CN105355185B - Driving circuit, display device and its driving method of display panel - Google Patents
Driving circuit, display device and its driving method of display panel Download PDFInfo
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- CN105355185B CN105355185B CN201510931188.6A CN201510931188A CN105355185B CN 105355185 B CN105355185 B CN 105355185B CN 201510931188 A CN201510931188 A CN 201510931188A CN 105355185 B CN105355185 B CN 105355185B
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
-
- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
Abstract
The embodiment of the present application discloses driving circuit, display device and its driving method of display panel.Driving circuit includes control chip, and control chip includes：Receiving module is used for the corresponding voltage signal of receiving panel flicker value；First analysis module for adjusting common voltage according to fixed voltage difference, and based on the common voltage corresponding to the panel flash value got during the adjustment, determines the value range of common voltage；Second analysis module is used to adjust common voltage according to on-fixed voltage difference in value range, and based on the common voltage corresponding to the panel flash value detected during the adjustment, determines the end value of common voltage；Sending module, the common voltage for being obtained respectively by the first initial value, in fixed voltage difference adjustment process, the voltage signal corresponding to variable voltage difference adjustment process obtained common voltage and end value are supplied to display panel.The driving circuit can efficiently obtain best common voltage.
Description
Technical field
This application involves electronic technology fields, and in particular to field of display devices more particularly to a kind of drive of display panel
Dynamic circuit, display device and its driving method.
Background technology
It is existing since the problems such as direct current residual is deteriorated with liquid crystal can occur under prolonged DC driven for liquid crystal molecule
There is liquid crystal display that exchange way is generally used to be driven.When carrying out exchange driving to display panel, it is likely that because
Voltage difference between the input signal of positive and negative half cycle and common voltage is different, and the problem of cause film flicker.Therefore, it is necessary to
The common voltage of display panel is adjusted, to avoid film flicker problem as possible.
The prior art is in the optimum value for determining common voltage, typically using a certain voltage value as starting point, more than with it is small
It takes a certain number of common voltage values respectively in the range of the voltage value, and detects its corresponding flicker value.Finally by dodging
The situation of change of bright value, determines the optimum value of common voltage.Fig. 1 shows the one kind for determining best common voltage in the prior art
The principle schematic diagram of scheme.In coordinate system shown in Fig. 1, horizontal axis can represent the value of common voltage (VCOM), and indulge
Axis can represent flicker value (Flicker) of the display panel under corresponding common voltage.It specifically can first take be used as common electrical at 0 point
Then the initial value of pressure determines 5 continuous test points (putting 1,2,3,4 and 5) in the range of more than 0 point, while small
Other 5 continuous test points (putting 1 ', 2 ', 3 ', 4 ' and 5 ') are determined in the range of 0 point, wherein the adjacent survey of any two
Voltage difference between pilot is identical.Then, it by detecting the flicker value of all test points including 0 point, determines
The test point of flicker value minimum i.e. point 4 '.Then, determined again in the range of less than point 4 ' 5 continuous test points (put 5 ',
6 ', 7 ', 8 ' and 9 ') and its flicker value is detected.If the flicker value of point 4 ' is less than the flicker value of point 5 ', 6 ', 7 ', 8 ' and 9 ', can
It is determined as best common voltage so that 4 ' corresponding voltage values will be put.
But the above method usually requires to assess the value range of best common voltage in advance, in order to ensure best public
In the value range, this range would generally take larger voltage, therefore can increase the sweep time of common voltage, reduce most
The determination efficiency of good common voltage.
Invention content
In view of drawbacks described above in the prior art or deficiency, it is desired to be able to provide a kind of efficient common voltage determination side
Case.In order to realize said one or multiple purposes, the embodiment of the present application provides a kind of driving circuit of display panel, display dress
It sets and its driving method.
In a first aspect, the embodiment of the present application provides a kind of driving circuit of display panel, which includes control
Chip, the control chip include the common voltage being preset in control chip the first initial value, fixed voltage be poor, voltage tune
Save coefficient and voltage threshold and receiving module, the first analysis module, the second analysis module and sending module, wherein
The panel flash value that the receiving module is used to receive the display panel that photoelectric sensor detects is corresponding
Voltage signal；
First analysis module includes：Voltage-adjusting unit, acquiring unit, judging unit, determination unit and feedback
Member；
First analysis module, for being based on first initial value, driving is executed with lower unit and determines step as follows：
The voltage-adjusting unit, it is poor for adding and subtracting respectively the fixed voltage by first initial value, it obtains
To the first voltage value and second voltage value；
The acquiring unit, for obtaining the display panel in first initial value, the first voltage value and institute
The panel flash value under second voltage value is stated, the first initial scintillation value, the first flicker value and the second flicker value are obtained；
The judging unit, for judge the first initial scintillation value whether and meanwhile be less than first flicker value and institute
State the second flicker value；
The determination unit, if being less than first flicker value and described second simultaneously for the first initial scintillation value
Flicker value, then using the common voltage corresponding to first flicker value and second flicker value as the pole of the value range
Limit value, and it is sent to second analysis module；
The feedback unit, if being more than or equal to first flicker value or described second for the first initial scintillation value
Flicker value, then by the common electrical corresponding to the minimum value in the first initial scintillation value, the first flicker value and the second flicker value
Pressure is used as the first initial value, and feeds back to the voltage-adjusting unit to execute the determining step again；
Second analysis module, for determining on-fixed electricity according to the fixed voltage difference and the voltage regulation coefficient
Pressure difference, and the common voltage is adjusted according to the on-fixed voltage difference in the value range, and based on described non-
Fixed voltage difference adjusts the common voltage met corresponding to the panel flash value of the second predetermined condition got in the process,
Determine the end value of the common voltage；
The sending module, for what is obtained respectively by first initial value, in fixed voltage difference adjustment process
Common voltage and the voltage signal corresponding to the obtained common voltage of variable voltage difference adjustment process are supplied to described aobvious
Show panel, to drive the display panel to be shown under corresponding common voltage.
Second aspect, the embodiment of the present application provide a kind of display device, the display device include display panel and on
The driving circuit of the display panel of first aspect offer is provided.
The third aspect, the embodiment of the present application provide a kind of driving method of display device, which includes display
The driving circuit for the display panel that panel and above-mentioned first aspect provide, the driving circuit include control chip, this method
Including：
Obtain the common voltage being preset in the control chip the first initial value, fixed voltage be poor, voltage adjusts and is
Number and voltage threshold；
Based on first initial value, following determining step is executed：First initial value is added and is subtracted respectively institute
The corresponding voltage value of fixed voltage difference is stated, the first voltage value and second voltage value are obtained；The display panel is obtained described
Panel flash value under one initial value, the first voltage value and the second voltage value obtains the first initial scintillation value, first
Flicker value and the second flicker value；Judge the first initial scintillation value whether and meanwhile be less than first flicker value and described second
Flicker value；If so, using the common voltage corresponding to first flicker value and second flicker value as the value model
The limiting value enclosed；It otherwise, will be corresponding to the minimum value in the first initial scintillation value, the first flicker value and the second flicker value
Common voltage executes the determining step again as the first initial value；
On-fixed voltage difference is determined according to the fixed voltage difference and the voltage regulation coefficient, and in the value range
It is interior to adjust the common voltage according to the on-fixed voltage difference, and obtained in the process based on being adjusted in the on-fixed voltage difference
That gets meets the common voltage corresponding to the panel flash value of the second predetermined condition, determines the final of the common voltage
Value.
Driving circuit, display device and its driving method of display panel provided by the embodiments of the present application, can lead to first
It crosses larger fixed voltage difference and carries out voltage adjustment, quickly to determine the substantially value range of common voltage, then in this model
Enable voltage scanning section Fast Convergent by reducing on-fixed voltage difference every time in enclosing, to improve common voltage most
The determination efficiency of good value.
Description of the drawings
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other
Feature, objects and advantages will become more apparent upon：
Fig. 1 is a kind of principle schematic diagram of scheme of determining best common voltage in the prior art；
Fig. 2 is the structural schematic diagram of one embodiment of the driving circuit of the application display panel；
Fig. 3 is the structural schematic diagram of one embodiment of the first analysis module in the application driving circuit；
Fig. 4 is the principle signal of one embodiment that the first analysis module of the application determines common voltage value range
Figure；
Fig. 5 is the structural schematic diagram of one embodiment of the second analysis module in the application driving circuit；
Fig. 6 is the principle signal of the one embodiment for the end value that the second analysis module of the application determines common voltage
Figure；
Fig. 7 is the flow chart of one embodiment of the driving method of the application display device.
Specific implementation mode
The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining related invention, rather than the restriction to the invention.It also should be noted that in order to
Convenient for description, is illustrated only in attached drawing and invent relevant part with related.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Referring to FIG. 2, it illustrates the structural schematic diagrams of one embodiment of the driving circuit of the application display panel.
As shown in Fig. 2, the driving circuit of the present embodiment includes：Control chip 20.In the memory space of the control chip 20
It is interior, the ginsengs such as the first initial value, the fixed voltage that can also be previously stored with common voltage be poor, voltage regulation coefficient and voltage threshold
Number.Wherein, common voltage can be supplied to display panel by driving circuit, to drive display panel to be shown.Optionally, originally
Driving circuit in embodiment can be only used for adjusting common voltage for display panel.And display panel is required in display
It shows signal, can be provided by other circuits in addition to driving circuit.
Receiving module 21, the first analysis module 22,23 and of the second analysis module are may further include in control chip 20
Sending module 24, and can carry out data transmission between modules.Meanwhile the modules in chip 20 are controlled, may be used also
To obtain pre-stored one or more parameters out of above-mentioned memory space.
In the present embodiment, receiving module 21 can be used for receiving the panel sudden strain of a muscle for the display panel that photoelectric sensor detects
It is bright to be worth corresponding voltage signal.External photoelectric sensor (such as luminance meter) can believe the optics of the display panel detected
Number electric signal is converted to, and by the calculating to electric signal, obtains panel flash value of the display panel under a certain common voltage.
The panel flash value can also be transferred to control core by photoelectric sensor after obtaining panel flash value in a manner of voltage signal
Piece 20.Receiving module 21 in control chip 20 can be terminated from photoelectric sensor receives voltage corresponding with panel flash value
Signal.
It should be noted that being research extensively at present above by the various methods of photoelectric sensor detection panel flicker value
With the known technology of application, details are not described herein.
In some optional realization methods of the present embodiment, above-mentioned panel flash value can be that display panel is predetermined in display
Flicker value when grayscale.Wherein, the specific value of predetermined grayscale can be set according to actual needs.For example, for that can show
For the display panel for showing 256 grades of grayscale, above-mentioned panel flash value can show flicker value when the 128th grade of grayscale for it.
In some optional realization methods of the present embodiment, above-mentioned driving circuit is additionally operable to provide display letter for display panel
Number.Driving circuit in the present embodiment can also be provided further for it aobvious other than adjusting common voltage for display panel
Show signal, for example, voltage signal corresponding with grayscale to be shown.In this way, only through this embodiment in driving circuit can
To fully achieve the display function of display panel.
In the present embodiment, the first analysis module 22 can be used for using the first initial value as starting point, according to fixed voltage
Difference adjustment common voltage, and based on the panel flash for meeting the first predetermined condition got in the process in the adjustment of fixed voltage difference
The corresponding common voltage of value, determines the value range of common voltage.Specifically, the first analysis module 22 can be first from control
The first initial value and the fixed voltage that the common voltage to prestore is obtained in the memory space of chip 20 are poor.It is then possible to first
It is gradually superimposed on initial value or to reduce fixed voltage poor.It is poor to be often superimposed or reduce a fixed voltage, is equivalent to common electrical
Pressure has carried out the adjustment of a fixed step size.
During adjusting common voltage according to fixed voltage difference, often adjustment is primary, above-mentioned receiving module 21
The corresponding voltage signal of panel flash value under current common voltage is received from photoelectric detector termination, and by the signal transmission
To the first analysis module 22.In this way, during common voltage is adjusted according to fixed step size, the first analysis module 22 can obtain
Get the correspondence curve between common voltage and panel flash value.It, can when panel flicker value meets the first predetermined condition
According to its corresponding common voltage, to determine the substantially value range of common voltage.Wherein, the specific rule of the first predetermined condition
It can then be set according to actual needs.If for example, there is inflection point in the change curve of panel flash value, this can be turned
Central point of the corresponding common voltage value of point as above-mentioned value range.
In the present embodiment, the second analysis module 23 can be used for being determined according to fixed voltage difference and voltage regulation coefficient non-
Fixed voltage is poor, and adjusts common voltage according to on-fixed voltage difference in the value range that the first analysis module 22 determines, with
And met corresponding to the panel flash value of the second predetermined condition based on what is got in the process in the adjustment of on-fixed voltage difference
Common voltage, determine the end value of common voltage.Specifically, second analysis module 23 can be deposited from control chip 20 first
The fixed voltage difference to prestore and voltage regulation coefficient are obtained in storage space.It is then possible to be determined first according to the two parameters non-
The changing rule of fixed voltage difference.Then, common voltage can be adjusted according to on-fixed voltage difference, that is, in common voltage
The voltage difference increased or decreased every time is different, is equivalent to and has carried out the adjustment of variable step size to common voltage.Optionally,
On-fixed voltage difference can be carried out gradually adjusting to fixed voltage difference and obtained by voltage regulation coefficient.
During adjusting common voltage according to on-fixed voltage difference, often adjustment is primary, and above-mentioned receiving module 21 can be with
The corresponding voltage signal of panel flash value under current common voltage is received from photoelectric detector termination, and by the signal transmission
To the second analysis module 23.In this way, during common voltage is adjusted according to variable step size, the second analysis module 23 can obtain
Get the correspondence curve between common voltage and panel flash value.It, can when panel flicker value meets the second predetermined condition
According to its corresponding common voltage, to determine the end value of common voltage, that is, best common voltage.Wherein, second is pre-
The specific rules of fixed condition can be set according to actual needs.For example, can will be corresponding to the minimum value of panel flash value
End value of the common voltage value as common voltage.
In the present embodiment, sending module 24, for being obtained respectively by the first initial value, in fixed voltage difference adjustment process
Common voltage and the voltage signal corresponding to the obtained common voltage of variable voltage difference adjustment process be supplied to display panel,
To drive display panel to be shown under corresponding common voltage.Specifically, sending module 24 can be from control chip 20
The first initial value that the common voltage to prestore is obtained in memory space can also be obtained from the first analysis module 22 in fixed electricity
The common voltage that pressure difference adjustment process obtains can also be obtained from the second analysis module 23 and be obtained in variable voltage difference adjustment process
The common voltage arrived.Also, the common voltage got further can be passed through the form of voltage signal, hair by sending module 24
Give display panel so that display panel can be shown under different common voltages.In this way, when display panel is shown
When showing, above-mentioned photoelectric sensor may be used for panel flash value of the detection display panel under different common voltage.
The driving circuit of display panel provided by the embodiments of the present application can be carried out first by larger fixed voltage difference
Voltage adjusts, quickly to determine the substantially value range of common voltage, then by reducing on-fixed every time within the scope of this
Voltage difference enables voltage scanning section Fast Convergent, to improve the determination efficiency of common voltage optimum value.
With further reference to Fig. 3, it illustrates the structures of one embodiment of the first analysis module in the application driving circuit
Schematic diagram.
As shown in figure 3, the first analysis module 22 may include：Voltage-adjusting unit 221, acquiring unit 222, judging unit
223, determination unit 224 and feedback unit 225.
First analysis module 22 can be further used for the first initial value based on common voltage, driving voltage adjustment unit
221, acquiring unit 222, judging unit 223, determination unit 224 and feedback unit 225 execute following determining steps.
In the present embodiment, voltage-adjusting unit 221 can be used for that the first initial value is added and subtracted respectively fixed electricity
Pressure difference obtains the first voltage value and second voltage value.Above-mentioned sending module 24 can be by the first initial value, the first voltage value and
The corresponding voltage signal of two voltage values is sent to display panel so that display panel can be shown under above-mentioned common voltage
Show.Meanwhile photoelectric sensor can detect face of the display panel under the first initial value, the first voltage value and second voltage value
Plate flicker value.
In this way, acquiring unit 222, which can be used for obtaining end from photoelectric sensor, obtains display panel in the first initial value, the
Panel flash value under one voltage value and second voltage value obtains the first initial scintillation value, the first flicker value and the second flicker value.
The first flicker value that judging unit 223 can be used for respectively obtaining the first initial scintillation value that acquiring unit 222 obtains with it
Be compared with the second flicker value, with judge the first initial scintillation value whether and meanwhile be less than the first flicker value and the second flicker value.
In the present embodiment, if determination unit 224 can be used for judging unit 223 and judge the first initial scintillation value simultaneously
Less than the first flicker value and the second flicker value, then using the common voltage corresponding to the first flicker value and the second flicker value as value
The limiting value of range.Specifically, since the first initial value is between the first voltage value and second voltage value, when the first initial sudden strain of a muscle
When sparkling value while being less than the first flicker value and the second flicker value, illustrate that panel flash value is likely to the curve that common voltage changes
Occurs inflection point between the first voltage value and second voltage value.That is, public corresponding to the minimum value of panel flash value
Voltage, it is likely that be located between the common voltage corresponding to the first flicker value and the second flicker value.It therefore, can be by the first flicker
Limiting value of the common voltage as value range corresponding to value and the second flicker value.It specifically can be by the first voltage value and with
The minimum value of smaller that as value range in two voltage values, and using that larger as the maximum value of value range.
Determination unit 224 by the value range determined and can also be sent to the second analysis module 23.
Feedback unit 225, if for judging unit 223 judge the first initial scintillation value be more than or equal to the first flicker value or
Second flicker value, then by the common electrical corresponding to the minimum value in the first initial scintillation value, the first flicker value and the second flicker value
Pressure is used as the first initial value, and feeds back to above-mentioned voltage-adjusting unit 221 to execute above-mentioned determining step again.Specifically, by
In the first initial value between the first voltage value and second voltage value, when the first initial scintillation value is more than or equal to the first flicker value
Or when the second flicker value, illustrate curve that panel flash value changes with common voltage between the first voltage value and second voltage value
There is no inflection points.That is, the common voltage corresponding to the minimum value of panel flash value, it is likely that be located at the first flicker value and
Except common voltage corresponding to second flicker value.It therefore, can be by the first initial scintillation value, the first flicker value and the second flicker
The common voltage corresponding to minimum value in value is used as the first initial value again, and feeds back to above-mentioned voltage-adjusting unit 221, with
Allow voltage-adjusting unit 221, acquiring unit 222, judging unit 223, determination unit 224 and feedback unit 225 again
Above-mentioned determining step is executed, until determining the value range of common voltage.
In order to make it easy to understand, determining that the scheme of the value range of common voltage is carried out to the present embodiment further combined with Fig. 4
It illustrates.Fig. 4 shows that the first analysis module of the application determines the principle of one embodiment of common voltage value range
Schematic diagram.In coordinate system shown in Fig. 4, horizontal axis can represent the value of common voltage (VCOM), and the longitudinal axis can represent it is aobvious
Show flicker value (Flicker) of the panel under corresponding common voltage.As shown in figure 4, can be first by the first initial value, that is, initial
It is poor that VCOM adds and subtract respectively fixed voltage, obtains the first voltage value VCOM1 and second voltage value VCOM2.At this point, display surface
Panel flash value of the plate at VCOM1, initial VCOM and VCOM2 is incremented by successively, is unsatisfactory for determining common voltage value range
Condition.Therefore, can be using the VCOM1 of panel flash value minimum as the first initial value, and continue that VCOM1 is added and subtracted respectively
It goes fixed voltage poor, obtains VCOM3 and initial VCOM.At this point, panel of the display panel at initial VCOM, VCOM1 and VCOM3
Flicker value is successively decreased successively, still not satisfies the condition of determining common voltage value range.Therefore, it is necessary to panel flash value is minimum
VCOM3 as the first initial value, and it is poor to continue VCOM3 is added and subtracted respectively fixed voltage, obtains VCOM4 and VCOM1.
This time, panel flash value of the display panel at initial VCOM3 is less than the panel flash value at VCOM1 and VCOM4 simultaneously,
Thus may determine that common voltage value range is between VCOM1 and VCOM4.
With further reference to Fig. 5, it illustrates the structures of one embodiment of the second analysis module in the application driving circuit
Schematic diagram.
As shown in figure 5, the second analysis module 23 may include：Initial value determination unit 231, voltage difference determination unit 232, electricity
Press adjustment unit 233, acquiring unit 234, judging unit 235, determination unit 236 and feedback unit 237.
In the present embodiment, the value range that initial value determination unit 231 can be used for determining the first analysis module 22
Midpoint is determined as the second initial value of common voltage.Voltage difference determination unit 232 is determined for the specific of variable voltage difference
Value.Specifically, voltage difference determination unit 232 can be obtained from the memory space of control chip 20 the fixed voltage difference that prestore and
Voltage regulation coefficient, then fixed voltage difference be multiplied with voltage regulation coefficient, so that it may to obtain initial voltage difference, i.e. on-fixed electricity
The initial value of pressure difference.Wherein, voltage regulation coefficient is more than 0 and is less than 1.It is fixed in this way, obtained on-fixed voltage difference can be less than
Voltage difference, so as to realize the fine tuning in value range to common voltage.
In the present embodiment, it is initial can be further used for second based on above-mentioned common voltage for the second analysis module 23
Value, driving voltage adjustment unit 233, acquiring unit 234, judging unit 235, determination unit 236 and feedback unit 237 execute such as
Lower end value determines step.
Specifically, it is single to can be used for that the second initial value is added and subtracted respectively voltage difference determination for voltage-adjusting unit 233
The initial voltage difference that member 232 is determined, obtains third voltage value and the 4th voltage value.Above-mentioned sending module 24 can will be at the beginning of second
Initial value, third voltage value and the corresponding voltage signal of the 4th voltage value are sent to display panel so that display panel can be upper
It states and is shown under common voltage.Meanwhile photoelectric sensor can detect display panel in the second initial value, third voltage value
With the panel flash value under the 4th voltage value.
In this way, acquiring unit 234, which can be used for obtaining end from photoelectric sensor, obtains display panel in the second initial value, the
Panel flash value under three voltage values and the 4th voltage value obtains the second initial scintillation value, third flicker value and the 4th flicker value.
Judging unit 235 can obtain the voltage threshold that prestore from the memory space of control chip 20 first, and from initial value
Initial voltage difference is obtained in determination unit 231.Then initial voltage difference is compared with voltage threshold, to judge initial voltage
Whether difference is less than or equal to voltage threshold.
Due to the size of on-fixed voltage difference, the Adjustment precision to common voltage is represented.When on-fixed voltage difference is gradual
When diminution, the common voltage accuracy determined can also be gradually increased.During actually adjusting, due to being not necessarily to infinitely carry
The precision of high common voltage.It therefore can be by being pre-stored in the voltage threshold controlled in chip 20, to determine on-fixed voltage difference
Minimum value, that is, control common voltage final precision.
In the present embodiment, determination unit 236 can be used for judging that initial voltage difference is less than or equal to when judging unit 235
When voltage threshold, illustrates the common voltage adjusted according to on-fixed voltage difference, had reached its setting accuracy.It therefore can be straight
It connects corresponding to the minimum value in the second initial scintillation value, third flicker value and the 4th flicker value for obtaining acquiring unit 234
End value of the common voltage as common voltage, i.e., best common voltage.
Feedback unit 237, for when judging unit 235 judge initial voltage difference be more than voltage threshold when, illustrate according to
The common voltage of on-fixed voltage difference adjustment does not reach its setting accuracy also.Therefore it needs to further decrease on-fixed voltage difference,
Common voltage is adjusted again.It specifically, can will be in the second initial scintillation value, third flicker value and the 4th flicker value
The corresponding common voltage of minimum value is as the second initial value, and using initial voltage difference and the product of voltage regulation coefficient as initial
Then voltage difference feeds back to voltage-adjusting unit 233, so that voltage-adjusting unit 233, acquiring unit 234, judging unit
235, determination unit 236 and feedback unit 237 can execute above-mentioned end value and determine step again, until initial voltage difference is less than
Until voltage threshold.
In some optional realization methods of the present embodiment, above-mentioned voltage regulation coefficient can be more than or equal to 0.5.Work as voltage
, every time can be half as large by variable voltage subtractive when adjustment factor is equal to 0.5, that is, sweep span is reduced 1/2.Therefore,
Convergence rate is very fast, can further increase the efficiency for determining best common voltage.
In order to make it easy to understand, determining that the scheme of the end value of common voltage has to the present embodiment further combined with Fig. 6
Body explanation.Fig. 6 shows that the second analysis module of the application determines that the principle of one embodiment of the end value of common voltage is shown
It is intended to.In coordinate system shown in Fig. 6, horizontal axis can represent the value of common voltage (VCOM), and the longitudinal axis can represent display
Flicker value (Flicker) of the panel under corresponding common voltage.As shown in fig. 6, the value range of predetermined common voltage
Between minimum M in and maximum value Max, the second analysis module can first determine the midpoint of value range, that is, initial VCOM
For the second initial value.Then fixed voltage difference Δ V is multiplied by voltage regulation coefficient 0.5, obtains initial voltage difference Δ V/2.Then,
Initial VCOM is added and subtracted initial voltage difference Δ V/2 respectively, obtains two voltage values VCOM1 and VCOM2.If prestoring
Voltage threshold be Δ V/4, then may determine that current initial voltage difference Δ V/2 be more than voltage threshold Δ V/4.Therefore, may be used
The VCOM2 of panel flash value minimum is multiplied by voltage adjusting as the second initial value, and by current initial voltage difference Δ V/2
Coefficient 0.5 obtains new initial voltage difference Δ V/4.Then, can VCOM2 be added and be subtracted respectively new initial voltage difference
Δ V/4, obtains VCOM3 and VCOM4.This time, it can be determined that go out current initial voltage difference Δ V/4 and be equal to voltage threshold.Cause
This can end values of the VCOM3 of panel flash value minimum as common voltage directly in VCOM2, VCOM3 and VCOM4, i.e., most
Good common voltage.
In the embodiment shown in fig. 6, due to common voltage scanning always the both sides of best common voltage in turn
Carry out, thus can to avoid common voltage in the prior art (such as shown in Fig. 1) value always by the one of best common voltage
Side is scanned to the other side, and is easy to lead to the problem of electrostatic residual (bias voltage) in liquid crystal capacitance so that is finally determined
Common voltage value is more accurate.
The driving circuit of display panel based on above-mentioned offer, present invention also provides a kind of display devices.In this implementation
In example, display device may include the driving circuit of the display panel described in display panel and any of the above-described embodiment.
With further reference to Fig. 7, it illustrates the flow charts of one embodiment of the driving method of the application display device.It should
Driving method can be applied to include in the display device of driving circuit described in any of the above-described embodiment.Wherein, driving electricity
Road includes control chip, and the first initial value, the fixed voltage that prestore in control chip common voltage are poor, voltage adjusting
Coefficient and voltage threshold.
Driving method in the present embodiment can specifically include：
First, in step 701, the first initial value, the fixed voltage of the common voltage being preset in control chip are obtained
Difference, voltage regulation coefficient and voltage threshold.
Secondly, in a step 702, using the first initial value as starting point, common voltage, and base are adjusted according to fixed voltage difference
In adjusting the common voltage met corresponding to the panel flash value of the first predetermined condition that gets in the process in fixed voltage difference,
Determine the value range of common voltage.
Finally, in step 703, on-fixed voltage difference is determined according to fixed voltage difference and voltage regulation coefficient, and taking
It is worth in range and adjusts common voltage according to on-fixed voltage difference, and based on is got in the process in the adjustment of on-fixed voltage difference
Meet the common voltage corresponding to the panel flash value of the second predetermined condition, determines the end value of common voltage.
In some optional realization methods of the present embodiment, using the first initial value as starting point, according to fixed voltage difference tune
Whole common voltage, and based on the panel flash value institute for meeting the first predetermined condition got in the process in the adjustment of fixed voltage difference
Corresponding common voltage determines that the value range of common voltage includes：
Based on the first initial value, following determining step is executed：
First initial value is added and subtracted respectively the corresponding voltage value of fixed voltage difference, obtains the first voltage value and second
Voltage value；
Panel flash value of the display panel under first initial value, the first voltage value and second voltage value is obtained, is obtained
To the first initial scintillation value, the first flicker value and the second flicker value；
Judge the first initial scintillation value whether and meanwhile be less than the first flicker value and second flicker value；
If so, using the common voltage corresponding to the first flicker value and the second flicker value as the limiting value of value range；
Otherwise, by the common electrical corresponding to the minimum value in the first initial scintillation value, the first flicker value and the second flicker value
Pressure is used as the first initial value, executes above-mentioned determining step again.
In some optional realization methods of the present embodiment, determined according to fixed voltage difference and preset voltage regulation coefficient
On-fixed voltage difference, and common voltage is adjusted according to on-fixed voltage difference in value range, and based in on-fixed voltage
The common voltage met corresponding to the panel flash value of the second predetermined condition that difference adjustment detects in the process, determines common voltage
End value include：
The midpoint of value range is determined as to the second initial value of common voltage；
Fixed voltage difference is multiplied by voltage regulation coefficient, obtains initial voltage difference, wherein voltage regulation coefficient be more than 0 and
Less than 1；
Based on the second initial value, executes following end value and determine step：
Second initial value is added and subtracted respectively initial voltage difference, obtains third voltage value and the 4th voltage value；
Panel flash value of the display panel under the second initial value, third voltage value and the 4th voltage value is obtained, obtains the
Two initial scintillation values, third flicker value and the 4th flicker value；
Judge whether initial voltage difference is less than or equal to voltage threshold；
If so, by public corresponding to the minimum value in the second initial scintillation value, third flicker value and the 4th flicker value
Voltage is as end value；
Otherwise, using the corresponding common voltage of minimum value as the second initial value, initial voltage difference and voltage regulation coefficient
Product executes above-mentioned end value and determines step again as initial voltage difference.
In some optional realization methods of the present embodiment, voltage regulation coefficient is more than or equal to 0.5.
In some optional realization methods of the present embodiment, panel flash value is display panel when showing predetermined grayscale
Flicker value.
In some optional realization methods of the present embodiment, panel flash value detects to obtain by photoelectric sensor.
In some optional realization methods of the present embodiment, driving method further includes：Display signal is provided for display panel.
The driving method of display device provided in this embodiment can carry out voltage tune by larger fixed voltage difference
It is whole, quickly to determine the substantially value range of common voltage, then by reducing on-fixed voltage difference every time within the scope of this
Enable voltage scanning section Fast Convergent, to improve the determination efficiency of common voltage optimum value.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.People in the art
Member should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
Other technical solutions of arbitrary combination and formation.Such as features described above has similar work(with (but not limited to) disclosed herein
Can technical characteristic replaced mutually and the technical solution that is formed.
Claims (12)
1. a kind of driving circuit of display panel, which is characterized in that including controlling chip, the control chip includes being preset in control
The first initial value, the fixed voltage of common voltage in coremaking piece be poor, voltage regulation coefficient and voltage threshold, and receives mould
Block, the first analysis module, the second analysis module and sending module, wherein
The receiving module is used to receive the corresponding voltage of panel flash value for the display panel that photoelectric sensor detects
Signal；
First analysis module includes：Voltage-adjusting unit, acquiring unit, judging unit, determination unit and feedback unit；
First analysis module, for being based on first initial value, driving is executed with lower unit and determines step as follows：
The voltage-adjusting unit, it is poor for adding and subtracting respectively the fixed voltage by first initial value, obtain
One voltage value and second voltage value；
The acquiring unit, for obtaining the display panel in first initial value, the first voltage value and described
Panel flash value under two voltage values obtains the first initial scintillation value, the first flicker value and the second flicker value；
The judging unit, for judge the first initial scintillation value whether and meanwhile less than first flicker value and described the
Two flicker values；
The determination unit, if for the first initial scintillation value simultaneously less than first flicker value and second flicker
Value, then using the common voltage corresponding to first flicker value and second flicker value as the limiting value of value range, and
It is sent to second analysis module；
The feedback unit, if being more than or equal to first flicker value or second flicker for the first initial scintillation value
Value then makees the common voltage corresponding to the minimum value in the first initial scintillation value, the first flicker value and the second flicker value
For the first initial value, and the voltage-adjusting unit is fed back to execute the determining step again；
Second analysis module, for determining on-fixed voltage according to the fixed voltage difference and the voltage regulation coefficient
Difference, and the common voltage is adjusted according to the on-fixed voltage difference in the value range, and based on described non-solid
Constant voltage difference adjusts the common voltage met corresponding to the panel flash value of the second predetermined condition got in the process, really
The end value of the fixed common voltage；
The sending module is obtained for respectively by first initial value, in fixed voltage difference adjustment process public
Voltage and the voltage signal adjusted corresponding to the common voltage that process obtains in the on-fixed voltage difference are supplied to the display
Panel, to drive the display panel to be shown under corresponding common voltage.
2. driving circuit according to claim 1, which is characterized in that second analysis module includes：Initial value determines single
Member, voltage difference determination unit, voltage-adjusting unit, acquiring unit, judging unit, determination unit and feedback unit；
The initial value determination unit, the second initial value for the midpoint of the value range to be determined as to the common voltage；
The voltage difference determination unit obtains initial voltage for the fixed voltage difference to be multiplied by the voltage regulation coefficient
Difference, wherein the voltage regulation coefficient is more than 0 and is less than 1；
Second analysis module is further used for being based on second initial value, and driving is true with the following end value of lower unit execution
Determine step：
The voltage-adjusting unit obtains for adding and subtracting respectively the initial voltage difference by second initial value
Three voltage values and the 4th voltage value；
The acquiring unit, for obtaining the display panel in second initial value, the third voltage value and described
Panel flash value under four voltage values obtains the second initial scintillation value, third flicker value and the 4th flicker value；
The judging unit, for judging whether the initial voltage difference is less than or equal to the voltage threshold；
The determination unit, if being less than or equal to the voltage threshold for the initial voltage difference, by the described second initial sudden strain of a muscle
The common voltage corresponding to minimum value in bright value, third flicker value and the 4th flicker value is as the end value；
The feedback unit, if being more than the voltage threshold for the initial voltage difference, by the corresponding public affairs of the minimum value
Common voltage is as the second initial value, using the initial voltage difference and the product of the voltage regulation coefficient as initial voltage difference,
And it feeds back to the voltage-adjusting unit and determines step to execute the end value again.
3. driving circuit according to claim 2, which is characterized in that the voltage regulation coefficient is more than or equal to 0.5.
4. driving circuit according to any one of claims 1 to 3, which is characterized in that the panel flash value is described aobvious
Show flicker value of the panel when showing predetermined grayscale.
5. driving circuit according to claim 4, which is characterized in that the driving circuit is additionally operable to as the display panel
It provides and shows signal.
6. a kind of display device, which is characterized in that including display panel and according to any one of claims 1 to 5 aobvious
Show the driving circuit of panel.
7. a kind of driving method of display device, which is characterized in that the display device includes display panel and according to right
It is required that the driving circuit of 1 to 5 any one of them display panel, the driving circuit includes control chip；
The method includes：
Obtain the common voltage being preset in the control chip the first initial value, fixed voltage be poor, voltage regulation coefficient and
Voltage threshold；
Based on first initial value, following determining step is executed：First initial value is added and subtracted respectively is described solid
The corresponding voltage value of constant voltage difference, obtains the first voltage value and second voltage value；The display panel is obtained at the beginning of described first
Panel flash value under initial value, the first voltage value and the second voltage value obtains the first initial scintillation value, the first flicker
Value and the second flicker value；Judge the first initial scintillation value whether and meanwhile less than first flicker value and it is described second flicker
Value；If so, using the common voltage corresponding to first flicker value and second flicker value as the limit of value range
Value；Otherwise, by the common voltage corresponding to the minimum value in the first initial scintillation value, the first flicker value and the second flicker value
As the first initial value, the determining step is executed again；
On-fixed voltage difference is determined according to the fixed voltage difference and the voltage regulation coefficient, and is pressed in the value range
The common voltage is adjusted according to the on-fixed voltage difference, and is got in the process based on being adjusted in the on-fixed voltage difference
The common voltage met corresponding to the panel flash value of the second predetermined condition, determine the end value of the common voltage.
8. driving method according to claim 7, which is characterized in that described according to the fixed voltage difference and preset electricity
Pressure adjustment factor determines on-fixed voltage difference, and described public according to on-fixed voltage difference adjustment in the value range
Voltage, and based on the panel flash value for meeting the second predetermined condition detected in the process in on-fixed voltage difference adjustment
Corresponding common voltage determines that the end value of the common voltage includes：
The midpoint of the value range is determined as to the second initial value of the common voltage；
The fixed voltage difference is multiplied by the voltage regulation coefficient, obtains initial voltage difference, wherein the voltage regulation coefficient
More than 0 and it is less than 1；
Based on second initial value, executes following end value and determine step：
Second initial value is added and subtracted respectively the initial voltage difference, obtains third voltage value and the 4th voltage value；
Panel of the display panel under second initial value, the third voltage value and the 4th voltage value is obtained to dodge
Bright value, obtains the second initial scintillation value, third flicker value and the 4th flicker value；
Judge whether the initial voltage difference is less than or equal to the voltage threshold；
If so, by public corresponding to the minimum value in the second initial scintillation value, third flicker value and the 4th flicker value
Voltage is as the end value；
Otherwise, using the corresponding common voltage of the minimum value as the second initial value, the initial voltage difference and the voltage tune
The product of coefficient is saved as initial voltage difference, the end value is executed again and determines step.
9. driving method according to claim 8, which is characterized in that the voltage regulation coefficient is more than or equal to 0.5.
10. driving method according to any one of claims 7 to 9, which is characterized in that the panel flash value is described aobvious
Show flicker value of the panel when showing predetermined grayscale.
11. driving method according to claim 10, which is characterized in that the panel flash value is examined by photoelectric sensor
It measures.
12. driving method according to any one of claims 7 to 9, which is characterized in that further include：
Display signal is provided for the display panel.
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| CN105807458B (en) * | 2016-05-20 | 2021-02-26 | 京东方科技集团股份有限公司 | Burning detection method and device for common voltage of liquid crystal display panel |
| CN106531113B (en) * | 2017-01-03 | 2019-05-03 | 京东方科技集团股份有限公司 | A kind of display panel, drive circuit and its driving method, display device |
| CN106991989B (en) * | 2017-05-26 | 2019-09-20 | 青岛海信电器股份有限公司 | A kind of method of adjustment and device of common electric voltage of LCD panel |
| CN106990570A (en) * | 2017-05-27 | 2017-07-28 | 南京中电熊猫平板显示科技有限公司 | The most suitable common electric voltage measuring method and device of liquid crystal panel |
| CN107248400B (en) * | 2017-08-03 | 2018-01-16 | 深圳市华星光电半导体显示技术有限公司 | The driving method and voltage-regulating circuit of a kind of liquid crystal display panel |
| CN108182922B (en) * | 2018-01-09 | 2020-08-04 | 昆山龙腾光电股份有限公司 | Common voltage adjusting device, adjusting method and liquid crystal display device |
| CN109147697A (en) * | 2018-09-05 | 2019-01-04 | 捷星显示科技（福建）有限公司 | A kind of method of the fast automatic adjustment LCM VCOM value of complete machine state |
| CN109036255A (en) * | 2018-09-30 | 2018-12-18 | 厦门天马微电子有限公司 | A kind of display driving method, display drive apparatus and display equipment |
| CN110349551B (en) * | 2019-07-25 | 2021-07-02 | 重庆惠科金扬科技有限公司 | Pixel driving circuit, pixel driving method and manufacturing method of display panel |
| CN110599935B (en) * | 2019-08-26 | 2023-01-24 | 昆山龙腾光电股份有限公司 | Automatic adjusting device and automatic adjusting method for public voltage |
| CN110890074B (en) * | 2019-10-30 | 2022-10-28 | 华显光电技术（惠州）有限公司 | Display screen public voltage adjusting method and display screen |
| CN111369925B (en) * | 2020-04-26 | 2023-02-28 | 成都京东方显示科技有限公司 | VCOM debugging method, device, system and storage medium of display panel |
| CN112102769B (en) * | 2020-10-28 | 2022-09-20 | 业成科技（成都）有限公司 | Display screen common voltage adjusting method and device, computer equipment and storage medium |
| CN113112939B (en) * | 2021-04-02 | 2023-10-17 | 深圳市华星光电半导体显示技术有限公司 | Voltage compensation method and device for display device and display device |
| CN113674713B (en) * | 2021-08-20 | 2023-07-18 | 京东方科技集团股份有限公司 | Method and device for improving screen flicker and display device |
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