CN104656291B - A kind of system and method for differentiating direct current image retention - Google Patents
A kind of system and method for differentiating direct current image retention Download PDFInfo
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- CN104656291B CN104656291B CN201510100135.XA CN201510100135A CN104656291B CN 104656291 B CN104656291 B CN 104656291B CN 201510100135 A CN201510100135 A CN 201510100135A CN 104656291 B CN104656291 B CN 104656291B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
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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
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Abstract
The present invention provides a kind of systems and method for differentiating direct current image retention, are related to display technology field, and LCD can be identified with the presence or absence of direct current image retention by the system.A kind of system for differentiating direct current image retention, including：LCD after showing the first picture in lasting preset time, shows the second picture；The grayscale value of all pixels of second picture is identical, and the second picture shows picture by region division for the multiple second sons；Filming apparatus for since being shown the second picture LCD, being shot to LCD in the second picture that n-th frame is shown, obtains the picture of the second picture, and n is the natural number no more than the first preset value；The picture of second picture includes the picture that at least two second sons show picture, if at least two second sons show that the brightness of the picture of picture is identical, direct current image retention is not present in LCD, and otherwise there are direct current image retentions by LCD；The time for exposure of filming apparatus shows the time of a frame picture no more than LCD.
Description
Technical field
The present invention relates to display technology field more particularly to a kind of systems and method for differentiating direct current image retention.
Background technology
The display screen of LCD (Liquid Crystal Display, liquid crystal display) keeps a static picture for a long time
Face, liquid crystal cause liquid crystal molecule that cannot normally be deflected under signal voltage control since driving for a long time being subject to be polarized.
After LCD shows a period of time, even if changing the content for showing picture, that static figure before still can see on a display screen
The trace of picture.This phenomenon is known as image retention (Image Sticking, abbreviation IS), and image retention seriously affects the display quality of LCD.
The mechanism generated according to image retention is different, can be divided into direct current (Direct Current, DC) image retention and exchange
(Alternating Current, AC) image retention.Since the compensation method of different type image retention is different, so for image retention
LCD, it is to first have to solve the problems, such as to identify image retention type, but how to differentiate the image retention class occurred in LCD products at present
Type, there are no the test methods of system.
The content of the invention
The embodiment of the present invention provides a kind of system and method for differentiating direct current image retention, can be identified by the system
LCD whether there is direct current image retention.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that：
On the one hand, a kind of system for differentiating direct current image retention is provided, which includes：LCD, in lasting preset time
After showing the first picture, the second picture is shown；The grayscale value of all pixels of second picture is identical, and described second draws
Face shows picture by region division for the multiple second sons；Filming apparatus, during for showing second picture since the LCD
It rises, the LCD in the second picture that n-th frame is shown is shot, obtains the picture of second picture, wherein, n is little
In the natural number of preset value；The picture of second picture includes the picture that at least two second sons show picture, if institute
It states at least two second sons and shows that the brightness of the picture of picture is identical, then direct current image retention is not present in the LCD, otherwise described
There are direct current image retentions by LCD；Wherein, the time for exposure of the filming apparatus shows the time of a frame picture no more than the LCD.
On the other hand, a kind of method for differentiating direct current image retention is provided, this method includes：LCD is shown in lasting preset time
After showing the first picture, the second picture is shown；The grayscale value of all pixels of second picture is identical, and second picture
By region division picture is shown for the multiple second sons；Filming apparatus is since being shown second picture the LCD, to institute
It states LCD to be shot in the second picture that n-th frame is shown, obtains the picture of second picture, wherein, n is no more than default
The natural number of value；The picture of second picture include at least two it is described second son show pictures pictures, if it is described at least
Two second sons show that the brightness of the picture of picture is identical, then direct current image retention is not present in the LCD, and otherwise the LCD is deposited
In direct current image retention；Wherein, the time for exposure of the filming apparatus shows the time of a frame picture no more than the LCD.
The embodiment provides a kind of system and method for differentiating direct current image retention, which includes LCD and bat
Device is taken the photograph, LCD is after lasting preset time shows the first picture, then the region there are direct current image retention is present with bias voltage, when
When LCD switches to the second picture, since the grayscale value of all pixels of the second picture is identical, then driving voltage is also identical, so
Voltage there are the region of direct current image retention includes bias voltage and driving voltage, and the voltage of other normal display areas only includes
Driving voltage, the i.e. region there are direct current image retention are different from the on-load voltage of other normal display areas, then show picture in a frame
In face, the picture brightness that the two corresponds to display is different；And then the second picture that n-th frame is shown is clapped by filming apparatus
It takes the photograph, wherein, the time for exposure of filming apparatus shows the time of a frame picture no more than LCD, and the picture of the second picture is included at least
Two second sons show the picture of picture, if at least two second sons show that the brightness of the picture of picture is identical, illustrate LCD not
There are direct current image retentions, and otherwise illustrating LCD, there are direct current image retentions.It can effectively differentiate that LCD is residual with the presence or absence of direct current by the system
Picture.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of schematic diagram of first picture provided in an embodiment of the present invention；
Fig. 2 is the schematic diagram that direct current image retention influences positive-negative polarity applied voltage；
Fig. 3 is a kind of flow diagram of method for differentiating direct current image retention provided in an embodiment of the present invention；
Fig. 4 is a kind of system structure diagram for differentiating direct current image retention provided in an embodiment of the present invention.
Reference numeral：
The first pictures of 1-；The first sons of 11- show picture.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment belongs to the scope of protection of the invention.
In order to be better understood from the embodiment of the present invention, illustrate that the embodiment of the present invention differentiates the original of direct current image retention first below
Reason.
It can there are some foreign ions, these foreign ions to power up outside due to the limitation of production technology, in the liquid crystal of LCD
Under the action of, it may occur that directed movement, and be gathered near the alignment films of liquid crystal both sides, and then form bias voltage.Work as LCD
When showing picture, under the action of outer making alive, orientation changes liquid crystal, and then realizes display；But it is biased due to existing
Voltage, then actually liquid crystal is subject to the collective effect of applied voltage and bias voltage, and liquid crystal aligning is affected, so as to display
Picture grayscale is different from theoretical value.The image retention as caused by the bias voltage that foreign ion is formed is direct current image retention.
And it is the anchoring energy deficiency due to liquid crystal orientation film for liquid crystal to exchange image retention, and liquid crystal is caused to disappear in applied voltage
After cannot recover image retention caused by ortho states.
Inventor has found after direct current image retention is carefully analyzed research with the mechanism of production for exchanging image retention：Direct current image retention with exchange
The principle that image retention influences liquid crystal aligning is different, and direct current image retention is taken by the voltage influence liquid crystal for influencing to be applied on liquid crystal molecule
To, and it is because liquid crystal orientation film influences liquid crystal aligning for the anchoring energy deficiency of liquid crystal to exchange image retention.
If LCD, there are direct current image retention, liquid crystal aligning is subject to the collective effect of applied voltage and bias voltage.People from this field
Member is it should be understood that LCD shows that picture is made of multiple pixels, then when the applied voltage of all pixels in LCD is identical,
Then the corresponding liquid crystal molecular orientation of all pixels is identical, and LCD should show the picture of the i.e. same brightness of the picture of same grayscale；But
If being there are direct current image retention, bias voltage can influence the orientation of the liquid crystal molecule of corresponding region, and so there are direct current image retentions
The grayscale of the grayscale display picture corresponding from other normal regions of the corresponding display picture in region is different, then in a frame picture
It is present with luminance difference.
And it is caused by liquid crystal orientation film is for the anchoring energy deficiency of liquid crystal to exchange image retention, does not have an impact and is applied to
Voltage on liquid crystal molecule, when the applied voltage of all pixels in LCD is identical, LCD can show the picture of same grayscale, will not
There is luminance difference.
Inventor is based on above-mentioned principle, it is proposed that the system provided in an embodiment of the present invention for differentiating direct current image retention and side
Method.
An embodiment of the present invention provides it is a kind of differentiate direct current image retention system, including：
LCD after showing the first picture in lasting preset time, shows the second picture；All pictures of second picture
The grayscale value of element is identical, and the second picture shows picture by region division for the multiple second sons.
Filming apparatus, for since being shown the second picture LCD, being carried out to LCD in the second picture that n-th frame is shown
Shooting, obtains the picture of the second picture, wherein, n is the natural number no more than the first preset value；The picture of second picture is included extremely
Few two second sons show the picture of picture, if at least two second sons show that the brightness of the picture of picture is identical, LCD is not deposited
In direct current image retention, otherwise there are direct current image retentions by LCD.Wherein, the time for exposure of filming apparatus shows a frame picture no more than LCD
Time.
In above system, LCD shows the first picture in lasting preset time, and the embodiment of the present invention is not made for preset time
It limits, as long as meeting LCD after lasting preset time shows the first picture, the region there are direct current image retention can generate biased electrical
Pressure.Exemplary, which can be 10h or 15h etc., specifically can be depending on actual conditions.
In above system, the embodiment of the present invention for the second picture by region division second son show picture number with
And size is not construed as limiting.
In above system, the second picture for show of n-th frame of filming apparatus shooting, wherein, n is no more than the first preset value
Natural number, the embodiment of the present invention is not especially limited for first preset value.If LCD is there are direct current image retention, LCD is aobvious
Show the bias voltage that is generated during the first picture can persistently there are a period of time T1, if what the n-th frame of filming apparatus shooting was shown
Second picture is in the T1.Specifically, if LCD shows the time of a frame picture as T, in T1, LCD shows T1/T
Frame picture, then, the first preset value can be expressed as T1/T, as long as n is not more than T1/T.It is exemplary, if LCD shows a frame
The frequency f of picture is 60Hz, and T1 is 30 minutes, then T1/T=T1 × f=30 × 60 × 60=108000, then n is not more than
108000；Alternatively, if LCD shows the frequency f of a frame picture as 120Hz, T1 is 30 minutes, then T1/T=T1 × f=30
× 60 × 120=216000, then n is not more than 216000；Alternatively, if LCD shows the frequency f of a frame picture as 60Hz,
T1 is 10 minutes, then T1/T=T1 × f=10 × 60 × 60=36000, then n is not more than 36000.
The embodiment provides a kind of system for differentiating direct current image retention, which includes LCD and filming apparatus,
LCD is after lasting preset time shows the first picture, then the region there are direct current image retention is present with bias voltage, when LCD switches
During to the second picture, since the grayscale value of all pixels of the second picture is identical, then driving voltage is also identical, and so there are direct currents
The voltage in the region of image retention includes bias voltage and driving voltage, and the voltage of other normal display areas only includes driving electricity
Pressure, i.e., the region there are direct current image retention is different from the on-load voltage of other normal display areas, then in a frame shows picture, two
The picture brightness that person corresponds to display is different；And then the second picture that n-th frame is shown is shot by filming apparatus, wherein,
The time for exposure of filming apparatus shows the time of a frame picture no more than LCD, and the picture of the second picture includes at least two second
Son shows the picture of picture, if at least two second sons show that the brightness of the picture of picture is identical, illustrates that direct current is not present in LCD
Image retention, otherwise illustrating LCD, there are direct current image retentions.It can effectively differentiate that LCD whether there is direct current image retention by the system.
Further, which further includes：The signal controller to communicate respectively with LCD and filming apparatus；Signal controller,
For sending the first signal to LCD, the first signal is used to indicate LCD by showing that the first picture switches to the second picture of display；Letter
Number controller while being additionally operable to send the first signal or afterwards, sends secondary signal, secondary signal is used for filming apparatus
Instruction filming apparatus is shot.
In above system, signal controller be additionally operable to send the first signal while or afterwards, to filming apparatus send
Secondary signal, the second picture shown so as to filming apparatus shooting n-th frame.Signal controller send the first signal while to
In the case that filming apparatus sends secondary signal, what filming apparatus was shot is the second picture that the 1st frame is shown；In signal controller
Send the first signal it is rear send secondary signal to filming apparatus in the case of, filming apparatus shooting be after the 1st frame the
Two pictures.Need exist for explanation, the embodiment of the present invention for signal controller send the first signal after by how long when
Between again to filming apparatus send secondary signal be not especially limited, as long as meet send secondary signal after, filming apparatus can be clapped
Take the photograph the second picture that n-th frame is shown.
Exemplary, signal controller can send second at m × T moment after sending the first signal to filming apparatus
Signal, wherein, m=n+1, T are the time that LCD shows a frame picture；Explanation is needed exist for, m and n meets the pass of n+1=m
System, i.e. m × T moment of the signal controller after the first signal is sent send secondary signal to filming apparatus, then shoot dress
Put shooting is the second picture that the (n+1)th frame is shown.Exemplary, as m=1, LCD started to show the 2nd frame at 1 × T moment
Picture, 1 × T moment of the signal controller after the first signal is sent send secondary signal to filming apparatus, due to shooting
The time for exposure of device shows the time of a frame picture no more than LCD, then can ensure filming apparatus shooting is that the (n+1)th frame is shown
The second picture shown.
In addition, the connection mode that the embodiment of the present invention communicates for signal controller with LCD and filming apparatus respectively is not made
It limits, specifically can be exemplary depending on actual conditions, signal controller can pass through wired connection mode and filming apparatus
Communication or signal controller can also be communicated by radio connection with filming apparatus, such as signal controller can lead to
The radio connections such as bluetooth, infrared are crossed to communicate with filming apparatus.
On the one hand above system sends the first signal so as to which LCD be controlled to switch to the from the first picture by signal controller
On the other hand two pictures send secondary signal and then control by signal controller while the first signal is sent or afterwards
The second picture that filming apparatus shooting LCD is shown in n-th frame.
Since the LCD regions for direct current image retention occur are uncertain, in order to more accurately judge that the LCD whether there is direct current
Image retention and the region there are direct current image retention, refering to what is shown in Fig. 1, the first picture 1 shows picture by region division for the multiple first sons
Face 11, each first son show that the grayscale value of each pixel in picture is identical, and two neighboring first son shows the pixel of picture
Grayscale value is different.Explanation is needed exist for, the embodiment of the present invention shows the grayscale value of each pixel in picture not for the first son
Be construed as limiting, for example, the first son show picture can be white that grayscale value as shown in Figure 1 is 255 or grayscale value be 0 it is black
Color can also be the color of other grayscale values certainly, and which is not described herein again.In addition, the embodiment of the present invention is shown for the first son
The number of picture does not also limit, depending on actual conditions.
Preferably, since the grayscale value difference of black and white is maximum, refering to what is shown in Fig. 1, the first son is shown in picture 11
The grayscale value of each pixel is 255 or 0, in this way, the first son that grayscale value is 255 shows that picture and adjacent grayscale value are 0
First son shows that the applied voltage of picture differs greatly, if there are direct current image retention, both the bias voltage difference that generates also compared with
Greatly, be conducive to subsequently identify the presence or absence of luminance difference.
Optionally, for the ease of observing luminance difference, multiple first sons of the first picture show pictures and the second picture
Multiple second sons show that picture corresponds.
Further, for the ease of the picture of the second relatively taken picture, second in the picture of the second picture
It is multigroup that son shows that the picture of picture includes, and every group includes the picture that 2 second sons show picture, and every group of 2 second sons are aobvious
Show picture picture difference respective pixel grayscale value it is different first son show picture, so can more multigroup picture, as long as
As soon as there is luminance difference in group picture piece, illustrate the LCD there are direct current image retention, while LCD can be found according to picture and existed directly
The specific region of image retention is flowed, subsequently to improve.
It is further preferred that every group of 2 second sons show that the second son corresponding to the picture of picture shows picture difference
It is driven by the voltage of opposed polarity, so fainter direct current image retention can also be identified.
Concrete principle is as follows：If the second son shows picture corresponding region there is no direct current image retention, the second son shows picture
When being driven respectively by positive-negative polarity voltage, positive polarity voltage is symmetrical with reverse voltage, i.e. the absolute value of the two is identical
's；If the second son shows picture corresponding region there are direct current image retention, due to the influence of bias voltage, theoretical voltage line of symmetry will
Offset, refering to what is shown in Fig. 2, positive polarity voltage is no longer symmetrical with reverse voltage, the absolute value of positive polarity voltage, which is less than, to be born
Polar voltages, the absolute value of certain positive polarity voltage can also be more than reverse voltage, here only with the absolute of positive polarity voltage
Value illustrates exemplified by being less than reverse voltage.
According to above-mentioned principle, two second sons in a group show that all there are direct current image retentions for picture corresponding region
In the case of, if 2 second sons in one group show that the second son corresponding to the picture of picture shows electricity of the picture by identical polar
Pressure drives, if two second sons show that the bias voltage difference that picture corresponding regions generate is smaller, the difference of the two voltage
It is smaller, then the luminance difference of two pictures is fainter, it is difficult to differentiate；If 2 second sons in one group show the figure of picture
The second son corresponding to piece shows that picture is driven by the voltage of opposed polarity, then understands with reference to figure 2, is driven by positive polarity voltage
Second son show picture voltage be lowered, by reverse voltage driving second son show picture voltage be enhanced, this
Sample, the absolute value differences of the two voltage become larger, then the luminance difference increase of corresponding two pictures, is easy to differentiate.
It should be noted that the embodiment of the present invention is not construed as limiting for specific type of drive, such as may be employed a little anti-
Turn the either type of drive such as row reversion or column inversion, there are at least two the second son displays as long as meeting in a frame picture
Picture is driven by the voltage of opposed polarity.
Optionally, if the brightness of the second picture is too high or too dark, then subtle luminance difference is difficult to differentiate, then excellent
The grayscale value scope of all pixels in the second picture is selected as 64-127, such as grayscale value can be 75,90,100,110 etc., one
As the grayscale value that uses for 64.
An embodiment of the present invention provides a kind of method for differentiating direct current image retention, method includes：
LCD shows the second picture after lasting preset time shows the first picture；The ash of all pixels of second picture
Rank value is identical, and the second picture shows picture by region division for the multiple second sons.
Filming apparatus shoots LCD in the second picture that n-th frame is shown since being shown the second picture LCD,
The picture of the second picture is obtained, wherein, n is the natural number no more than preset value；The picture of second picture includes at least two the
Two sons show the picture of picture, if at least two second sons show that the brightness of the picture of picture is identical, there is no direct current is residual by LCD
Picture, otherwise there are direct current image retentions by LCD；Wherein, the time for exposure of filming apparatus shows the time of a frame picture no more than LCD.
In the above method, LCD shows the first picture in lasting preset time, and the embodiment of the present invention is not made for preset time
It limits, as long as meeting LCD after lasting preset time shows the first picture, the region there are direct current image retention can generate biased electrical
Pressure.Exemplary, which can be 10h or 15h etc., specifically can be depending on actual conditions.
In the above method, the embodiment of the present invention for the second picture by region division second son show picture number with
And size is not construed as limiting.
In above system, the second picture for show of n-th frame of filming apparatus shooting, wherein, n is no more than the first preset value
Natural number, the embodiment of the present invention is not especially limited for first preset value.If LCD is there are direct current image retention, LCD is aobvious
Show the bias voltage that is generated during the first picture can persistently there are a period of time T1, if what the n-th frame of filming apparatus shooting was shown
Second picture is in the T1.Specifically, if LCD shows the time of a frame picture as T, in T1, LCD shows T1/T
Frame picture, then, the first preset value can be expressed as T1/T, as long as n is not more than T1/T.It is exemplary, if LCD shows a frame
The frequency f of picture is 60Hz, and T1 is 30 minutes, then T1/T=T1 × f=30 × 60 × 60=108000, then n is not more than
108000；Alternatively, if LCD shows the frequency f of a frame picture as 120Hz, T1 is 30 minutes, then T1/T=T1 × f=30
× 60 × 120=216000, then n is not more than 216000；Alternatively, if LCD shows the frequency f of a frame picture as 60Hz,
T1 is 10 minutes, T1/T=T1 × f=10 × 60 × 60=36000, then n is not more than 36000.
The embodiment provides a kind of method for differentiating direct current image retention, refering to what is shown in Fig. 3, this method includes：
Step S01, LCD shows the second picture after lasting preset time shows the first picture；Second picture owns
The grayscale value of pixel is identical, and the second picture shows picture by region division for the multiple second sons.
Step S02, filming apparatus shows the second picture since the LCD, the second picture for being shown to LCD in n-th frame
It is shot, obtains the picture of the second picture, wherein, n is the natural number no more than preset value；The picture of second picture is included extremely
Few two second sons show the picture of picture.
LCD is after lasting preset time shows the first picture, then the region there are direct current image retention is present with bias voltage, when
When LCD switches to the second picture, since the grayscale value of all pixels of the second picture is identical, then driving voltage is also identical, so
Voltage there are the region of direct current image retention includes bias voltage and driving voltage, and the voltage of other normal display areas only includes
Driving voltage, the i.e. region there are direct current image retention are different from the on-load voltage of other normal display areas, then show picture in a frame
In face, the picture brightness that the two corresponds to display is different；And then the second picture that n-th frame is shown is clapped by filming apparatus
It takes the photograph, wherein, the time for exposure of filming apparatus shows the time of a frame picture no more than LCD, and the picture of the second picture is included at least
Two second sons show the picture of picture, if at least two second sons show that the brightness of the picture of picture is identical, illustrate LCD not
There are direct current image retentions, and otherwise illustrating LCD, there are direct current image retentions.It can effectively differentiate that LCD is residual with the presence or absence of direct current by this method
Picture.
Further, before LCD shows the second picture, refering to what is shown in Fig. 4, this method further includes：
Step S03, signal controller sends the first signal to LCD, and the first signal is used to indicate LCD by showing the first picture
Switch to the second picture of display.
Step S04, signal controller while the first signal, that is, step S03 is sent or it is rear to filming apparatus send
Secondary signal, secondary signal are used to indicate filming apparatus and are shot.
In the above method, signal controller sends second while the first signal is sent or afterwards, to filming apparatus
Signal, the second picture shown so as to filming apparatus shooting n-th frame.To shooting while signal controller sends the first signal
In the case that device sends secondary signal, what filming apparatus was shot is the second picture that the 1st frame is shown；It is sent in signal controller
In the case of the rear transmission secondary signal to filming apparatus of first signal, what filming apparatus was shot is the second picture after the 1st frame
Face.Need exist for explanation, the embodiment of the present invention for signal controller send the first signal after by how long again
Secondary signal is sent to filming apparatus to be not especially limited, as long as after meeting transmission secondary signal, filming apparatus can shoot n-th
The second picture that frame is shown.
Exemplary, signal controller can send second at m × T moment after sending the first signal to filming apparatus
Signal, wherein, m=n+1, T are the time that LCD shows a frame picture；Explanation is needed exist for, m and n meets the pass of n+1=m
System, i.e. m × T moment of the signal controller after the first signal is sent send secondary signal to filming apparatus, then shoot dress
Put shooting is the second picture that the (n+1)th frame is shown.Exemplary, as m=1, LCD started to show the 2nd frame at 1 × T moment
Picture, 1 × T moment of the signal controller after the first signal is sent send secondary signal to filming apparatus, due to shooting
The time for exposure of device shows the time of a frame picture no more than LCD, then can ensure filming apparatus shooting is that the (n+1)th frame is shown
The second picture shown.
In addition, the connection mode that the embodiment of the present invention communicates for signal controller with LCD and filming apparatus respectively is not made
It limits, specifically can be exemplary depending on actual conditions, signal controller can pass through wired connection mode and filming apparatus
Communication or signal controller can also be communicated by radio connection with filming apparatus, such as signal controller can lead to
Cross the radio connections such as bluetooth, infrared and filming apparatus such as CCD (Charge-coupled Device, Charged Couple member
Part) camera communication.
On the one hand the above method sends the first signal so as to which LCD be controlled to switch to the from the first picture by signal controller
On the other hand two pictures send secondary signal and then control by signal controller while the first signal is sent or afterwards
The second picture that filming apparatus shooting LCD is shown in n-th frame.
Since the LCD regions for direct current image retention occur are uncertain, in order to more accurately judge that the LCD whether there is direct current
Image retention and the region there are direct current image retention, refering to what is shown in Fig. 1, the first picture 1 shows picture by region division for the multiple first sons
Face 11, each first son show that the grayscale value of each pixel in picture is identical, and two neighboring first son shows the pixel of picture
Grayscale value is different.Explanation is needed exist for, the embodiment of the present invention shows the grayscale value of each pixel in picture not for the first son
Be construed as limiting, for example, the first son show picture can be white that grayscale value as shown in Figure 1 is 255 or grayscale value be 0 it is black
Color can also be the color of other grayscale values certainly, and which is not described herein again.In addition, the embodiment of the present invention is shown for the first son
The number of picture does not also limit, depending on actual conditions.
Preferably, since the grayscale value difference of black and white is maximum, refering to what is shown in Fig. 1, the first son is shown in picture 11
The grayscale value of each pixel is 255 or 0, in this way, the first son that grayscale value is 255 shows that picture and adjacent grayscale value are 0
First son shows that the applied voltage of picture differs greatly, if there are direct current image retention, both the bias voltage difference that generates also compared with
Greatly, be conducive to subsequently identify the presence or absence of luminance difference.
Optionally, for the ease of observing luminance difference, multiple first sons of the first picture show pictures and the second picture
Multiple second sons show that picture corresponds.
Further, for the ease of the picture of the second relatively taken picture, second in the picture of the second picture
It is multigroup that son shows that the picture of picture includes, and every group includes the picture that 2 second sons show picture, and every group of 2 second sons are aobvious
Show picture picture difference respective pixel grayscale value it is different first son show picture, so can more multigroup picture, as long as
As soon as there is luminance difference in group picture piece, illustrate the LCD there are direct current image retention, while LCD can be found according to picture and existed directly
The specific region of image retention is flowed, subsequently to improve.
It is further preferred that every group of 2 second sons show that the second son corresponding to the picture of picture shows picture difference
It is driven by the voltage of opposed polarity, so fainter direct current image retention can also be identified.
Concrete principle is as follows：If the second son shows picture corresponding region there is no direct current image retention, the second son shows picture
When being driven respectively by positive-negative polarity voltage, positive polarity voltage is symmetrical with reverse voltage, i.e. the absolute value of the two is identical
's；If the second son shows picture corresponding region there are direct current image retention, due to the influence of bias voltage, theoretical voltage line of symmetry will
Offset, refering to what is shown in Fig. 2, positive polarity voltage is no longer symmetrical with reverse voltage, the absolute value of positive polarity voltage, which is less than, to be born
Polar voltages, the absolute value of certain positive polarity voltage can also be more than reverse voltage, here only with the absolute of positive polarity voltage
Value illustrates exemplified by being less than reverse voltage.
According to above-mentioned principle, two second sons in a group show that all there are direct current image retentions for picture corresponding region
In the case of, if 2 second sons in one group show that the second son corresponding to the picture of picture shows electricity of the picture by identical polar
Pressure drives, if two second sons show that the bias voltage difference that picture corresponding regions generate is smaller, the difference of the two voltage
It is smaller, then the luminance difference of two pictures is fainter, it is difficult to differentiate；If 2 second sons in one group show the figure of picture
The second son corresponding to piece shows that picture is driven by the voltage of opposed polarity, then understands with reference to figure 2, is driven by positive polarity voltage
Second son show picture voltage be lowered, by reverse voltage driving second son show picture voltage be enhanced, this
Sample, the absolute value differences of the two voltage become larger, then the luminance difference increase of corresponding two pictures, is easy to differentiate.
It should be noted that the embodiment of the present invention is not construed as limiting for specific type of drive, such as may be employed a little anti-
Turn the either type of drive such as row reversion or column inversion, there are at least two the second son displays as long as meeting in a frame picture
Picture is driven by the voltage of opposed polarity.
Optionally, if the brightness of the second picture is too high or too dark, then subtle luminance difference is difficult to differentiate, then excellent
The grayscale value scope of all pixels in the second picture is selected as 64-127, such as grayscale value can be 75,90,100,110 etc., one
As the grayscale value that uses for 64.
More than, it is only specific embodiment of the invention, but protection scope of the present invention is not limited thereto, and it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in change or replacement, should all cover
Within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. a kind of system for differentiating direct current image retention, which is characterized in that including：
LCD after showing the first picture in lasting preset time, shows the second picture；All pictures of second picture
The grayscale value of element is identical, and second picture shows picture by region division for the multiple second sons；
Filming apparatus, for since second picture is shown the LCD, the LCD is shown in n-th frame second
Picture is shot, and obtains the picture of second picture, wherein, n is the natural number no more than the first preset value；Described second
The picture of picture includes the picture that at least two second sons show picture, if at least two second son shows picture
The brightness of the picture in face is identical, then direct current image retention is not present in the LCD, and otherwise there are direct current image retentions by the LCD；
Wherein, the time for exposure of the filming apparatus shows the time of a frame picture no more than the LCD；
The grayscale value scope of all pixels is 64-127 in second picture；
First picture shows picture by region division for the multiple first sons, and each first son shows each pixel in picture
Grayscale value it is identical, and two neighboring first son shows that the grayscale value of the pixel of picture is different；
Multiple first sons of first picture show that multiple second sons of picture and second picture show picture
Face corresponds.
2. system according to claim 1, which is characterized in that further include：Lead to respectively with the LCD and the filming apparatus
The signal controller of letter；
The signal controller, for sending the first signal to the LCD, first signal is used to indicate the LCD by showing
Show that the first picture switches to the second picture of display；
While being additionally operable to send first signal or afterwards, the is sent to the filming apparatus for the signal controller
Binary signal, the secondary signal are used to indicate the filming apparatus and are shot.
3. system according to claim 1, which is characterized in that first son shows that the grayscale value of each pixel in picture is
255 or 0.
4. system according to claim 1, which is characterized in that
It is multigroup that second son in the picture of second picture shows that the picture of picture includes, and every group includes 2 described the
Two sons show the picture of picture, and every group of 2 second sons show that the picture difference respective pixel grayscale value of picture is different
It is described first son show picture.
5. system according to claim 4, which is characterized in that every group of 2 second sons show the picture institute of picture
Corresponding second son shows that picture is driven respectively by the voltage of opposed polarity.
A kind of 6. method for differentiating direct current image retention, which is characterized in that the described method includes：
LCD shows the second picture after lasting preset time shows the first picture；The ash of all pixels of second picture
Rank value is identical, and second picture shows picture by region division for the multiple second sons；
Filming apparatus is since being shown second picture the LCD, the second picture for being shown to the LCD in n-th frame
It is shot, obtains the picture of second picture, wherein, n is the natural number no more than preset value；The figure of second picture
Piece includes the picture that at least two second sons show picture, if at least two second son shows the picture of picture
Brightness it is identical, then the LCD be not present direct current image retention, otherwise there are direct current image retentions by the LCD；
Wherein, the time for exposure of the filming apparatus shows the time of a frame picture no more than the LCD；
The grayscale value scope of all pixels is 64-127 in second picture；
First picture shows picture by region division for the multiple first sons, and each first son shows each pixel in picture
Grayscale value it is identical, and two neighboring first son shows that the grayscale value of the pixel of picture is different；
Multiple first sons of first picture show that multiple second sons of picture and second picture show picture
Face corresponds.
7. according to the method described in claim 6, it is characterized in that,
Before LCD shows second picture, the method further includes：
Signal controller to the LCD send the first signal, and while first signal is sent or it is rear to described
Filming apparatus sends secondary signal；First signal is used to indicate the LCD by showing that the first picture switches to display second
Picture, the secondary signal are used to indicate the filming apparatus and are shot.
8. according to the method described in claim 6, it is characterized in that, first son shows that the grayscale value of each pixel in picture is
255 or 0.
9. according to the method described in claim 6, it is characterized in that, second son in the picture of second picture is shown
The picture of picture includes multigroup, every group of picture for including 2 the second son display pictures, and every group of 2 second sons
Show that different first son of the picture difference respective pixel grayscale value of picture shows picture.
10. according to the method described in claim 9, it is characterized in that, every group of 2 second sons show the picture institute of picture
Corresponding second son shows that picture is driven respectively by the voltage of opposed polarity.
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| CN105869552B (en) * | 2016-03-31 | 2019-03-15 | Oppo广东移动通信有限公司 | A kind of detection method of display screen, detection device and terminal |
| CN107561743B (en) * | 2017-09-29 | 2020-03-31 | 深圳市华星光电半导体显示技术有限公司 | Residual image judgment method of liquid crystal display panel |
| CN110111713B (en) * | 2019-06-18 | 2022-09-09 | 京东方科技集团股份有限公司 | Residual image distinguishing method and device of display panel and display equipment |
| CN110376218B (en) * | 2019-07-29 | 2022-06-24 | 昆山国显光电有限公司 | Method and device for detecting residual image of display panel |
| CN111308749B (en) * | 2020-03-31 | 2023-05-12 | 京东方科技集团股份有限公司 | Lighting method, lighting machine, afterimage detection method and color analyzer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425246A (en) * | 2007-10-31 | 2009-05-06 | 台湾薄膜电晶体液晶显示器产业协会 | Method and device for detecting ghost phenomenon of display |
| CN101655409A (en) * | 2008-08-22 | 2010-02-24 | 北京京东方光电科技有限公司 | Method and device for rating afterimage |
| CN103376575A (en) * | 2012-04-19 | 2013-10-30 | 达兴材料股份有限公司 | Ghost testing method and system |
| CN104282251A (en) * | 2014-10-28 | 2015-01-14 | 合肥鑫晟光电科技有限公司 | Residual image grade judging method of display device and display device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201303820A (en) * | 2011-07-15 | 2013-01-16 | Chunghwa Picture Tubes Ltd | Method for examining liquid crystal driving voltages in liquid crystal display device |
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2015
- 2015-03-06 CN CN201510100135.XA patent/CN104656291B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425246A (en) * | 2007-10-31 | 2009-05-06 | 台湾薄膜电晶体液晶显示器产业协会 | Method and device for detecting ghost phenomenon of display |
| CN101655409A (en) * | 2008-08-22 | 2010-02-24 | 北京京东方光电科技有限公司 | Method and device for rating afterimage |
| CN103376575A (en) * | 2012-04-19 | 2013-10-30 | 达兴材料股份有限公司 | Ghost testing method and system |
| CN104282251A (en) * | 2014-10-28 | 2015-01-14 | 合肥鑫晟光电科技有限公司 | Residual image grade judging method of display device and display device |
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