Patent Grant
11348536
This application claims the benefit of and priority to Chinese Patent Application No. 202010642375.3, filed on Jul. 6, 2020, the disclosure of which is incorporated herein by reference in its entirety.
The present disclosure relates to the field of display technologies and, in particular, to a detection circuit and a driving method thereof, and a display panel.
After undergoing a cell test, a display panel will be subjected to other processes, such as bonding a gate driving circuit and a source driving circuit, aging processing, shading processing for a fan-shaped wiring area, polarizer attachment, dispensing, packaging, and the like. The above-mentioned processes may cause defects such as line defects and dots defects in the display panel.
It should be noted that the information disclosed in the Background section above is only for enhancing the understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
The present disclosure provides a detection circuit, a driving method thereof, and a display panel.
Other characteristics and advantages of the present disclosure will become apparent through the following detailed description, or be learned partially through the practice of the present disclosure.
According to an aspect of the present disclosure, there is provided a detection circuit applied to a display panel. The display panel includes a first pin group for connecting a first gate driving circuit, a second pin group for bonding a second gate driving circuit, a third pin group for connecting a source driving circuit, and the display panel further includes display sub-pixels. A pixel driving circuit of each of the display sub-pixels includes a switching transistor, a detection transistor, and a driving transistor, a second electrode of the switching transistor being connected to a gate of the driving transistor, a first electrode of the detection transistor being connected to a second electrode of the driving transistor. The first gate driving circuit is configured to provide a gate driving signal to the switching transistor, the second gate driving circuit is configured to provide a gate driving signal to the detection transistor, and the source driving circuit is configured to provide a data signal to the gate of the driving transistor through the switching transistor, where gates of the switching transistors located in a same pixel row are coupled through a first gate line, and gates of the detection transistors located in a same pixel row are coupled through a second gate line, first electrodes of the switching transistors located in a same pixel column are coupled through a first data line, and second electrodes of the detection transistors located in a same pixel column are coupled through a sensing signal line. The first pin group includes a plurality of first pins, the second pin group includes a plurality of second pins, and the third pin group includes a plurality of third pins. The detection circuit includes: a plurality of first detection circuits, a plurality of second detection circuits, and a plurality of third detection circuits. The first detection circuits and the first gate lines are disposed in a one-to-one correspondence, and the first detection circuit is connected to the first pin, a first control signal terminal, a first detection signal terminal and the first gate line corresponding to the first detection circuit, and the first detection circuit is configured to transmit a signal of the first pin to the first detection signal terminal in response to a control signal, and configured to transmit a signal of the first detection signal terminal to the first gate line in response to a signal of the first control signal terminal. The second detection circuits and the second gate lines are disposed in a one-to-one correspondence, and the second detection circuit is connected to the second pin, a second control signal terminal, a second detection signal terminal and the second gate line corresponding to the second detection circuit, and the second detection circuit is configured to transmit a signal of the second pin to the second detection signal terminal in response to a control signal, and configured to transmit a signal of the second detection signal terminal to the second gate line in response to a signal of the second control signal terminal. The third detection circuits are disposed in a one-to-one correspondence with the first data lines and the sensing signal lines located in the same pixel column, and the third detection circuit is connected to the first data line corresponding to the third detection circuit, the sensing signal line corresponding to the third detection circuit, a third detection signal terminal and a third control signal terminal, and is configured to transmit a signal of the third pin to the third detection signal terminal in response to a control signal, and configured to transmit a signal of the third detection signal terminal to the sensing signal line in response to a signal of the third control signal terminal.
In an exemplary embodiment of the present disclosure, the first detection circuit includes a first transistor and a second transistor. A first electrode of the first transistor is connected to the first pin, a second electrode of the first transistor is connected to the first detection signal terminal, and a gate of the first transistor is connected to the first pin. A first electrode of the second transistor is connected to the first detection signal terminal, a second electrode of the second transistor is connected to the first gate line, and a gate of the second transistor is connected to the first control signal terminal.
In an exemplary embodiment of the present disclosure, the second detection circuit includes a third transistor and a fourth transistor. A first electrode of the third transistor is connected to the second pin, a second electrode of the third transistor is connected to the second detection signal terminal, and a gate of the third transistor is connected to the second pin. A first electrode of the fourth transistor is connected to the second detection signal terminal, a second electrode of the fourth transistor is connected to the second gate line, and a gate of the fourth transistor is connected to the second control signal terminal.
In an exemplary embodiment of the present disclosure, the third detection circuit is configured to transmit the signal of the third pin to the third detection signal in response to a signal of the first data line, and the third detection circuit includes: a fifth transistor and a sixth transistor. A first electrode of the fifth transistor is connected to the third pin, a second electrode of the fifth transistor is connected to the third detection signal terminal, and a gate of the fifth transistor is connected to the first data line. A first electrode of the sixth transistor is connected to the sensing signal line, a second electrode of the sixth transistor is connected to the third detection signal terminal, and a gate of the sixth transistor is connected to the third control signal terminal.
In an exemplary embodiment of the present disclosure, the third detection circuit is configured to transmit the signal of the third pin to the third detection signal terminal in response to a signal of a fourth control signal terminal, and the third detection circuit includes: a fifth transistor and a sixth transistor. A first pole of the fifth transistor is connected to the third pin, a second electrode of the fifth transistor is connected to the third detection signal terminal, and a gate of the fifth transistor is connected to the fourth control signal terminal. A first electrode of the sixth transistor is connected to the sensing signal line, a second electrode of the sixth transistor is connected to the third detection signal terminal, and a gate of the sixth transistor is connected to the third control signal terminal.
In an exemplary embodiment of the present disclosure, one or more of the first detection circuits, the second detection circuits, and the third detection circuits are integrated in a dummy pixel area of the display panel.
In an exemplary embodiment of the present disclosure, the plurality of the first detection circuits are connected to the same first control signal terminal; the plurality of the second detection circuits are connected to the same second control signal terminal; and the plurality of the third detection circuits are connected to the same third control signal terminal.
In an exemplary embodiment of the present disclosure, the display panel further includes a plurality of dummy sub-pixels and a plurality of second data lines, and dummy sub-pixels located in a same column are coupled through the second data line, and the plurality of first detection circuits is connected to the same first control signal terminal through a same second data line; and the plurality of second detection circuits are connected to the same second control signal terminal through a same second data line.
In an exemplary embodiment of the present disclosure, the display panel further includes a plurality of dummy sub-pixels and a plurality of third gate lines, and dummy sub-pixels located in a same row are coupled through the third gate line; and the plurality of third detection circuits are connected to the same third control signal terminal through a same third gate line.
In an exemplary embodiment of the present disclosure, the detection circuit further includes: a detection signal determination sub-circuit, connected to the first detection signal terminal, the second detection signal terminal, and the third detection signal terminal, and configured to determine a state of the display panel according to signals of the first detection signal terminal, the second detection signal terminal, and the third detection signal terminal, respectively.
In an exemplary embodiment of the present disclosure, the display panel includes a first wiring area located on one side of the first gate line along an extending direction of the first gate line, and the display panel further includes a first connection line, located in the first wiring area, and the first detection circuit being connected to the first pin through the first connection line. The display panel further includes a second wiring area located on the other side of the first gate line along the extending direction of the first gate line, and the display panel further includes: a second connection line, located in the second wiring area, and the second detection circuit being connected to the second pin through the second connection line. The display panel further includes a third wiring area located on one side of the first data line along an extending direction of the first data line, and the display panel further includes: a third connection line, located in the third wiring area, and the third detection circuit being connected to the third pin through the third connection line.
In an exemplary embodiment of the present disclosure, a first electrode of the driving transistor is connected to a first power source terminal, and the pixel driving circuit further includes a capacitor, coupled between a gate and a second electrode of the driving transistor.
According to an aspect of the present disclosure, there is provided a detection circuit driving method for driving the above detection circuit, and the driving method includes steps described below.
In a first detection stage,
providing a switch-off signal to the first control signal terminal, and connecting the first pin and the first detection signal terminal in response to a control signal, so that a connecting state between the first pin group and the first gate driving circuit is detected through the first detection signal terminal;
providing a switch-off signal to the second control signal terminal, and connecting the second pin and the second detection signal terminal in response to a control signal, so that a connecting state between the second pin group and the second gate driving circuit is detected through the second detection signal terminal; and
providing a switch-off signal to the third control signal terminal, and connecting the third pin and the third detection signal terminal in response to a control signal, so that a connecting state between the third pin group and the source driving circuit is detected through the third detection signal terminal.
In a second detection stage,
providing a switch-on signal to the first control signal terminal, the second control signal terminal, and the third control signal terminal, and connecting the first pin and the first detection signal terminal in response to a control signal, connecting the second pin and the second detection signal terminal in response to a control signal, and connecting the third pin and the third detection signal terminal in response to a control signal, so that a driving state of the display sub-pixel is detected through the third detection signal terminal.
In an exemplary embodiment of the present disclosure, the detection circuit includes a detection signal determination sub-circuit, and the driving method includes:
determining a connecting state between the first pin group and the first gate driving circuit by the detection signal determination sub-circuit;
determining a connecting state between the second pin group and the second gate driving circuit by the detection signal determination sub-circuit; and
determining the driving state of the display sub-pixel by the detection signal determination sub-circuit.
According to an aspect of the present disclosure, there is provided a display panel including the above-mentioned detection circuit.
The present disclosure provides a detection circuit, a driving method thereof, and a display panel. The detection circuit is applied to the display panel. The display panel includes a first pin group for connecting a first gate driving circuit, a second pin group for connecting a second gate driving circuit, a third pin group for connecting a source driving circuit, and the display panel further includes a display sub-pixel, and a pixel driving circuit of the display sub-pixel includes a switching transistor, a detection transistor, and a driving transistor, a second electrode of the switching transistor is connected to a gate of the driving transistor, a first electrode of the detection transistor is connected to a second electrode of the driving transistor, and the first gate driving circuit is configured to provide a gate driving signal to the switching transistor, the second gate driving circuit is configured to provide a gate driving signal to the detection transistor, and the source driving circuit is configured to provide a data signal to the gate of the driving transistor through the switching transistor, wherein gates of the switching transistors located in a same pixel row are coupled through a first gate line, and gates of the detection transistors located in a same pixel row are coupled through a second gate line, first electrodes of the switching transistors located in a same pixel column are coupled through a first data line, and second electrodes of the detection transistors located in a same pixel column are coupled through a sensing signal line, the first pin group includes a plurality of first pins, the second pin group includes a plurality of second pins, and the third pin group includes a plurality of third pins, and the detection circuit includes: a plurality of first detection circuits, a plurality of second detection circuits, and a plurality of third detection circuits. The first detection circuits and the first gate lines are disposed in a one-to-one correspondence, and the first detection circuit is connected to the first pin, a first control signal terminal, a first detection signal terminal and the first gate line corresponding to the first detection circuit, and the first detection circuit is configured to transmit a signal of the first pin to the first detection signal terminal in response to a control signal, and configured to transmit a signal of the first detection signal terminal to the first gate line in response to a signal of the first control signal terminal; the second detection circuits and the second gate lines are disposed in a one-to-one correspondence, and the second detection circuit is connected to the second pin, a second control signal terminal, a second detection signal terminal and the second gate line corresponding to the second detection circuit, and the second detection circuit is configured to transmit a signal of the second pin to the second detection signal terminal in response to a control signal, and configured to transmit a signal of the second detection signal terminal to the second gate line in response to a signal of the second control signal terminal; and the third detection circuits are disposed in a one-to-one correspondence with the first data lines and the sensing signal lines located in the same pixel column, and the third detection circuit is connected to the first data line corresponding to the third detection circuit, the sensing signal line corresponding to the third detection circuit, a third detection signal terminal and a third control signal terminal, and is configured to transmit a signal of the third pin to the third detection signal terminal in response to a control signal, and configured to transmit a signal of the third detection signal terminal to the sensing signal line in response to a signal of the third control signal terminal.
It should be noted that the above general description and the following detailed description are merely exemplary and explanatory and should not be construed as limiting of the disclosure.
The accompanying drawings, which are incorporated in the specification and constitute a part of the specification, show exemplary embodiments of the present disclosure. The drawings along with the specification explain the principles of the present disclosure. It is understood that the drawings in the following description show only some of the embodiments of the present disclosure, and other drawings may be obtained by those skilled in the art without departing from the drawings described herein.
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the embodiments may be implemented in a variety of forms and should not be construed as being limited to the examples set forth herein; rather, these embodiments are provided so that the present disclosure will be more complete so as to convey the idea of the exemplary embodiments to those skilled in this art. The same reference numerals in the drawings denote the same or similar parts, and the repeated description thereof will be omitted.
Although the relative terms such as “above” and “below” are used in the specification to describe the relative relationship of one component to another component shown, these terms are only for convenience in this specification, for example, they are based on an exemplary direction shown in the drawings. It will be understood that if the device shown is flipped upside down, the component described “above” will become the component “below”. Other relative terms, such as “high”, “low”, “top”, “bottom”, “left”, “right”, etc., also have similar meanings. When a structure is “on” another structure, it may mean that a structure is integrally formed on another structure, or that a structure is “directly” disposed on another structure, or that a structure is “indirectly” disposed on another structure through other structures.
The terms “one”, “a”, “the”, and “said”, are used to indicate that there are one or more elements/components or the like; the terms “include”, “contain” and “have” are used to indicate an open meaning of including and means that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms “first”, “second” and “third” etc. are used only as markers, and do not limit the number of objects.
An exemplary embodiment provides a detection circuit that may be applied to a display panel.
In the exemplary embodiment, as shown in
In the exemplary embodiment, as shown in
In the exemplary embodiment, as shown in
In the exemplary embodiment, as shown in
In the exemplary embodiment, the display sub-pixel may refer to a sub-pixel capable of emitting light, which is mainly different from a non-luminous dummy sub-pixel around the display sub-pixel. As shown in
In the exemplary embodiment, a driving method of the detection circuit may include a first detection stage and a second detection stage.
In the first detection stage, a switch-off signal may be input to the first control signal terminal CN1, and the plurality of output terminals of the first gate driving circuit are bonded to the plurality of first pins 11 in the first pin group 1 in a one-to-one correspondence, respectively. A valid level (may be in a high level) may be output to the first pins 11 step by step through the first gate driving circuit. If a certain output terminal of the first gate driving circuit is well bonded with the first pin, the first transistor T1 is turned on through the signal output from the output terminal so that the first pin 11 is connected with the first detection signal terminal SE1. At this time, a level of the first detection signal terminal SE1 is the valid level output by the output terminal. If a certain output terminal of the first gate driving circuit is not well bonded with the first pin 11, the first transistor T1 is not turned on through the signal output from the output terminal, and at this time, the level of the first detection signal terminal SE1 is an invalid level. Therefore, a bonding state between the first gate driving circuit and the first pin group may be detected by detecting the level of the first detection signal terminal.
Similarly, in the first detection stage, a switch-off signal may also be input to the second control signal terminal, and the plurality of output terminals of the second gate driving circuit are bonded to the plurality of second pins 21 in the second pin group 2 in a one-to-one correspondence, respectively. A valid level (may be in a high level) may be output to the second pins 21 step by step through the second gate driving circuit. If a certain output terminal of the second gate driving circuit is well bonded with the second pin 21, the third transistor T3 is turned on through the signal output from the output terminal so that the second pin 21 is connected to the second detection signal terminal SE2. At this time, a level of the second detection signal terminal SE2 is the valid level output by the output terminal. If a certain output terminal of the second gate driving circuit is not well bonded with the second pin 21, the third transistor T3 is not turned on through the signal output from the output terminal, and at this time, a level of the second detection signal terminal SE2 is an invalid level. Therefore, the bonding state between the second gate driving circuit and the second pin group may be detected by detecting the level of the second detection signal terminal SE2.
In the first detection stage, a switch-off signal may also be input to the third control signal terminal, and the plurality of output terminals of the source driving circuit are bonded to the plurality of third pins 31 in the third pin group 3 in a one-to-one correspondence, respectively. A valid level (may be in a high level) may be output to the third pins 31 step by step through the source driving circuit. If a certain output terminal of the source driving circuit is well bonded with the third pin 31, the fifth transistor T5 is turned on through a signal output from the output terminal so that the third pin 31 is connected with the third detection signal terminal SE3. At this time, a level of the third detection signal terminal SE3 is the valid level output by the output terminal. If a certain output terminal of the source driving circuit is not well bonded with the third pin 31, the fifth transistor T5 is not turned on through a signal output from the output terminal, and at this time, a level of the third detection signal terminal SE3 is an invalid level. Therefore, the bonding state between the source driving circuit and the third pin group may be detected by detecting the level of the third detection signal terminal SE3.
In the second detection stage, a switch-on signal may be input to the first control signal terminal, the second control signal terminal, and the third control signal terminal, so that the second transistor T2 in the first detection circuit, the fourth transistors T4 in the second detection circuit, and the sixth transistor T6 in the third detection circuit are turned on. The first gate driving circuit outputs the valid level to the first pin group step by step, the second gate driving circuit outputs the valid level to the second pin group step by step, and the source driving circuit outputs the valid level to the third pin group. The switching transistor T7 in the pixel driving circuit 4 is turned on, the detection transistor T8 is turned on, the valid level output by the source driving circuit turns on the driving transistor DT through the switching transistor T7, and the third detection signal terminal SE3 is connected to the first power source VDD. Therefore, whether the pixel driving circuit is well driven may be detected by detecting the voltage of the third detection signal terminal SE3. For example, if the pixel driving circuit is well driven, the voltage of the third detection signal terminal SE3 should be equal to a voltage of the first power source VDD minus a threshold voltage of the driving transistor DT. Therefore, a detected voltage of the third detection signal terminal SE3 is compared with the above theoretical voltage. If a difference is less than a preset voltage value, it may be considered that the pixel driving circuit is well driven, otherwise the pixel driving circuit is not well driven. For another example, a voltage of a certain third detection signal terminal SE3 may be compared with a voltage of another third detection signal terminal SE3. If a voltage difference between the voltage of the third detection signal terminal SE3 and the voltage of another third detection signal terminal SE3 is less than a preset value, it may be considered that the pixel driving circuit is well driven. Otherwise, the pixel driving circuit is not well driven.
The detection circuit is not only capable of detecting the bonding state of the first gate driving circuit, the second gate driving circuit, and the source driving circuit in the display panel, but also capable of detecting the driving state of display sub-pixels. In addition, the detection circuit may also quickly locate a position of the pixel driving circuit where the driving failure occurs through the positions of the third detection signal terminal SE3, the second detection signal terminal SE2, and the first detection signal terminal SE1.
In the exemplary embodiment, as shown in
In the exemplary embodiment, as shown in
In the exemplary embodiment, as shown in
In the exemplary embodiment, the detection circuit may further include a detection signal determination sub-circuit, connected to the first detection signal terminal SE1, the second detection signal terminal SE2, and the third detection signal terminal SE3. The detection signal determination sub-circuit may determine the bonding state of the first gate driving circuit, the second gate driving circuit, the source driving circuit and the driving state of the pixel driving circuit according to the above defect determination method.
In the exemplary embodiment, as shown in
In the exemplary embodiment, the detection circuit may also be configured to detect the threshold voltage of the driving transistor in the pixel driving circuit.
An exemplary embodiment further provides a detection circuit driving method for driving the above detection circuit, and the driving method includes steps described below.
In a first detection stage,
providing a switch-off signal to the first control signal terminal, and connecting the first pin and the first detection signal terminal in response to a control signal, so that a bonding state between the first pin group and the first gate driving circuit is detected through the first detection signal terminal;
providing a switch-off signal to the second control signal terminal, and connecting the second pin and the second detection signal terminal in response to a control signal, so that a bonding state between the second pin group and the second gate driving circuit is detected through the second detection signal terminal; and
providing a switch-off signal to the third control signal terminal, and connecting the third pin and the third detection signal terminal in response to a control signal, so that a bonding state between the third pin group and the source driving circuit is detected through the third detection signal terminal;
In a second detection stage,
providing a switch-on signal to the first control signal terminal, the second control signal terminal, and the third control signal terminal, and connecting the first pin and the first detection signal terminal in response to a control signal, connecting the second pin and the second detection signal terminal in response to a control signal, and connecting the third pin and the third detection signal terminal in response to a control signal, so that a driving state of the display sub-pixel is detected through the third detection signal terminal.
In an exemplary embodiment of the present disclosure, the detection circuit includes a detection signal determination sub-circuit, and the driving method includes:
determining a bonding state between the first pin group and the first gate driving circuit by the detection signal determination sub-circuit;
determining a bonding state between the second pin group and the second gate driving circuit by the detection signal determination sub-circuit; and
determining the driving state of the display sub-pixel by the detection signal determination sub-circuit.
The detection circuit driving method is described in detail in the above content and will not be repeated here.
An exemplary embodiment further provides a display panel including the above-mentioned detection circuit. The display panel may be used in display devices such as mobile phones, tablet computers, and televisions.
Other embodiments of the present disclosure will be apparent to those skilled in the art after those skilled in the art consider the specification and practice the technical solutions disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present disclosure, which are in accordance with the general principles of the present disclosure and include common general knowledge or conventional technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are illustrative, and the real scope and spirit of the present disclosure is defined by the appended claims.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202010642375.3 | Jul 2020 | CN | national |
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| Number | Date | Country | |
|---|---|---|---|
| 20220005418 A1 | Jan 2022 | US |
