CN107784991A - A kind of method of automated imaging amendment - Google Patents
A kind of method of automated imaging amendment Download PDFInfo
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- CN107784991A CN107784991A CN201711109135.1A CN201711109135A CN107784991A CN 107784991 A CN107784991 A CN 107784991A CN 201711109135 A CN201711109135 A CN 201711109135A CN 107784991 A CN107784991 A CN 107784991A
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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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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Abstract
The method that embodiment of the disclosure carries out automated imaging amendment on the sub-pixel in a kind of display for occurring deteriorating to performances such as brightness, contrast, saturation degrees by being imaged correction factor, this method compares the difference of sub-pixel performance and global assessment performance within multiple automatic cycles correction time by reference to image, and amendment is weighted to the sub-pixel of performance change, until the uniform gray level distribution of all sub-pixels in reference picture.This method can improve display effect in a manner of low cost in the case where that need not influence hardware or drive software compatibility.
Description
Technical field
Field of the disclosure on Display Technique, more specifically, on a kind of method of automated imaging amendment.
Background technology
Liquid crystal screen displays are generally included in the various equipment such as current computer, flat board, mobile phone.Liquid crystal display is general
For the display device of planar ultra-thin, it is made up of a number of colour element, these pixels are placed on light source or reflecting plate
Front is to produce image.More than three multiple sub-pixels are generally comprised in one colour element, each sub-pixel can configure
To show one kind in green, red or blueness, and each color in green, red or blueness comprises at least a sub- picture
Element.In use, the life-span of liquid crystal display is generally 5 years or so.It is some in liquid crystal display after long-time use
In pixel or sub-pixel probably due to a variety of causes such as threshold voltage shift, water inlet, high temperature, aging and cause brightness, contrast,
The parameters such as saturation degree change, in some instances it may even be possible to produce short circuit or open circuit etc. and form bad point.In addition, each color sub-pixel
Performance curve simultaneously differs, may some colors sub-pixel than other colors earlier or be easier performance change occur.It is right
For user, is there is uneven or noise spot by the deterioration of sub-pixel in the color for causing screen display.
Above-mentioned performance change may randomly occur in pixel on screen diverse location or in sub-pixel, to be occurred
Position is difficult to predict.Even if only it is that the performance changes of several pixels may also cause negative shadow directly perceived obvious to Consumer's Experience
Ring, such issues that be generally difficult to thoroughly be overcome by software or hardware maintenance means, generally require user change show
Device.Therefore a kind of method that pixel for liquid crystal screen displays performance change carries out automated imaging amendment is needed exist for, with
Just the influence of pixel performance change is mitigated in a manner of least cost in the case where being changed without new display.
The content of the invention
Embodiment of the disclosure is used for solving at least some above mentioned problems of the prior art, and provides a kind of to display
The method for carrying out automated imaging amendment, to find that performance produces the sub-pixel position of change, and in a manner of easy-operating pair
It is corrected automatically.This method comprises the following steps：Continuously display reference picture, adopted within the predetermined time cycle with first
Sample frequency determines the global mean value of the imaging corrected parameter of all sub-pixels of each color, and imaging corrected parameter is for every kind of face
Color changes according only to the grey scale change of sub-pixel, with true higher than the second sample frequency of the first sample frequency within the time cycle
Determine each sub-pixel of each color imaging corrected parameter indivedual average values, at least one sub-pixel indivedual average values with
At least one sub-pixel is labeled as performance change by the difference of global mean value more than in the case of the first predetermined reference threshold
Sub-pixel, determine amendment weight coefficient to performance according to the difference of indivedual average values and global mean value within next time cycle
The gray scale of change sub-pixel is modified, and is redefined within next time cycle in all sub- pictures of revised each color
Indivedual average values of the global mean value of the imaging corrected parameter of element and the imaging corrected parameter of each sub-pixel, and only exist
The difference of indivedual average values of each sub-pixel of each color and global mean value is no more than the first reference threshold after amendment
In the case of, stop the continuously display of reference picture.
This method can perform automatically within the idle time of the display such as screen protection program, not influence user
Determine to influence the deterioration sub-pixel of the uniformity of display in the case of use, and by carrying out corresponding compensation to it come need not
Influence to improve display effect in the case of hardware or drive software compatibility.
In certain embodiments, indivedual average values of at least one sub-pixel and the difference of global mean value exceed more than first
In the case of second reference threshold of reference threshold, to pixel where at least one sub-pixel and at least one sub-pixel
The gray scale of the sub-pixel of corresponding color in other multiple pixels of surrounding is modified all in accordance with amendment weight coefficient.
In certain embodiments, continuously display reference picture includes showing with the 3rd frequency cycle higher than second frequency
Show multiple color.
In certain embodiments, the imaging corrected parameter of each sub-pixel is defined as P=g+C1g3, wherein P is imaging amendment
Parameter, g are gray value, C1For the constant less than 1.
In certain embodiments, in indivedual average values of at least one sub-pixel and the difference of global mean value more than the second ginseng
In the case of examining threshold value, change the bit depth of at least one sub-pixel.
In certain embodiments, indivedual average values of each sub-pixel and global mean value in each time cycle are stored
Difference.
In certain embodiments, is exceeded more than in indivedual average values of at least one sub-pixel and the difference of global mean value
In the case of 3rd reference threshold of two reference thresholds, compare indivedual average values for storing before at least one sub-pixel with it is complete
The poor difference with currently determined indivedual average values and global mean value of office's average value.
In certain embodiments, in poor and currently determined of the indivedual average values and global mean value stored before
It is indivedual average according to what is stored before when difference between other average value and the difference of global mean value is more than the predetermined error upper limit
The difference of value and global mean value determines amendment weight coefficient.
In certain embodiments, in poor and currently determined of the indivedual average values and global mean value stored before
When difference between other average value and the difference of global mean value is less than or equal to the predetermined error upper limit, according to currently determined
The difference of other average value and global mean value determines amendment weight coefficient.
In certain embodiments, amendment weight coefficient is proportional to d ln (| d |), and wherein d is that indivedual average values are put down with the overall situation
The difference of average.
Above-described embodiment of the disclosure helps to provide a kind of easy-to-use and inexpensive display imaging modification method, the party
Method can in an efficient way positioning performance deterioration sub-pixel, and pass through to deterioration sub-pixel and its surrounding pixel sub- picture
The weighting correction-compensation that the gray scale of element be best suitable under different situations is influenceed with mitigating caused by performance degradation.
Brief description of the drawings
Present disclose provides accompanying drawing to illustrate some nonrestrictive examples according to disclosure principle, rather than is used for
Form any restrictions.
Fig. 1 is the schematic diagram for showing sub-pixel structure in pixel.
Fig. 2 is the flow chart according to the method and step of the embodiment of the present disclosure.
Embodiment
Term first, second, third, upper and lower, left and right etc. are not intended to limit the particular location of element, appoint without in definition
Where to or limitation sequentially.Preferred embodiments disclosed herein only for facilitating the understanding of those skilled in the art, and
It is not limited to the scope of the present disclosure, the scope of the present disclosure is included in various equivalent under the principle of disclosed embodiment or replaced
For the embodiment of property, and those skilled in the art can be from the content that the disclosure is apparently inferred to.
As shown in figure 1, each pixel of display generally comprises at least one red sub-pixel 10 in the prior art, at least
One blue subpixels 11, and at least one green sub-pixels 12.The sub-pixel of three kinds of colors can shape as an entirety
Into a colour element.Because the size of pixel is smaller, observing the user of display a long way off can not apparently tell in pixel
Sub-pixel, but can only see a bright spot.RGB sub-pixels in pixel can have different brightness or ash with various
Degree, so that user sees different colours.For example, when three kinds of color gray values are 0, user will be seen that black, and
When three kinds of color gray values are maximum (such as 255), user will be seen that white.Because the quantity of pixel is probably millions of
It is even more more, it is difficult to avoid some of which pixel and sub-pixel from occurring brightness, right in process of production or during use
Than the change of the parameters such as degree, saturation degree.This is will appear as with other parts in the image observed by human eye with obvious right
The noise of ratio, so as to influence Consumer's Experience.
As shown in Fig. 2 the method being modified is imaged to display automatically for such case first in step S101
Continuously display reference picture.A kind of color or a variety of different colors can be periodically shown with certain refreshing frequency.It is excellent
Selection of land, this can show successively when display screen protects image to three kinds of colors of red, green, blue.In addition it is also possible to aobvious
Show and a kind of color beyond three kinds of colors of red, green, blue is simply shown during screen saver image, such as white.
In step s 102, the gray value of all sub-pixels of each color is determined with the first sample frequency.For on screen
All pixels, respectively read the sub-pixels of RBG tri- gray value and stored.First sample frequency should show less than display
Show the refreshing frequency of reference picture.For example, when the reference picture of certain color is shown over the display according to 20Hz frequency,
First sample frequency can be defined as 2Hz.Then the gray value of each sub-pixel is calculated as corrected parameter, imaging amendment
Parameter is preferably P=g+C1g3, wherein P is imaging corrected parameter, and g is for sub-pixel gray value or sub-pixel gray value and jointly
Benchmark gray value difference, C1It for the constant less than 1, and can be negative, but be not zero.C1For the sub-pixel of different colours
There can be different values.Above-described imaging corrected parameter can provide the relatively balanced amendment degree of accuracy and detection spirit
Sensitivity.Those skilled in the art can define the imaging corrected parameter of modification according to type of display and pixel etc., with symbol
Close different types of characteristic curve.For example, P=(g-G)+C can be defined1(g-G)3, wherein G is being somebody's turn to do defined in reference picture
The benchmark gray value of color sub-pixels, P=g+C can also be defined for the more long display of usage time1Ln (g), with more
Meet its gray scale and the functional relation of access times.In a predetermined automatic amendment cycle, it is assumed that with the first sample frequency
N times sampling (N has been carried out to a kind of color>1) the imaging corrected parameter of each sub-pixel, calculated in n times sampling is by phase
The quantity of adduction divided by N and sub-pixel, so as to calculate the global mean value of sub-pixel imaging corrected parameter.Because sub-pixel quantity
Larger, the numerical value change of global mean value is little, so not needing the first too high sample frequency.
In step s 103, in the same automatic amendment cycle, to show higher than the first sample frequency and less than display
Show that the second sample frequency of the refreshing frequency of reference picture determines the respective gray value of each sub-pixel of each color.Adopted with second
Sample frame when sample frame when sample frequency is sampled with the first sample frequency with being sampled preferably mutually staggers, to subtract
The influence of small error.Since it is desired that there is the sub-pixel changed, it is necessary to be adopted with higher frequency such as 10Hz in search performance
Sample.Assuming that in the automatic amendment cycle, M sampling (M has been carried out to a kind of color with the second sample frequency>N>1), at M times
The gray value of each sub-pixel calculated in sampling be added and divided by M repaiied with obtaining the imaging of each sub-pixel of this kind of color
Indivedual average values of positive parameter.
The global mean value calculated in step S104 according to above-mentioned steps and indivedual average values, if at least one son
Indivedual average values of pixel and the difference of global mean value exceed the first predetermined reference threshold, then by least one sub-pixel mark
It is designated as performance change sub-pixel.First reference threshold can be defined as being imaged the predetermined percentage of corrected parameter, as difference reaches
To the 20% of global mean value, then show for visually more obvious, it is necessary to be modified.The performance change of every kind of different colours
The position of pixel is possibly different from where sub-pixel, may only have a sub-pixel performance change occur in some pixels, and
There may be multiple sub-pixels performance change occur in other pixels.
In step S105, in next automatic amendment cycle after the above-mentioned automatic amendment cycle, according to upper one certainly
The gray scale that the indivedual average values and the difference of global mean value that the dynamic amendment cycle is calculated change sub-pixel to all properties determines to repair
Positive weight coefficient is to be modified.Preferably, because due to sub-pixel gray scale caused by the factors such as aging reduction probably with
Access times approximation meets logarithmic curve, it is possible to which it is C to make amendment weight coefficient direct ratio2D ln (| d |), wherein d is above-mentioned
The difference of indivedual average values and global mean value in the upper one automatic amendment cycle calculated in step, and C2For constant.D can be
Positive number either negative, and can include being added with amendment weight coefficient according to correcting weight coefficient and being modified, subtract each other,
It can include amendment weight coefficient is normalized and is multiplied afterwards.
In step s 106, within next automatic amendment cycle, also redefine and carried out according to amendment weighting system
The global mean value of imaging corrected parameter of revised all sub-pixels of each color and the imaging amendment of each sub-pixel
Indivedual average values of parameter.The computational methods for redefining global mean value and indivedual average values correct the cycle automatically with upper one
Numerical procedure used is consistent during interior calculating.And only revised each color each sub-pixel indivedual average values with
In the case that the difference of global mean value is no more than the first reference threshold determined by upper one automatic amendment cycle, stop ginseng
The continuously display of image is examined, has now successfully completed automatic amendment without into next cycle.If difference is still above the
One reference threshold, then continue to show reference picture, be modified again within another lower automatic amendment cycle, until all colours
All sub-pixels complete amendment.
More seriously cause with surrounding pixel contrast strongly in pixel qualities deterioration, or pixel has been changed to bright spot or dark
In the case of the bad points such as point, only the pixel is modified and still can be found by user.Now, one is set to be more than the first reference
Second reference threshold of threshold value, show when the indivedual average values of sub-pixel and the difference of global assessment value exceed second reference threshold
Need to carry out extra amendment.Therefore to pair in other multiple pixels where the sub-pixel and the sub-pixel around pixel
The gray scale of the sub-pixel of color is answered to be modified all in accordance with amendment weight coefficient.Multiple pixels of surrounding can surround the sub- picture
One circle adjacent pixel of pixel where plain.Surrounding pixel, which is modified, can reduce the performance change sub-pixel on screen
Contrast, improve Consumer's Experience.In addition, also alternatively the bit depth of the sub-pixel is changed, such as can be from 8 increases
To 16, to improve higher automatic amendment precision.
Because the performance of pixel typically will not all produce large change in automatic amendment every time, in order to save computer money
Source, it can not have to be recalculated into as corrected parameter and indivedual average values and global mean value in each automatic amendment cycle
Difference, but each indivedual average values of sub-pixel and the difference of global mean value in a time cycle can be stored.Now, if
Fixed the 3rd reference threshold for being more than the second reference threshold, it correspond to the difference between indivedual average values and global mean value
The situation of bad point is even had been over, this is usually measurement error or the wrong data caused by calculation error, it is impossible to
Corrected automatically on the basis of this.Because this automatic amendment cycle is over, it is impossible to re-start measurement again, it is necessary to according to
The difference of indivedual average values and global mean value in the automatic amendment cycle of stored upper one is calculated.Further
On the basis of three reference thresholds set an error upper limit, such as 20%, if indivedual average values of the current calculating of sub-pixel with
The difference of global mean value then further compares the indivedual average values stored before the sub-pixel and the overall situation more than the 3rd reference threshold
The difference of the poor and currently determined indivedual average values and global mean value of average value is to determine whether to be regarded as error.
The indivedual average values and the poor difference with currently determined indivedual average values and global mean value of global mean value stored before
Between difference when being more than the predetermined above-mentioned error upper limit, according to the difference of the indivedual average values and global mean value stored before really
The positive weight coefficient of periodical repair rather than according between the indivedual average values and the difference of global mean value currently calculated difference determine amendment
Weight coefficient, so as to avoid the amendment of mistake.
Described above is only example embodiment of the principle of the present invention with the scope of, and those skilled in the art are reading this
Other equivalent integers being readily apparent that after text should also belong within scope of the invention.
Claims (10)
- A kind of 1. method that automated imaging amendment is carried out to display, it is characterised in that comprise the following steps：Continuously display reference picture；The complete of the imaging corrected parameter of all sub-pixels of each color is determined with the first sample frequency within the predetermined time cycle Office's average value, the imaging corrected parameter change for each color according only to the grey scale change of sub-pixel；Determine each color per height picture with the second sample frequency higher than first sample frequency within the time cycle Indivedual average values of the imaging corrected parameter of element；In the indivedual average values and the difference of the global mean value of at least one sub-pixel threshold is referred to more than predetermined first At least one sub-pixel is labeled as performance change sub-pixel in the case of value；Determine to correct according to indivedual average values and the difference of the global mean value within next time cycle Weight coefficient is modified to the gray scale of the performance change sub-pixel；The imaging in all sub-pixels of revised each color is redefined within next time cycle Indivedual average values of the global mean value of corrected parameter and the imaging corrected parameter of each sub-pixel；AndOnly revised each color each sub-pixel indivedual average values and the global mean value difference not In the case of more than first reference threshold, stop the described continuously display of reference picture.
- 2. the method as described in claim 1, it is characterised in that be additionally included in indivedual average values of at least one sub-pixel In the case of exceeding more than the second reference threshold of first reference threshold with the difference of the global mean value, to this at least one The sub-pixel of the corresponding color in other multiple pixels where individual sub-pixel and at least one sub-pixel around pixel Gray scale is modified all in accordance with the amendment weight coefficient.
- 3. method as claimed in claim 2, it is characterised in that the wherein continuously display reference picture is included with higher than described Show multiple color to 3rd frequency cycle of second frequency.
- 4. method as claimed in claim 3, it is characterised in that the imaging corrected parameter of wherein each sub-pixel is defined as：P=g+C1g3, wherein P is imaging corrected parameter, and g is gray value, C1For the constant less than 1.
- 5. method as claimed in claim 4, it is characterised in that be additionally included in indivedual average values of at least one sub-pixel In the case of exceeding second reference threshold with the difference of the global mean value, change the locating depth of at least one sub-pixel Degree.
- 6. method as claimed in claim 5, it is characterised in that also include each sub-pixel in storage each time cycle Indivedual average values and the difference of the global mean value.
- 7. method as claimed in claim 6, it is characterised in that be additionally included in indivedual average values of at least one sub-pixel In the case of exceeding more than the 3rd reference threshold of second reference threshold with the difference of the global mean value, compare this at least The indivedual average values stored before one sub-pixel and the global mean value it is poor with it is currently determined described indivedual Average value and the difference of the global mean value.
- 8. the method described in claim 7, it is characterised in that wherein in the indivedual average values and the overall situation stored before The poor difference between the difference of currently determined indivedual average values and the global mean value of average value is more than predetermined The error upper limit when, determine that the amendment weights according to the indivedual average values and the difference of the global mean value that store before Coefficient.
- 9. the method described in claim 8, it is characterised in that wherein in the indivedual average values and the overall situation stored before The poor difference between the difference of currently determined indivedual average values and the global mean value of average value is less than or waited When the predetermined error upper limit, repaiied according to determining the indivedual average values and the difference of the global mean value that currently determine Positive weight coefficient.
- 10. the method described in claim 9, it is characterised in that wherein described amendment weight coefficient is proportional to d ln (| d |), wherein D is indivedual average values and the difference of the global mean value.
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| CN113539153A (en) * | 2021-07-27 | 2021-10-22 | 厦门大学 | Method for repairing four-primary-color display screen dead pixel |
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