CN114373414B - Display panel electrical property detection circuit and display panel - Google Patents

Display panel electrical property detection circuit and display panel Download PDF

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Publication number
CN114373414B
CN114373414B CN202210054617.6A CN202210054617A CN114373414B CN 114373414 B CN114373414 B CN 114373414B CN 202210054617 A CN202210054617 A CN 202210054617A CN 114373414 B CN114373414 B CN 114373414B
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detection
node
electrically connected
voltage
display panel
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CN114373414A (en
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高磊
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display 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]
    • 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]
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

According to the detection circuit for the electrical property of the display panel and the display panel, the voltage of the first power supply and the voltage of the second node can be detected through the detection module at the same time, so that first detection data can be obtained; and then, carrying out differential calculation on the first detection data, and matching different weights for the voltage of the first power supply and the voltage of the second node, so that the second detection data is not influenced by the voltage of the first power supply, stable second detection data is obtained, then, the threshold voltage and the mobility of the driving transistor are obtained according to the stable second detection data and the data signal, the accurate threshold voltage and mobility of the driving transistor can be obtained, and the data compensation to the driving transistor is ensured to be accurate, thereby being beneficial to improving the display uniformity of the display panel.

Description

Display panel electrical property detection circuit and display panel
Technical Field
The application relates to the technical field of display, in particular to a detection circuit for display panel electrical property and a display panel.
Background
The organic self-luminous display device has higher contrast, more vivid color, light and thin module and random bending property compared with the liquid crystal display device. Accordingly, organic self-luminous display devices have been widely used at present. However, the organic self-luminous display device can only possess the above characteristics because thousands of organic light emitting devices are provided in the organic light emitting display panel.
Among them, in order to control thousands of organic light emitting devices in an organic light emitting display panel, the driving of the organic light emitting devices is generally achieved by controlling the current of a thin film transistor using a voltage. Unlike liquid crystal devices, which have high requirements on the stability and uniformity of the thin film transistor, the current of the organic light emitting diode is required to continuously flow through the driving transistor as long as the pixel emits light, rather than just a role of a switch, and this continuous voltage output is a great challenge for the stability of the thin film transistor. Therefore, it is generally difficult to maintain uniformity and stability of the driving transistor in a practical process, and electrical variation of the driving transistor is directly reflected on a display effect, so that sensing and compensation of the electrical characteristics of the driving transistor must be performed in a manner.
At present, detection of threshold voltage and mobility is generally realized through a detection transistor, then a detection result is calculated through a driving algorithm, and finally the detection result is compensated to each driving transistor to realize the compensation of the driving transistor. Although the uniformity and stability of the display can be greatly improved in this way, since the potential stability of the detection point Vs needs to be ensured in the detection process, the fluctuation of the power supply signal OVDD directly interferes with the potential of the detection point Vs at this time, so that the detected data is abnormal, the data compensated to the driving transistor is abnormal, and the display of the organic self-luminous display device is abnormal.
Therefore, how to provide a circuit for detecting the electrical property of a display panel and a display panel, which reduce or even eliminate the influence of the fluctuation of the power supply signal OVDD on the electric potential of the detection point Vs, and obtain accurate detection data is a difficulty that the existing panel manufacturers need to struggle. .
Disclosure of Invention
An objective of the present embodiment is to provide a detection circuit for electrical property of a display panel and a display panel, which can solve the technical problem that fluctuation of a power supply signal OVDD interferes with the potential of a detection point Vs, thereby making detected data abnormal.
The embodiment of the application provides a detection circuit for the electrical property of a display panel, which comprises:
a driving transistor, wherein a gate of the driving transistor is electrically connected to the first node, one of a source and a drain of the driving transistor is electrically connected to the first power supply, and the other of the source and the drain of the driving transistor is electrically connected to the second node;
the anode of the light-emitting device is electrically connected with the second node, and the cathode of the light-emitting device is electrically connected with a second power supply;
the first end of the capacitor is electrically connected with the first node, and the second end of the capacitor is electrically connected with the second node; and
the writing module is connected with a data signal and a scanning signal and is electrically connected with the first node, and the writing module is used for conveying the data signal to the first node under the control of the scanning signal;
the detection module is electrically connected to the first power supply and the second node, and is used for detecting the voltage of the first power supply and the voltage of the second node at the same time to obtain first detection data, performing differential calculation on the first detection data to obtain second detection data, and obtaining the threshold voltage and mobility of the driving transistor according to the second detection data and the data signal.
In the electrical detection circuit of the display panel, the detection module includes a detection unit, a first calculation unit and a second calculation unit, the detection unit is electrically connected to the first power supply, the second node and the first calculation unit, the first calculation unit is electrically connected to the second calculation unit, the detection unit is configured to detect the voltage of the first power supply and the voltage of the second node at the same time so as to obtain first detection data, the first calculation unit is configured to perform differential calculation on the first detection data so as to obtain second detection data, and the second calculation unit is configured to obtain the threshold voltage and the mobility of the driving transistor according to the second detection data and the data signal.
In the electrical detection circuit of the display panel, the detection unit comprises a first detection subunit and a second detection subunit, the first detection subunit is electrically connected with the first power supply and the first calculation unit, the second detection subunit is electrically connected with the second node and the second calculation unit, the first detection subunit is used for detecting the voltage of the first power supply, and the second detection subunit is used for detecting the voltage of the second node.
In the electrical detection circuit of the display panel, the detection module further includes a detection transistor, a gate of the detection transistor is connected to a detection signal, one of a source and a drain of the detection transistor is electrically connected to the second node, and the other of the source and the drain of the detection transistor is electrically connected to the second detection subunit.
In the electrical detection circuit of the display panel, the detection module further comprises a switching element, an input end of the switching element is electrically connected to one of a source electrode and a drain electrode of the detection transistor, a first output end of the switching element is electrically connected to the second detection subunit, and a second output end of the switching element is connected to a reset signal.
In the electrical detection circuit of a display panel, the writing module includes a writing transistor, a gate of the writing transistor is connected to the scanning signal, one of a source and a drain of the writing transistor is connected to the data signal, and the other of the source and the drain of the writing transistor is electrically connected to the first node.
In the electrical property detection circuit of a display panel described in the present application, the calculation formula of the second detection data is: v (V) 0 ＝a*V OVDD -b*V S Wherein V is 0 For the second detection data, V OVDD At the voltage of the first power supply, V S A is a voltage of the second node, a is a first weight value, and b is a second weight value.
In the electrical detection circuit of the display panel, the display panel comprises a plurality of pixel units which are arranged in an array, each pixel unit corresponds to one detection module, and the plurality of detection modules share one first power supply sampling point.
In the electrical property detection circuit of the display panel, the display panel comprises a plurality of pixel units which are arranged in an array, each pixel unit corresponds to one detection module, and each detection module independently adopts a first power supply sampling point.
The embodiment of the application also provides a display panel, which comprises a plurality of pixel units arranged in an array, wherein each pixel unit is provided with the detection circuit for the electrical property of the display panel.
In the detection circuit for the electrical property of the display panel and the display panel provided by the embodiment of the application, the detection circuit comprises a driving transistor, a light emitting device, a capacitor, a writing module and a detection module, wherein the detection module can be used for simultaneously detecting the voltage of a first power supply and the voltage of a second node to obtain first detection data; and then, carrying out differential calculation on the first detection data, and matching different weights for the voltage of the first power supply and the voltage of the second node, so that the second detection data is not influenced by the voltage of the first power supply, stable second detection data is obtained, then, the threshold voltage and the mobility of the driving transistor are obtained according to the stable second detection data and the data signal, the accurate threshold voltage and mobility of the driving transistor can be obtained, and the data compensation to the driving transistor is ensured to be accurate, thereby being beneficial to improving the display uniformity of the display panel.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a first embodiment of a detection circuit for detecting an electrical property of a display panel according to an embodiment of the present application.
Fig. 2 is a circuit diagram of a first embodiment of a detection circuit for detecting an electrical property of a display panel according to an embodiment of the present application.
Fig. 3 is a circuit diagram of a second implementation of the electrical detection circuit for a display panel according to the embodiment of the present application.
Fig. 4 is a circuit diagram of a third embodiment of a detection circuit for electrical properties of a display panel according to an embodiment of the present application.
Fig. 5 is a circuit diagram of a fourth implementation of the electrical detection circuit for a display panel according to the embodiment of the present application.
Fig. 6 is a circuit diagram of a fifth embodiment of a detection circuit for detecting the electrical property of a display panel according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of a display panel according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The transistors used in all embodiments of the present application may be thin film transistors or field effect transistors or other devices with the same characteristics, and the source and drain of the transistors used herein are symmetrical, so that the source and drain may be interchanged. In the embodiment of the present application, to distinguish between two electrodes of the transistor except the gate, one electrode is referred to as a source electrode and the other electrode is referred to as a drain electrode. The middle terminal of the switching transistor is defined as a gate, the signal input terminal is defined as a source, and the output terminal is defined as a drain according to the form in the figure. In addition, the transistor adopted in the embodiment of the present application is an N-type transistor, where the N-type transistor is turned on when the gate is at a high level and turned off when the gate is at a low level.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a first implementation of a detection circuit for detecting an electrical property of a display panel according to an embodiment of the present application. As shown in fig. 1, the light emitting device driving circuit 10 provided in the embodiment of the present application includes a driving transistor T1, a light emitting device D, a capacitor C, a writing module 101, and a detecting module 102. It should be noted that the light emitting device D may be a mini light emitting diode, a micro light emitting diode, or an organic light emitting diode.
The gate of the driving transistor T1 is electrically connected to the first node P, one of the source and the drain of the driving transistor T1 is electrically connected to the first power source OVDD, and the other of the source and the drain of the driving transistor T1 is electrically connected to the second node S. The anode of the light emitting device D is electrically connected to the second node S, and the cathode of the light emitting device is electrically connected to the second power supply OVSS. The first end of the capacitor C is electrically connected to the first node P, and the second end of the capacitor C is electrically connected to the second node S. The writing module 101 is connected to the data signal Gate and the scan signal Gate, and is electrically connected to the first node P. The detection module 102 is electrically connected to the first power OVDD and the second node S.
It should be noted that, in the embodiment of the present application, the light emitting device D is only required to be connected in series to the light emitting circuit, and the light emitting device driving circuit 10 shown in fig. 1 only illustrates a specific position of the light emitting device D. That is, the light emitting device D may be connected in series at any position on the light emitting circuit.
Specifically, the driving transistor T1 is used to control the current flowing through the light emitting circuit. The writing module 101 is configured to send a data signal Date to the first node P under the control of the scan signal Gate. The detection module 102 is configured to detect a voltage of the first power OVDD and a voltage of the second node S at the same time to obtain first detection data; and is also used for carrying out differential calculation on the first detection data to obtain second detection data V 0 And is also used for detecting data V according to the second 0 And the data signal Gate acquires the threshold voltage and mobility of the driving transistor T1.
The calculation formula of the second detection data is as follows: v (V) 0 ＝a*V OVDD -b*V S Wherein V is 0 For the second detection data, V OVDD At the voltage of the first power supply, V S A is a voltage of the second node, a is a first weight value, and b is a second weight value.
Specifically, the electrical detection circuit 10 of the display panel provided in the embodiments of the present application can detect the voltage of the first power OVDD and the voltage of the second node S through the detection module 102 at the same time, so as to obtain first detection data; then, the difference calculation is carried out on the first detection data, and the voltage of the first power supply OVDD and the voltage of the second node are matched with different weights a and b, thereby enabling the second detection data V 0 Is not affected by the first power voltage OVDD to obtain a stable second detectionMeasurement data V 0 Then according to the stable second detection data V 0 And the data signal Date is used for acquiring the threshold voltage and mobility of the driving transistor T1, so that the accurate threshold voltage and mobility of the driving transistor T1 can be acquired, the accuracy of data compensated to the driving transistor T1 is ensured, and the display uniformity of the display panel is improved.
It should be noted that, the specific values of the weights a and b may be obtained by measuring the voltages of the plurality of groups of the first power OVDD and the voltage of the second node S, because the second detection data V obtained by the detection circuit 10 for detecting the electrical property of the display panel according to the embodiment of the present application 0 Is a stable value, and thus, specific values that can be obtained for the weights a and b are obtained by measuring the voltages of the plurality of sets of first power OVDD and the voltage of the second node S.
The calculation formula of the second detection data may be:
Figure BDA0003475931770000061
wherein V is 0 For the second detection data, V OVDD At the voltage of the first power supply, V S A is the voltage of the second node, a is the first weight value, b is the second weight value, V offset Is the offset.
It should be noted that, since the voltage of the second power supply OVSS also affects the voltage V of the second node S Therefore, V needs to be set offset To obtain the voltage V of the second node with higher accuracy S . Specifically, V offset The value range of the voltage V is that of the second power supply OVSS ovss Voltage V with first power supply OVDD OVDD Between them.
The display panel comprises a plurality of pixel units arranged in an array manner, wherein each pixel unit corresponds to one pixel unit
A detection module 102.
In one embodiment, the plurality of detection modules 102 share a first power sampling point. Specifically, the plurality of detection modules 102 share a first power sampling point, so as to reduce the detection time and improve the electrical detection efficiency of the display panel.
In one embodiment, each detection module 102 independently employs a first power sampling point. Specifically, each detection module 102 independently adopts a first power supply sampling point, so that the detection module 102 can correspondingly acquire the voltage of the first power supply OVDD corresponding to each pixel unit, thereby enabling the voltage of the first power supply OVDD acquired by the detection module 102 to be more accurate, being beneficial to improving the accuracy of the calculated threshold voltage and mobility of the driving transistor T1, ensuring the accuracy of data compensated to the driving transistor T1, and being beneficial to improving the uniformity of display of the display panel.
Referring to fig. 2, fig. 2 is a circuit schematic diagram of a first implementation of a driving circuit of a light emitting device according to an embodiment of the present application. As shown in fig. 1 and 2, the writing module 101 includes a writing transistor T2. The Gate of the writing transistor T2 is connected to the scan signal Gate, one of the source and the drain of the writing transistor T2 is connected to the data signal Gate, and the other of the source and the drain of the writing transistor T2 is electrically connected to the first node P.
Referring to fig. 3, fig. 3 is a schematic circuit diagram of a second implementation of a driving circuit of a light emitting device according to an embodiment of the present application. As shown in fig. 3, the detection module 102 provided in the embodiment of the present application includes a detection unit 1021, a first calculation unit 1022 and a second calculation unit 1023. The detecting unit 1021 is electrically connected to the first power OVDD, the second node S, and the first computing unit 1022. The first computing unit 1022 is electrically connected to the second computing unit 1023.
The detecting unit 1021 is configured to detect the voltage of the first power OVDD and the voltage of the second node S at the same time, so as to obtain first detection data. The first computing unit 1022 is configured to perform differential computation on the first detection data to obtain second detection data V S . The second computing unit 1023 is configured to generate second detection data V S And the data signal Date acquires the threshold voltage and mobility of the driving transistor T1.
Referring to fig. 4, fig. 4 is a schematic circuit diagram of a third implementation of a driving circuit of a light emitting device according to an embodiment of the present application. As shown in fig. 4, the detection unit 1021 includes a first detection subunit 1021a and a second detection subunit 1021b. The first detection subunit 1021a is electrically connected to the first power supply OVDD and the first computing unit 1022. The second detection subunit 1021b is electrically connected to the second node S and the second computing unit 1023.
It should be noted that, the first detecting subunit 1021a is configured to detect a voltage of the first power supply OVDD. The second detecting subunit 1021b is configured to detect a voltage of the second node S. Specifically, two different detection subunits are adopted to detect the voltage of the first power supply OVDD and the voltage of the second node S respectively, so that mutual influence between the two can be avoided, and accuracy of the obtained voltage of the first power supply OVDD and the obtained voltage of the second node S can be improved.
Referring to fig. 5, fig. 5 is a circuit schematic diagram of a fourth implementation of a light emitting device driving circuit according to an embodiment of the present application. As shown in fig. 5, the detection module 102 further includes a detection transistor T3. The gate of the detection transistor T3 is connected to the detection signal Sense, one of the source and the drain of the detection transistor T3 is electrically connected to the second node S, and the other of the source and the drain of the detection transistor T3 is electrically connected to the second detection subunit 1021b.
It should be noted that, by providing the detection transistor T3, the detection of the second detection subunit 1021b can be controlled, and when the voltage of the second node S needs to be detected, the detection transistor T3 is turned on, so as to avoid the second detection subunit 1021b from detecting inaccurate detection data.
It should be noted that the driving transistor T1, the detecting transistor T3, and the writing transistor T2 may be one or more of a low temperature polysilicon thin film transistor, an oxide semiconductor thin film transistor, or an amorphous silicon thin film transistor. Further, the transistors in the detecting circuit 10 for display panel electrical property provided in the embodiment of the present application may be set to be the same type of transistors, so as to avoid the influence of the difference between the different types of transistors on the detecting circuit 10 for display panel electrical property.
Referring to fig. 6, fig. 6 is a circuit schematic diagram of a fifth implementation of a light emitting device driving circuit according to an embodiment of the present application. As shown in fig. 5, the detection module 102 further includes a switching element G. The input end of the switching element G is electrically connected to one of the source and the drain of the detection transistor T3, the first output end of the switching element G is electrically connected to the second detection subunit 1021b, and the second output end of the switching element G is connected to the reset signal Vref.
It should be noted that, by providing the switching element G, and electrically connecting the first output terminal of the switching element G to the second detection subunit 1021b, the second output terminal of the switching element G is connected to the reset signal Vref. When the second node S needs to be reset, the input terminal of the switching element G is connected to the second output terminal, so that the reset signal Vref can be output to the second node S through the detection transistor T3 to reset the second node S. When the voltage of the second node S needs to be detected normally, the input terminal of the switching element G is connected to the first output terminal, so that the second detecting subunit 1021b can detect the voltage of the second node S through the detecting transistor T3.
In the detection circuit for the electrical property of the display panel provided by the embodiment of the application, the voltage of the first power supply and the voltage of the second node can be detected through the detection module at the same time, so as to obtain first detection data; and then, carrying out differential calculation on the first detection data, and matching different weights for the voltage of the first power supply and the voltage of the second node, so that the second detection data is not influenced by the voltage of the first power supply, stable second detection data is obtained, then, the threshold voltage and the mobility of the driving transistor are obtained according to the stable second detection data and the data signal, the accurate threshold voltage and mobility of the driving transistor can be obtained, and the data compensation to the driving transistor is ensured to be accurate, thereby being beneficial to improving the display uniformity of the display panel.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a display panel according to an embodiment of the disclosure. The embodiment of the present application further provides a display panel 200, including a plurality of pixel units 2000 arranged in an array, where each pixel unit 2000 includes the above-mentioned detecting circuit 10 for the electrical property of the display panel, and the above description of the detecting circuit 10 for the electrical property of the display panel may be referred to specifically, and will not be repeated herein.
In the display panel provided by the embodiment of the application, the voltage of the first power supply and the voltage of the second node can be detected simultaneously by the detection module so as to obtain the first detection data; and then, carrying out differential calculation on the first detection data, and matching different weights for the voltage of the first power supply and the voltage of the second node, so that the second detection data is not influenced by the voltage of the first power supply, stable second detection data is obtained, then, the threshold voltage and the mobility of the driving transistor are obtained according to the stable second detection data and the data signal, the accurate threshold voltage and mobility of the driving transistor can be obtained, and the data compensation to the driving transistor is ensured to be accurate, thereby being beneficial to improving the display uniformity of the display panel.
The foregoing has described in detail the detection circuit for electrical properties of a display panel and the display panel provided in the embodiments of the present application, and specific examples have been applied to illustrate the principles and embodiments of the present application, and the description of the foregoing examples is only for aiding in understanding the method and core idea of the present application; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.

Claims (10)

1. A detection circuit for electrical property of display panel is characterized in that the detection circuit comprises:
a driving transistor, wherein a gate of the driving transistor is electrically connected to the first node, one of a source and a drain of the driving transistor is electrically connected to the first power supply, and the other of the source and the drain of the driving transistor is electrically connected to the second node;
the anode of the light-emitting device is electrically connected with the second node, and the cathode of the light-emitting device is electrically connected with a second power supply;
the first end of the capacitor is electrically connected with the first node, and the second end of the capacitor is electrically connected with the second node;
the writing module is connected with a data signal and a scanning signal and is electrically connected with the first node, and the writing module is used for conveying the data signal to the first node under the control of the scanning signal; and
the detection module is electrically connected to the first power supply and the second node, and is used for detecting the voltage of the first power supply and the voltage of the second node at the same time to obtain first detection data, performing differential calculation on the first detection data to obtain second detection data, and obtaining the threshold voltage and mobility of the driving transistor according to the second detection data and the data signal.
2. The electrical detection circuit of claim 1, wherein the detection module comprises a detection unit, a first calculation unit and a second calculation unit, the detection unit is electrically connected to the first power supply, the second node and the first calculation unit, the first calculation unit is electrically connected to the second calculation unit, the detection unit is configured to detect a voltage of the first power supply and a voltage of the second node at the same time to obtain first detection data, the first calculation unit is configured to perform differential calculation on the first detection data to obtain second detection data, and the second calculation unit is configured to obtain a threshold voltage and mobility of the driving transistor according to the second detection data and the data signal.
3. The electrical detection circuit of claim 2, wherein the detection unit comprises a first detection subunit and a second detection subunit, the first detection subunit is electrically connected to the first power supply and the first computing unit, the second detection subunit is electrically connected to the second node and the second computing unit, the first detection subunit is configured to detect a voltage of the first power supply, and the second detection subunit is configured to detect a voltage of the second node.
4. The circuit of claim 3, wherein the detection module further comprises a detection transistor, a gate of the detection transistor is connected to a detection signal, one of a source and a drain of the detection transistor is electrically connected to the second node, and the other of the source and the drain of the detection transistor is electrically connected to the second detection subunit.
5. The circuit of claim 4, wherein the detecting module further comprises a switching element, an input terminal of the switching element is electrically connected to one of a source and a drain of the detecting transistor, a first output terminal of the switching element is electrically connected to the second detecting subunit, and a second output terminal of the switching element is connected to a reset signal.
6. The circuit of claim 1, wherein the write module comprises a write transistor, a gate of the write transistor is connected to the scan signal, one of a source and a drain of the write transistor is connected to the data signal, and the other of the source and the drain of the write transistor is electrically connected to the first node.
7. The electrical property detection circuit of the display panel according to claim 1, wherein the calculation formula of the second detection data is: v (V) 0 ＝a*V OVDD -b*V s Wherein V is 0 For the second detection data, V OVDD At the voltage of the first power supply, V S A is a voltage of the second node, a is a first weight value, and b is a second weight value.
8. The electrical detection circuit of claim 1, wherein the display panel comprises a plurality of pixel units arranged in an array, each pixel unit corresponds to one detection module, and the plurality of detection modules share a first power supply sampling point.
9. The electrical detection circuit of claim 1, wherein the display panel comprises a plurality of pixel units arranged in an array, each pixel unit corresponds to one detection module, and each detection module independently adopts a first power supply sampling point.
10. A display panel, comprising a plurality of pixel units arranged in an array, wherein each pixel unit comprises the electrical detection circuit of the display panel according to any one of claims 1 to 9.
CN202210054617.6A 2022-01-18 2022-01-18 Display panel electrical property detection circuit and display panel Active CN114373414B (en)

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CN107358915A (en) * 2017-08-11 2017-11-17 上海天马有机发光显示技术有限公司 A kind of image element circuit, its driving method, display panel and display device
CN107767814A (en) * 2017-11-27 2018-03-06 合肥鑫晟光电科技有限公司 Image element circuit, display device and double grid driving transistor
CN109523952A (en) * 2019-01-24 2019-03-26 京东方科技集团股份有限公司 A kind of pixel circuit and its control method, display device
CN110706641A (en) * 2019-09-16 2020-01-17 深圳市华星光电半导体显示技术有限公司 Pixel driving circuit and display device
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CN105788530A (en) * 2016-05-18 2016-07-20 深圳市华星光电技术有限公司 Threshold voltage detection circuit for OLED display devices
CN107358915A (en) * 2017-08-11 2017-11-17 上海天马有机发光显示技术有限公司 A kind of image element circuit, its driving method, display panel and display device
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