630000193
accordingly, the voltage V charged into the detection line SLse1And VL-thAnd μ.
However, the detection data signal in the T11 stage is a data signal that has compensated the threshold voltage in the current formula by means of external compensation. The external compensation method may be represented by the formula:
Figure BDA0001598356630000194
compensated, wherein VdataRepresents the voltage of the compensated data signal, L0Which represents the brightness of the light source,
Figure BDA0001598356630000195
represents a constant, V, related to mobilitysel-0Representing the voltage, V, charged to the sensing line during external compensationthRepresenting the threshold voltage, V, of the drive transistor M0refRepresenting the voltage of the reference signal transmitted on the detection line. Due to the need for VthCompensation is performed so that V is obtained during compensationthOf such that VthThe value of (c) may be a known amount. The external compensation method for compensating the threshold voltage of the driving transistor is the same as the compensation method in the prior art, and is not described herein again. Of course, the external compensation method may also adopt other compensation methods in the prior art, which are not described herein.
However, due to the voltage VL-thAlso related to μ, therefore, it is necessary to control the same pixel circuit to charge the detection line SL for the second time so that the pixel circuit is charged for the second time t2Charging voltage V to internal enable detection line SLsel-2. Thus, the formula is obtained:
Figure BDA0001598356630000201
in practical application, V is generally setrefAnd VssIs set to 0V, and therefore,
Figure BDA0001598356630000202
and
Figure BDA0001598356630000203
thus, mu is eliminated by the two formulas to obtain the voltage V across the light-emitting device LL-th. When the pixel circuit is controlled to charge the detection line SL for the second time, the working process of the pixel circuit is the same as that of the pixel circuit during the first charging, and details are not described herein.
Across voltage V of the light emitting device L is obtainedL-thThen, the obtained cross voltage V can be usedL-thCompensation is performed. The voltage across V of the unaged light-emitting device can be detected first, for example, by the method described aboveL-th1To connect V withL-th1As a reference, the voltage across V of the light emitting device after being used for a period of time is detected by the methodL-th2Comparison VL-th1And VL-th2If within the error range, VL-th1And VL-th2Otherwise, the voltage of the data signal is adjusted to realize compensation. Of course, the compensation method according to the cross voltage may also be the same as that in the prior art, and will not be described herein.
In the subsequent display stage, a data signal having a voltage V which compensates for the threshold voltage of the driving transistor M0 and the cross voltage of the light emitting device L is input to the pixel circuitdata2。
Specifically, in the stage T21, since gate1 is 1, the second switching crystal is turned on or offThe transistor M2 is turned on to supply the compensated DATA signal at the DATA signal terminal DATA to the gate G of the driving transistor M0 to make the gate voltage thereof equal to the voltage V of the compensated DATA signaldata2. Since the gate2 is equal to 1, the first switching transistor M1 and the third switching transistor M3 are turned on. The turned-on first switch transistor M1 can turn on the gates of the first capacitor C1 and the driving transistor M0, and the first capacitor C1 and the second capacitor C2 store the voltage Vdata2. The turned-on third switching transistor M3 can turn on the source S of the driving transistor M0 and the detection line SL, and provide the reference signal on the detection line SL to the source S of the driving transistor M0 to make the voltage of the source S be the voltage Vref. The driving transistor M0 generates a current I under the common control of its gate voltage and its source voltage3，I3＝Kμ[VGS-Vth]2＝Kμ[Vdata2-Vref-Vth]2. Due to Vref-Vss<VL-thTherefore, the light emitting device L does not emit light.
At stage T22, since the gate1 is 0, the second switching transistor M2 is turned off. Since the gate2 is equal to 0, the first switching transistor M1 and the third switching transistor M3 are turned off. Accordingly, the first power terminal VDD charges the source S through the driving transistor M0, and the driving transistor M0 generates a current I3The light emitting device L is driven to emit light.
In practical application, the threshold voltage V in the current formula can be compensated by external compensationthAnd mobility μ. Due to the need for VthCompensate with mu, so that V can be obtained in the process of compensationthWith a value of μ such that VthThe value of and μmay be a known amount. Therefore, the pixel circuit can be controlled to charge the connected detection line once, so that the charging times and the calculation amount can be reduced, and the voltage is reduced.
The embodiment of the invention also provides a method for detecting the cross voltage of the light-emitting device, which can be applied to detecting the cross voltage of the light-emitting device in any one of the electroluminescent display panels provided by the embodiment of the invention.
As shown in fig. 9, the detection method provided in the embodiment of the present invention may include the following steps:
s901, in a detection stage of a preset detection period, controlling each pixel circuit to charge a connected detection line according to a detection data signal corresponding to each pixel circuit, and acquiring a voltage value of the detection line after charging; the detection data signal is a signal obtained by compensating the threshold voltage and the mobility of the driving transistor in the corresponding pixel circuit;
and S902, determining the cross voltage of the light-emitting device corresponding to each pixel circuit according to the charged voltage value of the detection line connected with each pixel circuit.
In the detection method provided by the embodiment of the invention, each pixel circuit in the electroluminescent display panel is controlled to charge the detection line connected with the pixel circuit in the detection stage of the preset detection period, and the voltage value of the detection line connected with each pixel circuit is obtained after the charging. And then the cross voltage of the light-emitting device in each pixel circuit can be determined according to the charged voltage value of the detection line connected with each pixel circuit, so that the effect of detecting the cross voltage of the light-emitting device is realized.
In specific implementation, in the embodiment of the present invention, the time for charging the detection lines electrically connected to different pixel circuits may be the same or different, which needs to be determined according to the actual application environment, and is not limited herein.
In practical implementation, in the embodiment of the present invention, the preset detection period may be a preselected time, such as one day, 30 days, 2 months, or half a year. Of course, in practical applications, the specific implementation manner of the preset detection period needs to be designed and determined according to the practical application environment, and is not limited herein.
During scanning of the display panel, scanning always starts from the upper left corner of the image, proceeding horizontally forward, while the scanning spot also moves downward at a slower rate. When a complete frame of image is scanned, after the scanning point scans a frame, it is to return from the lower right corner of the image to the upper left corner of the image, and start scanning a new frame, this time interval is called a blanking area. In the blank area, the data voltage for displaying the image is not transmitted. For signal detection, since no image is displayed in the blanking region, the time of the blanking region can be used for signal detection and determination. In particular implementations, in embodiments of the invention, the detection phase may be a blanking region in the display frame. This allows real-time detection. Alternatively, the detection phase may be a blanking region of the display frame that is spaced several display frames apart. The detection stage may be in the time when the electroluminescent display panel is turned on, in the time when the electroluminescent display panel is normally displayed, or in the time when the electroluminescent display panel is turned off. Of course, in practical applications, the specific implementation manner of the detection stage needs to be designed and determined according to the practical application environment, and is not limited herein.
In an implementation, the electroluminescent display panel generally includes a plurality of rows of sub-pixels, and controlling each pixel circuit to charge the connected detection line may specifically include:
in the blanking region of the z-th display frame, the voltage value of the detection data signal is Vdata1) Controlling each pixel circuit in the z-th row to charge the connected detection line, and acquiring the voltage value V on the detection line connected with each pixel circuit in the z-th row after chargingsel-3(ii) a Z is an integer greater than or equal to 1 and less than or equal to Z, which is the total number of rows of sub-pixels in the electroluminescent display panel.
In practical implementation, in the embodiment of the present invention, the voltage across the light emitting device corresponding to each pixel circuit may be determined according to the following formula:
Figure BDA0001598356630000221
wherein, VL-thRepresenting the voltage across the light-emitting device, CselCapacitance values, t, representing the detection line3Representing the charging time of the detection line, Vsel-3Representative detection line at t0Internal charging voltage value, Vdata1Voltage representing detection data signal in pixel circuit connected with input detection lineValue VthRepresenting the threshold voltage of the drive transistor in the pixel circuit connected to the detection line, μ representing the mobility of the drive transistor, VrefVoltage, V, representing a reference signalssA voltage representing the second power supply terminal;
Figure BDA0001598356630000231
wherein, CoxRepresents the channel capacitance of the driving transistor, and W/L represents the width-to-length ratio of the driving transistor;
Figure BDA0001598356630000232
wherein, C1Representing the capacitance value of the first capacitor, C2Representing the capacitance value of the second capacitor. In practical application, Csel、Cox、W/L、C1And C2Are parameter values that are predetermined at the time of process design, i.e., are known values. Vdata1For changing V by means of external compensation in the prior artthVoltage compensated with mu in the pair VthIn the process of compensating with mu, V can be determinedthAnd μ, thus Vdata1、VthAnd μ are also known values. t is t3Is a value preset at the time of detection, and Vsel-3In order to be able to detect the resulting voltage value in a manner known in the art, t is therefore3And Vsel-3And may be a known value. Therefore, the cross-over voltage V can be obtained by the formulaL-th。
In a specific implementation, as shown in fig. 7, in the embodiment of the present invention, each time the pixel circuit is controlled to charge the connected detection line, the method may specifically include the following steps:
s701, the data writing module provides a signal of the data signal end to a control end of the driving module under the control of the first scanning signal end; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end; the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end, and provides the reference signal on the detection line to the output end of the driving module;
s702, the driving module generates current under the control of the voltage difference between the control end and the output end of the driving module, and drives the light-emitting device to emit light;
s703, the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end, and provides the reference signal on the detection line to the output end of the driving module; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end;
s704, the detection lines are controlled to be in floating connection, the driving module generates current under the control of the voltage difference between the control end and the output end of the driving module, and the second control module conducts the output end of the driving module and the detection lines under the control of the second scanning signal end to charge the detection lines.
In practical implementation, in the embodiment of the present invention, as shown in fig. 8, the controlling the pixel circuit to emit light to the connected light emitting device may specifically include the following steps:
s801, the data writing module provides a signal of a data signal end to a control end of the driving module under the control of a first scanning signal end; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end; the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end, and provides the reference signal on the detection line to the output end of the driving module;
s802, the driving module generates current under the control of the voltage difference between the control end and the output end of the driving module, and the light emitting device is driven to emit light.
In a specific implementation, the pixel circuit can be controlled to charge the detection line connected thereto and drive the light emitting device to emit light by controlling the first scan signal terminal, the second scan signal terminal, the data signal terminal, and the detection line in the pixel circuit.
The following describes the detection method provided in the embodiment of the present invention by a specific embodiment, but the reader should understand that the specific detection process is not limited thereto.
Example II,
In specific implementation, the pixel circuit can be controlled to charge the connected detection line by controlling the first scan signal terminal, the second scan signal terminal, the data signal terminal, and the detection line in the pixel circuit. When the structure of the pixel circuit in the electroluminescent display panel according to the embodiment of the present invention is shown in fig. 4, the input signals are shown in fig. 6a and fig. 6 b.
Specifically, fig. 6a shows only signals of one row of pixel circuits in the electroluminescent display panel in the blanking region detection phase of one display frame. Fig. 6b shows only signals for driving the connected light emitting devices L to emit light by one row of pixel circuits in the electroluminescent display panel.
The operation process of controlling the pixel circuit shown in fig. 4 to charge the connected detection line SL through the signal in fig. 6a may be the same as the operation process at stage T1 in the first embodiment, and is not repeated here.
The operation process of controlling the pixel circuit shown in fig. 4 to drive the light emitting device L to emit light through the signal in fig. 6b may be the same as the operation process at stage T2 in the first embodiment, and is not repeated here.
The embodiment of the invention provides an electroluminescent display panel and a cross-voltage detection method of a light-emitting device, which comprise the following steps: the pixel circuit includes a plurality of detection lines, a plurality of light emitting devices, and pixel circuits connected in one-to-one correspondence with each of the light emitting devices. The pixel circuit may include: the device comprises a data writing module, a first control module, a second control module and a driving module; the data writing module provides a signal of the data signal end to the control end of the driving module under the control of the first scanning signal end; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end; the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end; the input end of the driving module is connected with the first power end, and the output end of the driving module is also connected with the light-emitting device and used for generating current and driving the light-emitting device to emit light. Therefore, when the voltage across the light-emitting device is detected, the voltage related to the voltage across the light-emitting device can be charged into the detection line through the action of the first control module and the mutual matching of the first control module and other modules, and the effect of detecting the voltage across the light-emitting device is achieved according to the voltage on the detection line.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention 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 of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (5)

1. An electroluminescent display panel comprising: the pixel circuit comprises a plurality of detection lines, a plurality of light emitting devices and pixel circuits, wherein the pixel circuits are connected with the light emitting devices in a one-to-one correspondence mode; one pixel circuit in one row is correspondingly connected with one detection line, and the same row of pixel circuits is connected with the same detection line; wherein the pixel circuit comprises: the device comprises a data writing module, a first control module, a second control module and a driving module;
the data writing module is used for providing a signal of a data signal end to the control end of the driving module under the control of a first scanning signal end;
the first control module is used for storing the voltage of the control end of the driving module under the control of a second scanning signal end; the first control module includes: a first switch transistor and a first capacitor; the grid electrode of the first switch transistor is connected with the second scanning signal end, the first pole of the first switch transistor is connected with the control end of the driving module, and the second pole of the first switch transistor is connected with the first end of the first capacitor; the second end of the first capacitor is connected with the first power supply end;
the second control module is used for conducting the output end of the driving module and the detection line under the control of the second scanning signal end;
the input end of the driving module is connected with a first power supply end, and the output end of the driving module is also connected with the light-emitting device and used for generating current and driving the connected light-emitting device to emit light; the driving module includes: the driving transistor and the second capacitor; the grid electrode of the driving transistor is used as the control end of the driving module, the first pole of the driving transistor is used as the input end of the driving module, and the second pole of the driving transistor is used as the output end of the driving module; the second capacitor is connected between the grid electrode and the second electrode of the driving transistor;
the voltage-spanning detection method of the light-emitting device comprises the following steps:
in a detection stage of a preset detection period, controlling each pixel circuit to charge a connected detection line twice according to a detection data signal corresponding to each pixel circuit, and acquiring a voltage value on the detection line connected with each pixel circuit after each charge; the detection data signal is a signal obtained by compensating the threshold voltage of the driving transistor in the corresponding pixel circuit;
determining the cross voltage of the light-emitting device corresponding to each pixel circuit according to the voltage value obtained in the same detection stage after the detection line connected with each pixel circuit is charged twice;
controlling the pixel circuit to charge the connected detection line each time specifically comprises:
the data writing module provides the signal of the data signal end to the control end of the driving module under the control of a first scanning signal end; the first control module stores the voltage of the control end of the driving module under the control of a second scanning signal end; the second control module conducts the output end of the driving module and a detection line under the control of the second scanning signal end, and provides a reference signal on the detection line to the output end of the driving module;
the driving module generates current under the control of the voltage difference between the control end and the output end of the driving module, and drives the light-emitting device to emit light;
the second control module conducts the output end of the driving module and a detection line under the control of the second scanning signal end, and provides a reference signal on the detection line to the output end of the driving module; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end;
the driving module generates current under the control of a voltage difference between a control end and an output end of the driving module, and the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end to charge the detection line;
determining the cross voltage of the light emitting device corresponding to each pixel circuit according to the following formula:
Figure FDA0002969274690000021
Figure FDA0002969274690000022
wherein, VL-thRepresents the voltage across the light-emitting device, CselA capacitance value, t, representing the detection line1And t2Respectively representing the charging time of the first charging and the charging time of the second charging of the detection lines connected to the same pixel circuit, Vsel-1Representing the detection line at t1Internal charging voltage value, Vsel-2Representing the detection line at t2Internal charging voltage value, Vdata1A voltage value V representing a detection data signal inputted to the pixel circuit connected to the detection linethRepresenting the threshold voltage of the drive transistor in the pixel circuit connected to the detection line, μ representing the mobility of the drive transistor, VrefA voltage value, V, representing a reference signal on the detection linessA voltage value representing the second power supply terminal;
Figure FDA0002969274690000031
wherein, CoxRepresents the channel capacitance of the driving transistor, and W/L represents the width-to-length ratio of the driving transistor;
Figure FDA0002969274690000032
wherein, C1A capacitor representing the first capacitanceValue, C2A capacitance value representing a second capacitance; alternatively, the first and second electrodes may be,
the voltage-spanning detection method of the light-emitting device comprises the following steps:
in a detection stage of a preset detection period, controlling each pixel circuit to charge a connected detection line according to a detection data signal corresponding to each pixel circuit, and acquiring a voltage value of the detection line after charging; the detection data signal is a signal obtained by compensating the threshold voltage and the mobility of the driving transistor in the corresponding pixel circuit;
determining the cross voltage of the light-emitting device corresponding to each pixel circuit according to the charged voltage value of the detection line connected with each pixel circuit;
controlling the pixel circuit to charge the connected detection line, specifically comprising:
the data writing module provides the signal of the data signal end to the control end of the driving module under the control of a first scanning signal end; the first control module stores the voltage of the control end of the driving module under the control of a second scanning signal end; the second control module conducts the output end of the driving module and a detection line under the control of the second scanning signal end, and provides a reference signal on the detection line to the output end of the driving module;
the driving module generates current under the control of the voltage difference between the control end and the output end of the driving module, and drives the light-emitting device to emit light;
the second control module conducts the output end of the driving module and a detection line under the control of the second scanning signal end, and provides a reference signal on the detection line to the output end of the driving module; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end;
the driving module generates current under the control of a voltage difference between a control end and an output end of the driving module, and the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end to charge the detection line;
determining the cross voltage of the light emitting device corresponding to each pixel circuit according to the following formula:
Figure FDA0002969274690000041
wherein, VL-thRepresents the voltage across the light-emitting device, CselA capacitance value, t, representing the detection line3Representing the charging time of the detection line, Vsel-3Representing the detection line at t3Internal charging voltage value, Vdata1A voltage value V representing a detection data signal inputted to the pixel circuit connected to the detection linethRepresenting the threshold voltage of the drive transistor in the pixel circuit connected to the detection line, μ representing the mobility of the drive transistor, VrefVoltage, V, representing a reference signal on the detection linessA voltage representing the second power supply terminal;
Figure FDA0002969274690000042
wherein, CoxRepresents the channel capacitance of the driving transistor, and W/L represents the width-to-length ratio of the driving transistor;
Figure FDA0002969274690000043
wherein, C1Representing the capacitance value of the first capacitor, C2Representing the capacitance value of the second capacitor.
2. The electroluminescent display panel of claim 1, wherein the data writing module comprises: a second switching transistor;
the grid electrode of the second switch transistor is connected with the first scanning signal end, the first pole of the second switch transistor is connected with the data signal end, and the second pole of the second switch transistor is connected with the control end of the driving module.
3. The electroluminescent display panel of claim 1, wherein the second control module comprises: a third switching transistor; the grid electrode of the third switching transistor is connected with the second scanning signal end, the first pole of the third switching transistor is connected with the detection line, and the second pole of the third switching transistor is respectively connected with the output end of the driving module and the light-emitting device.
4. A method for detecting the voltage across a light emitting device, applied to the detection of the voltage across the light emitting device in the electroluminescent display panel according to any one of claims 1 to 3, the method comprising:
in a detection stage of a preset detection period, controlling each pixel circuit to charge a connected detection line twice according to a detection data signal corresponding to each pixel circuit, and acquiring a voltage value on the detection line connected with each pixel circuit after each charge; the detection data signal is a signal obtained by compensating the threshold voltage of the driving transistor in the corresponding pixel circuit;
determining the cross voltage of the light-emitting device corresponding to each pixel circuit according to the voltage value obtained in the same detection stage after the detection line connected with each pixel circuit is charged twice;
controlling the pixel circuit to charge the connected detection line each time specifically comprises:
the data writing module provides the signal of the data signal end to the control end of the driving module under the control of a first scanning signal end; the first control module stores the voltage of the control end of the driving module under the control of a second scanning signal end; the second control module conducts the output end of the driving module and a detection line under the control of the second scanning signal end, and provides a reference signal on the detection line to the output end of the driving module;
the driving module generates current under the control of the voltage difference between the control end and the output end of the driving module, and drives the light-emitting device to emit light;
the second control module conducts the output end of the driving module and a detection line under the control of the second scanning signal end, and provides a reference signal on the detection line to the output end of the driving module; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end;
the driving module generates current under the control of a voltage difference between a control end and an output end of the driving module, and the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end to charge the detection line;
determining the cross voltage of the light emitting device corresponding to each pixel circuit according to the following formula:
Figure FDA0002969274690000051
Figure FDA0002969274690000052
wherein, VL-thRepresents the voltage across the light-emitting device, CselA capacitance value, t, representing the detection line1And t2Respectively representing the charging time of the first charging and the charging time of the second charging of the detection lines connected to the same pixel circuit, Vsel-1Representing the detection line at t1Internal charging voltage value, Vsel-2Representing the detection line at t2Internal charging voltage value, Vdata1A voltage value V representing a detection data signal inputted to the pixel circuit connected to the detection linethRepresenting the threshold voltage of the drive transistor in the pixel circuit connected to the detection line, μ representing the mobility of the drive transistor, VrefRepresenting the voltage value, V, of the reference signalssA voltage value representing the second power supply terminal;
Figure FDA0002969274690000061
wherein, CoxRepresents the channel capacitance of the driving transistor, and W/L represents the width-to-length ratio of the driving transistor;
Figure FDA0002969274690000062
wherein, C1A capacitance value, C, representing said first capacitance2Representing the capacitance value of the second capacitor.
5. A method for detecting the voltage across a light emitting device, applied to the detection of the voltage across the light emitting device in the electroluminescent display panel according to any one of claims 1 to 3, the method comprising:
in a detection stage of a preset detection period, controlling each pixel circuit to charge a connected detection line according to a detection data signal corresponding to each pixel circuit, and acquiring a voltage value of the detection line after charging; the detection data signal is a signal obtained by compensating the threshold voltage and the mobility of the driving transistor in the corresponding pixel circuit;
determining the cross voltage of the light-emitting device corresponding to each pixel circuit according to the charged voltage value of the detection line connected with each pixel circuit;
controlling the pixel circuit to charge the connected detection line, specifically comprising:
the data writing module provides the signal of the data signal end to the control end of the driving module under the control of a first scanning signal end; the first control module stores the voltage of the control end of the driving module under the control of a second scanning signal end; the second control module conducts the output end of the driving module and a detection line under the control of the second scanning signal end, and provides a reference signal on the detection line to the output end of the driving module;
the driving module generates current under the control of the voltage difference between the control end and the output end of the driving module, and drives the light-emitting device to emit light;
the second control module conducts the output end of the driving module and a detection line under the control of the second scanning signal end, and provides a reference signal on the detection line to the output end of the driving module; the first control module stores the voltage of the control end of the driving module under the control of the second scanning signal end;
the driving module generates current under the control of a voltage difference between a control end and an output end of the driving module, and the second control module conducts the output end of the driving module and the detection line under the control of the second scanning signal end to charge the detection line;
determining the cross voltage of the light emitting device corresponding to each pixel circuit according to the following formula:
Figure FDA0002969274690000071
wherein, VL-thRepresents the voltage across the light-emitting device, CselA capacitance value, t, representing the detection line3Representing the charging time of the detection line, Vsel-3Representing the detection line at t3Internal charging voltage value, Vdata1A voltage value V representing a detection data signal inputted to the pixel circuit connected to the detection linethRepresenting the threshold voltage of the drive transistor in the pixel circuit connected to the detection line, μ representing the mobility of the drive transistor, VrefVoltage, V, representing a reference signalssA voltage representing the second power supply terminal;
Figure FDA0002969274690000072
wherein, CoxRepresents the channel capacitance of the driving transistor, and W/L represents the width-to-length ratio of the driving transistor;
Figure FDA0002969274690000073
wherein, C1A capacitance value, C, representing said first capacitance2Representing the capacitance value of the second capacitor.
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