CN106205488A - Extend method and the display device in display of organic electroluminescence life-span - Google Patents
Extend method and the display device in display of organic electroluminescence life-span Download PDFInfo
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- CN106205488A CN106205488A CN201610839051.2A CN201610839051A CN106205488A CN 106205488 A CN106205488 A CN 106205488A CN 201610839051 A CN201610839051 A CN 201610839051A CN 106205488 A CN106205488 A CN 106205488A
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000005401 electroluminescence Methods 0.000 title claims abstract description 21
- 230000003679 aging effect Effects 0.000 claims abstract description 40
- 238000004364 calculation method Methods 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims description 10
- 238000013316 zoning Methods 0.000 claims description 7
- 208000015181 infectious disease Diseases 0.000 abstract description 4
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- 230000009467 reduction Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
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- 239000004973 liquid crystal related substance Substances 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
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Abstract
The invention discloses a kind of method extending the display of organic electroluminescence life-span, including: display screen is divided into many sub regions；Calculate the aging effects factor of each described subregion；Characteristics of image according to each described subregion and the brightness ratio coefficient of the described aging effects factor each described subregion of calculating；Actual displayed brightness according to display screen described in described brightness ratio coefficient calculations；Image is exported according to described actual displayed brightness.The present invention also provides for a kind of display device.For Consideration calculating brightness ratio coefficient and brightness processed is carried out with the aging effects factor and characteristics of image, reduce the destroying infection to overall image quality, just gray level mixing subregion selects to increase or reduce strength disposal according to the simple of image and complexity and this subregion location, brightness of image is adjusted on the premise of ensureing picture quality impact, delay OLED to fail, extend the OLED life-span.
Description
Technical field
The present invention relates to Display Technique field, especially relate to a kind of method extending the display of organic electroluminescence life-span
And display device.
Background technology
Display of organic electroluminescence (Organic Light Emitting Diode, OLED) has high-contrast, low
The advantages such as power consumption, response time are short, wide viewing angle and pliability so that it is attracted substantial amounts of concern.But OLED display exists
Serious luminance degradation and life time decay problem.The decline rate of OLED and display brightness positive correlation, i.e. brightness height decline is fast, bright
Spending low decline slow, the main method delaying OLED to fail is to reduce the display brightness in high grade grey level region in image.
In prior art, the processing mode of a kind of OLED of delaying decline is to arrange a brightness maxima, will be above brightness
The gray level of maximum all shows with this brightness, but the method can cause high grade grey level generation gray scale to be blocked, missing image
Details, affects picture quality；Another kind of processing mode is by display brightness all linear reduction interval for whole gray scale, make gray scale with
Brightness curve remains in that monotonic increase, will not produce gray scale and block, but reduces the high grade grey level brightness bigger to aging effects
While, also can reduce the brightness of the low gray level little to aging effects, cause image entirety the darkest；Other processing modes are also
Including, when the brightness keeping low gray level is constant, the brightness range of compression high grade grey level, both reduced the brightness of high grade grey level,
Maintain the monotone increasing of gray scale-brightness curve, do not produce gray scale and block, in turn ensure that the brightness of image of low gray areas is not by shadow
Ring, but for there is the high-contrast area of height gray level simultaneously, the method can reduce the contrast in this region.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method extending the display of organic electroluminescence life-span and shows
Show equipment, OLED cannot be delayed to fail on the premise of picture quality is not by considerable influence ensureing in order to solving in prior art
Problem.
For solving above-mentioned technical problem, on the one hand, the present invention provides a kind of and extends display of organic electroluminescence life-span
Method, including:
Display screen is divided into many sub regions；
Calculate the aging effects factor of each described subregion；
Characteristics of image and the described aging effects factor according to each described subregion calculate the bright of each described subregion
Degree proportionality coefficient；
Actual displayed brightness according to display screen described in described brightness ratio coefficient calculations；
Image is exported according to described actual displayed brightness.
Further, characteristics of image and the described aging effects factor according to each described subregion calculate each described sub-district
The brightness ratio coefficient in territory, including:
The institute of the central pixel point according to each described subregion of the described aging effects factor and described box counting algorithm
State brightness ratio coefficient；
The described brightness ratio coefficient of the rest of pixels point of each described subregion is calculated by interpolation method.
Further, the described brightness ratio system of the described rest of pixels point being calculated each described subregion by interpolation method
Number, including:
Calculate the described brightness ratio system of the described rest of pixels point of the edge subregion being positioned at described display screen edge
During number, stretch out extension subregion from described edge subregion, and the described central pixel point of described extension subregion
Described brightness ratio coefficient value is equal with the described brightness ratio coefficient value of the described central pixel point of described edge subregion, logical
Cross the described brightness ratio coefficient that interpolation method calculates the described rest of pixels point of each described edge subregion.
Further, after the described actual displayed brightness according to display screen described in described brightness ratio coefficient calculations, institute
Method of stating also includes:
Detect the picture quality the most satisfied display requirement of the image shown according to described actual displayed brightness；
If meeting described display requirement, export image,
If being unsatisfactory for described display requirement, recalculate the described brightness ratio coefficient of each described subregion.
Further, the most satisfied display of the picture quality of the image that described detection shows according to described actual displayed brightness is wanted
Ask, including:
Calculate the Y-PSNR of the image shown according to described actual displayed brightness,
When described Y-PSNR is not less than Y-PSNR threshold value, export image,
When described Y-PSNR is less than described Y-PSNR threshold value, recalculate the described of each described subregion
Brightness ratio coefficient.
Further, the most satisfied display of the picture quality of the image that described detection shows according to described actual displayed brightness is wanted
Ask, including:
Calculate the difference of the mean flow rate of original image and the mean flow rate of described actual displayed brightness,
When described difference is less than difference threshold, export image,
When described difference is not less than described difference threshold, recalculate the described brightness ratio system of each described subregion
Number.
Further, the described aging effects factor is the weighted average levels of each described subregion.
On the other hand, the present invention also provides for a kind of display device, and described display device includes time schedule controller, described sequential
Controller includes:
Zoning unit, for being divided into many sub regions by display screen；
Computing unit, for calculating the aging effects factor of each described subregion, and according to each described subregion
Characteristics of image and the described aging effects factor calculate the brightness ratio coefficient of each described subregion, and according to described brightness
Proportionality coefficient calculates the actual displayed brightness of described display screen.
Further, described processor also includes detector unit, the figure shown according to described actual displayed brightness for detection
Whether the picture quality of picture meets display requirement；
If meeting described display requirement, export image,
If being unsatisfactory for described display requirement, recalculate the described brightness ratio coefficient of each described subregion.
Further, described computing unit is additionally operable to calculate the peak value noise of the image shown according to described actual displayed brightness
Ratio, and calculate the difference of the mean flow rate of original image and the mean flow rate of described actual displayed brightness.
Beneficial effects of the present invention is as follows: display screen is divided into many sub regions the picture of the every sub regions of individual processing
The brightness of vegetarian refreshments, result of calculation is accurate, and brightness processed precision is high, and with the aging effects factor and characteristics of image as Consideration
Calculating brightness ratio coefficient and carry out brightness processed, low gray level subregion does not make brightness processed, and high grade grey level increases at brightness
Reason dynamics, reduces the destroying infection to overall image quality, and just gray level mixing subregion according to the simple of image and is answered
Miscellaneous degree and this subregion location select to increase or reduce strength disposal, it is ensured that adjust on the premise of picture quality impact
Brightness of image, delays OLED to fail, and extends the OLED life-span.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other obvious mode of texturing is obtained according to these accompanying drawings.
The method flow schematic diagram extending the display of organic electroluminescence life-span that Fig. 1 provides for embodiments of the invention.
The input gray grade of the method extending the display of organic electroluminescence life-span that Fig. 2 provides for embodiments of the invention
Relation curve with output gray level.
The display screen of the method extending the display of organic electroluminescence life-span that Fig. 3 provides for embodiments of the invention
The method dividing subregion.
The device schematic diagram of the display device that Fig. 4 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
The embodiment of the present invention provides a kind of method extending the display of organic electroluminescence life-span and display device, can extend
The display of organic electroluminescence life-span.In implementing, the display device described in the embodiment of the present invention may include but be not limited to:
The display devices such as liquid crystal display, mobile phone, panel computer.
Seeing Fig. 1, Fig. 1 is the method flow extending the display of organic electroluminescence life-span that embodiments of the invention provide
Schematic diagram.The method in described prolongation display of organic electroluminescence life-span can be held by the hardware of software system control display device
OK.As it is shown in figure 1, described method can comprise the steps:
S101, inputs original image.
Display device driving circuit receives the digital signal that system board is inputted by system interface, and digital signal contains
The image information that system board provides.Concrete, digital signal includes that RGB data signal, data sampling clock signal, data make
Energy signal, line synchronising signal and frame synchronizing signal.The original image that image information is display device of system board input, original
Brightness of image is higher, and OLED display shows that original image there will be the problem of serious luminance degradation and life time decay for a long time,
Therefore need the follow-up brightness to original image to be processed to delay OLED to fail, extend the life-span of OLED display.
S102, is divided into M × N number of subregion by display screen.
The display screen that resolution is m × n is divided into M × N number of subregion, wherein the span of M and N be 1≤M≤
M, 1≤N≤n.The brightness of the pixel of the every sub regions of individual processing, result of calculation is accurate, and brightness processed precision is high, M's and N
It is worth the biggest, sub-zone dividing the most careful, the precision of brightness processed is the highest, and brightness processed is the least on the impact of picture quality, but
Amount of calculation can be increased.
S103, calculates the aging effects factor of every sub regions.
The aging effects factor is each sub-region right average level, reflects low gray level and high grade grey level region to OLED's
The difference of aging effects, the computing formula of the aging effects factor is
η represents the aging effects factor of every sub regions, and G represents the grey scale table indicating value of pixel data, and T represents peak value ash
Degree level, if input digital of digital video data is 8, then the value of peak grayscale level is 255, and wherein, n represents according to panel characteristics and answers
The constant determined by factors such as environment.The weighted average levels of low gray level subregion is little, and display brightness is low, to the OLED longevity
The impact of life is the least, therefore need not process the brightness of low gray level region；The weighted average of high grade grey level subregion
Level is big, and display brightness is high, and the impact on the OLED life-span is the biggest, therefore needs the brightness increase to high grade grey level region to process power
Degree.
S104, calculates the brightness ratio coefficient of every sub regions.
Every sub regions includes multiple pixel, first calculates the brightness ratio system of the central pixel point of every sub regions
Number, then the brightness ratio coefficient of the rest of pixels point of every sub regions is calculated by interpolation method.Wherein, in every sub regions
The computational methods of the brightness ratio coefficient of imago vegetarian refreshments are as follows:
Due to decline rate and the display brightness positive correlation of OLED, i.e. brightness height decline is fast, and the low decline of brightness is slow, display screen
All subregions of curtain are divided into low gray level subregion, high grade grey level subregion according to display brightness and there is height ash simultaneously
The subregion of degree level pixel, calculates brightness ratio coefficient by the aging effects factor of reflection brightness.
Concrete, the weighted average levels of low gray level subregion is less, and brightness is low, and the aging effects factor is less, is not required to
Brightness processed to be carried out, the value of brightness ratio coefficient is 1；The weighted average levels of high grade grey level subregion is relatively big, and brightness is high, the longevity
Life factor of influence is relatively big, needs to increase the strength disposal to brightness, and the value of brightness ratio coefficient is between 0～1, and life-span shadow
Ringing the factor the biggest, brightness ratio coefficient is the least.
The subregion that simultaneously there is high and low gray-level pixels point introduces box counting algorithm brightness ratio coefficient, in conjunction with figure
2, input gray grade (original image) dynamically changes according to characteristics of image with the relation curve of output gray level.Characteristics of image includes
Simple or the complexity of the picture material of subregion and subregion position on the display screen.Concrete, picture material is relatively
Comprise the less region of image information for simple region and screen edge region usually image background etc., be not that observer
The region heavily noticed, therefore need the region fairly simple to picture material or screen edge region to increase strength disposal, brightness ratio
Example coefficient is less；Region that picture material is complex and screen center region contain the main information of image, see often
The region that the person of examining more notices, therefore need the region more complicated to picture material or screen center region to reduce strength disposal,
Brightness ratio coefficient is bigger.
The brightness ratio coefficient calculation method of the central pixel point of every sub regions combines the aging effects factor and image
Feature, low gray level subregion brightness ratio coefficient value is 1, does not carry out brightness processed, and low gray level subregion keeps original graph
The picture quality of picture；High grade grey level subregion brightness ratio coefficient value is between 0～1, increases brightness processed dynamics, high grade grey level
Subregion reduces brightness display alleviates OLED luminance degradation and life time decay；There is high and low gray-level pixels Dian Zi district simultaneously
Territory is according to box counting algorithm brightness ratio coefficient, it is ensured that between pixel, brightness is not undergone mutation, and maintains in this subregion
Contrast, it is ensured that adjust brightness of image on the premise of picture quality impact, delay OLED to fail, extend the OLED life-span.
In the present embodiment, after the brightness ratio coefficient of the central pixel point obtaining every sub regions, by interpolation method meter
Calculate the brightness ratio coefficient of the rest of pixels point of every sub regions.Further, in conjunction with Fig. 3, calculate and be positioned at display screen edge
The brightness ratio coefficient of rest of pixels point of edge subregion time, stretch out extension subregion from edge subregion, and
The brightness ratio coefficient value of the central pixel point of extension subregion and the brightness ratio coefficient of the central pixel point of edge subregion
It is worth equal, is calculated the brightness ratio coefficient of the rest of pixels point of each edge subregion by interpolation method.As it is shown on figure 3, the 1st
A line extension subregion is respectively extended in the lower section of the top of row subregion and M row subregion, the left of the 1st row subregion with
String extension subregion is respectively extended in the right of Nth column subregion.Maintain according to the OLED after this brightness ratio coefficient processing
The monotone increasing of gray scale-brightness curve, does not produce gray scale and blocks, and in turn ensure that the brightness of image of low gray areas is unaffected, right
In the subregion of the high-contrast that there is high and low gray level simultaneously, maintain the contrast in this subregion.
S105, according to the actual displayed brightness of brightness ratio coefficient calculations display screen.
Concrete, according to brightness ratio coefficient calculations corresponding to each pixel original image after brightness processed
Actual displayed brightness.
S106, whether detection picture quality meets display requirement.
Concrete, detect the picture quality the most satisfied display requirement of the image shown according to actual displayed brightness, if full
Foot display requirement, then display screen output image；If being unsatisfactory for showing requirement, then recalculate the brightness ratio of every sub regions
Coefficient.
In a kind of embodiment, by calculating the Y-PSNR detection figure picture element of the image shown according to actual displayed brightness
Whether amount meets display requirement.Y-PSNR is the destructive noise of the precision representing signal maximum possible power with affecting it
The ratio of power, it is the objective measurement approach of most common criticism image quality.Concrete, Y-PSNR computing formula is
Wherein, PSNR represents the Y-PSNR of output image, and MSE represents input and the mean square deviation of output image, specifically
,
Wherein, N and M represents the input picture pixel number in horizontally and vertically direction, g respectivelyrefAnd ginRepresent respectively
With original image at (x, y) gray-scale value of pixel after process.
PSNR value is the biggest, represents distortion the fewest.To the image after reduction brightness processed, PSNR value is more more than PSNR threshold value,
Picture quality is the best, and selected brightness ratio coefficient is the most reasonable, wherein, and the figure that PSNR threshold value finally exports according to display device
The actual image quality of picture requires to determine.Further, when PSNR value is not less than PSNR threshold value, the image after process meets display to be wanted
Ask, display screen output image；When PSNR value is less than PSNR threshold value, the image after process is unsatisfactory for showing requirement, again counts
Calculate the brightness ratio coefficient of every sub regions.
In a kind of embodiment, by the difference of the mean flow rate of calculating original image with the mean flow rate of actual displayed brightness
Whether value detection picture quality meets display requirement, and this difference reflects the difference of actual displayed brightness and original image brightness.
Concrete, the mean flow rate of original image with the mathematic interpolation formula of the mean flow rate of actual displayed brightness is
Wherein, N and M represents the original image pixel number in horizontally and vertically direction, L respectivelyrefAnd LinRepresent respectively
After process and original image is (x, y) brightness value of pixel, MB value is the least, and the brightness of actual displayed brightness and original image is got over
Close, the image after process is the least with the picture quality difference of original image.MB value is more less than MB threshold value, and picture quality is the best,
Selected brightness ratio coefficient is the most reasonable, and wherein, the actual image quality of the image that MB threshold value finally exports according to display device is wanted
Ask decision.Further, when difference is less than MB threshold value, the image after process meets display requirement, display screen output image；
When difference is not less than MB threshold value, the image after process is unsatisfactory for showing requirement, recalculates the brightness ratio of every sub regions
Coefficient.
Detect picture quality show according to actual displayed brightness whether to meet and show requirement, it is to avoid partial pixel point due to
The aging effects factor and/or the improper situation causing image quality loss bigger of box counting algorithm, be unsatisfactory for what display required
The brightness ratio coefficient of its correspondence will be recalculated by actual displayed brightness, can suitably regulate the longevity during recalculating
The life factor of influence impact on brightness ratio coefficient, it is also possible to change the characteristics of image impact on brightness ratio coefficient.
S107, exports image.
Concrete, after the image satisfied display requirement after testing after process, OLED shows image according to actual displayed brightness.
Display screen is divided into the brightness of the pixel of many sub regions the every sub regions of individual processing, result of calculation essence
Really, brightness processed precision is high, and goes forward side by side with the aging effects factor and characteristics of image for Consideration calculating brightness ratio coefficient
Row brightness processed, low gray level subregion is not made brightness processed, high grade grey level increase brightness processed dynamics, is reduced overall diagram
The destroying infection of picture element amount, just gray level mixing subregion is according to residing for the simple of image and complexity and this subregion
Position selects to increase or reduce strength disposal, it is ensured that adjusts brightness of image on the premise of picture quality impact, delays OLED to fail,
Extend the OLED life-span.
The present invention also provides for a kind of display device, and this display device includes display floater and drive circuit, and drive circuit drives
Dynamic display floater work.Wherein, drive circuit includes time schedule controller (TCON), data drive circuit, scan drive circuit etc..
In the present embodiment, time schedule controller 100 can be special IC (ASIC), FPGA or microcontroller etc..See Fig. 4,
Fig. 4 is the device schematic diagram of the time schedule controller 100 that the embodiment of the present invention provides.As shown in Figure 4, time schedule controller 100 includes:
Zoning unit 101, computing unit 102, detector unit 103.In certain embodiments, zoning unit 101, computing unit 102, inspection
Surveying unit 103 is the programmed instruction that can be called execution by time schedule controller 100.In further embodiments, zoning unit 101,
Computing unit 102, detector unit 103 are the circuit structure in time schedule controller 100.
Zoning unit 101 for being divided into many sub regions by display screen.Concrete, zoning unit 101 is by resolution
Display screen for m × n is divided into M × N number of subregion, and wherein the span of M and N is 1≤M≤m, 1≤N≤n.Individually place
Managing the brightness of the pixel of every sub regions, result of calculation is accurate, and brightness processed precision is high, and the value of M and N is the biggest, and subregion is drawn
That divides is the most careful, and the precision of brightness processed is the highest, and brightness processed is the least on the impact of picture quality, but can increase computing unit
102 amounts of calculation.
Computing unit 102 is used for calculating the aging effects factor of every sub regions, and according to the image of every sub regions
Feature and the aging effects factor calculate the brightness ratio coefficient of every sub regions, and according to brightness ratio coefficient calculations display screen
The actual displayed brightness of curtain.
Concrete, computing unit 102 carries out process calculated as below successively:
1, the aging effects factor of every sub regions is calculated.
The aging effects factor is each sub-region right average level, reflects low gray level and high grade grey level region to OLED's
The difference of aging effects, the computing formula of the aging effects factor is
η represents the aging effects factor of every sub regions, and G represents the grey scale table indicating value of pixel data, and T represents peak value ash
Degree level, if input digital of digital video data is 8, then the value of peak grayscale level is 255, and n represents according to panel characteristics and application ring
The constant that the factors such as border determine.
2, the brightness ratio coefficient of every sub regions is calculated.
The brightness ratio coefficient calculation method of the central pixel point of every sub regions combines the aging effects factor and image
Feature, concrete, the weighted average levels of low gray level subregion is less, and brightness is low, and the aging effects factor is less, it is not necessary to enter
Row brightness processed, the value of brightness ratio coefficient is 1；The weighted average levels of high grade grey level subregion is relatively big, and brightness is high, life-span shadow
Ringing the factor relatively big, need to increase the strength disposal to brightness, the value of brightness ratio coefficient is between 0～1, and aging effects because of
Son is the biggest, and brightness ratio coefficient is the least.
The subregion that simultaneously there is high and low gray-level pixels point then introduces box counting algorithm brightness ratio coefficient.Image
Feature includes the simple of the picture material of subregion or complexity and subregion position on the display screen.Concrete, figure
The region relatively simple as content and screen edge region usually image background etc. comprise the less region of image information, are not
The region that observer notices emphatically, therefore need the region fairly simple to picture material or the increase of screen edge region to process power
Degree, brightness ratio coefficient is bigger；Region that picture material is complex and screen center region contain the main information of image,
The region that observer more notices often, therefore need at the region more complicated to picture material or screen center's region reduction
Reason dynamics, brightness ratio coefficient is less.
3, the actual displayed brightness of display screen is calculated.
Concrete, according to brightness ratio coefficient calculations corresponding to each pixel original image after brightness processed
Actual displayed brightness.
4, calculate the Y-PSNR of the image shown according to actual displayed brightness, and calculate the brightest of original image
The difference of the mean flow rate of the image spent and show according to actual displayed brightness.
Concrete, Y-PSNR is the destructive noise power of the precision representing signal maximum possible power with affecting it
Ratio, it is the objective measurement approach of most common criticism image quality, and Y-PSNR computing formula is
Wherein, PSNR represents the Y-PSNR of output image, and MSE represents input and the mean square deviation of output image, specifically
,
Wherein, N and M represents the input picture pixel number in horizontally and vertically direction, g respectivelyrefAnd ginRepresent respectively
With original image at (x, y) gray-scale value of pixel after process.
PSNR value is the biggest, represents distortion the fewest.To the image after reduction brightness processed, PSNR value is more more than PSNR threshold value,
Picture quality is the best, and selected brightness ratio coefficient is the most reasonable, wherein, and the figure that PSNR threshold value finally exports according to display device
The actual image quality of picture requires to determine.
The difference of the mean flow rate of the mean flow rate of original image and actual displayed brightness reflect actual displayed brightness with
The difference of original image brightness.Concrete, the difference meter of the mean flow rate of the mean flow rate of original image and actual displayed brightness
Calculation formula is
Wherein, N and M represents the original image pixel number in horizontally and vertically direction, L respectivelyrefAnd LinRepresent respectively
After process and original image is (x, y) brightness value of pixel, MB value is the least, and the brightness of actual displayed brightness and original image is got over
Close, the image after process is the least with the picture quality difference of original image.MB value is more less than MB threshold value, and picture quality is the best,
Selected brightness ratio coefficient is the most reasonable, and wherein, the actual image quality of the image that MB threshold value finally exports according to display device is wanted
Ask decision.
Whether the picture quality of the image that detector unit 103 shows according to actual displayed brightness for detection meets display is wanted
Ask, if meeting display requirement, then display screen output image；If being unsatisfactory for showing requirement, then recalculate every sub regions
Brightness ratio coefficient.
In a kind of embodiment, the peak of the image that detector unit 103 is shown according to described actual displayed brightness by detection
Value signal to noise ratio judges whether picture quality meets display requirement, when Y-PSNR is not less than Y-PSNR threshold value, and display
Screen output image；When Y-PSNR is less than Y-PSNR threshold value, recalculate the described brightness ratio of every sub regions
Example coefficient.
In another embodiment, detector unit 103 is by detecting mean flow rate and the actual displayed brightness of original image
The difference of mean flow rate judge whether picture quality meets display requirement, when difference is less than difference threshold, display screen is defeated
Publish picture picture；When difference is not less than difference threshold, recalculate the brightness ratio coefficient of every sub regions.
Display screen is divided into the brightness of the pixel of many sub regions the every sub regions of individual processing, result of calculation essence
Really, brightness processed precision is high, and goes forward side by side with the aging effects factor and characteristics of image for Consideration calculating brightness ratio coefficient
Row brightness processed, low gray level subregion is not made brightness processed, high grade grey level increase brightness processed dynamics, is reduced overall diagram
The destroying infection of picture element amount, just gray level mixing subregion is according to residing for the simple of image and complexity and this subregion
Position selects to increase or reduce strength disposal, it is ensured that adjusts brightness of image on the premise of picture quality impact, delays OLED to fail,
Extend the OLED life-span.
Above disclosed it is only several preferred embodiment of the present invention, certainly can not limit the power of the present invention with this
Profit scope, one of ordinary skill in the art will appreciate that all or part of flow process realizing above-described embodiment, and weighs according to the present invention
Profit requires the equivalent variations made, and still falls within the scope that invention is contained.
Claims (10)
1. the method extending the display of organic electroluminescence life-span, it is characterised in that including:
Display screen is divided into many sub regions；
Calculate the aging effects factor of each described subregion；
Characteristics of image according to each described subregion and the brightness ratio of the described aging effects factor each described subregion of calculating
Example coefficient；
Actual displayed brightness according to display screen described in described brightness ratio coefficient calculations；
Image is exported according to described actual displayed brightness.
The method in prolongation display of organic electroluminescence life-span the most according to claim 1, it is characterised in that according to each
The characteristics of image of described subregion and the described aging effects factor calculate the brightness ratio coefficient of each described subregion, including:
Central pixel point according to each described subregion of the described aging effects factor and described box counting algorithm described bright
Degree proportionality coefficient；
The described brightness ratio coefficient of the rest of pixels point of each described subregion is calculated by interpolation method.
The method in prolongation display of organic electroluminescence life-span the most according to claim 2, it is characterised in that described in pass through
Interpolation method calculates the described brightness ratio coefficient of the rest of pixels point of each described subregion, including:
When calculating the described brightness ratio coefficient of described rest of pixels point of the edge subregion being positioned at described display screen edge,
Stretch out extension subregion from described edge subregion, and the described central pixel point of described extension subregion is described bright
Degree scalefactor value is equal with the described brightness ratio coefficient value of the described central pixel point of described edge subregion, passes through interpolation
Method calculates the described brightness ratio coefficient of the described rest of pixels point of each described edge subregion.
The method in prolongation display of organic electroluminescence life-span the most according to claim 3, it is characterised in that described basis
After the actual displayed brightness of display screen described in described brightness ratio coefficient calculations, described method also includes:
Detect the picture quality the most satisfied display requirement of the image shown according to described actual displayed brightness；
If meeting described display requirement, export image,
If being unsatisfactory for described display requirement, recalculate the described brightness ratio coefficient of each described subregion.
The method in prolongation display of organic electroluminescence life-span the most according to claim 4, it is characterised in that described detection
Whether the picture quality of the image shown according to described actual displayed brightness meets display requirement, including:
Calculate the Y-PSNR of the image shown according to described actual displayed brightness,
When described Y-PSNR is not less than Y-PSNR threshold value, export image,
When described Y-PSNR is less than described Y-PSNR threshold value, recalculate the described brightness of each described subregion
Proportionality coefficient.
The method in prolongation display of organic electroluminescence life-span the most according to claim 4, it is characterised in that described detection
Whether the picture quality of the image shown according to described actual displayed brightness meets display requirement, including:
Calculate the difference of the mean flow rate of original image and the mean flow rate of described actual displayed brightness,
When described difference is less than difference threshold, export image,
When described difference is not less than described difference threshold, recalculate the described brightness ratio coefficient of each described subregion.
The method in prolongation display of organic electroluminescence life-span the most according to claim 1, it is characterised in that described life-span
Factor of influence is the weighted average levels of each described subregion.
8. a display device, it is characterised in that described display device includes that time schedule controller, described time schedule controller include:
Zoning unit, for being divided into many sub regions by display screen；
Computing unit, for calculating the aging effects factor of each described subregion, and according to the figure of each described subregion
As feature and the described aging effects factor calculate the brightness ratio coefficient of each described subregion, and according to described brightness ratio
The actual displayed brightness of display screen described in coefficient calculations.
Display device the most according to claim 8, it is characterised in that described processor also includes detector unit, is used for examining
Survey the picture quality the most satisfied display requirement of the image shown according to described actual displayed brightness；
If meeting described display requirement, export image,
If being unsatisfactory for described display requirement, recalculate the described brightness ratio coefficient of each described subregion.
Display device the most according to claim 9, it is characterised in that described computing unit is additionally operable to calculate according to described
The Y-PSNR of the image that actual displayed brightness shows, and the mean flow rate calculating original image is bright with described actual displayed
The difference of the mean flow rate of degree.
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