CN111261114A - Display panel and pixel compensation circuit - Google Patents
Display panel and pixel compensation circuit Download PDFInfo
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- CN111261114A CN111261114A CN202010219884.5A CN202010219884A CN111261114A CN 111261114 A CN111261114 A CN 111261114A CN 202010219884 A CN202010219884 A CN 202010219884A CN 111261114 A CN111261114 A CN 111261114A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- 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
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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
- 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
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Abstract
The invention discloses a display panel and a pixel compensation circuit, comprising: a pixel circuit and an external circuit for maintaining the brightness of the display screen uniform by compensation; the external circuit includes a first external circuit and a second external circuit; the first external circuit is connected to a data signal terminal of the pixel circuit, and the second external circuit is connected to an output terminal of the pixel circuit. Therefore, the threshold voltage of the driving transistor is compensated through the potential change of the pixel circuit and the external circuit, the brightness change caused by the aging of the light emitting diode is compensated, the data line and the sensing line are collinear, the circuit number of half of the integrated circuit is reduced, high-resolution display can be realized, and the user experience is effectively improved.
Description
Technical Field
The invention relates to the technical field of display control, in particular to a display panel and a pixel compensation circuit.
Background
The flexible Organic Light-Emitting Diode (OLED) display panel has the advantages of high contrast, high color gamut, high color saturation, wide viewing angle, low power consumption, etc., and is widely applied to the next generation of display devices, the electrical property of the thin film transistor elements of the active matrix Organic Light-Emitting Diode display directly affects the gray scale brightness difference due to the current-driven Light-Emitting characteristic, and when the electrical property difference of the thin film transistor elements in different sub-pixels is too large, the image quality is not uniform, such as: the mura phenomenon occurs.
Therefore, the problem of how to improve the brightness uniformity of the whole display screen is a problem that needs to be solved urgently by OLED products.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, a first object of the present invention is to provide a pixel compensation circuit, which designs a pixel circuit and an external circuit to improve luminance uniformity of an entire display screen by compensating for a threshold voltage of a driving transistor and luminance variation due to aging of a light emitting diode.
A second object of the present invention is to provide a display panel.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a pixel compensation circuit, including: a pixel circuit and an external circuit for maintaining the brightness of the display screen uniform by compensation; the external circuit includes a first external circuit and a second external circuit; the first external circuit is connected with a data signal end of the pixel circuit, and the second external circuit is connected with an output end of the pixel circuit.
According to the pixel compensation circuit of the embodiment of the invention, the first external circuit is connected with the data signal end of the pixel circuit, and the second external circuit is connected with the output end of the pixel circuit. The threshold voltage of the driving transistor is compensated through the potential change of the pixel circuit and an external circuit, the brightness change caused by the aging of the light emitting diode is compensated, the data line and the sensing line are collinear, the circuit number of half of an integrated circuit is reduced, high-resolution display can be realized, the high-resolution display circuit is applied to a display with high pixel density, and the user experience is effectively improved.
According to an embodiment of the present invention, the pixel circuit includes: the light-emitting diode comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a capacitor and a light-emitting diode; the grid electrode of the first transistor is connected with the first end of the capacitor and the drain electrode of the second transistor, the source electrode of the first transistor is connected with the second end of the capacitor and the anode of the light-emitting diode, and the drain electrode of the first transistor is connected with the source electrode of the fourth transistor; the grid electrode of the second transistor is connected with the first driving signal end, the source electrode of the second transistor is connected with the reference voltage, and the drain electrode of the second transistor is connected with the first end of the capacitor; the grid electrode of the third transistor is connected with a second driving signal end, the source electrode of the third transistor is connected with the data signal end, and the drain electrode of the third transistor is connected with the second end of the capacitor, the anode of the light-emitting diode and the source electrode of the first transistor; the grid electrode of the fourth transistor is connected with the third driving signal end, and the drain electrode of the fourth transistor is connected with the first power supply input end; and the anode of the light emitting diode is connected with the second end of the capacitor, and the cathode of the light emitting diode is the output end of the pixel circuit.
According to one embodiment of the present invention, the first external circuit includes: a fifth transistor and a sixth transistor; the grid electrode of the fifth transistor is connected with a sensing signal end, and the drain electrode and the source electrode are respectively connected with a second power supply input end and the data signal end and are used for resetting the data signal end; the grid electrode of the sixth transistor is connected with a reset signal end, and the drain electrode and the source electrode are respectively connected with a third power input end and the data signal end and are used for carrying out sensing sampling on the data signal end; the second external circuit includes: a seventh transistor and an eighth transistor; the grid electrode of the seventh transistor is connected with the induction signal end, and the drain electrode and the source electrode are respectively connected with the fourth power input end and the cathode of the light-emitting diode and used for switching the potential of the cathode of the light-emitting diode to a high potential; and the grid electrode of the eighth transistor is connected with the display signal end, and the drain electrode and the source electrode are respectively connected with the fifth power input end and the cathode of the light-emitting diode and are used for switching the potential of the cathode of the light-emitting diode to a low potential.
According to an embodiment of the present invention, the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, and the eighth transistor are all N-channel transistors.
According to an embodiment of the present invention, in a reset phase of compensating for a threshold voltage of the first transistor, the first driving signal terminal, the second driving signal terminal, the reset signal terminal, and the sensing signal terminal are at a first level, the third driving signal terminal, the sensing signal terminal, and the display signal terminal are at a second level, and the first level and the second level are opposite;
an extraction stage for compensating the threshold voltage of the first transistor, wherein the first driving signal terminal, the second driving signal terminal, the third driving signal terminal and the sensing signal terminal are at the first level, and the sensing signal terminal, the reset signal terminal and the display signal terminal are at the second level;
and in a sampling stage of compensating the threshold voltage of the first transistor, the second driving signal end, the third driving signal end, the sensing signal end and the sensing signal end are at a first level, and the first driving signal end, the reset signal end and the display signal end are at a second level.
According to an embodiment of the present invention, in a reset phase of compensating for an anode point potential of the light emitting diode, the first driving signal terminal, the second driving signal terminal, the reset signal terminal and the display signal terminal are at a first level, the third driving signal terminal, the sensing signal terminal and the sensing signal terminal are at a second level, and the first level and the second level are opposite;
an extraction stage for compensating the anode point potential of the light emitting diode, wherein the second driving signal end, the third driving signal end and the display signal end are at the first level, and the first driving signal end, the sensing signal end, the reset signal end and the sensing signal end are at the second level;
and in a sampling stage for compensating the anode point potential of the light emitting diode, the second driving signal end, the third driving signal end, the sensing signal end and the sensing signal end are in a first level, and the first driving signal end, the reset signal end and the display signal end are in a second level.
According to an embodiment of the present invention, the pixel circuit is in a display mode, in the gate reset phase and the data write phase of the first transistor, the first driving signal terminal and the second driving signal terminal are at a first level, the third driving signal terminal, the sensing signal terminal, the reset signal terminal, the sensing signal terminal and the display signal terminal are at a second level, and the first level and the second level are opposite;
in the light emitting stage of the light emitting diode, the third driving signal end and the display signal end are at the first level, and the first driving signal end, the second driving signal end, the sensing signal end, the reset signal end and the sensing signal end are at the second level.
According to an embodiment of the invention, the fourth transistor is removed and the first transistor drain is connected to the first power supply input.
According to an embodiment of the invention, the transistor gate is connected to the third transistor gate.
In order to achieve the above object, a second embodiment of the present invention provides a display panel, which includes: the pixel compensation circuit is described above.
According to the display panel of the embodiment of the invention, through the pixel compensation circuit, the first external circuit is connected with the data signal end of the pixel circuit, and the second external circuit is connected with the output end of the pixel circuit. The threshold voltage of the driving transistor is compensated through the potential change of the pixel circuit and an external circuit, the brightness change caused by the aging of the light emitting diode is compensated, the data line and the sensing line are collinear, the circuit number of half of an integrated circuit is reduced, high-resolution display can be realized, the high-resolution display circuit is applied to a display with high pixel density, and the user experience is effectively improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a pixel compensation circuit according to an embodiment of the present invention;
FIG. 2 is a waveform diagram of an off-voltage extraction driving signal of a driving transistor in a sensing mode of a pixel circuit according to one embodiment of the present invention;
FIG. 3 is a waveform of an anode point potential extraction driving signal for a light emitting diode device in a pixel circuit sensing mode according to an embodiment of the present invention;
FIG. 4 is a waveform diagram of driving signals in a display mode of a pixel circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a pixel compensation circuit according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a pixel compensation circuit according to still another embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a display panel and a pixel compensation circuit according to embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a pixel compensation circuit according to an embodiment of the invention. As shown in fig. 1, the pixel driving circuit of the light emitting diode includes: and the pixel circuit and the external circuit are used for keeping the brightness of a display picture uniform through compensation. The external circuit includes a first external circuit and a second external circuit; the first external circuit is connected to a data signal terminal of the pixel circuit, and the second external circuit is connected to an output terminal of the pixel circuit.
As shown in fig. 1, the pixel circuit includes four transistors: the driving circuit comprises a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a capacitor Cst, a light emitting diode OLED, and 6 signal terminals, wherein the 6 signal terminals are respectively a reference voltage Vref, a first driving signal terminal Scan1, a second driving signal terminal Scan2, a third driving signal terminal EM, a Data signal terminal Data, and a first power input terminal VDD.
In an embodiment of the invention, the Light Emitting Diode is an Organic Light-Emitting Diode (OLED).
According to an embodiment of the present invention, the first Transistor T1 is a driving Transistor (DTFT), and the second Transistor T2, the third Transistor T3, and the fourth Transistor T4 are switching transistors (STFT).
Further, as shown in fig. 1, according to an embodiment of the present invention, the gate of the first transistor TI is connected to the first terminal (one terminal of the N1 node in fig. 1) of the capacitor Cst and the drain of the second transistor T2, the source is connected to the second terminal (one terminal of the N2 node in fig. 1) of the capacitor Cst and the anode of the light emitting diode OLED, and the drain is connected to the source of the fourth transistor T4; the gate of the second transistor T2 is connected to the first driving signal terminal Scan1, the source is connected to the reference voltage Vref, and the drain is connected to the first terminal of the capacitor Cst; the gate of the third transistor T3 is connected to the second driving signal terminal Scan2, the source is connected to the Data signal terminal Data, and the drain is connected to the second terminal of the capacitor Cst, the anode of the light emitting diode OLED, and the source of the first transistor T1; a gate electrode of the fourth transistor T4 is connected to the third driving signal terminal EM, and a drain electrode thereof is connected to the first power input terminal VDD; the anode of the light emitting diode OLED is connected to the second end of the capacitor Cst, and the cathode is the output terminal of the pixel circuit.
Further, according to an embodiment of the present invention, the external circuit includes a first external circuit and a second external circuit. It is composed of four transistors, a fifth transistor T5, a sixth transistor T6, a seventh transistor T7, and an eighth transistor T8.
Wherein the first external circuit includes: a fifth transistor T5 and a sixth transistor T6.
The fifth transistor T5 has a gate connected to the sensing signal terminal Sen, and a drain and a source connected to the second power input terminal Vsen and the Data signal terminal Data, respectively, for resetting the Data signal terminal and the Data. The sixth transistor T6 has a gate connected to the reset signal terminal RST, and a drain and a source connected to the third power input terminal Vint and the Data signal terminal Data, respectively, for performing sensing sampling on the Data signal terminal.
The second external circuit includes: a seventh transistor T7 and an eighth transistor T8.
The seventh transistor T7 has a gate connected to the sensing signal terminal Sense, and a drain and a source respectively connected to the fourth power input terminal VDD and the cathode of the light emitting diode OLED for switching the cathode potential of the light emitting diode to a high potential. The eighth transistor T8 has a gate connected to the Display signal terminal Display, a drain and a source respectively connected to the fifth power input terminal Vss and the cathode of the light emitting diode OLED for switching the cathode potential of the light emitting diode to a low potential.
According to an embodiment of the present invention, the transistors in the pixel circuit and the external circuit are both N-channel type TFTs (thin film transistors, abbreviated as TFTs).
Fig. 2 is a waveform diagram of an off-voltage extraction driving signal of a driving transistor in a sensing mode of a pixel circuit according to an embodiment of the present invention. As shown in fig. 2, when the pixel circuit is in a sensing (Sense) mode of DTFT Vth, the threshold voltage Vth of the first transistor T1 is compensated, which includes three stages, as follows.
A reset stage: the reset signal terminal RST, the sensing signal terminal Sense, the first driving signal terminal Scan1, and the second driving signal terminal Scan2 are at a first level (the first level may be a high level), the sensing signal terminal Sen, the Display signal terminal Display, and the third driving signal terminal EM are at a second level (the first level is opposite to the second level, and the first level is a high level, and the second level is a low level), the Data line potential is reset to Vint, the cathode potential of the light emitting diode is VDD, the first transistor T1, the second transistor T2, and the third transistor T3 in the pixel region are turned on, the fourth transistor T4 is turned off, the potential at the N1 point is Vref, and the potential at the N2 point is Vint.
Vth extraction stage: the third driving signal end EM, the sensing signal end Sense, the first driving signal end Scan1, and the second driving signal end Scan2 are at the first level (high potential), the sensing signal end Sen, the Display signal end Display, and the reset signal end RST are at the second level (low potential), the first transistor T1, the second transistor T2, the third transistor T3, and the fourth transistor T4 in the pixel area are all turned on, the potential at the point N1 is Vref, and the potential at the point N2 gradually rises until Vref-Vth.
Because the Data line has more coupling capacitance, the extraction time of Vth is longer, and real-time compensation cannot be performed every frame of picture, so that compensation is performed before the screen is turned on or after the screen is turned off every time, and sufficient time is provided for completing extraction of Vth of each pixel driving TFT.
A sampling stage: the third driving signal terminal EM, the sensing signal terminal Sense, the first driving signal terminal Scan1, the second driving signal terminal Scan2, and the sensing signal terminal Sen are at the first level (high potential), the Display signal terminal Display and the reset signal terminal RST are at the second level (low potential), the Vsen potential is (Vref-Vth), and the sampling is completed.
The difference between the Vref and Vsen potentials is the value of Vth: and writing the obtained Vth value of each pixel into the Data voltage of the corresponding pixel by an algorithm to form a new Data voltage Data ', wherein the Data' is Data-Vth, namely the current magnitude during display is as follows:
thus, the influence of Vth on normal display is eliminated and the threshold voltage Vth of DTFT is compensated for by the above process.
Fig. 3 is a waveform diagram of an anode point potential extraction driving signal of a light emitting diode device in a pixel circuit sensing mode according to an embodiment of the invention. As shown in FIG. 3, the pixel circuit is at the anode point potential VOLEDIn a Sense mode, an anode point potential V to the OLED deviceOLEDCompensation is performed. The three stages are included as follows.
A reset stage: the reset signal end RST, the Display signal end Display, the first driving signal end Scan1 and the second driving signal end Scan2 are at a first level (high potential), the sensing signal end Sen, the sensing signal end Sense and the third driving signal end EM are at low potentials, the potential of the Data line is reset to Vint, the cathode potential of the light emitting diode is VSS, the first transistor T1, the second transistor T2 and the third transistor T3 in the pixel region are turned on, the fourth transistor T4 is turned off, the potential at the point N1 is Vref, and the potential at the point N2 is Vint.
VOLEDThe extraction stage of (2): the third driving signal end EM, the Display signal end Display, and the second driving signal end Scan2 are at the first level (high potential), the first driving signal end Scan1, the sensing signal end Sen, the sensing signal end Sense, and the reset signal end RST are at the low potential, the first transistor T1, the second transistor T2, the third transistor T3, and the fourth transistor T4 in the pixel area are all turned on, the potential at the point N1 is Vref, and the potential at the point N2 gradually rises until stabilization.
Because of more coupling capacitance on the Data line, the anode potential V of the LEDOLEDThe extraction time is long, and real-time compensation cannot be performed on each frame of picture, so that compensation is performed before the screen is opened or after the screen is turned off every time, and sufficient time is provided for completing VOLEDThe extraction of (1).
A sampling stage: the third driving signal terminal EM, the sensing signal terminal Sense, the second driving signal terminal Scan2, and the sensing signal terminal Sen are at the first level (high level), the first driving signal terminal Scan1, the Display signal terminal Display, and the reset signal terminal RST are at the second level (low level), and the Vsen potential is N2 point potential, i.e., the anode point potential VOLEDAnd completing sampling.
The gradual aging of the OLED light-emitting device with the increase of the working time can cause the V obtained by samplingOLEDThe potential changes, and V is obtained twice through an algorithmOLEDConverting the potential difference into corresponding potential, writing the potential into Data voltage to make VOLEDThe potential returns to the original value, thus compensating the brightness uniformity variation of the display frame caused by the aging of the OLED device.
Fig. 4 is a waveform diagram of driving signals in a display mode of a pixel circuit according to an embodiment of the invention. As shown in fig. 4, when the pixel circuit is in the display mode, two stages are included, as follows.
DTFT gate reset phase and Data write phase: the first driving signal terminal Scan1 and the second driving signal terminal Scan2 are at a first level (high potential), the reset signal terminal RST, the Display signal terminal Display, the sensing signal terminal Sen, the sensing signal terminal Sense, and the third driving signal terminal EM are at a second level (low potential), the cathode potential of the light emitting diode is VSS, the first transistor T1, the second transistor T2, and the third transistor T3 in the pixel region are turned on, the fourth transistor T4 is turned off, the potential at the point N1 is Vref, and the potential at the point N2 is Data'.
A light emitting stage: the third driving signal end EM and the Display signal end Display are at the first level (high potential), the first driving signal end Scan1, the second driving signal end Scan2, the sensing signal end Sen, the sensing signal end Sense and the reset signal end RST are at the second level (low potential), the first transistor T1 and the fourth transistor T4 in the pixel region are turned on, and the second transistor T2 and the third transistor T3 are turned off, so that the light emitting diode emits light. In normal display, the screen is in a high frequency driving state, such as 60Hz, which is distinguished from the Sense stage.
Further, according to the compensation circuit of another embodiment of the present invention, as shown in fig. 5, the fourth transistor T4 is removed from the pixel compensation circuit shown in fig. 1, and the drain of the first transistor T1 is directly connected to the first power input terminal VDD.
The compensation of the threshold voltage Vth of DTFT can be accomplished by the compensation circuit shown in fig. 5 as well as the compensation of the luminance change due to the aging of the OLED. Compared with the compensation circuit shown in fig. 1, the compensation principle is the same except that one emission control TFT is removed from the pixel region.
Further, according to the compensation circuit of the further embodiment of the present invention, as shown in fig. 6, on the basis of fig. 1, the gate of the second transistor T2 is connected to the gate of the third transistor T3, and the compensation circuit shown in fig. 6 can complete the compensation of the threshold voltage Vth of the DTFT, but cannot compensate the brightness variation due to the aging of the OLED.
According to the pixel compensation circuit provided by the embodiment of the invention, the first external circuit is connected with the data signal end of the pixel circuit, and the second external circuit is connected with the output end of the pixel circuit. The threshold voltage of the driving transistor is compensated through the potential change of the pixel circuit and an external circuit, the brightness change caused by the aging of the light emitting diode is compensated, the data line and the sensing line are collinear, the circuit number of half of an integrated circuit is reduced, high-resolution display can be realized, the high-resolution display circuit is applied to a display with high pixel density, and the user experience is effectively improved.
An embodiment of the present invention provides a display panel, which includes: the pixel compensation circuit is described above.
According to the display panel provided by the embodiment of the invention, through the pixel compensation circuit, the first external circuit is connected with the data signal end of the pixel circuit, and the second external circuit is connected with the output end of the pixel circuit. The threshold voltage of the driving transistor is compensated through the potential change of the pixel circuit and an external circuit, the brightness change caused by the aging of the light emitting diode is compensated, the data line and the sensing line are collinear, the circuit number of half of an integrated circuit is reduced, high-resolution display can be realized, the high-resolution display circuit is applied to a display with high pixel density, and the user experience is effectively improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A pixel compensation circuit, comprising:
a pixel circuit and an external circuit for maintaining the brightness of the display screen uniform by compensation;
the external circuit includes a first external circuit and a second external circuit; the first external circuit is connected with a data signal end of the pixel circuit, and the second external circuit is connected with an output end of the pixel circuit.
2. The pixel compensation circuit of claim 1, wherein the pixel circuit comprises: the light-emitting diode comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a capacitor and a light-emitting diode;
the grid electrode of the first transistor is connected with the first end of the capacitor and the drain electrode of the second transistor, the source electrode of the first transistor is connected with the second end of the capacitor and the anode of the light-emitting diode, and the drain electrode of the first transistor is connected with the source electrode of the fourth transistor;
the grid electrode of the second transistor is connected with the first driving signal end, the source electrode of the second transistor is connected with the reference voltage, and the drain electrode of the second transistor is connected with the first end of the capacitor;
the grid electrode of the third transistor is connected with a second driving signal end, the source electrode of the third transistor is connected with the data signal end, and the drain electrode of the third transistor is connected with the second end of the capacitor, the anode of the light-emitting diode and the source electrode of the first transistor;
the grid electrode of the fourth transistor is connected with the third driving signal end, and the drain electrode of the fourth transistor is connected with the first power supply input end;
and the anode of the light emitting diode is connected with the second end of the capacitor, and the cathode of the light emitting diode is the output end of the pixel circuit.
3. The pixel compensation circuit of claim 2, wherein the first external circuit comprises: a fifth transistor and a sixth transistor;
the grid electrode of the fifth transistor is connected with a sensing signal end, and the drain electrode and the source electrode are respectively connected with a second power supply input end and the data signal end and are used for resetting the data signal end;
the grid electrode of the sixth transistor is connected with a reset signal end, and the drain electrode and the source electrode are respectively connected with a third power input end and the data signal end and are used for carrying out sensing sampling on the data signal end;
the second external circuit includes: a seventh transistor and an eighth transistor;
the grid electrode of the seventh transistor is connected with the induction signal end, and the drain electrode and the source electrode are respectively connected with the fourth power input end and the cathode of the light-emitting diode and used for switching the potential of the cathode of the light-emitting diode to a high potential;
and the grid electrode of the eighth transistor is connected with the display signal end, and the drain electrode and the source electrode are respectively connected with the fifth power input end and the cathode of the light-emitting diode and are used for switching the potential of the cathode of the light-emitting diode to a low potential.
4. The pixel compensation circuit according to claim 3, wherein the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, and the eighth transistor are each an N-channel transistor.
5. The pixel compensation circuit according to claim 3, wherein in a reset phase for compensating for the threshold voltage of the first transistor, the first driving signal terminal, the second driving signal terminal, the reset signal terminal and the sensing signal terminal are at a first level, the third driving signal terminal, the sensing signal terminal and the display signal terminal are at a second level, and the first level and the second level are opposite;
an extraction stage for compensating the threshold voltage of the first transistor, wherein the first driving signal terminal, the second driving signal terminal, the third driving signal terminal and the sensing signal terminal are at the first level, and the sensing signal terminal, the reset signal terminal and the display signal terminal are at the second level;
and in a sampling stage of compensating the threshold voltage of the first transistor, the second driving signal end, the third driving signal end, the sensing signal end and the sensing signal end are at a first level, and the first driving signal end, the reset signal end and the display signal end are at a second level.
6. The pixel compensation circuit of claim 3,
in a reset stage of compensating the anode point potential of the light emitting diode, the first driving signal terminal, the second driving signal terminal, the reset signal terminal and the display signal terminal are at a first level, the third driving signal terminal, the sensing signal terminal and the sensing signal terminal are at a second level, and the first level is opposite to the second level;
an extraction stage for compensating the anode point potential of the light emitting diode, wherein the second driving signal end, the third driving signal end and the display signal end are at the first level, and the first driving signal end, the sensing signal end, the reset signal end and the sensing signal end are at the second level;
and in a sampling stage for compensating the anode point potential of the light emitting diode, the second driving signal end, the third driving signal end, the sensing signal end and the sensing signal end are in a first level, and the first driving signal end, the reset signal end and the display signal end are in a second level.
7. The pixel compensation circuit of claim 3,
the pixel circuit is in a display mode, in a gate reset stage and a data write stage of the first transistor, the first driving signal terminal and the second driving signal terminal are at a first level, the third driving signal terminal, the sensing signal terminal, the reset signal terminal, the sensing signal terminal and the display signal terminal are at a second level, and the first level is opposite to the second level;
in the light emitting stage of the light emitting diode, the third driving signal end and the display signal end are at the first level, and the first driving signal end, the second driving signal end, the sensing signal end, the reset signal end and the sensing signal end are at the second level.
8. The pixel compensation circuit of claim 3,
and removing the fourth transistor, wherein the drain electrode of the first transistor is connected with the first power supply input end.
9. The pixel compensation circuit of claim 3,
connecting the transistor gate with the third transistor gate.
10. A display panel, comprising: a pixel compensation circuit according to any one of claims 1-9.
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| CN202010219884.5A CN111261114A (en) | 2020-03-25 | 2020-03-25 | Display panel and pixel compensation circuit |
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