CN109272941B - Drive compensation unit, drive compensation method and display device - Google Patents
Drive compensation unit, drive compensation method and display device Download PDFInfo
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- 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]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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Abstract
The invention provides a drive compensation unit, a drive compensation method and a display device. The driving compensation unit comprises a current detection circuit, a compensation data voltage generation circuit and a compensation circuit; the current detection circuit is used for detecting the nth current value and detecting the (n + 1) th current value in the detection driving period; n is a positive integer less than or equal to N, N being an integer greater than 1; the compensation data voltage generating circuit is used for generating a compensation data voltage; the compensation circuit is used for compensating data voltage on the corresponding column data line according to the compensation data voltage in a compensation driving period when the (n + 1) th row of grid lines is opened. The invention can reduce the design complexity of the pixel driving circuit in the effective display area of the display panel on the premise of ensuring or improving the quality of the display picture, and the embodiment of the invention not only can compensate the pixel current offset caused by the threshold value electric drift of the transistor, but also can compensate the pixel current offset caused by other processes.
Description
Technical Field
The present invention relates to the field of display driving technologies, and in particular, to a driving compensation unit, a driving compensation method, and a display device.
Background
Since the organic light emitting diode is a current-driven display device, the uniformity of the current in the AMOLED (Active-matrix organic light emitting diode) display panel directly affects the uniformity of the display brightness, and any factor causing the current deviation significantly affects the display effect of the AMOLED display panel.
As shown in fig. 1, the conventional 2T1C pixel driving circuit includes a driving transistor T2, a data writing transistor T, and a storage capacitor Cst, and T2 drives an organic light emitting diode OLED to emit light. In fig. 1, Data is a Data line, Gate is a Gate line, VDD is a power voltage, and VSS is a low voltage. The driving current Ion of the T2 driving the OLED is related to the threshold voltage of T2, and in order to compensate for the threshold voltage, in the prior art, a transistor is usually added on the basis of a 2T1C pixel driving circuit, thereby resulting in a decrease in the pixel aperture ratio. Further, the requirement of the AMOLED display for current uniformity cannot be satisfied only by performing the threshold compensation, and the current misalignment may be caused by process variations (for example, variation in the thickness of the insulating layer, variation in the aspect ratio of the transistor, and the like).
Disclosure of Invention
The present invention is directed to a driving compensation unit, a driving compensation method, and a display device, which solve the problem that the pixel aperture ratio of the effective display area of the display panel is low and the current misalignment caused by the process deviation cannot be compensated when the display driving compensation is performed in the prior art.
In order to achieve the above object, the present invention provides a driving compensation unit applied to a pixel circuit, where the pixel circuit includes N sub-pixel circuits located in an mth column, the N sub-pixel circuits are all connected to an mth column power voltage line, the N sub-pixel circuits are all connected to an mth column data line, m is a positive integer, and N is an integer greater than 1; the driving compensation unit includes a current detection circuit, a compensation data voltage generation circuit, and a compensation circuit, wherein,
the current detection circuit is used for detecting an nth current value flowing through the mth column power voltage line when the nth row grid line is opened and detecting an n +1 th current value flowing through the mth column power voltage line when the (n + 1) th row grid line is opened in a detection driving period; n is a positive integer less than or equal to N;
the compensation data voltage generating circuit is used for calculating a current difference value between the n +1 th current value and the nth current value, calculating a difference value between the current difference value and a preset current difference value, determining the difference value as an actual current difference value, and generating a compensation data voltage according to the actual current difference value when the absolute value of the actual current difference value is greater than a preset deviation threshold value;
the compensation circuit is used for compensating the data voltage on the mth column data line according to the compensation data voltage in a compensation driving period when the (n + 1) th row of grid lines is opened.
In practice, the compensation data voltage generation circuit includes a calculation sub-circuit, a comparison sub-circuit, and a compensation data voltage generation sub-circuit, wherein,
the calculating sub-circuit is connected with the current detection circuit and is used for calculating a current difference value between the n +1 th current value and the nth current value, calculating a difference value between the current difference value and a preset current difference value and determining the difference value as an actual current difference value;
the comparison sub-circuit is connected with the calculation sub-circuit and used for comparing the absolute value of the actual current difference with a preset deviation threshold value and sending a generation control signal to the compensation data voltage generation sub-circuit when the absolute value of the actual current difference is larger than the preset deviation threshold value;
and the compensation data voltage generating sub-circuit is respectively connected with the calculating sub-circuit and the comparing sub-circuit and is used for generating the compensation data voltage according to the actual current difference after receiving the generation control signal.
In implementation, the compensation circuit is configured to, in a compensation driving period, add an original data voltage provided by the data driving unit to the compensation data voltage when the (n + 1) th row of gate lines is opened to obtain a compensated data voltage, and provide the compensated data voltage to the mth column of data lines.
The invention also provides a driving compensation method which is applied to a pixel circuit, wherein the pixel circuit comprises N sub-pixel circuits positioned in the mth column, the N sub-pixel circuits are all connected with the mth column power voltage line, the N sub-pixel circuits are all connected with the mth column data line, m is a positive integer, and N is an integer greater than 1; the drive compensation method includes:
in the detection driving period, the current detection circuit detects an nth current value flowing through the mth column power voltage line when the nth row gate line is turned on, and detects an n +1 th current value flowing through the mth column power voltage line when the n +1 th row gate line is turned on; n is a positive integer less than or equal to N;
the compensation data voltage generation circuit calculates a current difference value between the n +1 th current value and the nth current value, calculates a difference value between the current difference value and a preset current difference value, determines the difference value as an actual current difference value, and generates a compensation data voltage according to the actual current difference value when the absolute value of the actual current difference value is greater than a preset deviation threshold value;
in a compensation driving period, when the (n + 1) th row of gate lines is opened, the compensation circuit compensates the data voltage on the m-th column of data lines according to the compensation data voltage.
In implementation, the compensation data voltage generation circuit comprises a calculation sub-circuit, a comparison sub-circuit and a compensation data voltage generation sub-circuit;
the step of generating the compensation data voltage according to the actual current difference when the absolute value of the actual current difference is greater than the predetermined deviation threshold includes:
the calculation sub-circuit calculates a current difference value between the n +1 th current value and the nth current value, calculates a difference value between the current difference value and a preset current difference value, and determines the difference value as an actual current difference value;
the comparison sub-circuit compares the absolute value of the actual current difference with a predetermined deviation threshold, and sends a generation control signal to the compensation data voltage generation sub-circuit when the absolute value of the actual current difference is greater than the predetermined deviation threshold;
and the compensation data voltage generating sub-circuit generates the compensation data voltage according to the actual current difference after receiving the generation control signal.
In implementation, in the compensation driving period, when the gate line in the (n + 1) th row is turned on, the compensating circuit compensates the data voltage on the data line in the m-th column according to the compensated data voltage, including:
in a compensation driving period, when the (n + 1) th row of gate lines is opened, the compensation circuit adds an original data voltage provided by the data driving unit to the compensation data voltage to obtain a compensated data voltage, and provides the compensated data voltage to the mth column of data lines.
In practice, the driving compensation method of the present invention further comprises: when the actual current difference is larger than 0, the compensation data voltage generation circuit controls the compensation data voltage to be negative voltage;
when the actual current difference is smaller than 0, the compensation data voltage generation circuit controls the compensation data voltage to be a positive voltage.
The invention also provides a display device which comprises the drive compensation unit.
In implementation, the display device further comprises a display panel, a data driving circuit and a power supply voltage control circuit; the display panel comprises a display substrate, M pixel circuits, M rows of power supply voltage lines, M rows of data lines and N rows of grid lines; the M pixel circuits, the M columns of power supply voltage lines, the M columns of data lines and the N rows of grid lines are all arranged on the display substrate; m and N are both positive integers; m is a positive integer less than or equal to M, N is a positive integer less than or equal to N;
the m-th pixel circuit includes N sub-pixel circuits located in the m-th column; the N sub-pixel circuits positioned in the mth column are all connected with an mth column power supply voltage line, and the N sub-pixel circuits positioned in the mth column are all connected with an mth column data line;
the data driving circuit comprises a data driving unit for providing original data voltages respectively corresponding to the M columns of data lines;
the compensation circuit included in the driving compensation unit is disposed in the data driving circuit.
In implementation, the data driving circuit and the power supply voltage control circuit are arranged in the same integrated circuit.
Compared with the prior art, the drive compensation unit, the drive compensation method and the display device provided by the embodiment of the invention reduce the design complexity of the pixel drive circuit in the AA area of the display panel on the premise of ensuring or improving the AMOLED display image quality, so that the aperture ratio and the reliability of the AMOLED display panel are obviously improved, and the embodiment of the invention not only can compensate the pixel current offset caused by the threshold voltage Vth drift of the transistor, but also can compensate the pixel current offset caused by other processes.
Drawings
Fig. 1 is a circuit diagram of a conventional 2T1C pixel driving circuit;
fig. 2 is a structural view of a drive compensation unit according to an embodiment of the present invention;
fig. 3 is a structural view of a drive compensation unit according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of the ideal current value Ion _ vdd-s flowing through the corresponding column power voltage line when the gate lines of each row are turned on during the detection driving period versus time t;
fig. 5 is a diagram showing a relationship between a current value Ion _ vdd flowing through a corresponding column power voltage line and time t when each row gate line is turned on in a detection driving period;
FIG. 6 is a diagram illustrating the relationship between the gate-source voltage V of the driving transistor in the sub-pixel circuit of the corresponding column of the (n + 1) th row and the pixel current I flowing through the driving transistor;
fig. 7 is a schematic structural relationship diagram of a display panel, a data driving chip and a power voltage supplying chip included in the display device according to the embodiment of the invention;
fig. 8 is a schematic structural relationship diagram of a display panel and a driving integrated circuit included in the display device according to the embodiment of 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 driving compensation unit is applied to a pixel circuit, the pixel circuit comprises N sub-pixel circuits located in an mth column, the N sub-pixel circuits are all connected with an mth column power voltage line, the N sub-pixel circuits are all connected with an mth column data line, m is a positive integer, and N is an integer greater than 1; as shown in fig. 2, the driving compensation unit includes a current detection circuit 21, a compensation data voltage generation circuit 22, and a compensation circuit 23, wherein,
the current detection circuit 21 is configured to detect, in the detection drive period, an nth current value flowing through the mth column power supply voltage line when the nth row gate line is turned on, and detect an n +1 th current value flowing through the mth column power supply voltage line when the n +1 th row gate line is turned on; n is a positive integer less than or equal to N;
the compensation data voltage generating circuit 22 is connected to the current detecting circuit 21, and is configured to calculate a current difference between the n +1 th current value and the nth current value, calculate a difference between the current difference and a predetermined current difference, determine that the difference is an actual current difference, and generate a compensation data voltage according to the actual current difference when an absolute value of the actual current difference is greater than a predetermined deviation threshold;
the compensation circuit 23 is connected to the compensation data voltage generation circuit 22, and configured to compensate the data voltage on the m-th column data line according to the compensation data voltage in a compensation driving period when the (n + 1) -th row of gate lines is opened.
In practical operation, in a detection driving period, in a time period from when the nth row gate line is turned on to when the n +1 th row gate line is turned on, a current value flowing through the mth column power voltage line may become large, a current difference value between the n +1 th current value and the nth current value is a positive value, and the predetermined current difference value is also a positive value; alternatively, the value of the current flowing through the m-th column power supply voltage line may be decreased, where the current difference between the n + 1-th current value and the n-th current value is a negative value, and the predetermined current difference is also a positive value. And when the current difference is larger than the predetermined current difference, the actual current difference is larger than 0, and when the current difference is smaller than the predetermined current difference, the actual current difference is smaller than 0.
In specific implementation, the predetermined current difference value can be calculated according to actual conditions. In the case of a light emitting element (for example, an organic light emitting diode) of a specified specification, when the light emitting element emits light, there is a unique one-to-one correspondence relationship between a current value flowing through the light emitting element and a data voltage supplied to a sub-pixel circuit including the light emitting element, without considering a threshold voltage shift of a transistor, and therefore the predetermined current difference value can be calculated from a difference value between an nth data voltage supplied to an mth column data line when an nth row gate line is turned on and an n +1 th data voltage supplied to an mth column data line when an n +1 th row gate line is turned on.
In a specific implementation, the predetermined deviation threshold may be selected according to an actual situation, and when the absolute value of the actual current difference is greater than the predetermined deviation threshold, it is determined that data voltage compensation is required.
In actual operation, the compensation driving period is set after the detection driving period; for example, when the compensation driving period is the first frame display time, the detection driving period may be the second frame display time to the twentieth frame display time, or the detection driving period may also be the fourth frame display time to the twentieth frame display time; the next compensation driving period may be a twenty-first frame picture display time.
In the embodiment of the invention, the display panel comprises a display substrate and N rows and M columns of sub-pixel circuits arranged on the display substrate, wherein the N sub-pixel circuits positioned on the mth column form a pixel circuit, and a power supply voltage is provided for the N sub-pixel circuits positioned on the mth column through a single power supply voltage line.
In the display device adopting the drive compensation unit of the embodiment of the invention, the structure of the pixel drive circuit in the AA area of the display panel can be simpler, a plurality of transistors are not needed to be adopted for threshold voltage compensation, and the aperture ratio of the display panel can be improved.
In practical operation, the display panel may be an AMOLED (Active-matrix organic light-emitting diode) display panel, but is not limited thereto.
The embodiment of the invention provides a driving compensation unit aiming at the problems that the pixel driving circuit in an AMOLED display panel is complex in design (the number of adopted transistors and the number of capacitors are large) and poor in effect (the existing pixel driving circuit only aims at a certain main factor, such as the threshold voltage Vth of the transistors, and the condition of uneven display brightness caused by other processes is ignored), and the design complexity of the pixel driving circuit in the AA area of the display panel is reduced on the premise of ensuring or improving the AMOLED display picture quality, so that the aperture ratio and the reliability of the AMOLED display panel are obviously improved.
The driving compensation unit disclosed by the embodiment of the invention not only can compensate pixel current offset caused by threshold voltage Vth drift of the transistor, but also can compensate pixel current offset caused by other processes.
Specifically, as shown in fig. 3, on the basis of the embodiment of the driving compensation unit shown in fig. 2, the compensation data voltage generation circuit 22 includes a calculation sub-circuit 221, a comparison sub-circuit 222, and a compensation data voltage generation sub-circuit 223, wherein,
the calculating sub-circuit 221 is connected to the current detecting circuit 21, and is configured to calculate a current difference between the n +1 th current value and the nth current value, calculate a difference between the current difference and a predetermined current difference, and determine the difference as an actual current difference;
the comparison sub-circuit 222 is connected to the calculation sub-circuit 221, and is configured to compare the absolute value of the actual current difference with a predetermined deviation threshold, and send a generation control signal to the compensation data voltage generation sub-circuit 223 when the absolute value of the actual current difference is greater than the predetermined deviation threshold;
the compensation data voltage generating sub-circuit 223 is respectively connected to the calculating sub-circuit 221 and the comparing sub-circuit 222, and is configured to generate the compensation data voltage according to the actual current difference after receiving the generation control signal.
In the embodiment of the present invention, the compensation data voltage generation circuit 22 may include a calculation sub-circuit 221, a comparison sub-circuit 222 and a compensation data voltage generation sub-circuit 223, the calculation sub-circuit is used for calculating the actual current difference, the comparison sub-circuit 222 is used for determining whether the pixel current has a large deviation, and the compensation data voltage generation sub-circuit 223 is used for generating the compensation data voltage according to the actual current difference when the comparison sub-circuit 222 determines that the pixel current has a large deviation.
According to a specific embodiment, the compensation circuit is configured to, during a compensation driving period, add an original data voltage provided by a data driving unit to the compensated data voltage when the (n + 1) th row of gate lines is turned on to obtain a compensated data voltage, and provide the compensated data voltage to the mth column of data lines.
In a specific implementation, in the compensation driving period, when the (n + 1) th row of gate lines is opened, the data driving unit included in the data driving circuit is configured to provide an original data voltage for the mth column of data lines, the compensation circuit adds the compensation data voltage to the original data voltage, and provides a voltage of compensated data obtained by adding the compensation data voltage to the mth column of data lines to perform data voltage compensation, so as to improve uniformity of display brightness.
In the embodiment of the present invention, each column of power voltage lines corresponds to a single pin on the power voltage supply chip, when the AMOLED display panel operates, the N rows of gate lines are opened row by row, and for the N sub-pixel circuits located in a certain column, each scan of one row of gate lines means that the luminance of one sub-pixel circuit changes (if the luminance change amount is 0 in the case of a static picture), and the current value on the column of power voltage lines also changes correspondingly.
Fig. 4 is a diagram showing a relationship between an ideal current value Ion _ vdd-s flowing through the corresponding column power supply voltage line and time t when the gate lines of each row are turned on in the detection driving period. In fig. 4, a time period when the gate line of the nth row is turned on is denoted by Sn, and a time period when the gate line of the (n + 1) th row is turned on is denoted by Sn +1, as can be seen from fig. 4, a current difference between an ideal current value flowing through the corresponding column power voltage line at Sn +1 and an ideal current value flowing through the corresponding column power voltage line at Sn is Δ I1, and Δ I1 is a predetermined current difference.
Fig. 5 is a diagram showing a relationship between a current value Ion _ vdd flowing through the corresponding column power supply voltage line and time t when each row gate line is turned on in the detection drive period. In fig. 5, reference sign Sn denotes a period during which the nth row gate line is turned on, and reference sign Sn +1 denotes a period during which the n +1 th row gate line is turned on. As can be seen from fig. 5, the current difference between the n +1 th current value flowing through the corresponding column power supply voltage line at Sn +1 and the n th current value flowing through the corresponding column power supply voltage line at Sn is Δ I2.
The difference between Δ I2 and Δ I1 is Δ I3, Δ I3 is Δ I2- Δ I1, and Δ I3 is the actual current difference, and when the absolute value of Δ I3 is greater than a predetermined deviation threshold Δ Ith (Δ Ith is positive), it means that the pixel current deviation of the sub-pixel circuit in the corresponding column of the n +1 th row is too large (which causes a large deviation between the luminance of the light-emitting element in the sub-pixel circuit and the design value), and compensation is required.
Fig. 6 is a schematic diagram showing the relationship between the gate-source voltage V of the driving transistor in the sub-pixel circuit of the corresponding column in the (n + 1) th row and the pixel current I flowing through the driving transistor. As shown in fig. 6, the compensation data voltage corresponding to the actual current difference Δ I3 is Δ V, which is a negative value when Δ I3 is greater than 0.
And in actual operation, if Δ I3 is less than 0, then Δ V is a positive value.
The driving compensation method is applied to a pixel circuit, the pixel circuit comprises N sub-pixel circuits located in an mth column, the N sub-pixel circuits are all connected with an mth column power voltage line, the N sub-pixel circuits are all connected with an mth column data line, m is a positive integer, and N is an integer greater than 1; the drive compensation method includes:
in the detection driving period, the current detection circuit detects an nth current value flowing through the mth column power voltage line when the nth row gate line is turned on, and detects an n +1 th current value flowing through the mth column power voltage line when the n +1 th row gate line is turned on; n is a positive integer less than or equal to N;
the compensation data voltage generation circuit calculates a current difference value between the n +1 th current value and the nth current value, calculates a difference value between the current difference value and a preset current difference value, determines the difference value as an actual current difference value, and generates a compensation data voltage according to the actual current difference value when the absolute value of the actual current difference value is greater than a preset deviation threshold value;
in a compensation driving period, when the (n + 1) th row of gate lines is opened, the compensation circuit compensates the data voltage on the m-th column of data lines according to the compensation data voltage.
The driving compensation method in the embodiment of the invention can determine the pixel points and the compensation amount to be compensated by monitoring the variable quantity of the real-time total current value on the power supply voltage line and comparing the variable quantity with the preset current variable quantity.
Specifically, the compensation data voltage generation circuit may include a calculation sub-circuit, a comparison sub-circuit, and a compensation data voltage generation sub-circuit;
the step of generating the compensation data voltage according to the actual current difference when the absolute value of the actual current difference is greater than the predetermined deviation threshold includes:
the calculation sub-circuit calculates a current difference value between the n +1 th current value and the nth current value, calculates a difference value between the current difference value and a preset current difference value, and determines the difference value as an actual current difference value;
the comparison sub-circuit compares the absolute value of the actual current difference with a predetermined deviation threshold, and sends a generation control signal to the compensation data voltage generation sub-circuit when the absolute value of the actual current difference is greater than the predetermined deviation threshold;
and the compensation data voltage generating sub-circuit generates the compensation data voltage according to the actual current difference after receiving the generation control signal.
In a specific implementation, in the compensation driving period, when the gate line in the (n + 1) th row is turned on, the step of compensating, by the compensation circuit, the data voltage on the data line in the m-th column according to the compensated data voltage may include:
in a compensation driving period, when the (n + 1) th row of gate lines is opened, the compensation circuit adds an original data voltage provided by the data driving unit to the compensation data voltage to obtain a compensated data voltage, and provides the compensated data voltage to the mth column of data lines.
Specifically, the driving compensation method according to the embodiment of the present invention may further include: when the actual current difference is larger than 0, the compensation data voltage generation circuit controls the compensation data voltage to be negative voltage;
when the actual current difference is smaller than 0, the compensation data voltage generation circuit controls the compensation data voltage to be a positive voltage.
In specific implementation, when the real-time current difference is greater than 0, it means that when the gate line of the (n + 1) th row is opened, the data voltage on the data line needs to be reduced, the (n + 1) th current value can be close to the ideal current value, and then the compensation data voltage needs to be less than 0.
For example, if the n +1 th current value is equal to 3A (ampere), the nth current value is equal to 1A, and the predetermined current difference is 1A, that is, the ideal current value is 2A when the gate line of the n +1 th row is opened, the current difference between the n +1 th current value and the nth current value is 2A, the actual current difference is 1A, and the actual current difference is greater than 0, if the n +1 th current value is close to the ideal current value and the data voltage needs to be reduced, the compensation data voltage needs to be less than 0.
And assuming that the n +1 th current value is equal to 2A (ampere), the n current value is equal to 3A, and the predetermined current difference is-2A, that is, the ideal current value is 1A when the gate line of the n +1 th row is opened, the current difference between the n +1 th current value and the n current value is-1A, the actual current difference is 1A, and at this time, the actual current difference is greater than 0, if the n +1 th current value is close to the ideal current value, and the data voltage needs to be reduced, the compensation data voltage needs to be less than 0.
In specific implementation, when the real-time current difference is smaller than 0, it means that when the (n + 1) th row of gate lines is opened, the data voltage on the data lines needs to be boosted, the (n + 1) th current value can be close to the ideal current value, and then the compensation data voltage needs to be larger than 0.
For example, if the n +1 th current value is equal to 2A (ampere), the nth current value is equal to 1A, and the predetermined current difference is 2A, that is, the ideal current value is 3A when the gate line of the n +1 th row is opened, the current difference between the n +1 th current value and the nth current value is 1A, the actual current difference is-1A, and the actual current difference is smaller than 0, then if the n +1 th current value is close to the ideal current value, and the data voltage needs to be boosted, the compensation data voltage needs to be larger than 0.
And assuming that the n +1 current value is equal to 1A (ampere), the n current value is equal to 3A, the predetermined current difference is-1A, that is, the ideal current value is 2A when the gate line of the n +1 row is opened, the current difference between the n +1 current value and the n current value is-2A, the actual current difference is-1A, and at this time, the actual current difference is less than 0, if the n +1 current value is close to the ideal current value, and the data voltage needs to be boosted, the compensation data voltage needs to be greater than 0.
The display device according to the embodiment of the invention comprises the driving compensation unit.
Specifically, the display device may further include a display panel, a data driving circuit, and a power supply voltage control circuit; the display panel comprises a display substrate, M pixel circuits, M rows of power supply voltage lines, M rows of data lines and N rows of grid lines; the M pixel circuits, the M columns of power supply voltage lines, the M columns of data lines and the N rows of grid lines are all arranged on the display substrate; m and N are both positive integers; m is a positive integer less than or equal to M, N is a positive integer less than or equal to N;
the m-th pixel circuit includes N sub-pixel circuits located in the m-th column; the N sub-pixel circuits positioned in the mth column are all connected with an mth column power supply voltage line, and the N sub-pixel circuits positioned in the mth column are all connected with an mth column data line;
the data driving circuit comprises a data driving unit for providing original data voltages respectively corresponding to the M columns of data lines;
the compensation circuit included in the driving compensation unit is disposed in the data driving circuit.
In actual operation, the data driving circuit may be a data driving chip, the power supply voltage control circuit may be a power supply voltage supplying chip, and the data driving chip and the power supply voltage supplying chip are independent of each other.
As shown in fig. 7, reference numeral 70 is a display substrate, reference numeral 71 is a data driving chip, reference numeral 72 is a power supply voltage supplying chip, and fig. 7 schematically depicts four power supply voltage lines: the first, second, third and fourth column supply voltage lines VDL1, VDL2, VDL3, VDL4 are drawn schematically in fig. 7 except for the four data lines: a first column data line DL1, a second column data line DL2, a third column data line DL3 and a fourth column data line DL 4; the VDL1 is connected to a first pin of the power supply chip 72, the VDL2 is connected to a second pin of the power supply chip 72, the VDL3 is connected to a third pin of the power supply chip 72, and the VDL4 is connected to a fourth pin of the power supply chip 72; DL1 is connected to the first pin of the data driving chip 71, DL2 is connected to the second pin of the data driving chip 71, DL3 is connected to the third pin of the data driving chip 71, and DL4 is connected to the fourth pin of the data driving chip 71.
In the embodiment of the present invention, the m-th column power voltage line is connected to all the N sub-pixel circuits in the m-th column included in the m-th pixel circuit, and the data voltage on the m-th column data line may be adjusted according to the current value on the m-th column power voltage line, so as to improve the display accuracy.
In order to reduce the complexity of the driving compensation circuit as much as possible and simultaneously consider that the main factors influencing the luminance of the light-emitting elements in the sub-pixel circuits do not change rapidly in a short time, the detection-compensation process in the technical scheme of the invention does not need to be carried out on each column of sub-pixel circuits at the same time in each frame of picture display time, and can be implemented at intervals staggered according to actual needs. For example, the operations of detecting and calculating the compensation data voltages for the first column of sub-pixel circuits are performed during the first frame display time, the operations of detecting and calculating the compensation data voltages for the second column of sub-pixel circuits are performed during the tenth frame display time, and so on.
In a preferred case, the data driving circuit and the power supply voltage control circuit may be provided in the same integrated circuit.
As shown in fig. 8, reference numeral 70 denotes a display substrate, reference numeral 81 denotes a driving integrated circuit, and the data driving circuit and the power supply voltage control circuit are integrated in the driving integrated circuit 81; four supply voltage lines are schematically drawn in fig. 8: the first, second, third and fourth column supply voltage lines VDL1, VDL2, VDL3, VDL4 are drawn schematically in fig. 7 except for the four data lines: a first column data line DL1, a second column data line DL2, a third column data line DL3 and a fourth column data line DL 4; the VDL1 is connected to a first pin of the driving integrated circuit 81, the VDL2 is connected to a second pin of the driving integrated circuit 81, the VDL3 is connected to a third pin of the driving integrated circuit 81, and the VDL4 is connected to a fourth pin of the driving integrated circuit 81; DL1 is connected to the fifth pin of the driving integrated circuit 81, DL2 is connected to the sixth pin of the driving integrated circuit 81, DL3 is connected to the seventh pin of the driving integrated circuit 81, and DL4 is connected to the eighth pin of the driving integrated circuit 81.
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 (10)
1. A driving compensation unit is applied to a pixel circuit, the pixel circuit comprises N sub-pixel circuits located in an m-th column, the N sub-pixel circuits are all connected with a power voltage line of the m-th column, the N sub-pixel circuits are all connected with a data line of the m-th column, m is a positive integer, and N is an integer greater than 1; characterized in that the drive compensation unit comprises a current detection circuit, a compensation data voltage generation circuit and a compensation circuit, wherein,
the current detection circuit is used for detecting an nth current value flowing through the mth column power voltage line when the nth row grid line is opened and detecting an n +1 th current value flowing through the mth column power voltage line when the (n + 1) th row grid line is opened in a detection driving period; n is a positive integer less than or equal to N;
the compensation data voltage generating circuit is used for calculating a current difference value between the n +1 th current value and the nth current value, calculating a difference value between the current difference value and a preset current difference value, determining the difference value as an actual current difference value, and generating a compensation data voltage according to the actual current difference value when the absolute value of the actual current difference value is greater than a preset deviation threshold value;
the compensation circuit is used for compensating the data voltage on the mth column data line according to the compensation data voltage in a compensation driving period when the (n + 1) th row of grid lines is opened.
2. The drive compensation unit of claim 1, wherein the compensation data voltage generation circuit comprises a calculation sub-circuit, a comparison sub-circuit, and a compensation data voltage generation sub-circuit, wherein,
the calculating sub-circuit is connected with the current detection circuit and is used for calculating a current difference value between the n +1 th current value and the nth current value, calculating a difference value between the current difference value and a preset current difference value and determining the difference value as an actual current difference value;
the comparison sub-circuit is connected with the calculation sub-circuit and used for comparing the absolute value of the actual current difference with a preset deviation threshold value and sending a generation control signal to the compensation data voltage generation sub-circuit when the absolute value of the actual current difference is larger than the preset deviation threshold value;
and the compensation data voltage generating sub-circuit is respectively connected with the calculating sub-circuit and the comparing sub-circuit and is used for generating the compensation data voltage according to the actual current difference after receiving the generation control signal.
3. The driving compensation unit of claim 1 or 2, wherein the compensation circuit is configured to add an original data voltage provided by the data driving unit to the compensated data voltage to obtain a compensated data voltage when the (n + 1) th row gate line is turned on during a compensation driving period, and provide the compensated data voltage to the mth column data line.
4. A driving compensation method is applied to a pixel circuit, the pixel circuit comprises N sub-pixel circuits located in an m-th column, the N sub-pixel circuits are all connected with a power voltage line of the m-th column, the N sub-pixel circuits are all connected with a data line of the m-th column, m is a positive integer, and N is an integer greater than 1; characterized in that the drive compensation method comprises:
in the detection driving period, the current detection circuit detects an nth current value flowing through the mth column power voltage line when the nth row gate line is turned on, and detects an n +1 th current value flowing through the mth column power voltage line when the n +1 th row gate line is turned on; n is a positive integer less than or equal to N;
the compensation data voltage generation circuit calculates a current difference value between the n +1 th current value and the nth current value, calculates a difference value between the current difference value and a preset current difference value, determines the difference value as an actual current difference value, and generates a compensation data voltage according to the actual current difference value when the absolute value of the actual current difference value is greater than a preset deviation threshold value;
in the compensation driving period, when the (n + 1) th row of grid lines is opened, the compensation circuit compensates the data voltage on the mth column of data lines according to the compensation data voltage.
5. The drive compensation method according to claim 4, wherein the compensation data voltage generation circuit includes a calculation sub-circuit, a comparison sub-circuit, and a compensation data voltage generation sub-circuit;
the step of generating the compensation data voltage according to the actual current difference when the absolute value of the actual current difference is greater than the predetermined deviation threshold includes:
the calculation sub-circuit calculates a current difference value between the n +1 th current value and the nth current value, calculates a difference value between the current difference value and a preset current difference value, and determines the difference value as an actual current difference value;
the comparison sub-circuit compares the absolute value of the actual current difference with a predetermined deviation threshold, and sends a generation control signal to the compensation data voltage generation sub-circuit when the absolute value of the actual current difference is greater than the predetermined deviation threshold;
and the compensation data voltage generating sub-circuit generates the compensation data voltage according to the actual current difference after receiving the generation control signal.
6. The driving compensation method as claimed in claim 4 or 5, wherein the compensating circuit compensates the data voltage on the m-th column data line according to the compensated data voltage when the (n + 1) -th row gate line is turned on during the compensation driving period, comprising:
in a compensation driving period, when the (n + 1) th row of gate lines is opened, the compensation circuit adds an original data voltage provided by the data driving unit to the compensation data voltage to obtain a compensated data voltage, and provides the compensated data voltage to the mth column of data lines.
7. The drive compensation method of claim 6, further comprising: when the actual current difference is larger than 0, the compensation data voltage generation circuit controls the compensation data voltage to be negative voltage;
when the actual current difference is smaller than 0, the compensation data voltage generation circuit controls the compensation data voltage to be a positive voltage.
8. A display device comprising the drive compensation unit according to any one of claims 1 to 3.
9. The display device according to claim 8, wherein the display device further comprises a display panel, a data driving circuit, and a power supply voltage control circuit; the display panel comprises a display substrate, M pixel circuits, M rows of power supply voltage lines, M rows of data lines and N rows of grid lines; the M pixel circuits, the M columns of power supply voltage lines, the M columns of data lines and the N rows of grid lines are all arranged on the display substrate; m and N are both positive integers; m is a positive integer less than or equal to M, N is a positive integer less than or equal to N;
the m-th pixel circuit includes N sub-pixel circuits located in the m-th column; the N sub-pixel circuits positioned in the mth column are all connected with an mth column power supply voltage line, and the N sub-pixel circuits positioned in the mth column are all connected with an mth column data line;
the data driving circuit comprises a data driving unit for providing original data voltages respectively corresponding to the M columns of data lines;
the compensation circuit included in the driving compensation unit is disposed in the data driving circuit.
10. The display device according to claim 9, wherein the data driving circuit and the power supply voltage control circuit are provided in the same integrated circuit.
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