CN108305591A - Display control method and display device - Google Patents
Display control method and display device Download PDFInfo
- Publication number
- CN108305591A CN108305591A CN201810146037.3A CN201810146037A CN108305591A CN 108305591 A CN108305591 A CN 108305591A CN 201810146037 A CN201810146037 A CN 201810146037A CN 108305591 A CN108305591 A CN 108305591A
- Authority
- CN
- China
- Prior art keywords
- voltage
- continuously display
- display time
- tft
- target drives
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
Abstract
An embodiment of the present invention provides a kind of display control method and display device, the method includes：Set the present drive voltage of thin film transistor (TFT) TFT to initial boost voltage；Detect the continuously display time of current frame image；Determine corresponding target drives voltage of the continuously display time；According to the target drives voltage, present drive voltage is adjusted.The variation that the method passes through the continuously display time of detection current frame image, determine corresponding target drives voltage, and further the present drive voltage of TFT is adjusted according to the target drives voltage, the number of present drive voltage can be increased, so as to reduce the drift of TFT, and thus caused image retention.
Description
Technical field
The present invention relates to technical field of liquid crystal display, specifically, the present invention relates to a kind of display control method and displays
Device.
Background technology
Liquid crystal display is with its low-work voltage, low-power consumption, Low emissivity, low spatial occupation rate and frivolous beauty in recent years
Etc. advantages, it is constantly universal, it has also become the mainstream in market.It is right with the level of understanding of people and the continuous improvement to display requirement
Also proposed increasingly higher demands in the image quality of display, and in terms of the image quality of liquid crystal display currently on the market there is also
Following problem：
When TFT-LCD (Thin Film Transistor-Liquid Crystal Display, tft liquid crystal
Display) when showing same secondary picture for a long time, because liquid crystal is driven by prolonged Dc bias, cause liquid crystal molecule cannot
It is normally deflected under the control of signal voltage, and then picture is made to generate image retention, that is, after changing the image for showing picture, on screen still
So it can be seen that the trace of the static image of previous time.
Invention content
The present invention is directed to the shortcomings that existing mode, proposes a kind of display control method and display device, existing to solve
Have in technology, liquid crystal display is shown for a long time leads to the problem of image retention when the same painting face image.
The embodiment of the present invention provides a kind of display control method according on one side, including：
Set the present drive voltage of thin film transistor (TFT) TFT to initial boost voltage；
Detect the continuously display time of current frame image；
Determine corresponding target drives voltage of the continuous display time；
According to the target drives voltage, present drive voltage is adjusted.
Further, it is determined that go out corresponding target drives voltage of the continuously display time, including：
The continuously display time is compared at least one preset time, whether judges the continuously display time
More than any one of preset time, if so, determining corresponding target drives voltage of the continuously display time；
According to the target drives voltage, present drive voltage is adjusted, including：According to target drives electricity
Pressure, the standoff voltage Vgl current to the TFT are adjusted.
Further, described to judge whether the continuously display time is more than any one of preset time；If so,
Determine corresponding target drives voltage of the continuously display time, including：
Judge whether the continuously display time is more than the first preset time, if so, determining the target drives electricity
Pressure is first object driving voltage；Otherwise, then judge whether the continuously display time is more than the second preset time.
Further, described to judge whether the continuously display time is more than any one of preset time；If so,
It determines corresponding target drives voltage of the continuously display time, further includes：
If judging, the continuously display time is more than the second preset time, it is determined that it is the to go out the target drives voltage
Two target drives voltages；Otherwise, then judge whether the continuously display time is more than third preset time.
Further, described to judge whether the continuously display time is more than any one of preset time；If so,
It determines corresponding target drives voltage of the continuously display time, further includes：
If judging, the continuously display time is more than third preset time, it is determined that it is the to go out the target drives voltage
Three target drives voltages.
Further, the method further includes：
When judge the continuously display time be less than or equal to first preset time, and detect switch to it is next
When frame image is shown, the image difference value between the next frame image and the current frame image is determined；
Judge whether described image difference value is more than preset image difference threshold, if so, the TFT is worked as forerunner
Dynamic voltage is adjusted to the initial boost voltage, from the beginning determines the continuously display time of the next frame image.
Further, the method further includes：
If described image difference value is less than or equal to described image discrepancy threshold, by persistently showing for the next frame image
Show in time cumulation to the continuously display time of the current frame image.
The embodiment of the present invention additionally provides a kind of display device, including the electricity being sequentially connected electrically according on the other hand
Press setting module, time detection module, voltage determination module and VRM Voltage Regulator Module；
The voltage setting module, for setting the present drive voltage of thin film transistor (TFT) TFT to initial boost voltage；
The time detection module, the continuously display time for detecting current frame image；The voltage determination module, for determining
State corresponding target drives voltage of continuously display time；The VRM Voltage Regulator Module is used for according to the target drives voltage, right
Present drive voltage is adjusted.
Further, the VRM Voltage Regulator Module includes：Signal input part, feedback voltage adjust unit, driving voltage tune
Save unit, first resistor and signal output end；
The first end that the feedback voltage adjusts unit is electrically connected with the signal input part, second end and driving electricity
Pressure adjusts the first end electrical connection of unit, third end ground connection；The second end of the driving voltage adjusting unit and the signal are defeated
Outlet is electrically connected；The first resistor is in parallel with driving voltage adjusting unit；
It is corresponding with the target drives voltage for being received by the signal input part that the feedback voltage adjusts unit
Control signal, corresponding feedback voltage signal is generated according to the control signal, and the feedback voltage signal is transmitted to
The driving voltage adjusts unit；The driving voltage adjusts unit, corresponding for being generated according to the feedback voltage signal
Drive voltage signal after adjusting, and exported by the signal output end.
Further, it includes at least one set of adjusting circuit that the feedback voltage, which adjusts unit, and every group of adjusting circuit includes：
Amplifier, switching device and second resistance；
The anode of the amplifier is electrically connected with the signal input part, and the first end of cathode and the switching device is electrically connected
It connects；First pole of the switching device is electrically connected with the first end of the second resistance, the second pole ground connection of the switching device；
The second end of the second resistance adjusts unit with the driving voltage and the first resistor is both electrically connected with；
The amplifier, for being amplified processing to the control signal inputted by the signal input part；The switch
Device, for opening or closing under the control of said control signal, to organize the break-make for adjusting circuit belonging to realization.
The embodiment of the present invention compared with prior art, at least has the advantages that：
1) by detecting the variation of the continuously display time of current frame image, corresponding target drives voltage, and root are determined
Further the present drive voltage of TFT is adjusted according to the target drives voltage, the number of present drive voltage can be increased,
So as to reduce the drift of TFT, and thus caused image retention；
2) by the judgement to image difference value, processing appropriate can be made to next frame image according to different situations, when
When image difference value is smaller, by the continuously display continuously display time for being accumulated to current frame image of next frame image, continue
Present drive voltage is adjusted, to improve the image retention of current frame image initiation；When image difference value is larger, then individually count
It calculates the continuously display time of next frame image, and according to the continuously display time, adjusts the current driving electricity under next frame image
Pressure, to improve the image retention of next frame image initiation；
3) according to and target drives voltage control signal, corresponding FB voltages are exported using VRM Voltage Regulator Module, go forward side by side one
Step section and export corresponding drive voltage signal, may be implemented based on the continuously display time to TFT present drive voltages
It adjusts.
The additional aspect of the present invention and advantage will be set forth in part in the description, these will become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, wherein：
Fig. 1 is the picture image schematic diagram before image switching during the image retention of the present invention is tested.
Fig. 2 is the picture image schematic diagram after image switching during the image retention of the present invention is tested.
Fig. 3 is the TFT Character Comparison figures in the regions a and the regions b in Fig. 2.
Fig. 4 is the TFT Character Comparisons carried out to TFT in the present invention under the different Vgs that high temperature negative polarity bias is tested
Figure.
Fig. 5 is a kind of flow diagram for display control method that the embodiment of the present invention one provides.
Fig. 6 is the flow diagram of another display control method provided by Embodiment 2 of the present invention.
Fig. 7 is the flow diagram of a specific example of display control method provided by Embodiment 2 of the present invention.
Fig. 8 is a kind of structural schematic diagram for display device that the embodiment of the present invention three provides.
Fig. 9 is a kind of structural schematic diagram for VRM Voltage Regulator Module that the embodiment of the present invention three provides.
Figure 10 is a kind of work wave schematic diagram for VRM Voltage Regulator Module that the embodiment of the present invention three provides.
Figure 11 is the structural schematic diagram for another display device that the embodiment of the present invention four provides.
Specific implementation mode
Image retention is TFT-LCD (Thin Film Transistor-Liquid Crystal Display, thin film transistor (TFT)
Liquid crystal display) a kind of display characteristic, be mainly shown as when liquid crystal display for a long time show the same picture, picture
When being switched to next picture, original picture can remain in next picture.In the evolution of TFT-LCD, image retention
Problem affects the picture quality of TFT-LCD for a long time, especially long-term picture quality.
In order to solve image retention problem, the present inventor has carried out image retention test.Fig. 1 and Fig. 2 respectively illustrate with
When carrying out image retention test to TFT-LCD for GOA (Gate Driver On Array, the driving of array substrate row) product, obtain
First latter two image retention test pictures；Wherein, Fig. 1 is the picture image before switching, and Fig. 2 is the picture image after switching.Switching
L127 pictures afterwards, the regions a and the regions b should be in the display of same grayscale, and brightness is identical, but in fig. 2, the regions a and b
There are notable differences for the brightness in region, form image retention.Above-mentioned L127 is luminance parameter, indicates that brightness or gray scale are 127th etc.
Grade.
To be best understood from the Forming Mechanism of image retention, the present inventor to after image switching the regions a and the regions b
TFT characteristics have carried out research and analysis, and for LCD products, scan mode progressively scans for grid, to black square and white square TFT
For, the only time of 1/768 frame is in open state, and the time of 767/768 frame is closed, therefore negligible TFT
The influence of on-state voltage Vgh only considers standoff voltage Vgl (- 8V) influence to TFT characteristics, i.e., when only considering Vgl=-8V
The variation of drain-source current Ids.
Above-mentioned relevant parameter meaning is as follows：On-state voltage Vgh is Vgatehigh, indicates the height electricity of TFT gate (gate)
The voltage of grid is opened in position, TFT is in ON state (conducting state) when reaching this voltage；Standoff voltage Vgl is Vgatelow,
It indicates the low potential of the grid of TFT, that is, closes the voltage of grid, TFT is in OFF state (cut-off state) when reaching this voltage；Drain-source
Electric currents of the electric current Ids between TFT drain (drain) and source electrode (source) should be theoretically when TFT is in OFF state
Ids=0, but can actually have drain-source current Ids.
The TFT Character Comparison figures in the regions a and the regions b after the shown image switchings of Fig. 3, the dotted line in Fig. 3 indicate the areas a
The TFT characteristics in domain, chain-dotted line indicate that the TFT characteristics in the regions b, abscissa indicate that the standoff voltage Vgl of TFT, ordinate indicate TFT
Drain-source current Ids.
When as seen from Figure 3, between abscissa Vgl=-10V~-6V, the regions a and the regions b of picture after switching
Ids differences are maximum, i.e. the regions a and the regions b the TFT property differences in Vgl=-10V~-6V are maximum；At same Vgl, due to a
Region is different with the Ids in the regions b, and pixel electric leakage is different, and then VHR (voltage holding ratio, the voltage in two regions
Conservation rate) it is also different, the brightness for eventually resulting in the regions a and the regions b has differences, to form image retention.
For black and white lattice TFT, whens TFT closed states, can consider that DS pressure differences (drain electrode and source electrode pressure difference) are 0V, in vain
The pixel voltage Vpixel (the source voltage Vs of TFT) of lattice is in 0V and 16V saltus steps (positive and negative frame overturning, respectively account for 50% duration),
The pixel voltage Vpixel of black square is then approximately at always 8V states.Gate source voltage (or grid bias) Vgs=Vg- of TFT
Vs, in the case where not considering Vgh, grid voltage Vg is equal with Vgl, thus can release Vgs=Vgl-Vs, when only considering Vgl
It when the influence of=- 8V, can be calculated, when the Vpixel of white square in image retention experiment is in 0V and 16V saltus steps, white square TFT is practical
On the Vgs for alternately bearing -8V and -24V influence (respectively accounting for 50% duration)；When the Vpixel of black square in image retention experiment is approximately
When 8V, black square TFT is then actually in the influence for the Vgs for bearing approximation -16V.
The present inventor further to TFT carried out NBTPS tests (high temperature negative polarity bias test,
Negative Bias Temperature Photo Stress Test), the test under conditions of approximate practical driving into
Row, for testing influences of the difference Vgl to TFT characteristics under same drain-source voltage Vds, which can be used for evaluating the stabilization of TFT
Property, it is ensured that the reliability of product.Above-mentioned drain-source voltage Vds is the voltage between the drain electrode and source electrode of TFT, and corresponding electric current is leakage
Ource electric current Ids.
NBTPS test specific test condition be：Illumination 5000nit (nit), 25 DEG C of temperature, testing time 2hr
(hour, hour)；Wherein, nit is brill, 1nit=1cd/m2(candela/square metre).After the test of 2hr
The TFT Character Comparison figures under different Vgs as shown in Figure 4 are arrived, and Fig. 4 is listed when Vds is 15V, 8V respectively under difference Vgs
TFT characteristic curves, wherein the numerical value of Vds and Vgs is not shown in the coordinate of Fig. 4.
Four TFT characteristic curves in Fig. 4 are respectively from top to bottom：Vds is that the TFT characteristics of 15V, Vgs in -16V are bent
Line (long dotted portion is called in the following text " first curve "), the TFT characteristics of Vds 15V, Vgs between -8V and -24V when saltus step are bent
Line (chain-dotted line part is called in the following text " Article 2 curve "), Vds 8V, Vgs be -16V when TFT characteristic curves (bold portion, under
Claim " Article 3 curve "), (short dash line part, is called in the following text the TFT characteristic curves of Vds 8V, Vgs between -8V and -24V when saltus step
" Article 4 curve ").
Preceding two curves are compared it is found that the ordinate value of first curve can deduce more than Article 2 curve in Vds=
When 15V, when Vgs is in -8V and -24V saltus steps, (off-state current of TFT, i.e. TFT are in the leakage under OFF state state to leakage current Ioff
Ource electric current Ids) it is relatively small, therefore TFT drifts are relatively small, when Vgs is -16V, Ioff is relatively large, therefore TFT drifts about
It is relatively large；Similarly, after comparison two curves it is found that Article 3 curve ordinate value be more than Article 4 curve, can deduce
When Vds=8V, when Vgs is in -8V and -24V saltus steps, Ioff is relatively small, therefore TFT drifts are relatively small, when Vgs is -16V
When, Ioff is relatively large, therefore TFT drifts are relatively large.
Based on the above analysis, inventor has found that the influence under the same Vgs to TFT characteristics is bigger, it is easier to be formed residual
Picture, influences of the different Vgs to TFT characteristics are smaller, it is easier to reduce image retention.Can further it deduce, when a picture image is in length
When Vgl does not change or varies less during time showing, corresponding Vgs does not also change or varies less, this
When be very easy to result in image retention.
Based on above-mentioned discovery, the present inventor proposes a kind of display control method and display device of picture, works as inspection
It is same in display to increase TFT by the corresponding standoff voltage Vgl of timing adjustment when measuring LCD long-time display same pictures
Vgs when picture can saltus step number, to reduce the image retention generated by TFT characteristic drifts.
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that is used in the specification of the present invention arranges
It refers to there are the feature, integer, step, operation, element and/or component, but it is not excluded that presence or addition to take leave " comprising "
Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member
Part is " connected " or when " coupled " to another element, it can be directly connected or coupled to other elements, or there may also be
Intermediary element.In addition, " connection " used herein or " coupling " may include being wirelessly connected or wirelessly coupling.It is used herein to arrange
Diction "and/or" includes that the whole of one or more associated list items or any cell are combined with whole.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific terminology), there is meaning identical with the general understanding of the those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, it should be understood that have in the context of the prior art
The consistent meaning of meaning, and unless by specific definitions as here, the meaning of idealization or too formal otherwise will not be used
To explain.
Embodiment one
In order to solve the image retention caused by the number of Vgs is very few, the embodiment of the present invention one provides a kind of display control
Method.The flow diagram of this method is as shown in figure 5, include：
S101 sets the present drive voltage of thin film transistor (TFT) TFT to initial boost voltage；
S102 detects the continuously display time of current frame image；
S103 determines continuously display time corresponding target drives voltage；
S104 is adjusted present drive voltage according to the target drives voltage.
Using the embodiment of the present invention, the variation of the continuously display time by detecting current frame image determines corresponding mesh
Driving voltage is marked, and further the present drive voltage of TFT is adjusted according to the target drives voltage, can be increased current
The number of driving voltage, the increase of present drive voltage number causes the increase of Vgs number, so as to reduce the drift of TFT,
And thus caused by image retention.
The technical solution of the embodiment of the present invention one is described in detail below：
In step S101, the present drive voltage of TFT is the standoff voltage Vgl of TFT, by the current driving electricity of TFT
Pressure is set as initial boost voltage, and using the initial boost voltage as the principal voltage of driving voltage, can fix driving voltage
In a voltage, driving voltage is avoided to switch between multiple voltages, to not be to show same picture image for a long time in LCD
When, power consumption can be effectively saved.
Set the present drive voltage of TFT to initial boost voltage, concrete mode is as follows：The initial control letter of setting
Number, corresponding Vgl is exported under the control of the initial control signal, as initial boost voltage.
Before step S102, current frame image can also be stored, convenient for subsequently handling the image.
In step s 102, it is preferable that the continuously display time can be indicated by the time, such as the continuously display time is 10
Minute；Can also the setting unit time, the quantity of lasting unit interval directly indicates when being shown by image, such as persistently shows
Show that the time is 36000 unit interval.
When the continuously display time by the time come when indicating, it is further preferred that step S102 includes：Detect present frame figure
When as starting display, the quantity of counter records unit interval is utilized；Temporal summation is determined according to unit interval and its quantity,
The continuously display time as current frame image.The continuously display time can be accurately detected through the above way.
When the continuously display time by the quantity of lasting unit interval come when indicating, it is further preferred that step S102
Including：When detecting that current frame image starts display, the quantity of counter records unit interval is utilized.By the above-mentioned means, energy
It is enough more efficiently to detect the continuously display time, while because reducing calculating step, power consumption can be further reduced.
Preferably, step S103 includes：The continuously display time is compared at least one preset time, judges to continue
Show whether the time is more than any one preset time, if so, determining corresponding target drives voltage of continuously display time.
Accordingly with step S102, the preset time in step S103 can be expressed as specific time value, can also table
It is shown as the quantity of a certain unit interval.
When more than one preset time is arranged, the present invention is not construed as limiting the sequence for comparing and judging, can be according to default
The size of time is judged that particular order can be according to the reality of user according to descending or ascending sequence successively
Border demand is configured.
The embodiment of the present invention is not restricted the quantity of preset time, i.e., is not limited to the number of judgement；Preset time
Quantity it is more, judge that number is more, the number for obtaining driving voltage is more, be more conducive to improve damaged picture, concrete numerical value
It can flexibly be set according to actual demand and restrictive condition.
The embodiment of the present invention is not also restricted the length of preset time, can be flexible according to actual design pattern and demand
Setting.
When the continuously display time by the quantity of lasting unit interval come when indicating, preset time also can be by preset list
The quantity of position time indicates.
In a preferred embodiment, it is contemplated that three preset times are arranged in power consumption requirements, execute deterministic process three times,
It is as follows：
First determine whether the continuously display time is more than the first preset time, if so, determining that target drives voltage is
First object driving voltage；Otherwise, then judge whether the continuously display time is more than the second preset time；
If judging, the continuously display time is more than the second preset time, it is determined that it is the second target to go out target drives voltage
Driving voltage；Otherwise, then judge whether the continuously display time is more than third preset time.
If judging, the continuously display time is more than third preset time, it is determined that it is third target to go out target drives voltage
Driving voltage.
Preset time is set as three, relative to the situation less than three preset times, advantage is：Can carry out
Judge more times, the number for increasing target drives voltage effectively improves the image retention of picture to increase the number of Vgs；Relatively
In more than three situations, advantage is：Vgs switchings are avoided excessively frequently to cause power consumption excessive.Meeting power consumption requirements
Under the premise of, which can farthest increase the number of Vgs, to farthest improve the residual of picture
Picture.
According to the actual demand of user, under the premise of meeting actual power consumption requirements, can also set preset time to
Other quantity.
When judge the continuously display time be more than multiple preset times in the maximum preset time, determine the maximum preset when
Between corresponding target drives voltage, and when not detecting next frame image, the embodiment of the present invention may also include：Return to step
S101 recirculates above steps.
Preferably, it is specifically included in step S104：Corresponding control signal is generated according to target drives voltage, controls signal
Control generates corresponding drive voltage signal, and present drive voltage is adjusted to the drive voltage signal pair by initial boost voltage
The driving voltage answered.
Embodiment two
Based on identical inventive concept, second embodiment of the present invention provides a kind of display control methods.The flow of this method
As shown in fig. 6, on the basis of the S101-S104 of the embodiment of the present invention one, this method further includes schematic diagram：
S105, when judge the continuously display time be less than or equal to the first preset time, and detect switch to it is next
When frame image is shown, the image difference value between the next frame image and the current frame image is determined；
S106, judges whether the image difference value is more than preset image difference threshold；If so, regarding next frame image with
Above-mentioned current frame image is different image, executes step S101；If it is not, then can be ignored difference, depending on next frame image with it is above-mentioned
Current frame image is same image, executes step S107.
Step S107, detects the continuously display time of the next frame image, and by the next frame image it is continuously display when
Between be accumulated in the continuously display time of current frame image, execute step S103
S106 through the above steps can readjust the present drive voltage of TFT as initial boost voltage, under above-mentioned
One frame image from the beginning determines persistently showing for above-mentioned next frame image as new current frame image (current frame image at the moment)
Show the time；
Next frame image and current frame image, can be considered as same image by S107 through the above steps, and by next frame figure
In the continuously display time cumulation of picture to the continuously display time of above-mentioned current frame image, it is equivalent in lasting detection present frame figure
The continuously display time of picture.
By the judgement to image difference value, processing appropriate can be made to next frame image according to different situations, work as figure
When smaller as difference value, by the continuously display continuously display time for being accumulated to current frame image of next frame image, Ke Yijin
One step increases Vgs number of current frame image, preferably improves the image retention that current frame image causes；When image difference value is larger
When, then the continuously display time of next frame image is individually calculated, and according to the continuously display time, increase next frame image
Vgs number, to improve the image retention of next frame image initiation.
The embodiment of the present invention is not construed as limiting the concrete numerical value of preset image difference threshold, and usual numerical value is smaller to be more conducive to
The difference of two field pictures is accurately distinguished, but the smaller number from the beginning recycled of numerical value is also more simultaneously, can increase power consumption；Actually answering
In, can suitable numerical value be set according to the demand of actual accuracy and power consumption.
Fig. 7 shows a specific example of above-mentioned display control method, specifically comprises the following steps：
1) assignment Y0=1, Y1=0, Y2=0 inputs initial control signal, makes VGL=VGL0, thus by the current of TFT
Driving voltage VGL is adjusted to initial boost voltage VGL0；
2) counter increases by 1 unit interval；
3) judge whether counter is more than 54000 unit interval；
If more than 54000 unit interval, then assignment Y0=1, Y1=0, Y2=0, inputs first control signal, makes VGL
=VGL0, to which the present drive voltage VGL of TFT is adjusted to VGL0；
If being less than or equal to 54000 unit interval, when judging whether the continuously display time is more than 36000 units
Between；
If more than 36000 unit interval, then assignment Y0=0, Y1=1, Y2=0, inputs second control signal, makes VGL
=VGL1, to which the present drive voltage VGL of TFT is adjusted to VGL1；
If being less than or equal to 36000 unit interval, judge whether the continuously display time is more than 18000；
If more than 18000, then assignment Y0=0, Y1=0, Y2=1, inputs third and controls signal, make VGL=VGL2, to
The present drive voltage VGL of TFT is adjusted to VGL2.
4) it is less than or equal to 54000 when the above-mentioned continuously display time, and detects that switching to next frame image is shown
When, determine the image difference value between next frame image and current frame image；
5) judge whether image difference value is more than 20%；
If so, counter O reset, returns to step 1), using next frame image as new current frame image, from the beginning determine
The continuously display time of above-mentioned next frame image；
If it is not, returning to step 5), the continuously display time of next frame image is detected, and the continuously display time cumulation is arrived
In the continuously display time of current frame image.
Embodiment three
Accordingly with embodiment one, the embodiment of the present invention three provides a kind of display device.The structure of the display device is shown
Be intended to as shown in figure 8, including sequentially connected voltage setting module 401, time detection module 402, voltage determination module 403 with
And the VRM Voltage Regulator Module 404 as described in embodiment three.
The voltage setting module 401, for setting the present drive voltage of TFT to initial boost voltage；And it specifically uses
In：The initial control signal for setting VRM Voltage Regulator Module 404, exports corresponding Vgl under the control of the initial control signal, makees
For initial boost voltage.
The voltage setting module 401, using the initial boost voltage as the principal voltage of driving voltage, with fixed driving voltage
Principal voltage, can switch in multiple voltage values to avoid driving voltage, to not be to show the same painting face for a long time in LCD
When, it is effectively saved power consumption.
The time detection module 402, the continuously display time for detecting current frame image；And it is specifically used for：It detects
When current frame image starts display, using the quantity of counter records unit interval, and/or, according to unit interval and its quantity
Determine temporal summation, the continuously display time as current frame image.
The voltage determination module 403, for determining corresponding target drives voltage of continuously display time；And it is specifically used for：
The continuously display time is compared at least one preset time, judges whether the continuously display time is default more than any one
Time, if so, determining corresponding target drives voltage of continuously display time.
In a preferred embodiment, which is specifically used for：
First determine whether the continuously display time is more than the first preset time, if so, determining that target drives voltage is
First object driving voltage；Otherwise, then judge whether the continuously display time is more than the second preset time；
If judging, the continuously display time is more than the second preset time, it is determined that goes out target drives voltage and is driven for the second target
Dynamic voltage；Otherwise, then judge whether the continuously display time is more than third preset time.
If judging, the continuously display time is more than third preset time, it is determined that goes out target drives voltage and is driven for third target
Dynamic voltage.
The VRM Voltage Regulator Module 404, for according to target drives voltage, present drive voltage to be adjusted；And it is specific
For：According to the corresponding control signal of target drives voltage, corresponding drive voltage signal is generated, by present drive voltage by first
Beginning driving voltage is adjusted to the corresponding driving voltage of the drive voltage signal.
In a preferred embodiment, which includes：Signal input part, feedback voltage adjust unit,
Driving voltage adjusts unit, first resistor and signal output end；Fig. 9 shows that a kind of structure of the VRM Voltage Regulator Module 404 is shown
It is intended to.
The first end that the feedback voltage adjusts unit is electrically connected with the signal input part, and second end is adjusted with the driving voltage
The first end of unit is electrically connected, third end ground connection；The second end that the driving voltage adjusts unit is electrically connected with the signal output end；
The first resistor is in parallel with driving voltage adjusting unit；
The feedback voltage adjusts unit and is used to receive control corresponding with the target drives voltage by the signal input part
Signal generates corresponding feedback voltage (FB voltages) signal according to the control signal, and the feedback voltage signal is transmitted to drive
Dynamic voltage regulation unit；The driving voltage adjusts unit, for generating the drive after corresponding adjusting according to the feedback voltage signal
Dynamic voltage signal, and exported by the signal output end.
Preferably, which includes at least one input port, Y0, Y1 and Y2 as shown in Figure 9.It is driven with initial
Dynamic voltage or the corresponding control signal of target drives voltage are by the signal input part input voltage regulation module 404.
Preferably, it includes at least one set of adjusting circuit which, which adjusts unit, and every group of adjusting circuit includes：Amplification
Device, switching device and second resistance (resistance R0, R1 or R2 as shown in Figure 7)；
The anode of the amplifier is electrically connected with signal input part, and cathode is electrically connected with the first end of the switching device；This is opened
The first pole for closing device is electrically connected with the first end of second resistance, the second pole ground connection of the switching device；The of the second resistance
Two ends adjust unit with driving voltage and first resistor is both electrically connected with.
The amplifier, for being amplified processing to the control signal inputted by the signal input part；The switching device is used
In opening or closing under control of the control signal, to organize the break-make for adjusting circuit belonging to realization.
First resistor (resistance R as shown in Figure 9) and second resistance are divider resistance.
A variety of diode or triodes can be selected in the switching device, when selection NMOS tube (metal-oxidation as shown in Figure 9
Object-semiconductor field effect transistor) when, the grid of NMOS tube is the control terminal of switching device, and it is the first of switching device to drain
Pole, source electrode are the second pole of switching device.
The driving voltage adjusts unit and BUCK circuits (Buck conversion circuit) as shown in Figure 9 can be selected.
The operation principle of the VRM Voltage Regulator Module 404 is, by signal input part assignment, input and target drives voltage
Corresponding control signal, to adjust the size of FB voltages, the size by adjusting FB voltages further controls the output of VGL.
With reference to the working waveform figure of VRM Voltage Regulator Module 404 shown in Fig. 10, voltage provided in an embodiment of the present invention is adjusted
The course of work of module 404 is specific as follows：
As assignment Y0=1, Y1=0, Y2=0, that is, first control signal is had input, first control signal passes through amplifier
Amplification, control NMOS tube M0 opens, and M1 and M2 are closed；At this point, only resistance R0 and GND are in the conduction state to get arriving
Corresponding FB voltages；At this point, FB voltages and VGL voltages have following operation relation：FB=VGL × R0/ (R0+R), BUCK circuits
According to the FB voltages and above-mentioned operation relation, can generate and by the present drive voltage VGL=VGL0 of the corresponding TFT of output；
As assignment Y0=0, Y1=1, Y2=0, that is, second control signal is had input, second control signal passes through amplifier
Amplification, control NMOS tube M1 opens, and M0 and M2 are closed；At this point, only resistance R1 and GND is in the conduction state, obtain pair
The FB voltages answered；At this point, FB voltages and VGL voltages have following operation relation：FB=VGL × R1/ (R1+R), BUCK circuit root
According to the FB voltages and above-mentioned operation relation, can generate and by the present drive voltage VGL=VGL1 of the corresponding TFT of output；
As assignment Y0=0, Y1=0, Y2=1, that is, third control signal is had input, third controls signal and passes through amplifier
Amplification, control NMOS tube M2 opens, and M0 and M1 are closed；At this point, only resistance R2 and GND is in the conduction state, obtain pair
The FB voltages answered；At this point, FB voltages and VGL voltages have following operation relation：FB=VGL × R2/ (R2+R), BUCK circuit root
According to the FB voltages and above-mentioned operation relation, can generate and by the present drive voltage VGL=VGL2 of the corresponding TFT of output.
It, can be according to control corresponding with target drives voltage using VRM Voltage Regulator Module 404 provided in an embodiment of the present invention
Signal processed exports corresponding FB voltages, and the adjusting further across BUCK circuits exports corresponding drive voltage signal, to realize
TFT present drive voltages are adjusted.
The advantageous effect that the embodiment of the present invention three can reach is identical as embodiment one, and details are not described herein.
Example IV
Accordingly with embodiment two, the embodiment of the present invention four provides a kind of display device.The structural schematic diagram of the device
As shown in figure 11, on the basis of the embodiment of the present invention three, which further includes the image difference determining module being electrically connected to each other
405 and image difference judgment module 406, image difference determining module 405 be also electrically connected with VRM Voltage Regulator Module 404, image difference
Different judgment module 406 is also electrically connected with voltage setting module 401, time detection module 402.
The image difference determining module 405 judges that the continuously display time is less than or equal to the first preset time for working as,
And when detecting that switching to next frame image is shown, determine the image difference between next frame image and current frame image
Value.
The image difference judgment module 406, for judging whether the image difference value is more than preset image difference threshold；
If so, control voltage setting module 401 executes step S101, the present drive voltage of TFT is adjusted to initially
From the beginning driving voltage determines the continuously display time of above-mentioned next frame image using next frame image as new current frame image；
If it is not, then control time detection module 402 executes step S102, the next frame image (present frame at the moment is detected
Image) the continuously display time, and control time detection module 402 by the continuously display time cumulation of next frame image to current
In the continuously display time of frame image.
The advantageous effect that the embodiment of the present invention four can reach is identical as embodiment two, and details are not described herein.
Those skilled in the art of the present technique be appreciated that can with computer program instructions come realize these structure charts and/or
The combination of each frame and these structure charts and/or the frame in block diagram and/or flow graph in block diagram and/or flow graph.This technology is led
Field technique personnel be appreciated that these computer program instructions can be supplied to all-purpose computer, special purpose computer or other
The processor of programmable data processing method is realized, to pass through the processing of computer or other programmable data processing methods
Device come execute structure chart and/or block diagram and/or flow graph disclosed by the invention frame or multiple frames in specify scheme.
Those skilled in the art of the present technique are appreciated that in the various operations crossed by discussion in the present invention, method, flow
Steps, measures, and schemes can be replaced, changed, combined or be deleted.Further, each with having been crossed by discussion in the present invention
Other steps, measures, and schemes in kind operation, method, flow may also be alternated, changed, rearranged, decomposed, combined or deleted.
Further, in the prior art to have and step, measure, the scheme in various operations, method, flow disclosed in the present invention
It may also be alternated, changed, rearranged, decomposed, combined or deleted.
The above is only some embodiments of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of display control method, which is characterized in that including：
Set the present drive voltage of thin film transistor (TFT) TFT to initial boost voltage；
Detect the continuously display time of current frame image；
Determine corresponding target drives voltage of the continuously display time；
According to the target drives voltage, present drive voltage is adjusted.
2. according to the method described in claim 1, it is characterized in that, determining corresponding target drives of the continuously display time
Voltage, including：
The continuously display time is compared at least one preset time, judges whether the continuously display time is more than
Any one of preset time, if so, determining corresponding target drives voltage of the continuously display time；
According to the target drives voltage, present drive voltage is adjusted, including：It is right according to the target drives voltage
Standoff voltage the Vgl current TFT is adjusted.
3. according to the method described in claim 2, it is characterized in that, described judge whether the continuously display time is more than arbitrarily
One preset time；If so, determine corresponding target drives voltage of the continuously display time, including：
Judge whether the continuously display time is more than the first preset time, if so, determining that the target drives voltage is
First object driving voltage；Otherwise, then judge whether the continuously display time is more than the second preset time.
4. according to the method described in claim 3, it is characterized in that, described judge whether the continuously display time is more than arbitrarily
One preset time；If so, determining corresponding target drives voltage of the continuously display time, further include：
If judging, the continuously display time is more than the second preset time, it is determined that it is the second mesh to go out the target drives voltage
Mark driving voltage；Otherwise, then judge whether the continuously display time is more than third preset time.
5. according to the method described in claim 4, it is characterized in that, described judge whether the continuously display time is more than arbitrarily
One preset time；If so, determining corresponding target drives voltage of the continuously display time, further include：
If judging, the continuously display time is more than third preset time, it is determined that it is third mesh to go out the target drives voltage
Mark driving voltage.
6. according to the method described in claim 3, it is characterized in that, the method further includes：
When judging that the continuously display time is less than or equal to first preset time, and detects and switch to next frame figure
As when being shown, determining the image difference value between the next frame image and the current frame image；
Judge whether described image difference value is more than preset image difference threshold, if so, by the current driving electricity of the TFT
Pressure is adjusted to the initial boost voltage, from the beginning determines the continuously display time of the next frame image.
7. according to the method described in claim 6, it is characterized in that, the method further includes：
If described image difference value be less than or equal to described image discrepancy threshold, by the next frame image it is continuously display when
Between be accumulated in the continuously display time of the current frame image.
8. a kind of display device, which is characterized in that including be sequentially connected electrically voltage setting module, time detection module, voltage
Determining module and VRM Voltage Regulator Module；
The voltage setting module, for setting the present drive voltage of thin film transistor (TFT) TFT to initial boost voltage；It is described
Time detection module, the continuously display time for detecting current frame image；The voltage determination module, for being held described in determination
It is continuous to show time corresponding target drives voltage；The VRM Voltage Regulator Module is used for according to the target drives voltage, to current
Driving voltage is adjusted.
9. device according to claim 8, which is characterized in that the VRM Voltage Regulator Module includes：Signal input part, feedback
Voltage regulation unit, driving voltage adjust unit, first resistor and signal output end；
The first end that the feedback voltage adjusts unit is electrically connected with the signal input part, second end and the driving voltage tune
Save the first end electrical connection of unit, third end ground connection；The driving voltage adjusts the second end of unit and the signal output end
Electrical connection；The first resistor is in parallel with driving voltage adjusting unit；
The feedback voltage adjusts unit and is used to receive control corresponding with the target drives voltage by the signal input part
Signal processed generates corresponding feedback voltage signal according to the control signal, and the feedback voltage signal is transmitted to described
Driving voltage adjusts unit；The driving voltage adjusts unit, for generating corresponding adjust according to the feedback voltage signal
Drive voltage signal afterwards, and exported by the signal output end.
10. device according to claim 9, which is characterized in that it includes at least one set of adjust that the feedback voltage, which adjusts unit,
Economize on electricity road, every group of adjusting circuit include：Amplifier, switching device and second resistance；
The anode of the amplifier is electrically connected with the signal input part, and cathode is electrically connected with the first end of the switching device；
First pole of the switching device is electrically connected with the first end of the second resistance, the second pole ground connection of the switching device；Institute
It states the second end of second resistance and the driving voltage adjusts unit and the first resistor is both electrically connected with；
The amplifier, for being amplified processing to the control signal inputted by the signal input part；The switching device,
For opening or closing under the control of said control signal, to organize the break-make for adjusting circuit belonging to realization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810146037.3A CN108305591B (en) | 2018-02-12 | 2018-02-12 | Display control method and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810146037.3A CN108305591B (en) | 2018-02-12 | 2018-02-12 | Display control method and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108305591A true CN108305591A (en) | 2018-07-20 |
| CN108305591B CN108305591B (en) | 2020-06-26 |
Family
ID=62865456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810146037.3A Expired - Fee Related CN108305591B (en) | 2018-02-12 | 2018-02-12 | Display control method and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108305591B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112927647A (en) * | 2021-02-02 | 2021-06-08 | 深圳市华星光电半导体显示技术有限公司 | Display device and driving method thereof |
| WO2023231675A1 (en) * | 2022-05-30 | 2023-12-07 | 京东方科技集团股份有限公司 | Afterimage compensation method and apparatus, display device and computer-readable storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102968971A (en) * | 2012-11-08 | 2013-03-13 | 京东方科技集团股份有限公司 | Liquid crystal display driving method, time sequence control device and liquid crystal display device |
| CN103778897A (en) * | 2014-01-28 | 2014-05-07 | 北京京东方显示技术有限公司 | Image display control method and device |
| CN106157919A (en) * | 2016-09-09 | 2016-11-23 | 京东方科技集团股份有限公司 | The display packing of a kind of display panels and device |
| KR20170123400A (en) * | 2016-04-28 | 2017-11-08 | 엘지디스플레이 주식회사 | Organic light emitting display panel, organic light emitting display device, and the method for driving the organic light emitting display device |
| CN107452334A (en) * | 2017-08-30 | 2017-12-08 | 京东方科技集团股份有限公司 | Image element circuit and its driving method, display base plate and its driving method, display device |
-
2018
- 2018-02-12 CN CN201810146037.3A patent/CN108305591B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102968971A (en) * | 2012-11-08 | 2013-03-13 | 京东方科技集团股份有限公司 | Liquid crystal display driving method, time sequence control device and liquid crystal display device |
| CN103778897A (en) * | 2014-01-28 | 2014-05-07 | 北京京东方显示技术有限公司 | Image display control method and device |
| KR20170123400A (en) * | 2016-04-28 | 2017-11-08 | 엘지디스플레이 주식회사 | Organic light emitting display panel, organic light emitting display device, and the method for driving the organic light emitting display device |
| CN106157919A (en) * | 2016-09-09 | 2016-11-23 | 京东方科技集团股份有限公司 | The display packing of a kind of display panels and device |
| CN107452334A (en) * | 2017-08-30 | 2017-12-08 | 京东方科技集团股份有限公司 | Image element circuit and its driving method, display base plate and its driving method, display device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112927647A (en) * | 2021-02-02 | 2021-06-08 | 深圳市华星光电半导体显示技术有限公司 | Display device and driving method thereof |
| WO2023231675A1 (en) * | 2022-05-30 | 2023-12-07 | 京东方科技集团股份有限公司 | Afterimage compensation method and apparatus, display device and computer-readable storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108305591B (en) | 2020-06-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10008159B2 (en) | Organic electroluminescent display panel, display apparatus and luminance compensation method | |
| US11114027B2 (en) | OLED pixel circuit, and driving method thereof, and a display apparatus | |
| US10453398B2 (en) | Display apparatus and driving method thereof | |
| CN100583212C (en) | Image display device | |
| KR101670402B1 (en) | Display and touch panels with drive and sense techniques | |
| CN102654973B (en) | Pixel circuit and drive method thereof as well as display panel | |
| KR100959085B1 (en) | Active drive type light emitting display device and drive control method thereof | |
| CN105144273A (en) | Video image signal processing circuit, method for processing video image signal, and display device | |
| CN104091562B (en) | Image element circuit, display panel and display device | |
| US20150062192A1 (en) | Organic light emitting display device | |
| CN104700761A (en) | Detecting circuit and detecting method and driving system thereof | |
| CN108154834B (en) | Electroluminescent display panel and cross-voltage detection method of light emitting device | |
| CN104078006A (en) | Pixel circuit, display panel and display device | |
| EP2531994B1 (en) | Display device | |
| US20190164474A1 (en) | Driving method and driving chip for organic light-emitting display panel, and display device | |
| US11238801B2 (en) | Method and device for obtaining compensation parameter for pixel data and AMOLED display panel | |
| CN105225627A (en) | A kind of display device and driving method thereof | |
| US10650743B2 (en) | Method for driving pixel circuit | |
| CN108305591A (en) | Display control method and display device | |
| US7486100B2 (en) | Active matrix panel inspection device and inspection method | |
| CN104517572A (en) | Amoled pixel circuit | |
| CN203941676U (en) | Image element circuit, display panel and display device | |
| CN113971926A (en) | LED driving device and LED driving method | |
| CN203134328U (en) | Pixel circuit and display device thereof | |
| CN101231189B (en) | Ambient light sensing circuit and flat panel display including ambient light sensing circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200626 Termination date: 20220212 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |