CN109272941A - Drive compensating unit, driving compensation method and display device - Google Patents
Drive compensating unit, driving compensation method and display device Download PDFInfo
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- CN109272941A CN109272941A CN201811494699.6A CN201811494699A CN109272941A CN 109272941 A CN109272941 A CN 109272941A CN 201811494699 A CN201811494699 A CN 201811494699A CN 109272941 A CN109272941 A CN 109272941A
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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]
- G09G3/3275—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
Abstract
The present invention provides a kind of driving compensating unit, driving compensation method and display device.Driving compensating unit includes current detection circuit, offset data voltage generation circuit and compensation circuit；Current detection circuit is used to detect the n-th current value, and detect the (n+1)th current value in detection drive cycle；N is the positive integer less than or equal to N, and N is the integer greater than 1；Offset data voltage generation circuit is for generating offset data voltage；Compensation circuit is used to, when the (n+1)th row grid line is opened, compensate the data voltage on corresponding column data line according to the offset data voltage in compensation drive cycle.The present invention can be made in guarantee or reduce the design complexities of the pixel-driving circuit in the effective display area of display panel under the premise of promoting display picture quality, and the embodiment of the present invention can not only compensate the offset of the pixel current due to caused by the threshold value electric drift of transistor, also can compensate for the offset of the pixel current as caused by other techniques.
Description
Technical field
The present invention relates to display actuation techniques field more particularly to a kind of driving compensating unit, driving compensation method and show
Showing device.
Background technique
Since Organic Light Emitting Diode is electric current driving display device, AMOLED (Active-matrix organic
Light-emitting diode, active matrix organic light-emitting diode) homogeneity of electric current will directly affect in display panel
The homogeneity of display brightness, any factor for causing current deviation will all significantly affect the display effect of AMOLED display panel.
As shown in Figure 1, existing 2T1C pixel-driving circuit includes driving transistor T2, data writing transistor T and deposits
Storage holds Cst, and T2 drives Organic Light Emitting Diode OLED to shine.In Fig. 1, Data is data line, and Gate is grid line, and VDD is
Supply voltage, VSS are low-voltage.T2 drives the driving current Ion of OLED related with the threshold voltage of T2, in order to carry out threshold value electricity
Pressure compensation, in the prior art, it will usually increase transistor on the basis of 2T1C pixel-driving circuit, be opened so as to cause pixel
Mouth rate reduces.Also, only carry out threshold compensation and be not also able to satisfy AMOLED to show requirement to electric current homogeneity, process deviation
(such as breadth length ratio deviation of insulating layer film thickness ununiformity one, transistor etc.) can also cause electric current misalignment.
Summary of the invention
The main purpose of the present invention is to provide a kind of driving compensating unit, driving compensation method and display devices, solve
The prior art carrying out display driving compensation when, the pixel aperture ratio of the effective display area of display panel is low, can not compensate because
Caused by process deviation the problem of electric current misalignment.
In order to achieve the above object, the present invention provides a kind of driving compensating units, are applied to pixel circuit, the pixel
Circuit includes N number of sub-pixel circuits positioned at m column, and N number of sub-pixel circuits are all connect with m column power voltage line, institute
It states N number of sub-pixel circuits all to connect with m column data line, m is positive integer, and N is the integer greater than 1；The driving compensating unit
Including current detection circuit, offset data voltage generation circuit and compensation circuit, wherein
The current detection circuit is used in detection drive cycle, and detection flows through the m column when line n grid line is opened
N-th current value of power voltage line, and detect and flow through the (n+1)th of the m column power voltage line when the (n+1)th row grid line is opened
Current value；N is the positive integer less than or equal to N；
The offset data voltage generation circuit is for calculating between (n+1)th current value and n-th current value
Current differential, and the difference between the current differential and scheduled current difference is calculated, determine that the difference is actual current difference, when
When the absolute value of the actual current difference is greater than target offset threshold value, offset data voltage is generated according to the actual current difference；
The compensation circuit is used in compensation drive cycle, when the (n+1)th row grid line is opened, according to the compensation number
The data voltage on the m column data line is compensated according to voltage.
When implementation, the offset data voltage generation circuit includes calculating sub-circuit, comparing sub-circuit and offset data electricity
Pressure generates sub-circuit, wherein
The calculating sub-circuit is connect with the current detection circuit, for calculating (n+1)th current value and described n-th
Current differential between current value, and the difference between the current differential and scheduled current difference is calculated, determine that the difference is real
Border current differential；
The relatively sub-circuit is connect with the calculatings sub-circuit, for compare the absolute value of the actual current difference in advance
Deviation threshold is determined, and when the absolute value of the actual current difference is greater than the target offset threshold value, to the offset data
Voltage generates sub-circuit and sends generation control signal；
The offset data voltage generate sub-circuit respectively with the calculatings sub-circuit and it is described relatively sub-circuit connection, use
In after receiving the generation control signal, the offset data voltage is generated according to the actual current difference.
When implementation, the compensation circuit is used in compensation drive cycle, when the (n+1)th row grid line is opened, by data
The initial data voltage that driving unit provides is added with the offset data voltage, with data voltage after being compensated, and by institute
Data voltage is provided to the m column data line after stating compensation.
The present invention also provides a kind of driving compensation methodes, are applied to pixel circuit, and the pixel circuit includes being located at m
N number of sub-pixel circuits of column, N number of sub-pixel circuits are all connect with m column power voltage line, N number of sub-pixel circuits
It is all connect with m column data line, m is positive integer, and N is the integer greater than 1；The driving compensation method includes:
In detection drive cycle, current detection circuit detection flows through the m column supply voltage when line n grid line is opened
N-th current value of line, and detect the (n+1)th current value that the m column power voltage line is flowed through when the (n+1)th row grid line is opened；n
For the positive integer less than or equal to N；
Offset data voltage generation circuit calculates the current differential between (n+1)th current value and n-th current value,
And the difference between the current differential and scheduled current difference is calculated, determine that the difference is actual current difference, when the practical electricity
When flowing the absolute value of difference greater than target offset threshold value, offset data voltage is generated according to the actual current difference；
In compensation drive cycle, when the (n+1)th row grid line is opened, the compensation circuit is according to the offset data electricity
Pressure compensates the data voltage on the m column data line.
When implementation, the offset data voltage generation circuit includes calculating sub-circuit, comparing sub-circuit and offset data electricity
Pressure generates sub-circuit；
The offset data voltage generation circuit calculates the electric current between (n+1)th current value and n-th current value
Difference, and the difference between the current differential and scheduled current difference is calculated, determine that the difference is actual current difference, when the reality
When the absolute value of border current differential is greater than target offset threshold value, offset data voltage steps packet is generated according to the actual current difference
It includes:
The calculating sub-circuit calculates the current differential between (n+1)th current value and n-th current value, and calculates
Difference between the current differential and scheduled current difference determines that the difference is actual current difference；
The relatively sub-circuit compares the absolute value and target offset threshold value of the actual current difference, and when the practical electricity
When flowing the absolute value of difference greater than the target offset threshold value, sub-circuit is generated to the offset data voltage and sends generation control
Signal；
The offset data voltage generates sub-circuit after receiving the generation control signal, according to the actual current
Difference generates the offset data voltage.
When implementation, described in compensation drive cycle, when the (n+1)th row grid line is opened, the compensation circuit is according to institute
It states offset data voltage step is compensated to the data voltage on the m column data line and include:
In compensation drive cycle, when the (n+1)th row grid line is opened, the compensation circuit provides data drive unit
Initial data voltage be added with the offset data voltage, with data voltage after being compensated, and by data after the compensation
Voltage is provided to the m column data line.
When implementation, driving compensation method of the present invention further include: described when the actual current difference is greater than 0
It is negative voltage that offset data voltage generation circuit, which controls the offset data voltage,；
When the actual current difference is less than 0, the offset data voltage generation circuit controls the offset data electricity
Pressure is positive voltage.
The present invention also provides a kind of display devices, including above-mentioned driving compensating unit.
When implementation, the display device further includes display panel, data drive circuit and source voltage control circuit；It is described
Display panel includes display base plate, M pixel circuit, M column power voltage line, M column data line and N row grid line；The M pixel
Circuit, the M column power voltage line, the M column data line and the N row grid line are all set on the display base plate；M and N
It is all positive integer；M is the positive integer less than or equal to M, and n is the positive integer less than or equal to N；
M-th of pixel circuit includes N number of sub-pixel circuits positioned at m column；The N number of sub-pixel electricity for being located at m column
The connection of Lu Douyu m column power voltage line, the N number of sub-pixel circuits for being located at m column are all connect with m column data line；
The data drive circuit includes driving for providing the data of initial data voltage corresponding with M column data line respectively
Moving cell；
The compensation circuit that the driving compensating unit includes is set in the data drive circuit.
When implementation, the data drive circuit and the source voltage control circuit are set in same integrated circuit.
Compared with prior art, driving compensating unit described in the embodiment of the present invention, driving compensation method and display device
The pixel-driving circuit in the area AA for reducing display panel under the premise of guaranteeing or promoting AMOLED display picture quality is set
Complexity is counted, to significantly improve the aperture opening ratio and reliability of AMOLED display panel, and the embodiment of the present invention can not only mend
Pixel current deviates caused by repaying the threshold voltage vt h drift due to transistor, also can compensate for as caused by other techniques
Pixel current offset.
Detailed description of the invention
Fig. 1 is the circuit diagram of existing 2T1C pixel-driving circuit；
Fig. 2 is the structure chart that compensating unit is driven described in the embodiment of the present invention；
Fig. 3 is the structure chart that compensating unit is driven described in another embodiment of the present invention；
Fig. 4 is to flow through the desired current level of respective column power voltage line when each row grid line is opened in detection drive cycle
Relation schematic diagram between Ion_vdd-s and time t；
Fig. 5 is to flow through the current value Ion_ of respective column power voltage line when each row grid line is opened in detection drive cycle
Relation schematic diagram between vdd and time t；
Fig. 6 is the gate source voltage V of the driving transistor in the sub-pixel circuits of the (n+1)th row respective column and flows through the drive
Relation schematic diagram between the pixel current I of dynamic transistor；
Fig. 7 is display panel, data driving chip and the power supply electricity that display device described in the embodiment of the present invention includes
The structural relation schematic diagram of pressure supply chip；
Fig. 8 is the structural relation of the display panel that display device described in the embodiment of the present invention includes and drive integrated circult
Schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The transistor used in all embodiments of the invention all can be triode, thin film transistor (TFT) or field-effect tube or its
The identical device of his characteristic.In embodiments of the present invention, to distinguish the two poles of the earth of transistor in addition to control electrode, will wherein claim a pole
For the first pole, another pole is known as the second pole.
In practical operation, when the transistor is triode, the control electrode can be base stage, and first pole can
Think collector, second pole can be with emitter；Alternatively, the control electrode can be base stage, described first can be extremely hair
Emitter-base bandgap grading, second pole can be with collector.
In practical operation, when the transistor is thin film transistor (TFT) or field-effect tube, the control electrode can be grid
Pole, described first can be extremely drain electrode, and described second extremely can be source electrode；Alternatively, the control electrode can be grid, described the
One extremely can be source electrode, and described second can be extremely drain electrode.
Driving compensating unit described in the embodiment of the present invention, is applied to pixel circuit, and the pixel circuit includes being located at m
N number of sub-pixel circuits of column, N number of sub-pixel circuits are all connect with m column power voltage line, N number of sub-pixel circuits
It is all connect with m column data line, m is positive integer, and N is the integer greater than 1；As shown in Fig. 2, the driving compensating unit includes electricity
Current detection circuit 21, offset data voltage generation circuit 22 and compensation circuit 23, wherein
The current detection circuit 21 is used in detection drive cycle, and detection flows through the m when line n grid line is opened
N-th current value of column power voltage line, and detect and flow through the n-th of the m column power voltage line when the (n+1)th row grid line is opened
+ 1 current value；N is the positive integer less than or equal to N；
The offset data voltage generation circuit 22 is connect with the current detection circuit 21, for calculating described (n+1)th
Current differential between current value and n-th current value, and the difference between the current differential and scheduled current difference is calculated,
Determine that the difference is actual current difference, when the absolute value of the actual current difference is greater than target offset threshold value, according to the reality
Border current differential generates offset data voltage；
The compensation circuit 23 is connect with the offset data voltage generation circuit 22, for compensating drive cycle, when
When the (n+1)th row grid line is opened, the data voltage on the m column data line is mended according to the offset data voltage
It repays.
In practical operation, in detection drive cycle, the period opened to the (n+1)th row grid line is opened in line n grid line
Interior, the current value for flowing through m column power voltage line can become larger, at this time between (n+1)th current value and n-th current value
Current differential be positive value, the scheduled current difference is also positive value；Alternatively, flowing through the current value of m column power voltage line
It can become smaller, the current differential between (n+1)th current value and n-th current value is negative value, the scheduled current at this time
Difference is also positive value.Also, when the current differential is greater than the scheduled current difference, the actual current difference is greater than 0,
When the current differential is less than the scheduled current difference, the actual current difference is less than 0.
In the specific implementation, the scheduled current difference can be calculated according to the actual situation.Do not considering transistor
Threshold voltage shift in the case where, for specification determine light-emitting component (light-emitting component for example can be organic light emission
Diode), when which shines, flows through its current value and be provided to the number of the sub-pixel circuits including the light-emitting component
According to the one-to-one relationship of existence anduniquess between voltage, thus can according to line n grid line open when be provided to m column data line
The n-th data voltage, difference between the (n+1)th data voltage of m column data line is provided to when opening with the (n+1)th row grid line,
The scheduled current difference is calculated.
In the specific implementation, the target offset threshold value can be selected according to the actual situation, when the actual current difference
Absolute value be greater than the target offset threshold value when, then determine need to carry out data voltage compensation.
In practical operation, the compensation drive cycle is set to after the detection drive cycle；For example, working as the benefit
When to repay drive cycle be first frame picture display time, the detection drive cycle can be the second frame picture display time to the
20 frame picture display times, alternatively, the detection drive cycle may be the 4th frame picture display time to the 20th frame
Picture display time；Next compensation drive cycle can be the 1 11 frame picture display time.
In embodiments of the present invention, display panel includes display base plate, and N row M column being set on display base plate
Pixel circuit, N number of sub-pixel circuits positioned at m column form a pixel circuit, are position by an individual power voltage line
Supply voltage is provided in N number of sub-pixel circuits of m column, the embodiment of the present invention passes through the real-time current on monitoring power voltage line
The variable quantity of value, and the variable quantity and scheduled current variable quantity are compared, it can determine that needs compensated in conjunction with timing Design
Pixel and compensation rate, the embodiment of the present invention simplify the picture in AA (Active Area is effectively shown) area of display panel
The structure of plain driving circuit promotes aperture opening ratio, reliability and the accuracy of display panel.
In using the display device of driving compensating unit described in the embodiment of the present invention, in the area AA of display panel
The structure of pixel-driving circuit can be fairly simple, does not need to use multiple transistors to carry out threshold voltage compensation, Neng Gouti
Rise the aperture opening ratio of display panel.
In practical operation, the display panel can be AMOLED (Active-matrix organic light-
Emitting diode, active matrix organic light-emitting diode) display panel, but not limited to this.
The embodiment of the present invention for the pixel-driving circuit design in AMOLED display panel it is complicated (transistor of use
Number and the number of capacitor are more) and ineffective (existing pixel-driving circuit is only for a certain principal element, such as crystal
The threshold voltage vt h of pipe, and ignore the inhomogenous situation of display brightness caused by other techniques), provide a kind of driving compensation
Unit, the pixel-driving circuit in the area AA for reducing display panel under the premise of guaranteeing or promoting AMOLED display picture quality
Design complexities, to significantly improve the aperture opening ratio and reliability of AMOLED display panel.
Driving compensating unit described in the embodiment of the present invention can not only compensate the threshold voltage vt h drift due to transistor
Caused pixel current offset, also can compensate for the offset of the pixel current as caused by other techniques.
Specifically, as shown in figure 3, on the basis of the embodiment of driving compensating unit shown in Fig. 2, the offset data
Voltage generation circuit 22 includes calculating sub-circuit 221, comparing sub-circuit 222 and offset data voltage generation sub-circuit 223,
In,
The calculating sub-circuit 221 is connect with the current detection circuit 21, for calculating (n+1)th current value and institute
The current differential between the n-th current value is stated, and calculates the difference between the current differential and scheduled current difference, determines the difference
For actual current difference；
The relatively sub-circuit 222 is connect with the calculating sub-circuit 221, for comparing the absolute of the actual current difference
Value and target offset threshold value, and when the absolute value of the actual current difference is greater than the target offset threshold value, to the benefit
It repays data voltage and generates the transmission generation control signal of sub-circuit 223；
The offset data voltage generate sub-circuit 223 respectively with the calculating sub-circuit 221 and it is described compared with sub-circuit
222 connections, for generating the offset data electricity according to the actual current difference after receiving the generation control signal
Pressure.
In embodiments of the present invention, the offset data voltage generation circuit 22 may include calculating sub-circuit 221, comparing
Sub-circuit 222 and offset data voltage generate sub-circuit 223, calculate sub-circuit for calculating actual current difference, the comparison
For determining pixel current with the presence or absence of relatively large deviation, the offset data voltage generates sub-circuit 223 and is used for sub-circuit 222
The relatively sub-circuit 222 determines that pixel current there are when relatively large deviation, generates offset data voltage according to actual current difference.
According to a kind of specific embodiment, the compensation circuit is used in compensation drive cycle, when the (n+1)th row grid line
When opening, the initial data voltage that data drive unit provides is added with the offset data voltage, with number after being compensated
The m column data line is provided to according to voltage, and by data voltage after the compensation.
In the specific implementation, in compensation drive cycle, when the (n+1)th row grid line is opened, number that data drive circuit includes
Be used to provide initial data voltage for m column data line according to driving unit, compensation circuit by the offset data voltage with it is described
Initial data voltage is added, and the voltage of data is provided to m column data line after the compensation that will add up, to carry out data electricity
Pressure compensation, to promote display brightness homogeneity.
In embodiments of the present invention, each column power voltage line all corresponds to one that supply voltage is supplied on chip individually
Pin, when AMOLED display panel work when, N row grid line is opened line by line, for be located at a certain column N number of sub-pixel circuits come
It says, every scanning a line grid line then means have the brightness of a sub-pixel circuits that variation has occurred (if tableaux then brightness
Variable quantity is that 0), the current value on the column power voltage line can also generate variation accordingly.
Fig. 4 is to flow through the desired current level of respective column power voltage line when each row grid line is opened in detection drive cycle
Relation schematic diagram between Ion_vdd-s and time t.In Fig. 4, label Sn is the period that line n grid line is opened, label
It is the period that the (n+1)th row grid line is opened to flow through the ideal of respective column power voltage line in Sn+1 as shown in Figure 4 for Sn+1
Current value and the current differential between the desired current level that Sn flows through respective column power voltage line are Δ I1, and Δ I1 is predetermined
Current differential.
Fig. 5 is to flow through the current value Ion_ of respective column power voltage line when each row grid line is opened in detection drive cycle
Relation schematic diagram between vdd and time t.In Fig. 5, label Sn is the period that line n grid line is opened, marked as Sn+1
It is the period that the (n+1)th row grid line is opened.As shown in Figure 5, the (n+1)th current value of respective column power voltage line is flowed through in Sn+1
It is Δ I2 with the current differential between the n-th current value that Sn flows through respective column power voltage line.
The difference of Δ I2 and Δ I1 is Δ I3, and Δ I3=Δ I2- Δ I1, Δ I3 are actual current difference, when Δ I3's
When absolute value is greater than target offset threshold value Δ Ith (Δ Ith is positive), it is meant that positioned at the sub-pixel circuits of the (n+1)th row respective column
Pixel current deviation it is excessive (cause the brightness of the light-emitting component in the sub-pixel circuits and design value have relatively large deviation), need
It compensates.
Fig. 6 is the gate source voltage V of the driving transistor in the sub-pixel circuits of the (n+1)th row respective column and flows through the drive
Relation schematic diagram between the pixel current I of dynamic transistor.As shown in fig. 6, corresponding to the compensation number of actual current difference DELTA I3
It is Δ V according to voltage, when Δ I3 is greater than 0, Δ V is negative value.
And in practical operation, if Δ I3, less than 0, Δ V is that negative value is positive value.
Driving compensation method described in the embodiment of the present invention, is applied to pixel circuit, and the pixel circuit includes being located at m
N number of sub-pixel circuits of column, N number of sub-pixel circuits are all connect with m column power voltage line, N number of sub-pixel circuits
It is all connect with m column data line, m is positive integer, and N is the integer greater than 1；The driving compensation method includes:
In detection drive cycle, current detection circuit detection flows through the m column supply voltage when line n grid line is opened
N-th current value of line, and detect the (n+1)th current value that the m column power voltage line is flowed through when the (n+1)th row grid line is opened；n
For the positive integer less than or equal to N；
Offset data voltage generation circuit calculates the current differential between (n+1)th current value and n-th current value,
And the difference between the current differential and scheduled current difference is calculated, determine that the difference is actual current difference, when the practical electricity
When flowing the absolute value of difference greater than target offset threshold value, offset data voltage is generated according to the actual current difference；
In compensation drive cycle, when the (n+1)th row grid line is opened, the compensation circuit is according to the offset data electricity
Pressure compensates the data voltage on the m column data line.
The change that driving compensation method described in the embodiment of the present invention passes through the real-time total current value on monitoring power voltage line
Change amount, and the variable quantity and scheduled current variable quantity are compared, it may be determined that the pixel and compensation rate for needing to compensate out, this hair
Bright embodiment simplifies the structure of the pixel-driving circuit in the area AA of display panel, promotes the aperture opening ratio, reliable of display panel
Property and accuracy.
Specifically, the offset data voltage generation circuit may include calculating sub-circuit, comparing sub-circuit and compensation number
Sub-circuit is generated according to voltage；
The offset data voltage generation circuit calculates the electric current between (n+1)th current value and n-th current value
Difference, and the difference between the current differential and scheduled current difference is calculated, determine that the difference is actual current difference, when the reality
When the absolute value of border current differential is greater than target offset threshold value, offset data voltage steps packet is generated according to the actual current difference
It includes:
The calculating sub-circuit calculates the current differential between (n+1)th current value and n-th current value, and calculates
Difference between the current differential and scheduled current difference determines that the difference is actual current difference；
The relatively sub-circuit compares the absolute value and target offset threshold value of the actual current difference, and when the practical electricity
When flowing the absolute value of difference greater than the target offset threshold value, sub-circuit is generated to the offset data voltage and sends generation control
Signal；
The offset data voltage generates sub-circuit after receiving the generation control signal, according to the actual current
Difference generates the offset data voltage.
In the specific implementation, described in compensation drive cycle, when the (n+1)th row grid line is opened, the compensation circuit
Compensating step to the data voltage on the m column data line according to the offset data voltage may include:
In compensation drive cycle, when the (n+1)th row grid line is opened, the compensation circuit provides data drive unit
Initial data voltage be added with the offset data voltage, with data voltage after being compensated, and by data after the compensation
Voltage is provided to the m column data line.
Specifically, driving compensation method described in the embodiment of the present invention can also include: when the actual current difference is big
When 0, it is negative voltage that the offset data voltage generation circuit, which controls the offset data voltage,；
When the actual current difference is less than 0, the offset data voltage generation circuit controls the offset data electricity
Pressure is positive voltage.
In the specific implementation, when real-time current difference is greater than 0, it is meant that when the (n+1)th row grid line is opened, need to count
It is reduced according to the data voltage on line, the (n+1)th current value could be close to desired current level, then offset data voltage needs to be less than 0.
As an example it is assumed that the (n+1)th current value is equal to 3A (ampere), the n-th current value is equal to 1A, and scheduled current difference is
Desired current level is 2A when 1A namely the (n+1)th row grid line are opened, then the current differential between the (n+1)th current value and the n-th current value
For 2A, actual current difference is 1A, and actual current difference is greater than 0 at this time, if then thinking so that the (n+1)th current value is close to ideal current
Value, needs to reduce data voltage, then offset data voltage needs to be less than 0.
And assume that the (n+1)th current value is equal to 2A (ampere), the n-th current value is equal to 3A, and scheduled current difference is -2A, namely
Desired current level is 1A when (n+1)th row grid line is opened, then the current differential between the (n+1)th current value and the n-th current value is -1A,
Actual current difference is 1A, and actual current difference is greater than 0 at this time, if then thinking so that the (n+1)th current value is needed close to desired current level
Data voltage is reduced, then offset data voltage needs to be less than 0.
In the specific implementation, when real-time current difference is less than 0, it is meant that when the (n+1)th row grid line is opened, need to count
It is promoted according to the data voltage on line, the (n+1)th current value could be close to desired current level, then offset data voltage needs to be greater than 0.
As an example it is assumed that the (n+1)th current value is equal to 2A (ampere), the n-th current value is equal to 1A, and scheduled current difference is
Desired current level is 3A when 2A namely the (n+1)th row grid line are opened, then the current differential between the (n+1)th current value and the n-th current value
For 1A, actual current difference is -1A, and actual current difference is less than 0 at this time, if then thinking so that the (n+1)th current value is close to desired electrical
Flow valuve needs to be promoted data voltage, then offset data voltage needs to be greater than 0.
And assume that the (n+1)th current value is equal to 1A (ampere), the n-th current value is equal to 3A, and scheduled current difference is -1A, namely
Desired current level is 2A when (n+1)th row grid line is opened, then the current differential between the (n+1)th current value and the n-th current value is -2A,
Actual current difference is -1A, and actual current difference is less than 0 at this time, if then thinking so that the (n+1)th current value is close to desired current level,
Need to be promoted data voltage, then offset data voltage needs to be greater than 0.
Display device described in the embodiment of the present invention includes above-mentioned driving compensating unit.
Specifically, the display device can also include display panel, data drive circuit and source voltage control circuit；
The display panel includes display base plate, M pixel circuit, M column power voltage line, M column data line and N row grid line；The M
Pixel circuit, the M column power voltage line, the M column data line and the N row grid line are all set on the display base plate；M
It is all positive integer with N；M is the positive integer less than or equal to M, and n is the positive integer less than or equal to N；
M-th of pixel circuit includes N number of sub-pixel circuits positioned at m column；The N number of sub-pixel electricity for being located at m column
The connection of Lu Douyu m column power voltage line, the N number of sub-pixel circuits for being located at m column are all connect with m column data line；
The data drive circuit includes driving for providing the data of initial data voltage corresponding with M column data line respectively
Moving cell；
The compensation circuit that the driving compensating unit includes is set in the data drive circuit.
In practical operation, the data drive circuit can be data driving chip, the source voltage control circuit
Chip can be supplied for supply voltage, data driving chip and supply voltage supply chip are mutually indepedent.
As shown in fig. 7, being display base plate marked as 70, it is data driving chip marked as 71, is marked as 72
Supply voltage supplies chip, schematically delineates four articles of power voltage lines in Fig. 7: first row power voltage line VDL1, the
Two column power voltage line VDL2, third column power voltage line VDL3 and the 4th column power voltage line VDL4, and it is schematical in Fig. 7
It draws in addition to four data lines: the first column data line DL1, the second column data line DL2, third column data line DL3 and the 4th columns
According to line DL4；VDL1 is connect with the first pin of supply voltage supply chip 72, and the second of VDL2 and supply voltage supply chip 72
The third pin of pin connection, VDL3 and supply voltage supply chip 72 connect, and VDL4 and supply voltage supply the of chip 72
The connection of four pins；DL1 is connect with the first pin of data driving chip 71, and the second pin of DL2 and data driving chip 71 connects
It connects, DL3 is connect with the third pin of data driving chip 71, and DL4 is connect with the 4th pin of data driving chip 71.
In embodiments of the present invention, the N number of son for being located at m column that m column power voltage line and m-th of pixel circuit include
Pixel circuit all connects, according to the current value on m column power voltage line, can to the data voltage on m column data line into
Row adjustment, to promote display precision.
And in order to reduce the complexity of driving compensation circuit as far as possible, while in view of influencing shining in sub-pixel circuits
The principal element of the light emission luminance of element will not change rapidly in the short time, therefore " the detection-benefit in technical solution of the present invention
Repay " process do not need in each frame picture display time to each column sub-pixel circuits yet while carrying out, and it can be according to practical need
It is spaced the implementation that is staggered.For example, first row sub-pixel circuits are detected and are calculated in first frame picture display time
Offset data voltage operation is detected and is calculated offset data to secondary series sub-pixel circuits in the tenth frame picture display time
Voltage operation, and so on.
In preferable case, the data drive circuit and the source voltage control circuit be can be set in same integrated
In circuit.
As shown in figure 8, be display base plate marked as 70, the drive integrated circult marked as 81, the data-driven electricity
Road and the source voltage control circuit are integrated in the drive integrated circult 81；Four are schematically delineated in Fig. 8
Power voltage line: first row power voltage line VDL1, secondary series power voltage line VDL2, third column power voltage line VDL3 and
Four column power voltage line VDL4, and schematically drawn in Fig. 7 in addition to four data lines: the first column data line DL1, the second columns
According to line DL2, third column data line DL3 and the 4th column data line DL4；VDL1 is connect with the first pin of drive integrated circult 81,
VDL2 is connect with the second pin of drive integrated circult 81, and VDL3 is connect with the third pin of drive integrated circult 81, VDL4 with
4th pin of drive integrated circult 81 connects；DL1 is connect with the 5th pin of drive integrated circult 81, and DL2 and driving are integrated
6th pin of circuit 81 connects, and DL3 is connect with the 7th pin of drive integrated circult 81, DL4 and drive integrated circult 81
The connection of 8th pin.
Display device provided by the embodiment of the present invention can be mobile phone, tablet computer, television set, display, notebook
Any products or components having a display function such as computer, Digital Frame, navigator.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of driving compensating unit, is applied to pixel circuit, the pixel circuit includes N number of sub-pixel electricity positioned at m column
Road, N number of sub-pixel circuits are all connect with m column power voltage line, N number of sub-pixel circuits all with m column data line
Connection, m are positive integer, and N is the integer greater than 1；It is characterized in that, the driving compensating unit includes current detection circuit, mends
Repay data voltage generative circuit and compensation circuit, wherein
The current detection circuit is used in detection drive cycle, and detection flows through the m column power supply when line n grid line is opened
N-th current value of pressure-wire, and detect the (n+1)th electric current that the m column power voltage line is flowed through when the (n+1)th row grid line is opened
Value；N is the positive integer less than or equal to N；
The offset data voltage generation circuit is used to calculate the electric current between (n+1)th current value and n-th current value
Difference, and the difference between the current differential and scheduled current difference is calculated, determine that the difference is actual current difference, when the reality
When the absolute value of border current differential is greater than target offset threshold value, offset data voltage is generated according to the actual current difference；
The compensation circuit is used in compensation drive cycle, when the (n+1)th row grid line is opened, according to the offset data electricity
Pressure compensates the data voltage on the m column data line.
2. driving compensating unit as described in claim 1, which is characterized in that the offset data voltage generation circuit includes meter
Operator circuit compares sub-circuit and offset data voltage generation sub-circuit, wherein
The calculating sub-circuit is connect with the current detection circuit, for calculating (n+1)th current value and n-th electric current
Current differential between value, and the difference between the current differential and scheduled current difference is calculated, determine the difference for practical electricity
Flow difference；
The relatively sub-circuit is connect with the calculating sub-circuit, for comparing the absolute value of the actual current difference and making a reservation for inclined
Poor threshold value, and when the absolute value of the actual current difference is greater than the target offset threshold value, to the offset data voltage
It generates sub-circuit and sends generation control signal；
The offset data voltage generate sub-circuit respectively with the calculatings sub-circuit and it is described relatively sub-circuit connection, be used for
After receiving the generation control signal, the offset data voltage is generated according to the actual current difference.
3. driving compensating unit as claimed in claim 1 or 2, which is characterized in that the compensation circuit is used to drive in compensation
Period, when the (n+1)th row grid line is opened, initial data voltage and offset data electricity that data drive unit is provided
Pressure is added, and with data voltage after being compensated, and data voltage after the compensation is provided to the m column data line.
4. a kind of driving compensation method, is applied to pixel circuit, the pixel circuit includes N number of sub-pixel electricity positioned at m column
Road, N number of sub-pixel circuits are all connect with m column power voltage line, N number of sub-pixel circuits all with m column data line
Connection, m are positive integer, and N is the integer greater than 1；It is characterized in that, the driving compensation method includes:
In detection drive cycle, current detection circuit detection flows through the m column power voltage line when line n grid line is opened
N-th current value, and detect the (n+1)th current value that the m column power voltage line is flowed through when the (n+1)th row grid line is opened；N is small
In or equal to N positive integer；
Offset data voltage generation circuit calculates the current differential between (n+1)th current value and n-th current value, and counts
The difference between the current differential and scheduled current difference is calculated, determines that the difference is actual current difference, when the actual current is poor
When the absolute value of value is greater than target offset threshold value, offset data voltage is generated according to the actual current difference；
In compensation drive cycle, when the (n+1)th row grid line is opened, compensation circuit is according to the offset data voltage to described
Data voltage on m column data line compensates.
5. driving compensation method as claimed in claim 4, which is characterized in that the offset data voltage generation circuit includes meter
Operator circuit compares sub-circuit and offset data voltage generation sub-circuit；
The offset data voltage generation circuit calculates the current differential between (n+1)th current value and n-th current value,
And the difference between the current differential and scheduled current difference is calculated, determine that the difference is actual current difference, when the practical electricity
When flowing the absolute value of difference greater than target offset threshold value, generating offset data voltage steps according to the actual current difference includes:
The calculating sub-circuit calculates the current differential between (n+1)th current value and n-th current value, and calculates the electricity
The difference between difference and scheduled current difference is flowed, determines that the difference is actual current difference；
The relatively sub-circuit compares the absolute value and target offset threshold value of the actual current difference, and when the actual current is poor
When the absolute value of value is greater than the target offset threshold value, sub-circuit is generated to the offset data voltage and sends generation control letter
Number；
The offset data voltage generates sub-circuit after receiving the generation control signal, according to the actual current difference
Generate the offset data voltage.
6. driving compensation method as described in claim 4 or 5, which is characterized in that it is described in compensation drive cycle, when described the
When n+1 row grid line is opened, the compensation circuit is according to the offset data voltage to the data voltage on the m column data line
Compensating step includes:
In compensation drive cycle, when the (n+1)th row grid line is opened, original that the compensation circuit provides data drive unit
Beginning data voltage is added with the offset data voltage, with data voltage after being compensated, and by data voltage after the compensation
It is provided to the m column data line.
7. driving compensation method as claimed in claim 6, which is characterized in that further include: when the actual current difference is greater than 0
When, it is negative voltage that the offset data voltage generation circuit, which controls the offset data voltage,；
When the actual current difference is less than 0, the offset data voltage generation circuit controls the offset data voltage and is
Positive voltage.
8. a kind of display device, which is characterized in that including the driving compensation as described in any claim in claims 1 to 3
Unit.
9. display device as claimed in claim 8, which is characterized in that the display device further includes display panel, data drive
Dynamic circuit and source voltage control circuit；The display panel includes display base plate, M pixel circuit, M column power voltage line, M
Column data line and N row grid line；The M pixel circuit, the M column power voltage line, the M column data line and the N row grid
Line is all set on the display base plate；M and N is positive integer；M is the positive integer less than or equal to M, and n is less than or equal to N
Positive integer；
M-th of pixel circuit includes N number of sub-pixel circuits positioned at m column；The N number of sub-pixel circuits for being located at m column are all
It is connect with m column power voltage line, the N number of sub-pixel circuits for being located at m column are all connect with m column data line；
The data drive circuit includes for providing the data-driven list of initial data voltage corresponding with M column data line respectively
Member；
The compensation circuit that the driving compensating unit includes is set in the data drive circuit.
10. display device as claimed in claim 9, which is characterized in that the data drive circuit and the supply voltage control
Circuit processed is set in same integrated circuit.
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Cited By (1)
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| CN112309307A (en) * | 2020-11-09 | 2021-02-02 | 合肥维信诺科技有限公司 | Dynamic compensation method for display device and display panel |
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