CN111653241A - Voltage supply method, voltage supply device, display device, and electronic apparatus - Google Patents
Voltage supply method, voltage supply device, display device, and electronic apparatus Download PDFInfo
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- CN111653241A CN111653241A CN202010730814.6A CN202010730814A CN111653241A CN 111653241 A CN111653241 A CN 111653241A CN 202010730814 A CN202010730814 A CN 202010730814A CN 111653241 A CN111653241 A CN 111653241A
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 6
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- 238000010586 diagram Methods 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 4
- 230000005669 field effect Effects 0.000 description 2
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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
- 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
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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- Engineering & Computer Science (AREA)
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a voltage supply method, a voltage supply device, a display device and an electronic apparatus. The voltage supply method is applied to a pixel circuit, the pixel circuit comprises a driving unit, a first end of the driving unit is electrically connected with a driving voltage end, and a second end of the driving unit is electrically connected with a light-emitting element; the voltage supply method comprises the following steps: dividing one frame of picture display time into N display time periods; n is an integer greater than 1; providing an nth driving voltage to the driving voltage terminal in an nth display period; the nth display period corresponds to the nth driving voltage; n is a positive integer less than or equal to N; the driving voltages corresponding to the at least two display periods are different from each other. The invention can accurately adjust the brightness of the light emitting element.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a voltage providing method, a voltage providing apparatus, a display device, and an electronic device.
Background
The image quality of the display depends on the accuracy of the control of the light emission luminance of the pixel circuit. The control of the luminance of the pixel circuit can be realized by adjusting the data voltage and the driving voltage, and further adjusting the current flowing through the light-emitting element. The luminance of the light emitting element and the current flowing through the light emitting element have a linear relationship, and in order to accurately control the luminance of the pixel circuit, it is necessary to accurately control the current flowing through the light emitting element. In the power-exponential relationship between the current flowing through the light-emitting element and the driving voltage, a small change in the driving voltage results in a large change in the current flowing through the light-emitting element. The minimum step size of the drive voltage applied to the pixel circuit is only accurate to 10mV due to the noise present in the circuit, and therefore, there is a difficulty in accurately controlling the current flowing through the light emitting element, resulting in an inability to accurately adjust the luminance of the pixel circuit.
Disclosure of Invention
The present invention is directed to a voltage providing method, a voltage providing apparatus, a display device, and an electronic device, which solve the problem in the prior art that the brightness of light emitting elements cannot be accurately adjusted.
In order to achieve the above object, the present invention provides a voltage providing method applied to a pixel circuit, the pixel circuit including a driving unit, a first end of the driving unit being electrically connected to a driving voltage terminal, and a second end of the driving unit being electrically connected to a light emitting element; the voltage supply method comprises the following steps:
dividing one frame of picture display time into N display time periods; n is an integer greater than 1;
providing an nth driving voltage to the driving voltage terminal in an nth display period; the nth display period corresponds to the nth driving voltage; n is a positive integer less than or equal to N;
the driving voltages corresponding to the at least two display periods are different from each other.
Optionally, the duration of the N display periods included in the display time of one frame is the same.
Optionally, the durations of the at least two display periods are different from each other.
Optionally, N is equal to 2; the step of supplying the nth driving voltage to the driving voltage terminal in the nth display period includes:
providing a first driving voltage to the driving voltage terminal in a first display period;
providing a second driving voltage to the driving voltage terminal in a second display period;
the first driving voltage is different from the second driving voltage;
the first display period lasts for the same time as the second display period lasts; alternatively, the first display period may last for a different time than the second display period.
Optionally, N is equal to 4; the step of supplying the nth driving voltage to the driving voltage terminal in the nth display period includes:
providing a first driving voltage to the driving voltage terminal in a first display period;
providing a second driving voltage to the driving voltage terminal in a second display period;
providing a third driving voltage to the driving voltage terminal in a third display period;
supplying a fourth driving voltage to the driving voltage terminal for a fourth display period;
the first driving voltage is the same as the second driving voltage, the third driving voltage is the same as the fourth driving voltage, and the first driving voltage is different from the third driving voltage; the first driving voltage, the second driving voltage and the third driving voltage are the same, and the first driving voltage is different from the fourth driving voltage; or the second driving voltage, the third driving voltage and the fourth driving voltage are the same, and the first driving voltage is different from the fourth driving voltage;
the first display period lasts for the same time, the second display period lasts for the same time, the third display period lasts for the same time, and the fourth display period lasts for the same time.
The invention also provides a voltage supply device, which is applied to a pixel circuit, wherein the pixel circuit comprises a driving unit, a first end of the driving unit is electrically connected with a driving voltage end, and a second end of the driving unit is electrically connected with a light-emitting element; the voltage supply device includes:
the driving voltage providing unit is used for providing an nth driving voltage to the driving voltage end in an nth display time period included in one frame of picture display time; the nth display period corresponds to the nth driving voltage;
dividing one frame of picture display time into N display time periods, wherein N is an integer greater than 1; n is a positive integer less than or equal to N; the driving voltages corresponding to the at least two display periods are different from each other.
Optionally, the duration of the N display periods included in the display time of one frame is the same.
Optionally, the durations of the at least two display periods are different from each other.
Optionally, the driving voltage providing unit includes a control signal generating module and a driving voltage providing module;
the control signal generation module is used for generating a control clock signal;
the driving voltage providing module is used for providing an nth driving voltage to the driving voltage end in an nth display time period according to the control clock signal.
Optionally, the control signal generating module includes a voltage-controlled delay line, a phase selector, a phase discriminator, and a charge pump;
the phase discriminator is used for detecting the phase difference between the input clock signal and the feedback clock signal;
the charge pump is used for generating a control voltage and providing the control voltage to the voltage control delay line;
the voltage control delay line is used for converting the input clock signal into a plurality of control clock signals under the control of the control voltage and providing the control clock signals to the phase selector;
the phase selector is configured to select a control clock signal from the plurality of control clock signals and provide the control clock signal to the driving voltage providing module, so that the driving voltage providing module provides an nth driving voltage to the driving voltage terminal in an nth display time period under the control of the control clock signal.
The invention also provides a display device, which comprises the voltage supply device;
the display device includes a plurality of pixel circuits; the voltage supply device is used for supplying a driving voltage for the pixel circuit.
The invention also provides electronic equipment comprising the display device.
The voltage providing method, the voltage providing device, the display device and the electronic equipment divide one frame of picture display time into N display time periods, provide the nth driving voltage to the driving voltage end in the nth display time period, and control the driving voltages respectively corresponding to at least two display time periods to be different from each other, so that the average driving current flowing through the light-emitting element is adjusted in the frame of picture display time, the average current can be accurately controlled, and the light-emitting brightness of the light-emitting element can be accurately adjusted.
Drawings
FIG. 1 is a block diagram of one embodiment of a pixel circuit;
FIG. 2 is a circuit diagram of one embodiment of a pixel circuit;
fig. 3 is a waveform diagram of a driving voltage provided by a driving voltage terminal Vd in a first embodiment of a voltage providing method according to the present invention;
fig. 4 is a waveform diagram of a driving voltage provided by a driving voltage terminal Vd in a second embodiment of the voltage providing method according to the present invention;
fig. 5 is a waveform diagram of a driving voltage provided by a driving voltage terminal Vd in a third embodiment of the voltage providing method according to the present invention;
fig. 6 is a waveform diagram of a driving voltage provided by a driving voltage terminal Vd in a fourth embodiment of the voltage providing method according to the present invention;
fig. 7 is a waveform diagram of a driving voltage provided by a driving voltage terminal Vd in a fifth embodiment of the voltage providing method according to the present invention;
fig. 8 is a waveform diagram of a driving voltage supplied from a driving voltage terminal Vd in a sixth embodiment of a voltage supplying method according to the present invention;
FIG. 9 is a block diagram of one embodiment of a control signal generation module;
fig. 10 is a waveform diagram of a control clock signal Clkc supplied from a phase selector 92 to a driving voltage supply block 90 in the first embodiment of the voltage supply method according to the present invention.
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 method is applied to a pixel circuit, the pixel circuit comprises a driving unit, a first end of the driving unit is electrically connected with a driving voltage end, and a second end of the driving unit is electrically connected with a light-emitting element; the voltage supply method comprises the following steps:
dividing one frame of picture display time into N display time periods; n is an integer greater than 1;
providing an nth driving voltage to the driving voltage terminal in an nth display period; the nth display period corresponds to the nth driving voltage;
the driving voltages respectively corresponding to the at least two display time periods are different from each other;
n is a positive integer less than or equal to N.
In the embodiment of the invention, one frame of picture display time is divided into N display time periods, in the nth display time period, the nth driving voltage is provided to the driving voltage end, and the driving voltages respectively corresponding to at least two display time periods are controlled to be different from each other, so that the average driving current flowing through the light-emitting element is adjusted in the frame of picture display time, and the average current can be accurately controlled, so that the light-emitting brightness of the light-emitting element can be accurately adjusted.
In a specific implementation, the Light Emitting element may be an OLED (Organic Light Emitting Diode), but is not limited thereto. In practice, the light emitting element may be other types of light emitting diodes.
In an embodiment of the present invention, the pixel circuit includes a driving unit, the driving unit turns on or off a connection between the driving voltage terminal and the light emitting element under control of a potential of a control terminal thereof, and controls a driving current for driving the light emitting element to emit light according to the potential of the control terminal and a driving voltage provided by the driving voltage terminal when the driving unit controls the connection between the driving voltage terminal and the light emitting element to be turned on.
In actual operation, the pixel circuit may further include a data writing unit for controlling writing of a data voltage to the control terminal of the driving unit.
As shown in fig. 1, an embodiment of the pixel circuit includes a driving unit 11, a data writing unit 12, and a storage capacitor Cs, wherein a first terminal of the driving unit 11 is electrically connected to a driving voltage terminal Vd, and a second terminal of the driving unit 11 is electrically connected to an anode of an organic light emitting diode O1; the cathode of the organic light emitting diode O1 is electrically connected with a ground terminal GND;
the control end of the data writing unit 12 is electrically connected with the scanning line S1, the first end of the data writing unit 12 is electrically connected with the data line D1, and the second end of the data writing unit 12 is electrically connected with the control end of the driving unit 11;
a first end of the storage capacitor Cs is electrically connected with a control end of the driving unit 11, and a second end of the storage capacitor Cs is electrically connected with a ground end GND;
the driving unit 11 is configured to turn on or off the connection between the driving voltage terminal Vd and the organic light emitting diode O1 under the control of the potential of the control terminal thereof, and control a driving current for driving the organic light emitting diode O1 to emit light according to the potential of the control terminal of the driving unit 11 and the driving voltage provided by the driving voltage terminal Vd when the driving unit 11 controls the connection between the driving voltage terminal Vd and the organic light emitting diode O1 to be turned on;
the data writing unit 12 is used for controlling the writing of the data voltage provided by the data line D1 into the control terminal of the driving unit 11 under the control of the scan signal provided by the scan line S1.
In operation of the embodiment of the pixel circuit shown in fig. 1, when the driving unit 11 drives O1 to emit light, the driving current of the driving O1 provided by the driving unit to emit light is related to the data voltage and the driving voltage provided by the driving voltage terminal Vd.
As shown in fig. 2, on the basis of the embodiment of the pixel driving circuit shown in fig. 1, the driving unit includes a driving transistor T1, and the data writing unit includes a data writing transistor T2;
the grid of the T1 is electrically connected with the drain of the T2, the source of the T1 is electrically connected with the Vd, and the drain of the T1 is electrically connected with the anode of the O1;
the gate of T2 is electrically connected to S1, and the source of T2 is electrically connected to D1.
According to one embodiment, the display time of one frame includes the same duration of the N display periods.
According to another embodiment, the at least two display periods last for different times from each other.
In actual operation, the display time of one frame of picture may be equally divided into N display time periods, or the duration of each display time period may not be completely the same.
In a specific implementation, in one case, a frame display time may be averagely divided into a plurality of display time periods, in each display time period, the first driving voltage Vn or the second driving voltage Vn +1 is applied to the driving voltage terminal Vd, Vn is not equal to Vn +1, and in the display time periods included in the frame display time, Vn and Vn +1 are applied at least once, so as to adjust an average driving current of the light emitting elements in the whole frame period;
in another case, the one-frame screen display time may be averagely divided into a plurality of display periods, the duration of each display period is not exactly the same, in each display period, the first driving voltage Vn or the second driving voltage Vn +1 is applied to the driving voltage terminal Vd, Vn is not equal to Vn +1, and in the display periods included in the one-frame screen display time, Vn +1 are applied at least once, thereby realizing adjustment of the average driving current of the light emitting elements throughout the whole frame period.
Alternatively, N may be equal to 2; the step of supplying the nth driving voltage to the driving voltage terminal in the nth display period includes:
providing a first driving voltage to the driving voltage terminal in a first display period;
providing a second driving voltage to the driving voltage terminal in a second display period;
the first driving voltage is different from the second driving voltage;
the first display period lasts for the same time as the second display period lasts; alternatively, the first display period may last for a different time than the second display period.
Alternatively, N may be equal to 4; the step of supplying the nth driving voltage to the driving voltage terminal in the nth display period includes:
providing a first driving voltage to the driving voltage terminal in a first display period;
providing a second driving voltage to the driving voltage terminal in a second display period;
providing a third driving voltage to the driving voltage terminal in a third display period;
supplying a fourth driving voltage to the driving voltage terminal for a fourth display period;
the first driving voltage is the same as the second driving voltage, the third driving voltage is the same as the fourth driving voltage, and the first driving voltage is different from the third driving voltage; the first driving voltage, the second driving voltage and the third driving voltage are the same, and the first driving voltage is different from the fourth driving voltage; or the second driving voltage, the third driving voltage and the fourth driving voltage are the same, and the first driving voltage is different from the fourth driving voltage;
the first display period lasts for the same time, the second display period lasts for the same time, the third display period lasts for the same time, and the fourth display period lasts for the same time.
In operation of the embodiment of the pixel driving circuit shown in fig. 2, during one frame display time, the driving current through O1 may be 3.7mA (but not limited thereto) when a voltage of 870mV is applied to Vd, and the driving current through O1 may be 3.5mA (but not limited thereto) when a voltage of 860mV is applied to Vd.
The voltage supply method according to the invention is illustrated below by means of six specific examples.
As shown in fig. 3, in the first embodiment of the voltage supplying method according to the present invention, one frame screen display time FM is averagely divided into the first display period FM1, the second display period FM2, the third display period FM3 and the fourth display period FM4 by increasing the frame rate;
applying 870mV voltage to Vd in FM1 and FM2, and 860mV voltage to Vd in FM3 and FM 4;
then the drive current through O1 is 3.7mA in FM1 and FM2, and the drive current through O1 is 3.5mA in FM3 and FM 4; the average current through the O1 is accumulated to be (3.7 multiplied by 2+3.5 multiplied by 2)/4 to 3.6mA in the display time of a complete frame, namely, the aim of adjusting the average driving current through the O1 to be between 3.5mA and 3.7mA is achieved under the condition of not adjusting the applicable voltage, and the resolution of the driving current is improved.
As for the change in the light emission luminance of O1 caused by changing the applied drive voltage in each display period, since the human eye is a natural low-pass filter, the human eye can observe only the average value of the light emission luminance in each display period within one frame screen display time without noticing the change in the light emission luminance in each display period.
As shown in fig. 4, in the second embodiment of the voltage supplying method according to the present invention, one frame screen display time FM is averagely divided into a first display time period FM1, a second display time period FM2, a third display time period FM3 and a fourth display time period FM4 by increasing the frame rate;
applying 870mV voltage to Vd in FM1, FM2, and FM3, and 860mV voltage to Vd in FM 4;
then the drive current through O1 is 3.7mA in FM1, FM2, and FM3, and 3.5mA in FM4 through O1; the average current through the O1 is accumulated to be (3.7 multiplied by 3+3.5)/4 ═ 3.65mA in the display time of a complete frame, namely, under the condition of not adjusting the applicable voltage, the aim of adjusting the average driving current through the O1 to be 3.5mA-3.7mA is achieved, and the resolution of the driving current is improved.
As shown in fig. 5, in the third embodiment of the voltage supplying method according to the present invention, one frame screen display time FM is averagely divided into a first display time period FM1, a second display time period FM2, a third display time period FM3 and a fourth display time period FM4 by increasing the frame rate;
applying 870mV voltage to Vd in FM1 and 860mV voltage to Vd in FM2, FM3 and FM 4;
then in FM1 the drive current through O1 is 3.7mA and in FM2, FM3 and FM4 the drive current through O1 is 3.5 mA; the average current through the O1 is accumulated to be (3.7+3.5 multiplied by 3)/4 to 3.55mA in the display time of a complete frame, namely, the average driving current through the O1 is adjusted to be between 3.5mA and 3.7mA without adjusting the applicable voltage, and the resolution of the driving current is improved.
As shown in fig. 6, in the fourth embodiment of the voltage supplying method according to the present invention, by increasing the frame rate, one frame picture display time FM is equally divided into the first display time period FM1 and the second display time period FM 2;
applying 870mV voltage to Vd in FM1 and 860mV voltage to Vd in FM 2;
then in FM1 the drive current through O1 was 3.7mA and in FM2 the drive current through O1 was 3.5 mA; the average current through the O1 is accumulated to be (3.7+ 3.5)/4-3.6 mA in the display time of a complete frame, namely, the average driving current through the O1 is adjusted to be between 3.5mA and 3.7mA without adjusting the applicable voltage, and the resolution of the driving current is improved.
As shown in fig. 7, in the fifth embodiment of the voltage supplying method according to the present invention, by increasing the frame rate, one frame picture display time FM is divided into a first display time period FM1 and a second display time period FM 2; the first display period FM1 lasts 3/4 of the duration of the one-frame screen display time FM, and the second display period FM2 lasts 1/4 of the duration of the one-frame screen display time FM;
applying 870mV voltage to Vd in FM1 and 860mV voltage to Vd in FM 2;
then in FM1 the drive current through O1 was 3.7mA and in FM2 the drive current through O1 was 3.5 mA; the average current through the O1 is accumulated to be (3.7 multiplied by 3/4+3.5 multiplied by 1/4) to be 3.65mA in the display time of a complete one-frame picture, namely, the average driving current through the O1 is adjusted to be 3.5mA-3.7mA without adjusting the applicable voltage, and the resolution of the driving current is improved.
As shown in fig. 8, in the sixth embodiment of the voltage supplying method according to the present invention, by increasing the frame rate, one frame picture display time FM is divided into a first display time period FM1 and a second display time period FM 2; the first display period FM1 lasts 1/4 of the duration of the one-frame screen display time FM, and the second display period FM2 lasts 3/4 of the duration of the one-frame screen display time FM;
applying 870mV voltage to Vd in FM1 and 860mV voltage to Vd in FM 2;
then in FM1 the drive current through O1 was 3.7mA and in FM2 the drive current through O1 was 3.5 mA; the average current through the O1 is accumulated to be (3.7 multiplied by 1/4+3.5 multiplied by 3/4) to be 3.55mA in the display time of a complete one-frame picture, namely, the average driving current through the O1 is adjusted to be 3.5mA-3.7mA without adjusting the applicable voltage, and the resolution of the driving current is improved.
The voltage supply device provided by the embodiment of the invention is applied to a pixel circuit, the pixel circuit comprises a driving unit, a first end of the driving unit is electrically connected with a driving voltage end, and a second end of the driving unit is electrically connected with a light-emitting element; the voltage supply device includes:
the driving voltage providing unit is used for providing an nth driving voltage to the driving voltage end in an nth display time period included in one frame of picture display time; the nth display period corresponds to the nth driving voltage;
dividing one frame of picture display time into N display time periods, wherein N is an integer greater than 1; n is a positive integer less than or equal to N; the driving voltages corresponding to the at least two display periods are different from each other.
In the embodiment of the present invention, a frame of image display time is divided into N display time periods, the driving voltage providing unit is configured to provide an nth driving voltage to the driving voltage terminal in an nth display time period, and control driving voltages corresponding to at least two display time periods to be different from each other, so as to adjust an average driving current flowing through a light emitting element in the frame of image display time, and accurately control the average current, so as to accurately adjust a light emitting brightness of the light emitting element.
According to one embodiment, the display time of one frame includes the same duration of the N display periods.
According to another embodiment, the at least two display periods last for different times from each other.
In actual operation, the display time of one frame of picture may be equally divided into N display time periods, or the duration of each display time period may not be completely the same.
In a specific implementation, the driving voltage providing unit may include a control signal generating module and a driving voltage providing module;
the control signal generation module is used for generating a control signal;
the driving voltage providing module is used for providing an nth driving voltage to the driving voltage end in an nth display time period according to the control signal.
Optionally, the control signal generating module may include a voltage-controlled delay line, a phase selector, a phase detector, and a charge pump;
the phase discriminator is used for detecting the phase difference between the input clock signal and the feedback clock signal;
the charge pump is used for generating a control voltage and providing the control voltage to the voltage control delay line;
the voltage control delay line is used for converting the input clock signal into a plurality of control clock signals under the control of the control voltage and providing the control clock signals to the phase selector;
the phase selector is configured to select a control clock signal from the plurality of control clock signals and provide the control clock signal to the driving voltage providing module, so that the driving voltage providing module provides an nth driving voltage to the driving voltage terminal in an nth display time period under the control of the control clock signal.
In the embodiment of the present invention, as shown in fig. 9, the control signal generation module may include a voltage controlled delay line 91, a phase selector 92, a phase detector 93, and a charge pump 94;
the voltage control delay line 91, the phase detector 93 and the charge pump 94 form a delay phase-locked loop;
the phase discriminator 93 is configured to detect a phase difference between the input clock signal and the feedback clock signal;
the charge pump 94 is configured to generate a control voltage Vc, and provide the control voltage Vc to the voltage control delay line 91;
the voltage controlled delay line 91 is configured to convert an input clock signal Clki into a plurality of control clock signals and provide the plurality of control clock signals to the phase selector 92;
the phase selector 92 is configured to select one control clock signal from the plurality of control clock signals and provide the control clock signal to the driving voltage providing module 90, so that the driving voltage providing module 90 provides the nth driving voltage to the driving voltage terminal in the nth display period under the control of the control clock signal.
In fig. 9, reference numeral Vdd is a power supply voltage.
In fig. 9, reference numeral C0 denotes a hysteresis filter capacitor;
the voltage controlled delay line 91 operates under the control of the control voltage Vc.
For example, in the first specific embodiment of the voltage supplying method according to the present invention, the one-frame screen display time FM is equally divided into the first display time period FM1, the second display time period FM2, the third display time period FM3, and the fourth display time period FM 4; applying 870mV voltage to Vd in FM1 and FM2, and 860mV voltage to Vd in FM3 and FM 4; the waveform of the control clock signal Clkc supplied from the phase selector 92 to the driving voltage supply module 90 may be as shown in fig. 10, the potential of the control clock signal Clkc may be a high voltage at FM1 and FM2, and the potential of the control clock signal Clkc may be a low voltage at FM3 and FM 4; the driving voltage providing module 90 is used for providing 870mV voltage for Vd when the potential of Clkc is high voltage; the driving voltage providing module is used for providing 860mV voltage for Vd when the potential of Clkc is low.
The display device of the embodiment of the invention comprises the voltage supply device;
the display device includes a plurality of pixel circuits; the voltage supply device is used for supplying a driving voltage for the pixel circuit.
The electronic device according to the embodiment of the invention includes the display device.
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 (12)
1. A voltage supply method is applied to a pixel circuit, the pixel circuit comprises a driving unit, a first end of the driving unit is electrically connected with a driving voltage end, and a second end of the driving unit is electrically connected with a light-emitting element; the voltage providing method is characterized by comprising the following steps:
dividing one frame of picture display time into N display time periods; n is an integer greater than 1;
providing an nth driving voltage to the driving voltage terminal in an nth display period; the nth display period corresponds to the nth driving voltage; n is a positive integer less than or equal to N;
the driving voltages corresponding to the at least two display periods are different from each other.
2. The voltage supplying method according to claim 1, wherein the display time of one frame includes N display periods lasting the same time.
3. The voltage supplying method of claim 1, wherein at least two display periods are continued for different times from each other.
4. The voltage supply method of claim 1 wherein N is equal to 2; the step of supplying the nth driving voltage to the driving voltage terminal in the nth display period includes:
providing a first driving voltage to the driving voltage terminal in a first display period;
providing a second driving voltage to the driving voltage terminal in a second display period;
the first driving voltage is different from the second driving voltage;
the first display period lasts for the same time as the second display period lasts; alternatively, the first display period may last for a different time than the second display period.
5. The voltage supply method of claim 1 wherein N is equal to 4; the step of supplying the nth driving voltage to the driving voltage terminal in the nth display period includes:
providing a first driving voltage to the driving voltage terminal in a first display period;
providing a second driving voltage to the driving voltage terminal in a second display period;
providing a third driving voltage to the driving voltage terminal in a third display period;
supplying a fourth driving voltage to the driving voltage terminal for a fourth display period;
the first driving voltage is the same as the second driving voltage, the third driving voltage is the same as the fourth driving voltage, and the first driving voltage is different from the third driving voltage; the first driving voltage, the second driving voltage and the third driving voltage are the same, and the first driving voltage is different from the fourth driving voltage; or the second driving voltage, the third driving voltage and the fourth driving voltage are the same, and the first driving voltage is different from the fourth driving voltage;
the first display period lasts for the same time, the second display period lasts for the same time, the third display period lasts for the same time, and the fourth display period lasts for the same time.
6. A voltage supply device is applied to a pixel circuit, the pixel circuit comprises a driving unit, a first end of the driving unit is electrically connected with a driving voltage end, and a second end of the driving unit is electrically connected with a light-emitting element; characterized in that the voltage supply means comprises:
the driving voltage providing unit is used for providing an nth driving voltage to the driving voltage end in an nth display time period included in one frame of picture display time; the nth display period corresponds to the nth driving voltage;
dividing one frame of picture display time into N display time periods, wherein N is an integer greater than 1; n is a positive integer less than or equal to N; the driving voltages corresponding to the at least two display periods are different from each other.
7. The voltage supplying apparatus according to claim 6, wherein the display time of one frame includes N display periods lasting the same time.
8. The voltage supply apparatus according to claim 6, wherein at least two display periods are continued for different times from each other.
9. The voltage providing apparatus of claim 6, wherein the driving voltage providing unit includes a control signal generating module and a driving voltage providing module;
the control signal generation module is used for generating a control clock signal;
the driving voltage providing module is used for providing an nth driving voltage to the driving voltage end in an nth display time period according to the control clock signal.
10. The voltage providing apparatus of claim 9, wherein the control signal generation module comprises a voltage controlled delay line, a phase selector, a phase detector, and a charge pump;
the phase discriminator is used for detecting the phase difference between the input clock signal and the feedback clock signal;
the charge pump is used for generating a control voltage and providing the control voltage to the voltage control delay line;
the voltage control delay line is used for converting the input clock signal into a plurality of control clock signals under the control of the control voltage and providing the control clock signals to the phase selector;
the phase selector is configured to select a control clock signal from the plurality of control clock signals and provide the control clock signal to the driving voltage providing module, so that the driving voltage providing module provides an nth driving voltage to the driving voltage terminal in an nth display time period under the control of the control clock signal.
11. A display device comprising the voltage supply device according to any one of claims 6 to 10;
the display device includes a plurality of pixel circuits; the voltage supply device is used for supplying a driving voltage for the pixel circuit.
12. An electronic device characterized by comprising the display device according to claim 11.
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