CN113421524A - Voltage supply unit, voltage supply method and display device - Google Patents
Voltage supply unit, voltage supply method and display device Download PDFInfo
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- CN113421524A CN113421524A CN202110677942.3A CN202110677942A CN113421524A CN 113421524 A CN113421524 A CN 113421524A CN 202110677942 A CN202110677942 A CN 202110677942A CN 113421524 A CN113421524 A CN 113421524A
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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]
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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
Abstract
The invention provides a voltage providing unit, a voltage providing method and a display device. The voltage supply unit comprises a detection circuit and a voltage supply circuit; the detection circuit is used for detecting the display brightness range of the display panel and sending a first control signal to the voltage supply circuit when the display brightness range is detected to be in a preset brightness range; the voltage supply circuit is used for controlling the voltage value of the first reset voltage to be larger than the voltage value of the first voltage signal when receiving the first control signal, and the difference value between the voltage value of the first reset voltage and the voltage value of the first voltage signal is within a preset voltage difference value range. The invention solves the problem that the AMOLED (active matrix organic light emitting diode) display device can generate poor display due to insufficient charging time in a high refresh frequency and low display brightness range.
Description
Technical Field
The present invention relates to the field of voltage providing technologies, and in particular, to a voltage providing unit, a voltage providing method, and a display device.
Background
An AMOLED (active matrix organic light emitting diode) display device may operate at a plurality of refresh frequencies, for example, 60Hz, 90Hz and 120 Hz. When the refresh frequency of the AMOLED display device is 120Hz, and the display panel operates in a low display brightness range, a poor display phenomenon may occur due to insufficient charging time when displaying a predetermined screen.
Disclosure of Invention
The invention mainly aims to provide a voltage providing unit, a voltage providing method and a display device, which solve the problem that the AMOLED display device has poor display due to insufficient charging time in a high refresh frequency and low display brightness range.
The embodiment of the invention provides a voltage providing unit, which is applied to a display panel, wherein the display panel comprises a pixel circuit, a first reset circuit and a second reset circuit, wherein the pixel circuit comprises a light-emitting element and the first reset circuit; the first reset circuit is used for supplying a first reset voltage to a first pole of the light-emitting element under the control of a first scanning signal supplied by a first scanning line; the second pole of the light-emitting element is connected with a first voltage signal; the voltage supply unit comprises a detection circuit and a voltage supply circuit;
the detection circuit is used for detecting the display brightness range of the display panel and sending a first control signal to the voltage supply circuit when the display brightness range is detected to be in a preset brightness range;
the voltage supply circuit is used for controlling the voltage value of the first reset voltage to be larger than the voltage value of the first voltage signal when the first control signal is received, and the difference value between the voltage value of the first reset voltage and the voltage value of the first voltage signal is within a preset voltage difference value range.
Optionally, the predetermined voltage difference range is greater than or equal to 0.2V and less than or equal to 0.6V.
Optionally, the predetermined brightness range is less than or equal to 2 nit.
Optionally, the detection circuit is further configured to provide a second control signal to the voltage providing circuit when detecting that the display luminance range of the display panel is not within the predetermined luminance range;
the voltage supply circuit is used for controlling the voltage value of the first reset voltage to follow the voltage value change of the first voltage signal when the second control signal is received, so that the voltage value of the first reset voltage is equal to or approximately equal to the voltage value of the first voltage signal.
The embodiment of the invention also provides a voltage supply method, which is applied to a display panel, wherein the display panel comprises a pixel circuit, and the pixel circuit comprises a light-emitting element and a first reset circuit; the first reset circuit is used for supplying a first reset voltage to a first pole of the light-emitting element under the control of a first scanning signal supplied by a first scanning line; the second pole of the light-emitting element is connected with a first voltage signal; the voltage supply method comprises the following steps:
when the display brightness range of the display panel is detected to be within a preset brightness range, the voltage value of the first reset voltage is controlled to be larger than the voltage value of the first voltage signal, and the difference value between the voltage value of the first reset voltage and the voltage value of the first voltage signal is controlled to be within a preset voltage difference value range.
Optionally, the predetermined voltage difference range is greater than or equal to 0.2V and less than or equal to 0.6V.
Optionally, the predetermined brightness range is less than or equal to 2 nit.
Optionally, the voltage providing method according to the embodiment of the present invention further includes: when the display brightness range of the display panel is detected not to be within the preset brightness range, the voltage value of the first reset voltage is controlled to follow the voltage value change of the first voltage signal, so that the voltage value of the first reset voltage is equal to or approximately equal to the voltage value of the first voltage signal.
The embodiment of the invention also provides a display device, which comprises a display panel and the voltage supply unit; the display panel includes a pixel circuit; the pixel circuit includes a light emitting element and a first reset circuit;
the first reset circuit is electrically connected to a first scan line and a first pole of the light emitting element, respectively, and configured to supply a first reset voltage to the first pole of the light emitting element under control of a first scan signal supplied from the first scan line;
the second pole of the light emitting element is connected to the first voltage signal.
Optionally, the pixel circuit further includes a driving circuit and a second reset circuit;
the second reset circuit is respectively electrically connected with the reset wire and the control end of the drive circuit and is used for writing a second reset voltage into the control end of the drive circuit under the control of a reset signal provided by the reset wire;
the drive circuit is used for generating a drive current under the control of the potential of the control end of the drive circuit.
Optionally, the first reset circuit includes a first transistor;
a control electrode of the first transistor is electrically connected to the first scan line, a first electrode of the first transistor is connected to a first reset voltage, and a second electrode of the first transistor is electrically connected to a first electrode of the light emitting element.
The voltage providing unit, the voltage providing method and the display device improve the phenomenon of poor display caused by insufficient charging time and enhance the image display effect.
Drawings
Fig. 1 is a structural diagram of a voltage supply unit according to an embodiment of the present invention;
FIG. 2 is a block diagram of an embodiment of a pixel circuit in a display device according to an embodiment of the invention;
FIG. 3 is a circuit diagram of at least one embodiment of the pixel circuit;
fig. 4 is a timing diagram illustrating operation of at least one embodiment of the pixel circuit shown in fig. 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The transistors used in all embodiments of the present invention may be transistors, thin film transistors, or field effect transistors or other devices with the same characteristics. In the embodiment of the present invention, in order to distinguish two poles of the transistor except the control pole, one pole is called a first pole, and the other pole is called a second pole.
In practical operation, when the transistor is a triode, the control electrode may be a base electrode, the first electrode may be a collector electrode, and the second electrode may be an emitter electrode; alternatively, the control electrode may be a base electrode, the first electrode may be an emitter electrode, and the second electrode may be a collector electrode.
In practical operation, when the transistor is a thin film transistor or a field effect transistor, the control electrode may be a gate electrode, the first electrode may be a drain electrode, and the second electrode may be a source electrode; alternatively, the control electrode may be a gate electrode, the first electrode may be a source electrode, and the second electrode may be a drain electrode.
The voltage providing unit according to the embodiment of the present invention is applied to a display panel, and the display panel includes a pixel circuit, as shown in fig. 1, the pixel circuit includes a light emitting element 10 and a first reset circuit 11; the first reset circuit 11 is electrically connected to the first scan line G1 and the first pole of the light emitting device 10, respectively, and is configured to supply a first reset voltage Vi1 to the first pole of the light emitting device 10 under the control of a first scan signal supplied from the first scan line G1; a second pole of the light emitting element 10 is connected to a first voltage signal V1; the voltage supply unit includes a detection circuit 21 and a voltage supply circuit 22;
the detection circuit 21 is configured to detect a display luminance range of the display panel, and send a first control signal to the voltage providing circuit 22 when the display luminance range is detected to be within a predetermined luminance range;
the voltage providing circuit 22 is electrically connected to the detecting circuit 21, and is configured to control the voltage value of the first reset voltage Vi1 to be greater than the voltage value of the first voltage signal V1 and the difference between the voltage value of the first reset voltage Vi1 and the voltage value of the first voltage signal V1 to be within a predetermined voltage difference range when receiving the first control signal.
In the embodiment of the present invention, the voltage providing circuit 22 may be configured to provide the first reset voltage Vi1 and the first voltage signal V1.
In the related art, when the display panel operates in a low display luminance range (i.e., when the display panel operates in a predetermined luminance range), color blocks may occur due to insufficient charging time when a predetermined screen is displayed at a high refresh frequency. Based on this, in the embodiment of the present invention, when the display luminance range of the display panel is within the predetermined luminance range, the voltage value of the first reset voltage is controlled to be greater than the voltage value of the first voltage signal, so that the potential of the first pole of the light emitting element is greater than the potential of the second pole of the light emitting element, so that in the charging stage, the first pole of the light emitting element retains a certain charge, the luminance of the light emitting element is temporarily increased when the light emitting stage comes, a phenomenon of poor display (the poor display may be a color block, for example) caused by insufficient charging time is improved, an image display effect is enhanced, the reliability of a display product is improved, and the production cost is reduced.
Optionally, the predetermined voltage difference range is greater than or equal to 0.2V and less than or equal to 0.6V.
Optionally, the predetermined brightness range is less than or equal to 2 nit.
In practical implementation, the detection circuit 21 is further configured to provide a second control signal to the voltage providing circuit 22 when detecting that the display brightness range of the display panel is not within the predetermined brightness range;
the voltage providing circuit 22 is configured to control the voltage value of the first reset voltage to follow the voltage value change of the first voltage signal when receiving the second control signal, so that the voltage value of the first reset voltage is equal to or substantially equal to the voltage value of the first voltage signal, i.e. the potential of the first pole of the light emitting element is equal to or substantially equal to the potential of the second pole of the light emitting element.
Optionally, the controlling that the voltage value of the first reset voltage is substantially equal to the voltage value of the first voltage signal may be: controlling an absolute value of a difference between a voltage value of a first reset voltage and a voltage value of the first voltage signal to be less than a voltage difference threshold. The voltage difference threshold may be, for example, 0.01V, but is not limited thereto.
The voltage providing method is applied to a display panel, the display panel comprises a pixel circuit, and the pixel circuit comprises a light-emitting element and a first reset circuit; the first reset circuit is used for supplying a first reset voltage to a first pole of the light-emitting element under the control of a first scanning signal supplied by a first scanning line; the second pole of the light-emitting element is connected with a first voltage signal; the voltage supply method comprises the following steps:
when the display brightness range of the display panel is detected to be within a preset brightness range, the voltage value of the first reset voltage is controlled to be larger than the voltage value of the first voltage signal, and the difference value between the voltage value of the first reset voltage and the voltage value of the first voltage signal is controlled to be within a preset voltage difference value range, so that the phenomenon of color blocks caused by insufficient charging time in a low display brightness range and a high refreshing frequency is improved, and the image display effect is enhanced.
Optionally, the predetermined voltage difference range is greater than or equal to 0.2V and less than or equal to 0.6V, but not limited thereto.
In practical implementation, when the voltage difference between the voltage value of the first reset voltage and the voltage value of the first voltage signal is between 0.2V and 0.6V, the display effect is improved. When the pressure difference is 0.5V, the display effect is optimal. When the voltage difference is too large, an influence is exerted on a Gamma voltage, and thus it is not recommended to set the voltage difference to be too large.
Alternatively, the predetermined brightness range may be less than or equal to 2nit, but is not limited thereto.
The display brightness range of the display panel refers to: the display brightness of the display panel is greater than or equal to a first preset brightness and less than or equal to a second preset brightness;
the second predetermined brightness may refer to: the maximum brightness that the display panel can display;
the first predetermined brightness may refer to: the display panel is capable of displaying a minimum brightness.
For example, the display luminance range of the display panel is within a predetermined luminance range, which means that the display luminance range of the display panel is within the predetermined luminance range when the display panel displays a predetermined screen, but means that: when the display panel displays any picture, the display brightness range of the display panel is within a preset brightness range.
In specific implementation, the voltage providing method according to the embodiment of the present invention may further include: when detecting that the display brightness range of the display panel is not within the preset brightness range, controlling the voltage value of the first reset voltage to follow the voltage value change of the first voltage signal so that the voltage value of the first reset voltage is equal to or approximately equal to the voltage value of the first voltage signal, namely, the potential of the first pole of the light-emitting element is equal to or approximately equal to the potential of the second pole of the light-emitting element.
The display device of the embodiment of the invention comprises a display panel and the voltage supply unit; the display panel includes a pixel circuit; the pixel circuit includes a light emitting element and a first reset circuit;
the first reset circuit is electrically connected to a first scan line and a first pole of the light emitting element, respectively, and configured to supply a first reset voltage to the first pole of the light emitting element under control of a first scan signal supplied from the first scan line;
the second pole of the light emitting element is connected to the first voltage signal.
The display device according to the embodiment of the invention may include the voltage providing unit and the display panel, and the voltage providing unit may control a voltage value of the first reset voltage and a voltage value of the first voltage signal according to a display luminance range of the display panel.
For a display panel that can operate at multiple refresh rates, at low brightness, when the display panel operates at a high refresh rate, an external compensation is required for the superposition of errors due to the short charging time, and the binding Spec (Specification Range) error, the optical probe measurement error, and the DIC (drive Integrated Circuit) accuracy error. Based on this, the implementation of the present invention can control the voltage value of the first reset voltage and the voltage value of the first voltage signal accordingly.
In particular, at least one embodiment of the pixel circuit may further include a driving circuit and a second reset circuit;
the second reset circuit is respectively electrically connected with the reset wire and the control end of the drive circuit and is used for writing a second reset voltage into the control end of the drive circuit under the control of a reset signal provided by the reset wire;
the drive circuit is used for generating a drive current under the control of the potential of the control end of the drive circuit.
In at least one embodiment of the invention, two reset voltages are respectively used for setting the first electrode of the light emitting element and the control end of the driving circuit.
The display device according to the embodiment of the present invention may be an AMOLED (active matrix organic light emitting diode) display device, a quantum dot display device, or the like.
In at least one embodiment of the present invention, the pixel circuit may further include a driving circuit, a data writing circuit, a second reset circuit, a compensation control circuit, a light emission control circuit, and a tank circuit;
the data writing circuit is respectively electrically connected with the second scanning line, the data line and the first end of the driving circuit and is used for writing the data voltage on the data line into the first end of the driving circuit under the control of a second scanning signal provided by the second scanning line;
the compensation control circuit is respectively electrically connected with a third scanning line, the control end of the driving circuit and the second end of the driving circuit and is used for controlling the communication between the control end of the driving circuit and the second end of the driving circuit under the control of a third scanning signal provided by the third scanning line;
the light-emitting control circuit is respectively electrically connected with a light-emitting control line, a first end of the driving circuit, a second end of the driving circuit and a first pole of the light-emitting element, the light-emitting control circuit is connected with a second voltage signal, and the light-emitting control circuit is used for controlling the first end of the driving circuit to be connected with the second voltage signal under the control of the light-emitting control signal provided by the light-emitting control line and controlling the connection between the second end of the driving circuit and the first pole of the light-emitting element;
the energy storage circuit is electrically connected with the control end of the driving circuit and used for storing electric energy.
As shown in fig. 2, at least one embodiment of the pixel circuit may include a light emitting element 10, a first reset circuit 11, a driving circuit 30, a data writing circuit 31, a second reset circuit 32, a compensation control circuit 33, a light emission control circuit 34, and a tank circuit 35;
the first reset circuit 11 is electrically connected to the first scan line G1 and a first pole of the light emitting device 10, respectively, the first reset circuit 11 is connected to a first reset voltage Vi1, and the first reset circuit 11 is configured to provide a first reset voltage Vi1 to the first pole of the light emitting device 10 under the control of a first scan signal provided by the first scan line G1;
a second pole of the light emitting element 10 is connected to a first voltage signal V1;
the data writing circuit 31 is electrically connected to the second scan line G2, the data line D0 and the first end of the driving circuit 30, respectively, and is configured to write the data voltage on the data line D0 into the first end of the driving circuit 30 under the control of the second scan signal provided by G2;
the second reset circuit 32 is electrically connected to the reset line RST and the control terminal of the driving circuit 30, the second reset circuit 32 is connected to a second reset voltage Vi2, and the second reset circuit 32 is configured to write a second reset voltage Vi2 into the control terminal of the driving circuit 30 under the control of a reset signal provided by the reset line RST;
the compensation control circuit 33 is electrically connected to the third scan line G3, the control terminal of the driving circuit 30 and the second terminal of the driving circuit 30, respectively, for controlling the communication between the control terminal of the driving circuit 30 and the second terminal of the driving circuit 30 under the control of the third scan signal provided by G3;
the light-emitting control circuit 34 is electrically connected to a light-emitting control line EM, a first terminal of the driving circuit 30, a second terminal of the driving circuit 30, and a first pole of the light-emitting element 10, respectively, the light-emitting control circuit 34 is connected to a second voltage signal V2, the light-emitting control circuit 34 is configured to control the first terminal of the driving circuit 30 to be connected to the second voltage signal V2 and control the second terminal of the driving circuit to be connected to the first pole of the light-emitting element 10 under the control of a light-emitting control signal provided by the light-emitting control line EM;
the energy storage circuit 35 is electrically connected to the control end of the driving circuit 30 and is configured to store electric energy;
the driving circuit 30 is used for generating a driving current under the control of the potential of the control terminal thereof.
In the embodiment of the present invention as shown in fig. 2, two reset voltages are adopted, the first reset voltage Vi1 is used for resetting the electric potential of the first pole of the light emitting element 10, the second reset voltage Vi2 is used for resetting the electric potential of the control terminal of the driving circuit 30, the driving circuit 30 comprises a driving transistor which can be a p-type transistor, Vi2 is a constant negative voltage, so that the driving transistor can be turned on at the beginning of the charging phase; vi1 may vary as the first voltage signal varies.
In at least one embodiment of the present invention, the first voltage signal may be a low voltage signal, and the second voltage signal may be a high voltage signal.
When the embodiment of the pixel circuit shown in fig. 2 of the present invention is in operation, the display period may include a reset phase, a charging phase and a light-emitting phase, which are sequentially set;
in the reset phase, the second reset circuit 32 writes the second reset voltage Vi2 into the control terminal of the driving circuit 30 under the control of the reset signal provided by the reset line RST, so that the driving circuit 30 can conduct the connection between the first terminal and the second terminal thereof at the beginning of the charging phase;
in the charging phase, the first reset circuit 11 supplies a first reset voltage Vi1 to the first pole of the light emitting element 10 under the control of a first scan signal supplied from the first scan line G1; the data writing circuit 31 writes the data voltage on the data line D0 into the first terminal of the driving circuit 30 under the control of the second scan signal supplied from G2; the compensation control circuit 33 controls the communication between the control end of the driving circuit 30 and the second end of the driving circuit 30 under the control of the third scanning signal;
at the beginning of the charging phase, the driving circuit 30 controls the connection between the first end and the second end thereof under the control of the potential of the control end thereof, and the data voltage Vd on the data line charges the energy storage circuit 35 to raise the potential of the control end of the driving circuit 30 until the driving circuit 30 disconnects the connection between the first end and the second end thereof;
in the light emitting stage, the light emitting control circuit 34 controls the first end of the driving circuit 30 to access the second voltage signal V2 under the control of the light emitting control signal provided by the light emitting control line EM, controls the second end of the driving circuit to communicate with the first pole of the light emitting element 10, and drives the light emitting element 10 to emit light by the driving circuit 30.
Optionally, the first reset circuit includes a first transistor;
a control electrode of the first transistor is electrically connected to the first scan line, a first electrode of the first transistor is connected to a first reset voltage, and a second electrode of the first transistor is electrically connected to a first electrode of the light emitting element.
Optionally, the driving circuit includes a driving transistor, the data writing circuit includes a second transistor, the second reset circuit includes a third transistor, the compensation control circuit includes a fourth transistor, the light emission control circuit includes a fifth transistor and a sixth transistor, and the energy storage circuit includes a storage capacitor;
a control electrode of the driving transistor is electrically connected with a second electrode of the third transistor, a first electrode of the fourth transistor and a first end of the storage capacitor respectively, a first electrode of the driving transistor is electrically connected with a second electrode of the second transistor and a second electrode of the fifth transistor respectively, and a second electrode of the driving transistor is electrically connected with a second electrode of the fourth transistor and a first electrode of the sixth transistor respectively;
a control electrode of the second transistor is electrically connected with the second scanning line, a first electrode of the second transistor is electrically connected with the data line, and a second electrode of the second transistor is electrically connected with the first electrode of the driving transistor;
a control electrode of the third transistor is electrically connected with the reset wire, a first electrode of the third transistor is connected with a second reset voltage, and a second electrode of the third transistor is electrically connected with the control electrode of the driving transistor;
a control electrode of the fourth transistor is electrically connected to the three scan lines, a first electrode of the fourth transistor is electrically connected to the control electrode of the driving transistor, and a second electrode of the fourth transistor is electrically connected to the second electrode of the driving transistor;
a control electrode of the fifth transistor is electrically connected with the light-emitting control line, a first electrode of the fifth transistor is connected with a second voltage signal, and a second electrode of the fifth transistor is electrically connected with the first electrode of the driving transistor;
a control electrode of the sixth transistor is electrically connected to the light-emission control line, a first electrode of the sixth transistor is electrically connected to the second electrode of the driving transistor, and the second electrode of the sixth transistor is electrically connected to the first electrode of the light-emitting element;
the first end of the storage capacitor is electrically connected with the control electrode of the driving transistor, and the second end of the storage capacitor is connected with a second voltage signal.
In at least one embodiment of the present invention, the first scan line, the second scan line and the third scan line may be the same scan line, but not limited thereto.
As shown in fig. 3, on the basis of at least one embodiment of the pixel circuit shown in fig. 2, the light emitting element is an organic light emitting diode O1;
the first reset circuit 11 includes a first transistor T1;
the gate of the first transistor T1 is electrically connected to the first scan line G1, the source of the first transistor T1 is connected to a first reset voltage Vi1, and the drain of the first transistor T1 is electrically connected to the anode of O1;
the driving circuit 30 includes a driving transistor T0, the data writing circuit 31 includes a second transistor T2, the second reset circuit 32 includes a third transistor T3, the compensation control circuit 33 includes a fourth transistor T4, the light emission control circuit 34 includes a fifth transistor T5 and a sixth transistor T6, and the energy storage circuit 35 includes a storage capacitor C;
a gate of the driving transistor T0 is electrically connected to a drain of a third transistor T3, a source of a fourth transistor T4, and a first end of a storage capacitor C, respectively, a source of the driving transistor T0 is electrically connected to a drain of the second transistor T2 and a drain of the fifth transistor T5, respectively, and a drain of the driving transistor T0 is electrically connected to a drain of the fourth transistor T4 and a source of the sixth transistor T6, respectively;
a gate of the second transistor T2 is electrically connected to a first scan line G1, a source of the second transistor T2 is electrically connected to the data line D0, and a drain of the second transistor T2 is electrically connected to a source of the driving transistor T0;
the gate of the third transistor T3 is electrically connected to the reset wire RST, the source of the third transistor T3 is connected to a second reset voltage Vi2, and the drain of the third transistor T3 is electrically connected to the gate of the driving transistor T0;
a gate of the fourth transistor T4 is electrically connected to the first scan line G1, a source of the fourth transistor T4 is electrically connected to the gate of the driving transistor T0, and a drain of the fourth transistor T4 is electrically connected to the drain of the driving transistor T0;
a gate of the fifth transistor T5 is electrically connected to the emission control line EM, a source of the fifth transistor T5 is connected to a high voltage signal VDD, and a drain of the fifth transistor T5 is electrically connected to a source of the driving transistor T0;
a gate electrode of the sixth transistor T6 is electrically connected to the emission control line EM, a source electrode of the sixth transistor T6 is electrically connected to the drain electrode of the driving transistor T0, and a drain electrode of the sixth transistor T6 is electrically connected to an anode electrode of the organic light emitting diode O1; the cathode of the O1 is connected with a low voltage signal VSS;
a first end of the storage capacitor C is electrically connected to the gate of the driving transistor T0, and a second end of the storage capacitor C is connected to a high voltage signal VDD.
In at least one embodiment shown in fig. 3, all of the transistors may be p-type transistors, but not limited thereto.
In at least one embodiment shown in fig. 3, the first scan line G1, the second scan line G and the third scan line G are the same scan line, but not limited thereto.
In at least one embodiment shown in fig. 3, the first voltage signal is a low voltage signal VSS, and the second voltage signal is a high voltage signal VDD, but not limited thereto.
As shown in fig. 4, the display period includes a reset phase t1, a charging phase t2, and a light emitting phase t3, which are sequentially set;
in the reset phase T1, the EM provides a high voltage signal, the RST provides a low voltage signal, the G1 provides a high voltage signal, the T3 is turned on, and the second reset voltage Vi2 is provided to the gate of the T0; the second reset voltage Vi2 is a negative voltage;
in the charging phase T2, the EM provides a high voltage signal, the RST provides a high voltage signal, the G1 provides a low voltage signal, the T1, the T2 and the T4 are turned on, the first reset voltage Vi1 is provided to the anode of the O1, and the data voltage Vd on the D0 is written to the source of the T0;
at the beginning of the charging phase T2, T0 is turned on, Vd charges for C through T2, T0 and T4 to raise the potential of the gate of T0 until the potential of the gate of T0 becomes Vd + Vth, Vth is the threshold voltage of T0, T0 is turned off, and charging is stopped;
in the lighting period T3, the EM provides a low voltage signal, the RST provides a high voltage signal, the G1 provides a high voltage signal, the T5 and the T6 are turned on, and the T0 drives the O1 to light.
In the operation of at least one embodiment of the pixel circuit shown in fig. 3 of the present invention, when the display luminance of the display panel included in the pixel circuit is within a predetermined luminance range (the predetermined luminance range may be, for example, less than or equal to 2nit), the circuit provides a circuit to control the voltage value of Vi1 to be greater than the voltage value of VSS, and control the difference between the voltage value of Vi1 and the voltage value of VSS to be within a predetermined voltage difference range (the predetermined voltage difference range may be, for example, greater than or equal to 0.2V and less than or equal to 0.6V), so that the potential of the anode of the organic light emitting diode O1 is greater than the potential of the cathode of the organic light emitting diode O1, so that the anode of the organic light emitting diode O1 retains a certain charge during the charging period t2, the luminance of the organic light emitting diode O1 is temporarily raised after the light emitting period t3, the phenomenon of poor display due to insufficient charging time (the poor display may be, for example, color lump), enhancing the image display effect;
when the display brightness of the display panel included in the pixel circuit is not within the preset brightness range, the voltage supply circuit controls the voltage value of Vi1 to follow the voltage value of VSS so that the voltage value of Vi1 is equal to or approximately equal to the voltage value of VSS, the potential of the anode of the organic light emitting diode O1 is equal to or approximately equal to the potential of the cathode of the organic light emitting diode O1, and residual charges on the anode of the organic light emitting diode O1 are removed.
The display device provided by the embodiment of the invention can be any product or component with a display function, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (11)
1. A voltage supply unit is applied to a display panel, and the display panel comprises a pixel circuit, wherein the pixel circuit comprises a light-emitting element and a first reset circuit; the first reset circuit is used for supplying a first reset voltage to a first pole of the light-emitting element under the control of a first scanning signal supplied by a first scanning line; the second pole of the light-emitting element is connected with a first voltage signal; the voltage supply unit comprises a detection circuit and a voltage supply circuit;
the detection circuit is used for detecting the display brightness range of the display panel and sending a first control signal to the voltage supply circuit when the display brightness range is detected to be in a preset brightness range;
the voltage supply circuit is used for controlling the voltage value of the first reset voltage to be larger than the voltage value of the first voltage signal when the first control signal is received, and the difference value between the voltage value of the first reset voltage and the voltage value of the first voltage signal is within a preset voltage difference value range.
2. The voltage providing unit of claim 1, wherein the predetermined voltage difference range is greater than or equal to 0.2V and less than or equal to 0.6V.
3. The voltage supply unit of claim 1, wherein the predetermined luminance range is less than or equal to 2 nit.
4. The voltage supply unit according to any one of claims 1 to 3, wherein the detection circuit is further configured to supply a second control signal to the voltage supply circuit when detecting that the display luminance range of the display panel is not within the predetermined luminance range;
the voltage supply circuit is used for controlling the voltage value of the first reset voltage to follow the voltage value change of the first voltage signal when the second control signal is received, so that the voltage value of the first reset voltage is equal to or approximately equal to the voltage value of the first voltage signal.
5. A voltage supply method is applied to a display panel which comprises a pixel circuit, and is characterized in that the pixel circuit comprises a light-emitting element and a first reset circuit; the first reset circuit is used for supplying a first reset voltage to a first pole of the light-emitting element under the control of a first scanning signal supplied by a first scanning line; the second pole of the light-emitting element is connected with a first voltage signal; the voltage supply method comprises the following steps:
when the display brightness range of the display panel is detected to be within a preset brightness range, the voltage value of the first reset voltage is controlled to be larger than the voltage value of the first voltage signal, and the difference value between the voltage value of the first reset voltage and the voltage value of the first voltage signal is controlled to be within a preset voltage difference value range.
6. The voltage supplying method according to claim 5, wherein the predetermined voltage difference range is greater than or equal to 0.2V and less than or equal to 0.6V.
7. The voltage supplying method according to claim 5, wherein the predetermined luminance range is less than or equal to 2 nit.
8. The voltage supply method according to any one of claims 5 to 7, further comprising: when the display brightness range of the display panel is detected not to be within the preset brightness range, the voltage value of the first reset voltage is controlled to follow the voltage value change of the first voltage signal, so that the voltage value of the first reset voltage is equal to or approximately equal to the voltage value of the first voltage signal.
9. A display device comprising a display panel and the voltage supply unit according to any one of claims 1 to 4; the display panel includes a pixel circuit; the pixel circuit includes a light emitting element and a first reset circuit;
the first reset circuit is electrically connected to a first scan line and a first pole of the light emitting element, respectively, and configured to supply a first reset voltage to the first pole of the light emitting element under control of a first scan signal supplied from the first scan line;
the second pole of the light emitting element is connected to the first voltage signal.
10. The display device according to claim 9, wherein the pixel circuit further comprises a driver circuit and a second reset circuit;
the second reset circuit is respectively electrically connected with the reset wire and the control end of the drive circuit and is used for writing a second reset voltage into the control end of the drive circuit under the control of a reset signal provided by the reset wire;
the drive circuit is used for generating a drive current under the control of the potential of the control end of the drive circuit.
11. The display device according to claim 9 or 10, wherein the first reset circuit includes a first transistor;
a control electrode of the first transistor is electrically connected to the first scan line, a first electrode of the first transistor is connected to a first reset voltage, and a second electrode of the first transistor is electrically connected to a first electrode of the light emitting element.
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| CN113421524B (en) | 2023-07-14 |
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