CN106847176A - A kind of OLED life-spans improve algorithm and device - Google Patents
A kind of OLED life-spans improve algorithm and device Download PDFInfo
- Publication number
- CN106847176A CN106847176A CN201710121700.XA CN201710121700A CN106847176A CN 106847176 A CN106847176 A CN 106847176A CN 201710121700 A CN201710121700 A CN 201710121700A CN 106847176 A CN106847176 A CN 106847176A
- Authority
- CN
- China
- Prior art keywords
- oled
- brightness
- life
- module
- spans
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—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]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Abstract
Improve algorithm and device the invention discloses a kind of OLED life-spans, according to OLED brightness decay models, the life-span for proposing OLED luminescent devices with reference to OLED actual hardwares driving force and display effect improves algorithm.The life-span improvement algorithm of OLED luminescent devices is OLED with certain original intensity L0When lighting, when OLED brightness decays to LxWhen, by lifting the driving current of OLED or the method for voltage by OLED luminance raisings to Ly, while obtaining three optimized parameters, i.e. brightness decay lower limit L by optimized algorithmxValue, LyValue and lifting number of times mbest, so as to effectively reach the purpose in extension OLED life-spans.The present invention discloses realizing that the OLED life-spans improve the device of algorithm, the device calculates brightness data module comprising offset data module is calculated, and stores brightness data module, calculates attenuation degree module, storage attenuation degree module and detection judge module.
Description
Technical field
Improve algorithm and device the present invention relates to a kind of organic luminescent device (hereinafter referred to as OLED) life-span.According to OLED's
Brightness decay characteristic, corrects the brightness decay curve of OLED, considers hardware driving ability and the compensable maximums of OLED decline
Subtract degree αlimitImprove algorithm to the OLED life-spans to optimize, determine optimal improvement parameter；While the OLED longevity of the invention
Life improves algorithm and proposes that the OLED life-spans improve calculation device.The OLED life-spans improve algorithm and device can be applicable to OLED illuminations and show
The field such as show.
Background technology
Organic elctroluminescent device (Organic Light Emitting Diode) has self-luminous, and brightness is high,
Contrast is high, and fast response time, visual angle is wide, many advantages, such as simple structure and Flexible Displays, because its excellent performance attracts
The favor of colleges and universities and enterprise, obtains development at full speed.At present, the oled panel of small size has been successfully applied on mobile phone, but
There is brightness decay soon and display inhomogeneities in large scale OLED display, these problems constrain the development of OLED display.
Many researchs on OLED brightness decay mechanism at present show, mainly have time the reason for cause OLED brightness decays
Accumulation of the cave in composite bed[1], carrier introducing impurity[2]Migrated with indium[3]This three class ([1] Hosokawa C, Matsuura M,
Eida M,et al.Full-color organic EL display[J].SID,1998,6(4):257-260.[2]
Kondakov D.Y,J.R.Sandifer.Nonradiative recombination centers and electrical
aging of organic light-emitting diodes:Direct connection between accumulation
of trapped charge and luminance loss[J].Appl.Phys,2003,93(2):1108-1119.[3]
Shen J,Wang D,Langlois E,et al.Degradation mechanisms in organic light
emitting diodes[J].Synth.Metal,2000,111:233-236.).The life approach of extension OLED is main at present
It is divided into three major types:One is by the improvement of technique and improves and extend the OLED life-spans, and Main Means have improvement OLED production technologies
And packaging technology, or selection new material etc.；Two be in terms of circuit compensation extend OLED life-span, including internal circuit mend
Repay and compensated with external circuit, the method for wherein internal circuit compensation has the quantity for increasing TFT and electric capacity, the purpose is to improve TFT
The OLED life problems that threshold voltage shift causes, external circuit compensation method is the brightness decay degree for detecting OLED, according to
Brightness decay degree offset data voltage signal or current signal improve the OLED life-spans[4]([4]Kuei-Yu Lee,Yen-
Ping Hsu and Paul C.-P.Chao,A new compensation method for emission
degradation in an AMOLED display via an external algorithm,new pixel circuit,
and models of prior measurements[J].Journal of Display Technology,2014,10(3):
189-197.)；Three is that image processing method improves the OLED life-spans, as long as the brightness decay degree according to OLED, defeated by compensating
Enter image gradation data to improve the life-span of OLED.
With OLED productions and the continuous improvement of encapsulation technology technique and perfect, the life-span of OLED is improved from technique
It is increasingly difficult to breach；Internal circuit is compensated due to TFT to be increased and electric capacity quantity, aperture opening ratio can be caused to decline, therefore change
Kind OLED life-span limited efficacies；External circuit compensate and image processing method improve improve for the OLED life-spans exist it is unlimited
May, the research of large quantities of scholars has been concentrated, wherein Kyonghwan Oh et al. propose a kind of based on lifting OLED fluorescent lifetimes
The OLED life-spans of dutycycle improve algorithm and combine digital hardware circuits to be realized[5]([5]Kyonghwan Oh,Seong-Kwan
Hongand Oh-Kyong Kwon Lifetime Extension Method for Active MatrixOrganic
Light-Emitting Diode Displays Using a Modified Stretched Exponential Decay
Model, [J] IEEE Electron Device Letters, VOL.36, NO.3, March 2015), but the method is only fitted
For digital circuit, and the method does not account for actual displayed effect.
By above-mentioned compensation scheme, compensated i.e. by lifting OLED external voltages and current signal by external circuit
To compensate the decay of OLED, and need an anode voltage or OLED of accurate outer detecting circuit real-time detection OLED
Driving current.The display characteristic and application value of OLED, this hair are realized in order to obtain more preferable OLED life-spans ameliorative way
The bright brightness decay model based on OLED, it is proposed that the luminance compensation algorithm of OLED and the device of OLED luminance compensation algorithms, together
When combine actual hardware driving force and OLED own material properties and optimize and obtain one and take into account display effect and the life-span prolongs
Optimal compensation parameter long.The node that the present invention is lifted every time simultaneously is the true recession level that OLED is calculated by brightness data
α judges, determines without the method for external circuit detection, has both reduced the cost of hardware circuit, while improve
The accuracy that the OLED life-spans improve.
The content of the invention
It is an object of the invention to be directed to above-mentioned technical problem, in order to lift the life-span of OLED, it is proposed that a kind of OLED longevity
Life improves algorithm and device.
To achieve the above object, the present invention is adopted the following technical scheme that：
The present invention proposes the OLED life-spans improves algorithm, while improving algorithm based on the OLED life-spans for proposing, the present invention is carried
Go out to realize that the OLED life-spans improve the device of algorithm.
The present invention is further improved：Based on OLED brightness decay models, the brightness decay curve of OLED is corrected, carried
Having gone out the OLED life-spans improves algorithm, and the OLED life-spans improve algorithm suitable for any OLED.
The present invention is further improved：Algorithm is improved based on the OLED life-spans for proposing, the setting life-span improves algorithm
Key parameter, including brightness decay lower limit LxValue, each luminance raising OLED brightness to LyValue, the OLED life-spans improve optimal
Corresponding lifting number of times mbestValue, wherein 0.5L0<Lx<Ly, Lx<Ly<L0。
The present invention is further improved：The key parameter that the OLED life-spans to proposing improve algorithm optimizes place
Reason, determines that the optimal OLED life-spans improve with reference to the hardware driving ability of actual OLED luminescent devices and the display effect of OLED
The parameter of algorithm.
The present invention is further improved：The optimization OLED life-spans improve the parameter L of algorithmxWhen, it is considered to OLED display
The uniformity of part, while the uniformity of the display devices such as LCD, PDP is contrasted, by LxIt is determined that being followed in a rational span
Ring treatment.
The present invention is further improved：The optimization OLED life-spans improve the parameter L of algorithmyWhen, it is thus necessary to determine that OLED is bright
Degree limit of compensation Lmax, it is considered to the hardware driving ability of actual OLED light-emitting display devices, when OLED is with L0Corresponding electricity when lighting
It is I to flow0, and the hardware driving ability maximum of OLED can provide electric current for Imax, ImaxCorresponding brightness is Lmax, wherein Imax≥I0,
Lmax≥L0.The brightness that can be compensated have thus determined OLED maximums is Lmax。
The present invention is further improved：The OLED life-spans improve algorithm it is determined that LmaxAfterwards, a L is often sety(i)When,
According to luminance compensation limit Lmax, it may be determined that the Ly(i)Corresponding maximum compensation number of times mmax.OLED current and original intensity are closed
It is linear, in the OLED life-spans improve algorithm, often lifts original intensity of the brightness equivalent to OLED and occur once
Change, when the original intensity of OLED reaches LmaxShi Wufa proceeds compensation, now can determine that maximum compensation number of times mmax。
The present invention is further improved：The OLED life-spans improve algorithm it is determined that Ly(i)Corresponding maximum compensation number of times
mmaxAfterwards, to combine OLED real materials characteristic to determine the compensable maximum attenuation degree α of OLEDlimit, then by αlimitCome
Determine optimal m, a brightness is often lifted due to OLED, the corresponding driving currents of OLED can also increase, and will certainly accelerate OLED
Trueattenuation degree α, therefore setting αlimitI.e. when the Trueattenuation degree of OLED reaches αlimitShi Wufa continues through increase
The driving current of OLED or the method for voltage lift its brightness, the m for now determining improve algorithm for the OLED life-spans in brightness by Lx
It is promoted to Ly(i)Corresponding optimal compensation number of times, wherein 0≤m≤mmax。
The present invention is further improved：The optimization OLED life-spans improve the parameter L of algorithmyIt is by being incremented by LyMethod
To determine optimal Ly.Therefore by LyIt is step cycle treatment with Δ L, wherein 0≤Δ L≤(L0-Lx).Using described above every
Secondary progressive Ly(i)Corresponding optimal compensation number of times mi, herein i represent i ＆ lt circulation, wherein i=0：(L0-Lx)/ΔL。
The present invention is further improved：Consider hardware data storage and later data treatment and the OLED life-spans change
Kind effect, from Ly(i)Corresponding optimal compensation number of times miIt is middle to choose optimal compensation number of times mbestAnd its corresponding optimal Ly。
The present invention is further improved：The optimization method that the OLED life-spans improve algorithm is entered using the method for double circulation
Row optimization, i.e., to LxAnd LyCarry out double circulation, i.e. LxOften become once, circulate all of Ly(i), find out mbest, then change again
Lx.Finally determine optimal LxAnd LyAnd compensation number of times mbest。
The present invention is further improved：Determine that the OLED life-spans improve parameter Lx, LyAnd optimal mbestAfterwards, OLED brightness
The node of lifting needs not move through external circuit and detects its brightness or voltage to determine every time, but the brightness number for passing through OLED
The node that each OLED lifts brightness is set according to the brightness decay degree α for calculating OLED.
Compared with prior art, the present invention has the following technical effect that：
The present invention utilizes the brightness decay model of OLED, and the brightness decay curve based on OLED is bent to OLED brightness decays
Line is modified, setting OLED brightness decay lower limits Lx, whenever the L of the brightness decay of OLEDxWhen, by the driving for lifting OLED
Electric current or anode voltage are by the luminance raising of OLED to LyPlace, the brightness of such OLED maintains L within a very long timex~
LyBetween, the life-span of OLED had both been extended, in turn ensure that the brightness uniformity of OLED.
The present invention optimizes treatment to the key parameter that the OLED life-spans improve algorithm, with reference to the actual driving energy of OLED
The material property of power, OLED display effects and actual OLED improves the key parameter of algorithm optimizing the OLED life-spans.By OLED
Actual driving force determine the brightness maximum limit of compensation L of OLEDmax, brightness benefit is limited by the display effect of OLED
Repay lower limit LxRange of DO, the compensable maximum Trueattenuation degree α of OLED are limited by the material property of OLEDlimit,
Then L is usedxAnd LyBicirculating method selectes each Ly(i)Corresponding optimal compensation number of times mi.Last synthesis actual number
Optimal compensation number of times m is chosen according to treatment and data storage and OLED lifetime improving effectsbestAnd optimal compensation brightness section (Lx,
Ly)。
Life-span of OLED luminescent devices proposed by the invention improves algorithm, it is determined that the OLED life-spans improve parameter Lx, LyAnd
Optimal mbestAfterwards, the node that OLED brightness is lifted every time needs not move through external circuit and detects its brightness or voltage to determine,
But the brightness decay degree α of OLED calculated by the brightness data of OLED and sets the node that each OLED lifts brightness.
The life-span of OLED luminescent devices improves algorithm and device cost of implementation is low, and the degree of accuracy is high.
The life-span of OLED luminescent devices proposed by the invention improves algorithm and device, is applicable not only to digital circuit, together
When be applied to analog circuit；First embodiment is certain OLED sample to determine original intensity L0And the L for determiningxCarried out with Δ L excellent
Change, determine parameter LyAnd mbestIllustrate, in actual applications original intensity L0Can be arbitrary value, L with Δ LxAnd LyValue
Scope is 0.5L0<Lx<Ly, Lx<Ly<L0, in first embodiment, single OLED samples are carried out a little with original intensity 5000nits
Bright, it is 3750nits to set brightness decay lower limit according to display quality requirement, and incremental 50nits is optimized every time, is finally given
Optimal compensation number of times mbestIt is 5, optimal LyIt is 4150nits, the life-span upgrading of OLED 28.1%.In second embodiment,
The OLED life-spans improve calculation device carries out data processing compensation to multiple OLED samples or each pixel of OLED display in FPGA,
Voltage after compensation or current data are delivered into OLED hardware circuits to be processed.
Brief description of the drawings
Further understand and be incorporated herein constituting a part of accompanying drawing of the application to understand this hair to present invention offer
Bright implementation method, and it is used for principle of the invention together with specification.In the accompanying drawings：
Fig. 1 for the present invention in the OLED life-spans improve algorithm schematic diagram；
Fig. 2 is OLED Trueattenuation degree α in the present inventionactualWith each OLED luminance raisings change schematic diagram
Fig. 3 improves algorithm key parameter Optimizing Flow block diagram for the OLED life-spans of the present invention；
Fig. 4 is first embodiment Lx=0.75L0When each LyCorresponding optimal compensation number of times；
Fig. 5 is first embodiment Lx=0.75L0When each LyCorresponding lifetime improving effect；
Fig. 6 is the apparatus structure schematic diagram that the OLED life-spans improve algorithm
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Reference picture 1, Fig. 1 is the schematic diagram that the OLED life-spans improve algorithm.Solid black lines represent OLED with L in Fig. 10When lighting
Brightness decay curve, index of coincidence attenuation model.Black thick dashed line represents the OLED life-spans in figure improves the amendment brightness of algorithm
Attenuation curve, i.e., when OLED brightness decays to brightness LxBy the luminance raising of OLED to LyPlace, now maintains the brightness of OLED
Lx~LyInterval, the N in Fig. 1 represents the brightness that n-th lifts OLED.The life-span of OLED be defined as OLED brightness drop to it at the beginning of
Time needed for the 50% of beginning brightness, the life-span of OLED life-spans OLED when improving algorithm is provided without as seen from Figure 1 in t3~t4Area
Between, but algorithm is improved by the OLED life-spans, the now brightness of OLED still maintains Lx~LyInterval, the life-span of OLED is obvious
Be improved.The brightness decay curve of OLED has index characteristic as can be known from Fig. 1, further investigations have shown that OLED is bright
Degree attenuation curve can be described with Elongation index attenuation curve, as in equationi.
【Equation 1】
L=L0exp(-(t/τ)β)
In equation 1, L0It is OLED original intensities, t is that OLED shows the time, and τ is the coefficient related to original intensity, β
Material, manufacture craft then with OLED samples etc. are relevant, and L is OLED with original intensity L0Light the real-time luminosity after the t times.
Reference picture 2, Fig. 2 is the attenuation degree curve synoptic diagram of OLED, and black curve represents OLED with original intensity in Fig. 2
L0Attenuation degree when lighting, the dotted line of gradual change represents the OLED life-spans in Fig. 2 improves the attenuation curve that algorithm lifts brightness every time.
It is that the driving current or anode voltage by lifting OLED are realized to lift brightness every time due to OLED, with the electric current of OLED
Increase, the rate of decay of OLED will certainly be accelerated, the OLED attenuation degree curves after the brightness lifted every time from Fig. 2 can also
It is clear to find.OLED attenuation degrees curve can be obtained according to OLED attenuation degree formula, as shown in equation 2,
【Equation 2】
α=exp (- ((t0L0 n+……+tmLm n)/K)β)
In equation 2, m represents the quantity of the time period with different brightness, tmRepresent OLED with LmBrightness drives institute right
The time answered.In equation 2, K and n is constant for the OLED samples for determining.
Meanwhile, when the Trueattenuation degree of OLED is less than 50%, OLED still can improve algorithm by the OLED life-spans
To lift the life-span purpose that its brightness reaches extension OLED.But material property and brightness decay mechanism due to OLED, can not
The extension OLED life-spans unconfined can be reached by lifting brightness, under now there are a different attenuation degrees according to different OLED
Limit αlimit, i.e., when the Trueattenuation degree of OLED reaches αlimitWhen OLED cannot improve algorithm by the OLED life-spans to be lifted
The life-span of OLED, i.e. OLED life-spans improve algorithm and reach limit of compensation.
Propose the OLED life-spans improve algorithm, it is known that mainly have several key parameters it needs to be determined that, the brightness of the compensation of OLED
Lower limit Lx, OLED compensation lifting brightness to Ly, the compensable attenuation degree limit α of OLEDlimit, and the optimal number of times of OLED compensation
mbest。
Reference picture 3, Fig. 3 gives the optimization method block diagram for improving algorithm in the OLED life-spans, mainly includes equal according to display
Even property determines Lx(300) L, is determined according to driving IC driving forcesmax(301), LySelection range be Lx+ Δ L to L0(302),
Determine different LyCorresponding maximum compensation number of times mmax(303) the different L of compensation, are calculatedyLife-span t1/2(304), according to difference
t1/2Obtain true αactualWith correspondence m (305), it is ensured that αactual>αlimitObtain optimal mbestAnd compensation life-span tf(306), obtain
Optimal Ly(307), flow connection is as shown in Figure 3.
Display uniformity determines Lx(300) it is mainly and is led to reference to related according to the show uniformity requirement of actual OLED
Domain display brightness uniformity determines OLED brightness lower limits Lx。
Determine L according to IC driving forces are drivenmax(301) it is mainly the driving force according to actual OLED to determine brightness
Limit of compensation Lmax, the brightness of OLED and electric current be linear, when OLED is with L0Corresponding electric current is I when lighting0, and OLED
Hardware driving ability maximum can provide electric current for Imax, ImaxCorresponding brightness is Lmax, wherein Imax≥I0, Lmax≥L0.It is so true
The brightness that having determined OLED maximums can compensate is Lmax。
LySelection range be Lx+ Δ L to L0(302) this is the key of optimization method, that is, circulate LyValue, should now take
Suitable Δ L is to LyValue be circulated value.
Determine different LyCorresponding maximum compensation number of times mmax(303) effect is whenever (302) send a Ly
Value, in improving algorithm in the OLED life-spans, often lifts original intensity of the brightness equivalent to OLED and one-shot change occurs, such as
Shown in equation 3, corresponding original intensity after i ＆ lt lifting is represented, when the original intensity of OLED reaches LmaxShi Wufa proceeds
Compensation, now can determine maximum compensation number of times m according to equation 4max。
【Equation 3】
L0(i)=L0*(Ly/Lx)i i∈(1,mmax)
In equation 3, LxRepresent OLED compensation brightness lower limit, LyRepresent OLED brightness from LxIt is promoted to Ly, L0Represent OLED
Original intensity, i represent i ＆ lt lifted OLED brightness, L0(i)Represent corresponding initial bright after the lifting brightness of OLED i ＆ lts
Degree.
【Equation 4】
M=log(Ly/Lx)(Lmax/L0), mmax=Int (m)
In equation 4, equation 3 is changed, obtain LyCorresponding maximum m, m wait until m after roundingmax。
Calculate the different L of compensationyLife-span t1/2(304) effect is to calculate each LyIn the corresponding life-span, obtain each
Ly(305) are sent to i.e. according to different t during the corresponding life-span1/2Obtain true αactualWith correspondence m can, according to OLED brightness
Attenuation degree (equation 2) can calculate different LyLife-span corresponding to OLED Trueattenuation degree αactual。
Ensure αactual>αlimitObtain optimal mbestAnd compensation life-span tf(306) effect is special by actual OLED material
Property can compensate for attenuation degree limit αlimitRestriction, from each LyCorresponding m and in the life-span choosing remove optimal mbest, while
Its corresponding compensation life-span t is arrivedf；Also determine OLED compensation to brightness L by (307)y, so determined by the optimization method
The OLED life-spans improve the optimized parameter of algorithm.
Determine that the OLED life-spans improve parameter Lx, LyAnd optimal mbestAfterwards, OLED brightness every time lifting node and need not lead to
Cross external circuit to detect its brightness or voltage to determine, but the brightness decay degree of OLED is calculated by the brightness data of OLED
α sets the node that each OLED lifts brightness, as shown in eq 5.
【Equation 5】
αi=Lx i/(L0*Ly (i-1))i∈(1,mbest)
In equation 5, LxRepresent OLED compensation brightness lower limit, LyRepresent OLED brightness from LxIt is promoted to Ly, L0Represent OLED
Original intensity, i represent i ＆ lt lifted OLED brightness, αiRepresent the OLED Trueattenuation journeys during lifting brightness of OLED i ＆ lts
Degree node.
As long as therefore calculating the Trueattenuation degree of OLED in real time by equation 2, during then in conjunction with OLED lifting brightness
OLED Trueattenuation degree nodes come judge OLED whether need lifted brightness.
First embodiment：
Improving algorithm and OLED life-spans based on above-mentioned the proposed OLED life-spans improves the optimization method of algorithm, with certain company
The OLED samples of offer carry out the implementation of the above method.OLED is lighted by original intensity of 5000nits in embodiment,
Attenuation degree difference causes uniformity different when considering that image different pixels point shows different brightness, the uniformity of LCD display
More than 75%, therefore need to consider that the uniformity for making display, more than 75%, determines OLED when OLED life-spans backoff algorithm optimizes
Brightness lower limit LxIt is 75%L0As 3750nits；For the driving force of actual OLED, maximum current correspondence OLED brightness can
Up to 15000nits, it is thus determined that luminance compensation limit LmaxIt is 15000nits；For LyThe treatment of circulation, implementation process is adopted
It is 1%L with Δ L0That is 50nits circulates LyValue, i.e. Ly(i)=Lx+ i* Δs L is circulated value, and wherein i represents i ＆ lt and follows
Ring；Then optimization method flow (303)~(305) for improving algorithm according to the OLED life-spans can obtain each LyCorresponding compensation
Number of times m；Can obtain the OLED life-spans then according to optimization method flow (306)~(307) improves the Optimal Parameters L of algorithmyAnd
mbest。
Reference picture 4, Fig. 4 improves the different L that algorithm optimization method is obtained for embodiment by the OLED life-spansyCorresponding compensation
The relation curve of number of times m, LyRange of DO be 75%L0~L0, stepping Δ L is 1%L0.As can be known from Fig. 4, L is worked asyIt is 76%
L0When compensation number of times m up to 38 times, with LyContinuous increase, the compensation number of times m of corresponding OLED is gradually reduced, and works as LyFor
L0When compensation number of times m be only 1 time.
Reference picture 5, Fig. 5 is difference L in embodimentyCorresponding lifetime improving effect, life effect from 32%~
L is understood in 13%, Fig. 5yCorresponding OLED lifes effect is best when minimum.Work as L as can be seen from Figure 5y<0.78L0When, compensation time
Number m is more than 10 times, and L is worked as with reference to Fig. 5y=0.76L0Time delay long-life percent maximum can reach 31%, and work as Ly=0.83L0
The long-life percentage of time delay is 28%, compared to Ly=0.76L0When need compensation 38 times extension life-span percentages reach 31%,
αmaxBeing compensated when=0.83 5 times can extend life-span percentage 28.1%, compensate the more difficulty that can increase algorithm of number of times, and number
According to the various for the treatment of, when compensation number of times and extension life-span effect is considered, can obtain the OLED life-spans improves algorithm most
Excellent parameter is Lx=75%L0=3750nits, Ly=83%L0=4150nits, optimal compensation number of times mbest=5, life
Effect percentage is 28.1%.
Second embodiment：
Reference picture 6, Fig. 6 be improves algorithm in the OLED life-spans realize device block diagram, comprising calculating offset data module 601,
Brightness data module 602 is calculated, storage brightness data module 603 calculates attenuation degree module 604, stores attenuation degree module
605 and detection judge module 606.
Wherein calculate the major function of offset data module 601 be by detect N and α values that judge module 606 brings come
Now gray scale and the corresponding relation of brightness and brightness and voltage or the relation of electric current are calculated, brightness data is then delivered into calculating
Brightness data module 602, OLED drive modules 607 are delivered to by voltage or current data；It is to count to calculate brightness data module 602
The brightness data that calculation offset data module 601 is sent carries out accumulation calculating；Storage brightness data module 603 is will to calculate brightness number
The brightness cumulative data calculated according to module 602 is stored and called；It is that will calculate brightness data module to calculate attenuation degree module 604
The brightness cumulative data of 602 storages calls the attenuation degree α for calculate in real time OLED；Storage attenuation degree module 605 is to count
The OLED attenuation degrees α that calculation attenuation degree module 604 is calculated carries out real-time storage；Detection judge module 606 is by adjusting
Carry out judging that the OLED is compensated in n-th with the OLED attenuation degree α data of the storage of storage attenuation degree module 605, then
N and α values are delivered into calculating offset data module 601 to judge now gray scale and the corresponding relation of brightness and brightness and voltage or electricity
The relation of stream.
Claims (6)
1. a kind of OLED life-spans improve algorithm, it is characterised in that：OLED is with certain original intensity L0When lighting, whenever OLED brightness declines
Reduce to LxWhen, by lifting the driving current of OLED or the method for anode voltage by OLED luminance raisings to Ly, such OLED's is bright
Degree maintains Lx~LyBetween, with reference to OLED actual hardwares driving force and the compensable maximum attenuation degree α of OLEDlimitCome excellent
The change OLED life-spans improve the parameters in algorithm, finally give the optimal parameter L of OLEDx, LyWith compensation number of times mbest, so that
Reach OLED lifetime improving effects.
2. a kind of OLED life-spans according to claim 1 improve algorithm, it is characterised in that：Obtain optimal parameter LxMethod：
The minimum acceptable degree of uniformity and brightness shown with reference to OLED determines OLED brightness decay lower limits Lx, wherein 0.5L0<Lx<
L0, i.e., when OLED is with original intensity L0Light, when brightness decay to LxWhen by lift the driving voltage or driving current of OLED come
Lifting OLED brightness.
3. a kind of OLED life-spans according to claim 1 improve algorithm, it is characterised in that：Obtain LyWith compensation number of times mbest
Method it is as follows：
1) luminance compensation limit L is determined with reference to OLED hardware driving abilitiesmax, when OLED is with L0Corresponding electric current is I when lighting0,
And the hardware driving ability maximum of OLED can provide electric current for Imax, ImaxCorresponding brightness is Lmax, wherein Imax≥I0, Lmax≥
L0, the brightness that can be compensated have thus determined OLED maximums is Lmax；
2) the luminance compensation limit L determined according to hardware driving abilitymax, it may be determined that maximum compensation number of times mmax, OLED current
It is linear with original intensity, in the OLED life-spans improve algorithm, often lift an original intensity of the brightness equivalent to OLED
Generation one-shot change, when the original intensity of OLED reaches LmaxShi Wufa proceeds compensation, now can determine that maximum compensation number of times
mmax, determine the maximum compensation number of times m of OLEDmaxAfterwards, the compensable maximum attenuation degree α of OLED to be combinedlimitIt is optimal to determine
Compensation number of times m, wherein 0≤m≤mmax；
3) m according to determined by 2)maxWith the L that optimal m is a certain determinationyCorresponding value, now needs to be incremented by LyValue carry out
Optimization processing, by LyIt is step cycle treatment with Δ L, wherein 0≤Δ L≤(L0-Lx), determine to pass every time by optimization method
The Ly for entering(i)Corresponding optimal compensation number of times mi, herein i represent i ＆ lt circulation, wherein i=0：(L0-Lx)/ΔL；
4) later data treatment complexity, hardware data storage capacity and OLED lifetime improving effects are considered, from 3)
MiIt is middle to choose optimal compensation number of times mbestAnd its corresponding optimal brightness Ly。
4. a kind of OLED life-spans according to claim 1 improve algorithm, it is characterised in that：By lower limit brightness LxAnd LyTwo
Variable is circulated to determine optimal compensation parameter m simultaneouslybest, optimized parameter Lx, and Ly.After determining OLED compensation algorithm parameter,
The node that OLED brightness is lifted every time needs not move through external circuit and detects its brightness or voltage to determine, but by OLED
Brightness data the brightness decay degree α of OLED is calculated to set the node that each OLED lifts brightness.
5. a kind of OLED life-spans improve the device of algorithm, comprising calculate offset data module (601), calculate brightness data module
(602), storage brightness data module (603), calculates attenuation degree module (604), storage attenuation degree module (605) and detection
Judge module (606), it is characterised in that：Offset data module (601) is calculated to be brought by detecting judge module (606)
N and α values calculate the corresponding relation of now gray scale and brightness, brightness and voltage or the relation of electric current, then by brightness data
Calculating brightness data module (602) is delivered to, voltage or current data is delivered into drive module (607) and is driven；Calculate brightness
Data module (602) is will to calculate brightness data and storage brightness data module (603) tune that offset data module (601) is sent
With brightness data carry out accumulation calculating and by the brightness summation after calculating deliver to storage brightness data module (603)；Storage is bright
Degrees of data module (603) is that the brightness cumulative data that will calculate brightness data module (602) calculating is stored and called；Calculate decay
Degree module (604) is that the brightness cumulative data that will store brightness data module (603) storage calls to calculate OLED's in real time
Attenuation degree α simultaneously gives storage attenuation degree module (605)；Storage attenuation degree module (605) is will to calculate attenuation degree mould
The OLED attenuation degrees α that block (604) is calculated carries out real-time storage and gives detection judge module (606)；Detection judges mould
Block (606) is by the OLED attenuation degree α data for calling storage attenuation degree module (605) to store judge at the OLED
In n-th compensation, N and α values then are delivered into calculating offset data module (601) to judge now gray scale pass corresponding with brightness
System and brightness and voltage or the relation of electric current.
6. the OLED life-spans according to claim 5 improve the device of algorithm, it is characterised in that：Calculate offset data module
(601) comprising gray scale after each luminance raisings of OLED and brightness corresponding relation, brightness and OLED driving current corresponding relations, so
Can be by detecting that the N values that judge module (606) is brought calculate the corresponding brightness of each gradation datas of now OLED and magnitude of voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710121700.XA CN106847176B (en) | 2017-03-02 | 2017-03-02 | A kind of OLED service life improves algorithm and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710121700.XA CN106847176B (en) | 2017-03-02 | 2017-03-02 | A kind of OLED service life improves algorithm and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106847176A true CN106847176A (en) | 2017-06-13 |
| CN106847176B CN106847176B (en) | 2019-05-03 |
Family
ID=59138516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710121700.XA Expired - Fee Related CN106847176B (en) | 2017-03-02 | 2017-03-02 | A kind of OLED service life improves algorithm and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106847176B (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107068061A (en) * | 2017-06-16 | 2017-08-18 | 深圳市华星光电技术有限公司 | The driving method and device of AMOLED panel |
| CN107610060A (en) * | 2017-08-29 | 2018-01-19 | 西安交通大学 | A kind of OLED image calcination ameliorative way and device |
| CN107808632A (en) * | 2017-11-13 | 2018-03-16 | 深圳市华星光电半导体显示技术有限公司 | The compensation method of OLED life time decays and the driving method of OLED display |
| CN109767713A (en) * | 2019-01-09 | 2019-05-17 | 昆山国显光电有限公司 | Display screen, display panel drive method and display device |
| CN110310595A (en) * | 2018-03-27 | 2019-10-08 | 上海和辉光电有限公司 | A kind of the service life backoff algorithm and device of organic electroluminescent device OLED |
| CN110677958A (en) * | 2019-09-11 | 2020-01-10 | 上海绿浦环保科技有限公司 | Light attenuation compensation method based on knowledge base |
| CN110706637A (en) * | 2019-10-28 | 2020-01-17 | 昆山国显光电有限公司 | Display panel brightness compensation method, compensation device and display device |
| CN110710195A (en) * | 2017-06-23 | 2020-01-17 | 华为技术有限公司 | Image display apparatus and control method thereof |
| CN110866347A (en) * | 2019-11-28 | 2020-03-06 | 昆山国显光电有限公司 | Method and apparatus for estimating lifetime of display device, and storage medium |
| CN110930946A (en) * | 2019-11-19 | 2020-03-27 | 深圳市华星光电半导体显示技术有限公司 | OLED driving system and OLED brightness compensation method |
| CN111312180A (en) * | 2020-03-19 | 2020-06-19 | 亚世光电股份有限公司 | PWM compensation method and device for ultra-long service life LED backlight source controlled by MCU |
| WO2020133739A1 (en) * | 2018-12-26 | 2020-07-02 | 武汉华星光电半导体显示技术有限公司 | Display device and compensation method for display device |
| WO2020140254A1 (en) * | 2019-01-04 | 2020-07-09 | 深圳市柔宇科技有限公司 | Brightness compensation method, foldable display device and storage medium |
| CN111445844A (en) * | 2019-01-17 | 2020-07-24 | 奇景光电股份有限公司 | Cumulative brightness compensation system and organic light emitting diode display |
| CN111883058A (en) * | 2020-08-17 | 2020-11-03 | 武汉天马微电子有限公司 | Display panel brightness compensation method and device and display device |
| CN112858861A (en) * | 2021-01-04 | 2021-05-28 | 昆山国显光电有限公司 | Method and system for predicting service life of OLED device |
| US11250769B2 (en) | 2020-03-31 | 2022-02-15 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Compensation system and compensation method for life attenuation of OLED device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111261105A (en) * | 2020-03-31 | 2020-06-09 | 深圳市华星光电半导体显示技术有限公司 | Service life attenuation compensation system and compensation method of OLED device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1571011A (en) * | 2003-11-21 | 2005-01-26 | 友达光电股份有限公司 | Method for displaying image on optical display device with discrepancy brightness attenuation pixel |
| CN103198790A (en) * | 2013-03-15 | 2013-07-10 | 向运明 | Self-illumination display device and method for revising inconsistence of luminance of display units |
| CN104021759A (en) * | 2014-05-30 | 2014-09-03 | 京东方科技集团股份有限公司 | Luminance supplementing method and device for display device, and display device |
| CN104252846A (en) * | 2014-10-11 | 2014-12-31 | 成都晶砂科技有限公司 | Self-checking driving method of OLED (organic light emitting diode) display |
-
2017
- 2017-03-02 CN CN201710121700.XA patent/CN106847176B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1571011A (en) * | 2003-11-21 | 2005-01-26 | 友达光电股份有限公司 | Method for displaying image on optical display device with discrepancy brightness attenuation pixel |
| CN103198790A (en) * | 2013-03-15 | 2013-07-10 | 向运明 | Self-illumination display device and method for revising inconsistence of luminance of display units |
| CN104021759A (en) * | 2014-05-30 | 2014-09-03 | 京东方科技集团股份有限公司 | Luminance supplementing method and device for display device, and display device |
| CN104252846A (en) * | 2014-10-11 | 2014-12-31 | 成都晶砂科技有限公司 | Self-checking driving method of OLED (organic light emitting diode) display |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107068061B (en) * | 2017-06-16 | 2019-12-24 | 深圳市华星光电半导体显示技术有限公司 | Driving method and device of AMOLED panel |
| CN107068061A (en) * | 2017-06-16 | 2017-08-18 | 深圳市华星光电技术有限公司 | The driving method and device of AMOLED panel |
| US10909928B2 (en) | 2017-06-23 | 2021-02-02 | Huawei Technologies Co., Ltd. | Image display apparatus and control method thereof |
| CN110710195A (en) * | 2017-06-23 | 2020-01-17 | 华为技术有限公司 | Image display apparatus and control method thereof |
| CN107610060B (en) * | 2017-08-29 | 2020-03-17 | 西安交通大学 | OLED image burning improvement method and device |
| CN107610060A (en) * | 2017-08-29 | 2018-01-19 | 西安交通大学 | A kind of OLED image calcination ameliorative way and device |
| CN107808632A (en) * | 2017-11-13 | 2018-03-16 | 深圳市华星光电半导体显示技术有限公司 | The compensation method of OLED life time decays and the driving method of OLED display |
| CN110310595A (en) * | 2018-03-27 | 2019-10-08 | 上海和辉光电有限公司 | A kind of the service life backoff algorithm and device of organic electroluminescent device OLED |
| WO2020133739A1 (en) * | 2018-12-26 | 2020-07-02 | 武汉华星光电半导体显示技术有限公司 | Display device and compensation method for display device |
| WO2020140254A1 (en) * | 2019-01-04 | 2020-07-09 | 深圳市柔宇科技有限公司 | Brightness compensation method, foldable display device and storage medium |
| CN109767713A (en) * | 2019-01-09 | 2019-05-17 | 昆山国显光电有限公司 | Display screen, display panel drive method and display device |
| CN111445844A (en) * | 2019-01-17 | 2020-07-24 | 奇景光电股份有限公司 | Cumulative brightness compensation system and organic light emitting diode display |
| CN110677958A (en) * | 2019-09-11 | 2020-01-10 | 上海绿浦环保科技有限公司 | Light attenuation compensation method based on knowledge base |
| CN110706637A (en) * | 2019-10-28 | 2020-01-17 | 昆山国显光电有限公司 | Display panel brightness compensation method, compensation device and display device |
| CN110706637B (en) * | 2019-10-28 | 2022-10-25 | 昆山国显光电有限公司 | Display panel brightness compensation method, compensation device and display device |
| CN110930946A (en) * | 2019-11-19 | 2020-03-27 | 深圳市华星光电半导体显示技术有限公司 | OLED driving system and OLED brightness compensation method |
| CN110866347A (en) * | 2019-11-28 | 2020-03-06 | 昆山国显光电有限公司 | Method and apparatus for estimating lifetime of display device, and storage medium |
| CN111312180A (en) * | 2020-03-19 | 2020-06-19 | 亚世光电股份有限公司 | PWM compensation method and device for ultra-long service life LED backlight source controlled by MCU |
| US11250769B2 (en) | 2020-03-31 | 2022-02-15 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Compensation system and compensation method for life attenuation of OLED device |
| CN111883058A (en) * | 2020-08-17 | 2020-11-03 | 武汉天马微电子有限公司 | Display panel brightness compensation method and device and display device |
| CN112858861A (en) * | 2021-01-04 | 2021-05-28 | 昆山国显光电有限公司 | Method and system for predicting service life of OLED device |
| CN112858861B (en) * | 2021-01-04 | 2023-10-27 | 昆山国显光电有限公司 | Method and system for predicting service life of OLED device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106847176B (en) | 2019-05-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106847176A (en) | A kind of OLED life-spans improve algorithm and device | |
| US6836264B2 (en) | Driving circuit of display | |
| JP3995504B2 (en) | Organic EL display device | |
| CN105070248B (en) | Improve the OLED drive systems and driving method of picture contrast | |
| CN104347031B (en) | Display device, the method for driving the display device and electronic equipment | |
| US8624804B2 (en) | Method of driving organic light emitting diode display device in an interlaced scanning mode in which a single frame is divided | |
| CN1921670A (en) | Apparatus and method for displaying a mobile terminal standby screen | |
| CN101075410A (en) | Image display system and method for driving display assembly | |
| CN1949340A (en) | Organic electro luminescent display and driving method of the same | |
| CN109192175B (en) | Driving method and driving device of display panel and display device | |
| CN106409230A (en) | Pixel unit compensation method | |
| CN111554238A (en) | Brightness compensation method for organic light emitting diode display panel | |
| US7295192B2 (en) | Compensating color shift of electro-luminescent displays | |
| CN106920516A (en) | Compensation method and device for OLED, display device | |
| US20210110775A1 (en) | Pixel driving system for amoled display device and driving method | |
| CN110136631B (en) | Method for adjusting display picture of display device | |
| CN105632406B (en) | Display device and its image control method | |
| CN1804979A (en) | Active matrix organic LED display and its driving method | |
| CN106531078A (en) | Compensation method of pixel unit | |
| US20140240366A1 (en) | Display device for reducing dynamic false contour | |
| KR101560238B1 (en) | Organic light emitting diode display device and method for driving the same | |
| CN115641814A (en) | Display device and driving method thereof | |
| KR20130012762A (en) | Organic light emitting display device and driving method thereof | |
| US20070008254A1 (en) | Driving circuit using pulse width modulation technique for a light emitting device | |
| CN1261918C (en) | Driving circuit for display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190503 |