CN107767815A - The compensation system and method for OLED display panel - Google Patents
The compensation system and method for OLED display panel Download PDFInfo
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- CN107767815A CN107767815A CN201711242835.8A CN201711242835A CN107767815A CN 107767815 A CN107767815 A CN 107767815A CN 201711242835 A CN201711242835 A CN 201711242835A CN 107767815 A CN107767815 A CN 107767815A
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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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Abstract
The present invention provides a kind of compensation system and method for OLED display panel.The system includes：GTG input module, weighting modulation module, compensation calculation module, D/A converter module, OLED subpixel and current monitoring module；The compensation calculation module can input initial GTG and the index of modulation and maximum feedback electric current that measure in advance according to GTG input module, be calculated to should initial GTG object feedback electric current, and the actual feedback currents of the OLED subpixel arrived according to the object feedback electric current and current monitoring module monitors, weight coefficient is calculated, the weighting modulation module can adjust initial GTG according to the weight coefficient and draw target gray scale, the OLED subpixel is lighted using the target gray scale, it can compensate for showing non-uniform phenomenon as caused by Organic Light Emitting Diode aging in itself, reduce the memory space needed for compensation system, lift the picture uniformity of display panel.
Description
Technical field
The present invention relates to the compensation system and method for display technology field, more particularly to a kind of OLED display panel.
Background technology
Organic Light Emitting Diode (Organic Light Emitting Display, OLED) display device has spontaneous
Light, driving voltage are low, luminous efficiency is high, the response time is short, definition and contrast are high, nearly 180 ° of visual angles, use temperature ranges
Width, many advantages, such as Flexible Displays are with large area total colouring can be achieved, it is the display for most having development potentiality to be known as by industry
Device.
OLED display according to type of drive can be divided into passive matrix OLED (Passive Matrix OLED,
) and active array type OLED (Active Matrix OLED, AMOLED) two major classes, i.e. direct addressin and film crystal PMOLED
Manage the class of (Thin Film Transistor, TFT) matrix addressing two.Wherein, AMOLED has the pixel in array arrangement, category
In active display type, luminous efficacy is high, is typically used as the large scale display device of fine definition.
AMOLED is current driving apparatus, when there is electric current to flow through Organic Light Emitting Diode, organic light-emitting diode,
And luminosity is determined by the electric current for flowing through Organic Light Emitting Diode itself.Most of existing integrated circuit (Integrated
Circuit, IC) voltage signal is all only transmitted, therefore AMOLED pixel-driving circuit needs to complete voltage signal being changed into electricity
Flow the task of signal.Usual AMOLED pixel-driving circuits are equipped with the driving film for driving organic light-emitting diode
Transistor, in use, because the aging of organic light emitting diode and the threshold voltage of driving thin film transistor (TFT) are inclined
Move, the display quality of OLED display can be caused to decline, it is therefore desirable to detect and drive during the use of OLED display
The threshold voltage of dynamic thin film transistor (TFT) compensates to it, so as to ensure the display quality of OLED display.
Although some compensation techniques solve Vth influence, cost is that complicated compensation circuit subtracts pixel aperture ratio
It is small, the pixel quantity of display panel per inch is also had certain limitations, it is poor that evaporation processing procedure causes characteristic to be present between each sub-pixel
Different, such as the cross-pressure between OLED and luminous efficiency difference, existing solution method is can to make panel just using external optical compensation
Often display, but external optical compensation needs to use the memory of costliness, and as screen size increases, storage space size
It is multiplied, so as to greatly increase cost；And can not still solve the influence that OLED aging is brought.
The content of the invention
It is an object of the invention to provide a kind of compensation system of OLED display panel, can compensate for by organic light-emitting diodes
Non-uniform phenomenon is shown caused by the aging of pipe itself, reduces the memory space needed for compensation system, lifts the picture of display panel
Surface uniformity.
The present invention also aims to provide a kind of compensation method of OLED display panel, can compensate for by organic light emission two
Non-uniform phenomenon is shown caused by the aging of pole pipe in itself, the memory space needed for compensation system is reduced, lifts display panel
Picture uniformity.
To achieve the above object, the invention provides a kind of compensation system of OLED display panel, including：GTG inputs mould
Block, the weighting modulation module being connected with the GTG input module, with the GTG input module and weighting modulation module it is homogeneous
Compensation calculation module even, with described weight D/A converter module that modulation module is connected, be connected with the D/A converter module
OLED subpixel and the current monitoring module that is connected with the OLED subpixel and compensation calculation module；
The GTG input module, for providing initial GTG to the weighting modulation module and compensation calculation module；
The current monitoring module, for monitoring the actual feedback currents of the OLED subpixel, and the reality is anti-
Feed is streaming to compensation calculation module；
The compensation calculation module, for according to the initial GTG and the index of modulation and the maximum feedback electricity measured in advance
Stream, be calculated to should initial GTG object feedback electric current, and according to the object feedback electric current and actual feedback currents,
Weight coefficient is calculated；
The weighting modulation module, for being adjusted according to the weight coefficient to the initial GTG, draw target
GTG；
The D/A converter module, for the target gray scale to be converted into data voltage, and input the OLED picture
Element, luminance compensation is carried out to the OLED subpixel.
The compensation system of the OLED display panel also includes：The memory module being connected with the compensation calculation module, institute
State memory module internal memory and contain an index of modulation look-up table and a maximum feedback current look-up table, in the index of modulation look-up table
The index of modulation provided with OLED subpixel all in the OLED display panel, it is provided with the maximum feedback current look-up table
The maximum feedback electric current of all OLED subpixels in the OLED display panel；
The compensation calculation module is additionally operable to from the index of modulation look-up table and the maximum feedback current look-up table
The maximum for searching the index of modulation for the OLED subpixel currently to be compensated and the OLED subpixel currently to be compensated respectively is anti-
Supply current.
Wherein, the formula for obtaining the index of modulation of each OLED subpixel is：
Wherein, KiFor the index of modulation of i-th of OLED subpixel (60), LmaxiExist for i-th of OLED subpixel (60)
Brightness under the maximum gray of OLED display panel, Lmax0Own for the OLED display panel when inputting maximum gray
The brightness of a minimum OLED subpixel (60) of brightness in OLED subpixel (60), γ are the gamma of the OLED display panel
Index.
The maximum feedback electric current of each OLED subpixel is：By OLED pictures all in the OLED display panel
Element is adjusted to Lmax0When, measure the obtained feedback current of each OLED subpixel.
The object feedback electric current is calculated according to following equation in the compensation calculation module：
Wherein, grayiThe initial GTG of i-th of the OLED subpixel currently provided for GTG input module, IgrayiFor
I OLED subpixel to should initial GTG object feedback electric current, ImaxiFor the maximum feedback electricity of i-th of OLED subpixel
Stream.
The weight coefficient is calculated according to following equation in the compensation calculation module：
Wherein, σiFor the weight coefficient of i-th of OLED subpixel, IfbiI-th of electric current is measured for the current monitoring module
The actual feedback currents of monitoring modular.
The weighting modulation module draws target gray scale according to the following equation adjustment initial GTG：
grayi'=grayi·σi
Wherein, grayi' for the target gray scale of i-th OLED subpixel.
The compensation system of the OLED display panel also includes：Calibration module, the calibration module input with the GTG
Module, memory module and current monitoring module are connected, and the initial GTG for being provided in the GTG input module is equal to maximum
During GTG, the actual feedback currents of the OLED subpixel and the maximum feedback electric current measured in advance, and in the OLED
When the actual feedback currents of sub-pixel are less than the maximum feedback electric current measured in advance, an electric current zoom factor is generated, by described
Electric current zoom factor adjusts the maximum feedback electric current of each OLED subpixel.
The OLED subpixel includes：First film transistor, the second thin film transistor (TFT), the 3rd thin film transistor (TFT), the 4th
Thin film transistor (TFT), electric capacity and Organic Light Emitting Diode；
The grid access scanning signal of the first film transistor, source electrode access data voltage, drain electrode are electrically connected with the
One node；The grid of second thin film transistor (TFT) is electrically connected with first node, source electrode access power supply high voltage, and drain electrode electrically connects
Connect section point；The grid access scanning signal of 3rd thin film transistor (TFT), source electrode are electrically connected with section point, and drain electrode is electrical
Connect current monitoring module；
The grid access LED control signal of 4th thin film transistor (TFT), source electrode are electrically connected with section point, drain electrode electricity
Property connection Organic Light Emitting Diode anode；
The first end of the electric capacity is electrically connected with first node, and the second end is electrically connected with the source electrode of the second thin film transistor (TFT)；
The negative electrode access power supply low-voltage of the Organic Light Emitting Diode.
The present invention also provides a kind of compensation method of OLED display panel, the compensation applied to above-mentioned OELD display panels
Device, comprise the following steps：
Step S1, GTG input module provides initial GTG to the weighting modulation module and compensation calculation module；
Step S2, the actual feedback currents of OLED subpixel described in current monitoring module monitors, and by the actual feedback
Electric current is transferred to compensation calculation module；
Step S3, compensation calculation module is according to the initial GTG and the index of modulation and the maximum feedback electricity measured in advance
Stream, be calculated to should initial GTG object feedback electric current, and according to the object feedback electric current and actual feedback currents,
Weight coefficient is calculated；
Step S4, weight modulation module to be adjusted the initial GTG according to the weight coefficient, draw target ash
Rank；
Step S5, the target gray scale is converted to data voltage by D/A converter module, and inputs the OLED subpixel,
Luminance compensation is carried out to the OLED subpixel.
Beneficial effects of the present invention：The present invention provides a kind of compensation system of OLED display panel, including：GTG inputs mould
Block, the weighting modulation module being connected with the GTG input module, with the GTG input module and weighting modulation module it is homogeneous
Compensation calculation module even, with described weight D/A converter module that modulation module is connected, be connected with the D/A converter module
OLED subpixel and the current monitoring module that is connected with the OLED subpixel and compensation calculation module；The compensation calculation
Module can input initial GTG and the index of modulation and maximum feedback electric current that measure in advance according to GTG input module, calculate
To should initial GTG object feedback electric current, and arrived according to the object feedback electric current and current monitoring module monitors
The actual feedback currents of OLED subpixel, are calculated weight coefficient, and the weighting modulation module can be according to the weighting
Number adjusts initial GTG and draws target gray scale, lights the OLED subpixel using the target gray scale, can compensate for by organic
Non-uniform phenomenon is shown caused by the aging of light emitting diode in itself, reduces the memory space needed for compensation system, lifting display
The picture uniformity of panel.The present invention also provides a kind of compensation method of OLED display panel, can compensate for by organic light emission two
Non-uniform phenomenon is shown caused by the aging of pole pipe in itself, the memory space needed for compensation system is reduced, lifts display panel
Picture uniformity.
Brief description of the drawings
In order to be further understood that the feature of the present invention and technology contents, refer to below in connection with the detailed of the present invention
Illustrate and accompanying drawing, however accompanying drawing only provide with reference to and explanation use, be not used for being any limitation as the present invention.
In accompanying drawing,
Fig. 1 is the schematic diagram of the compensation system of the OLED display panel of the present invention；
Fig. 2 be the present invention OLED display panel compensation system in OLED subpixel circuit diagram；
Fig. 3 be the present invention OLED display panel compensation system in OLED subpixel working timing figure；
Fig. 4 is the flow chart of the compensation method of the OLED display panel of the present invention.
Embodiment
Further to illustrate the technological means and its effect of the invention taken, below in conjunction with being preferable to carry out for the present invention
Example and its accompanying drawing are described in detail.
Referring to Fig. 1, the present invention provides a kind of compensation system of OLED display panel, including：GTG input module 10, with
The connected weighting modulation module 20 of the GTG input module 10, with the GTG input module 10 and to weight modulation module 20 equal
Connected compensation calculation module 30, the D/A converter module 50 being connected with the weighting modulation module 20 and the digital-to-analogue conversion
The connected OLED subpixel 60 of module 50 and the current monitoring being connected with the OLED subpixel 60 and compensation calculation module 30
Module 70；
The GTG input module 10, for providing initial ash to the weighting modulation module 20 and compensation calculation module 30
Rank；
The current monitoring module 70, for monitoring the actual feedback currents of the OLED subpixel 60, and by the reality
Border feedback current is transferred to compensation calculation module 30；
The compensation calculation module 30, for according to the initial GTG and the index of modulation and maximum feedback that measure in advance
Electric current, be calculated to should initial GTG object feedback electric current, and according to the object feedback electric current and actual feedback electricity
Stream, is calculated weight coefficient；
The weighting modulation module 20, for being adjusted according to the weight coefficient to the initial GTG, draw mesh
Mark GTG；
The D/A converter module 50, for the target gray scale to be converted into data voltage, and input OLED
Pixel 60, luminance compensation is carried out to the OLED subpixel 60.
When it is implemented, an OLED display panel includes multiple OLED subpixels 60 of array arrangement, for difference
OLED subpixel 60, its index of modulation measured in advance and maximum feedback electric current are also not necessarily identical, therefore, in order to OLED
Each OLED subpixel 60 in display panel realizes correct compensation, and the compensation system of OLED display panel of the invention is also
Including：The memory module 40 being connected with the compensation calculation module 30, the internal memory of memory module 40 contain an index of modulation and looked into
Table and a maximum feedback current look-up table are looked for, is provided with the index of modulation look-up table all in the OLED display panel
The index of modulation of OLED subpixel 60, it is provided with the maximum feedback current look-up table all in the OLED display panel
The maximum feedback electric current of OLED subpixel 60, such as shown in Tables 1 and 2, Tables 1 and 2 be respectively an index of modulation look-up table and
One maximum feedback current look-up table.
The index of modulation look-up table of table 1
| 1 | 2 | …… | M-1 | M | |
| 1 | k(1,1) | k(1,2) | …… | k(1,M-1) | k(1,M) |
| 2 | k(2,1) | k(2,2) | …… | k(2,M-1) | k(2,M) |
| …… | …… | …… | …… | …… | …… |
| N-1 | k(N-1,1) | k(N-1,2) | …… | k(N-1,M-1) | k(N-1,M) |
| N | k(N,1) | k(N,2) | …… | k(N,M-1) | k(N,M) |
The maximum feedback current look-up table of table 2
| 1 | 2 | …… | M-1 | M | |
| 1 | Imax(1,1) | Imax(1,2) | …… | Imax(1,M-1) | Imax(1,M) |
| 2 | Imax(2,1) | Imax(2,2) | …… | Imax(2,M-1) | Imax(2,M) |
| …… | …… | …… | …… | …… | …… |
| N-1 | Imax(N-1,1) | Imax(N-1,2) | …… | Imax(N-1,M-1) | Imax(N-1,M) |
| N | Imax(N,1) | Imax(N,2) | …… | Imax(N,M-1) | Imax(N,M) |
In the Tables 1 and 2, abscissa represents the line number where each OLED subpixel, and ordinate represents respectively
Columns where individual OLED subpixel, during specific works, the compensation calculation module 30 also needs to search from the index of modulation
In table and the maximum feedback current look-up table respectively search the OLED subpixel 60 currently to be compensated the index of modulation and
The maximum feedback electric current of the current OLED subpixel 60 to be compensated, for example, the current OLED subpixel 60 to be compensated is the 2nd row the
The OLED subpixel 60 of 2 row, then it was found from Tables 1 and 2 lookup, the index of modulation corresponding to the OLED subpixel 60 of the 2nd row the 2nd row
It is respectively k (2,2) and Imax (2,2) with maximum feedback electric current.
When it is implemented, for the OLED display panel that a luma data width is 8bit, its maximum gray is
255, it is as follows that it measures the process of the index of modulation and maximum feedback electric current：First, first inputted to the OLED display panel
255 GTGs, and the brightness of each OLED subpixel 60 in the OLED display panel is measured by brightness measuring device for camera, obtain bright
Degree distribution, the brightness of the OLED subpixel 60 that brightness is minimum in all OLED subpixels 60 is chosen as Benchmark brightness,
The brightness of other sub-pixels is adjusted to the Benchmark brightness so that the brightness uniformity of OLED display panel, specific method of adjustment
It is as follows：
Wherein, gray_255i' for adjustment after i-th of sub-pixel GTG, Lmax0On the basis of brightness, LmaxiFor i-th
Brightness of the OLED subpixel 60 under 255 GTGs of OLED display panel, γ are the gamma index of the OLED display panel,
The GTG of i-th of OLED subpixel is adjusted to gray_255i' cause the brightness of i-th of sub-pixel to be equal to Benchmark brightness, have
When body is implemented, an OLED subpixel of which row of i-th of OLED subpixel and which row is equal, and i represents OLED
The ranks number of pixel.
Meanwhile the index of modulation of each OLED subpixel 60 is calculated, calculation formula is：
Wherein, KiFor the index of modulation of i-th of OLED subpixel 60；
The index of modulation for each OLED subpixel 60 being calculated is established into index of modulation look-up table, and is saved in storage
In module 30；
Then, OLED subpixel 60 all in the OLED display panel is adjusted to Lmax0When, measure what is obtained
The feedback current of each OLED subpixel 60, it is the maximum feedback electric current of each OLED subpixel 60 by the feedback current, builds
Vertical maximum feedback current look-up table is stored in memory module 30.
Specifically, the object feedback electric current is calculated according to following equation in the compensation calculation module 30：
Wherein, grayiThe initial GTG of i-th of the OLED subpixel 60 currently provided for GTG input module 10, Igrayi
For i-th of OLED subpixel 60 to should initial GTG object feedback electric current, ImaxiFor i-th of OLED subpixel 60 most
Big feedback current.
Further, the weight coefficient is calculated according to following equation in the compensation calculation module 30：
Wherein, σiFor the weight coefficient of i-th of OLED subpixel, IfbiI-th of electricity is measured for the current monitoring module 70
Flow the actual feedback currents of monitoring modular 70.
Further, weight modulation module 20 and target gray scale is drawn according to the following equation adjustment initial GTG：
grayi'=grayi·σi
Wherein, grayi' for the target gray scale of i-th OLED subpixel.
Due to the life time decay of Organic Light Emitting Diode, the luminosity of Organic Light Emitting Diode can decline, and flow through organic
The electric current of light emitting diode can also decline, thus after long-time use, actual maximum feedback electric current, which can be less than, originally to be measured
Maximum feedback electric current, now, it is necessary to maximum feedback electric current is modified, to ensure the accuracy of compensation, therefore, the present invention
OLED display panel compensation system, in addition to：Calibration module 80, the calibration module 80 and the GTG input module
10th, memory module 30 and current monitoring module 70 are connected, and the initial GTG for being provided in the GTG input module 10 is equal to
During maximum gray, the actual feedback currents of the OLED subpixel 60 and the maximum feedback electric current measured in advance, and in institute
When stating the actual feedback currents of OLED subpixel 60 less than the maximum feedback electric current measured in advance, an electric current zoom factor is generated,
The maximum feedback electric current of each OLED subpixel 60 is adjusted by the electric current zoom factor.
Specifically, the electric current zoom factor is equal to the actual feedback currents of i-th of the OLED subpixel 60 currently measured
The ratio for the maximum feedback electric current being stored in i-th of OLED subpixel 60 in maximum feedback current look-up table.
Specifically, in some embodiments of the invention, according to electric current zoom factor adjustment each OLED
The method of the maximum feedback electric current of pixel 60 is：By each OLED subpixel in original maximum feedback current look-up table
60 maximum feedback electric current is multiplied by electric current zoom factor, draws new maximum feedback current look-up table, and with new maximum feedback
Current look-up table is replaced original maximum feedback current look-up table and is stored in memory module 30.
Specifically, in other embodiments of the present invention, each OLED is adjusted according to the electric current zoom factor
The method of the maximum feedback electric current of sub-pixel 60 is：One register is set, for preserving the electric current zoom factor, compensation calculation
Module 30 finds maximum feedback electric current from maximum feedback ammeter every time, and the maximum feedback electric current is multiplied by into electric current contracting
Put coefficient, draw scaling after maximum feedback electric current, and with scale after maximum feedback Current calculation object feedback electric current, initially
When, the electric current zoom factor preserved in register is 1, and the new electric current zoom factor that calibration module 80 generates every time can be used new
Electric current zoom factor replace register in original electric current zoom factor.
Specifically, in some embodiments of the invention, as shown in Fig. 2 the OLED subpixel 60 includes：The first film
Transistor T1, the second thin film transistor (TFT) T2, the 3rd thin film transistor (TFT) T3, the 4th thin film transistor (TFT) T4, electric capacity C1 and organic light emission
Diode D1；
Wherein, the grid access scanning signal SCAN of the first film transistor T1, source electrode access data voltage
Vdata, drain electrode are electrically connected with first node A；The grid of the second thin film transistor (TFT) T2 is electrically connected with first node A, source electrode
Power supply high voltage OVDD is accessed, drain electrode is electrically connected with section point B；The grid access scanning letter of the 3rd thin film transistor (TFT) T3
Number SACN, source electrode are electrically connected with section point B, and drain electrode is electrically connected with current monitoring module 70；
The grid access LED control signal EM of the 4th thin film transistor (TFT) T4, source electrode are electrically connected with section point B, leakage
Pole is electrically connected with organic light emitting diode D1 anode；
The first end of the electric capacity C1 is electrically connected with first node A, and the second end is electrically connected with the second thin film transistor (TFT) T2's
Source electrode；
The negative electrode access power supply low-voltage OVSS of the Organic Light Emitting Diode D1.
It should be noted that include as shown in Figure 3 in combination with Fig. 2, the specific work process of the OLED subpixel 60：
In two stages, compensated stage and glow phase are divided into, wherein compensated stage is divided into current monitoring stage and adjustment again
In the stage, initially enter the current monitoring stage in compensated stage, the scanning signal SCAN controls described first and the 3rd film
Transistor T1 and T3 are opened, and LED control signal EM controls the 4th thin film transistor (TFT) T4 to close, Organic Light Emitting Diode D1
Do not light, data voltage Vdata write-in first node A, now weight coefficient for initialization weight coefficient, generally 1, data
Voltage Vdata corresponds to the data voltage of initial GTG, and the second thin film transistor (TFT) T2 is opened, the monitoring feedback electricity of current monitoring module 70
Stream, the adjusting stage in compensated stage is subsequently entered, compensation calculation module 30 draws weight coefficient according to feedback current, and weighting is adjusted
Molding block 20 obtains target gray scale, the data voltage write-in of the corresponding target gray scale of the generation of D/A converter module 50 according to weight coefficient
OLED subpixel 60, finally enter glow phase, the scanning signal SCAN controls described first and the 3rd thin film transistor (TFT) T1
Closed with T3, LED control signal EM controls the 4th thin film transistor (TFT) T4 to open, and the second thin film transistor (TFT) T2 is in electric capacity C1
In the presence of, state is maintained open, Organic Light Emitting Diode D1 lights.
Referring to Fig. 4, the present invention also provides a kind of compensation method of OLED display panel, shown applied to above-mentioned OELD
The compensation device of panel, comprises the following steps：
Step S1, GTG input module 10 provides initial ash to the weighting modulation module 20 and compensation calculation module 30
Rank；
Step S2, current monitoring module 70 monitors the actual feedback currents of the OLED subpixel 60, and by the reality
Feedback current is transferred to compensation calculation module 30；
Step S3, compensation calculation module 30 is according to the initial GTG and the index of modulation and the maximum feedback electricity measured in advance
Stream, be calculated to should initial GTG object feedback electric current, and according to the object feedback electric current and actual feedback currents,
Weight coefficient is calculated；
Step S4, weight modulation module 20 to be adjusted the initial GTG according to the weight coefficient, draw target
GTG；
Step S5, the target gray scale is converted to data voltage by D/A converter module 50, and inputs the OLED picture
Element 60, luminance compensation is carried out to the OLED subpixel 60.
In summary, the present invention provides a kind of compensation system and method for OLED display panel.The system includes：GTG is defeated
Enter module, the weighting modulation module being connected with the GTG input module and the GTG input module and weighting modulation module
Connected compensation calculation module, the D/A converter module being connected with the weighting modulation module and the D/A converter module
Connected OLED subpixel, the current monitoring module being connected with the OLED subpixel and compensation calculation module；The compensation
Computing module can input initial GTG and the index of modulation and maximum feedback electric current that measure in advance, meter according to GTG input module
Calculate obtain to should initial GTG object feedback electric current, and arrived according to the object feedback electric current and current monitoring module monitors
OLED subpixel actual feedback currents, be calculated weight coefficient, the weighting modulation module can be according to the weighting
The initial GTG of coefficient adjustment draws target gray scale, lights the OLED subpixel using the target gray scale, can compensate for by having
Non-uniform phenomenon is shown caused by the aging of machine light emitting diode in itself, reduces the memory space needed for compensation system, lifting is aobvious
Show the picture uniformity of panel.
It is described above, for the person of ordinary skill of the art, can be with technique according to the invention scheme and technology
Other various corresponding changes and deformation are made in design, and all these changes and deformation should all belong to the claims in the present invention
Protection domain.
Claims (10)
- A kind of 1. compensation system of OLED display panel, it is characterised in that including：GTG input module (10) and the GTG The connected weighting modulation module (20) of input module (10) and the GTG input module (10) and weighting modulation module (20) are equal Connected compensation calculation module (30), the D/A converter module (50) being connected with the weighting modulation module (20) and the number The connected OLED subpixel (60) of mould modular converter (50) and the OLED subpixel (60) and compensation calculation module (30) are homogeneous Current monitoring module (70) even；The GTG input module (10) is initial for being provided to the weighting modulation module (20) and compensation calculation module (30) GTG；The current monitoring module (70), for monitoring the actual feedback currents of the OLED subpixel (60), and by the reality Border feedback current is transferred to compensation calculation module (30)；The compensation calculation module (30), for according to the initial GTG and the index of modulation and the maximum feedback electricity measured in advance Stream, be calculated to should initial GTG object feedback electric current, and according to the object feedback electric current and actual feedback currents, Weight coefficient is calculated；The weighting modulation module (20), for being adjusted according to the weight coefficient to the initial GTG, draw target GTG；The D/A converter module (50), for the target gray scale to be converted into data voltage, and input the OLED picture Plain (60), luminance compensation is carried out to the OLED subpixel (60).
- 2. the compensation system of OLED display panel as claimed in claim 1, it is characterised in that also include：Counted with the compensation The connected memory module (40) of module (30) is calculated, memory module (40) internal memory contains an index of modulation look-up table and a maximum Feedback current look-up table, OLED subpixel (60) all in the OLED display panel is provided with the index of modulation look-up table The index of modulation, OLED subpixel (60) all in the OLED display panel is provided with the maximum feedback current look-up table Maximum feedback electric current；The compensation calculation module (30) is additionally operable to from the index of modulation look-up table and the maximum feedback current look-up table The index of modulation of the OLED subpixel currently to be compensated (60) and the OLED subpixel (60) currently to be compensated are searched respectively Maximum feedback electric current.
- 3. the compensation system of OLED display panel as claimed in claim 2, it is characterised in that obtain each OLED subpixel (60) formula of the index of modulation is：<mrow> <msub> <mi>K</mi> <mi>i</mi> </msub> <mo>=</mo> <msup> <mrow> <mo>(</mo> <mfrac> <mrow> <msub> <mi>Lmax</mi> <mn>0</mn> </msub> </mrow> <mrow> <msub> <mi>Lmax</mi> <mi>i</mi> </msub> </mrow> </mfrac> <mo>)</mo> </mrow> <mfrac> <mn>1</mn> <mi>&gamma;</mi> </mfrac> </msup> </mrow>Wherein, KiFor the index of modulation of i-th of OLED subpixel (60), LmaxiShow for i-th of OLED subpixel (60) in OLED Show the brightness under the maximum gray of panel, Lmax0For the OLED display panel when inputting maximum gray all OLED pictures The brightness of a minimum OLED subpixel (60) of brightness in plain (60), γ are the gamma index of the OLED display panel.
- 4. the compensation system of OLED display panel as claimed in claim 3, it is characterised in that each OLED subpixel (60) maximum feedback electric current is：OLED subpixel (60) all in the OLED display panel is adjusted to Lmax0When, Measure the feedback current of obtained each OLED subpixel (60).
- 5. the compensation system of OLED display panel as claimed in claim 4, it is characterised in that the compensation calculation module (30) The object feedback electric current is calculated according to following equation：<mrow> <msub> <mi>Igray</mi> <mi>i</mi> </msub> <mo>=</mo> <msub> <mi>Imax</mi> <mi>i</mi> </msub> <mo>&CenterDot;</mo> <msup> <mrow> <mo>(</mo> <mfrac> <mrow> <msub> <mi>gray</mi> <mi>i</mi> </msub> </mrow> <mrow> <mn>255</mn> <msub> <mi>K</mi> <mi>i</mi> </msub> </mrow> </mfrac> <mo>)</mo> </mrow> <mi>&gamma;</mi> </msup> </mrow>Wherein, grayiThe initial GTG of i-th of the OLED subpixel (60) currently provided for GTG input module (10), Igrayi For i-th of OLED subpixel (60) to should initial GTG object feedback electric current, ImaxiFor i-th of OLED subpixel (60) Maximum feedback electric current.
- 6. the compensation system of OLED display panel as claimed in claim 5, it is characterised in that the compensation calculation module (30) The weight coefficient is calculated according to following equation：<mrow> <msub> <mi>&sigma;</mi> <mi>i</mi> </msub> <mo>=</mo> <msup> <mrow> <mo>(</mo> <mfrac> <mrow> <msub> <mi>Igray</mi> <mi>i</mi> </msub> </mrow> <mrow> <msub> <mi>Ifb</mi> <mi>i</mi> </msub> </mrow> </mfrac> <mo>)</mo> </mrow> <mfrac> <mn>1</mn> <mi>&gamma;</mi> </mfrac> </msup> <mo>;</mo> </mrow>Wherein, σiFor the weight coefficient of i-th of OLED subpixel, IfbiI-th of electric current is measured for the current monitoring module (70) The actual feedback currents of monitoring modular (70).
- 7. the compensation system of OLED display panel as claimed in claim 6, it is characterised in that weighting modulation module (20) basis The following equation adjustment initial GTG draws target gray scale：grayi'=grayi·σiWherein, grayi' for the target gray scale of i-th OLED subpixel.
- 8. the compensation system of OLED display panel as claimed in claim 2, it is characterised in that also include：Calibration module (80), The calibration module (80) is connected with the GTG input module (10), memory module (40) and current monitoring module (70), uses When the initial GTG provided in the GTG input module (10) is equal to maximum gray, the OLED subpixel (60) Actual feedback currents and the maximum feedback electric current measured in advance, and be less than in the actual feedback currents of the OLED subpixel (60) During the maximum feedback electric current measured in advance, an electric current zoom factor is generated, is adjusted by the electric current zoom factor described each The maximum feedback electric current of OLED subpixel (60).
- 9. the compensation system of OLED display panel as claimed in claim 1, it is characterised in that OLED subpixel (60) bag Include：First film transistor (T1), the second thin film transistor (TFT) (T2), the 3rd thin film transistor (TFT) (T3), the 4th thin film transistor (TFT) (T4), electric capacity (C1) and Organic Light Emitting Diode (D1)；The grid access scanning signal (SCAN) of the first film transistor (T1), source electrode access data voltage (Vdata), leakage Pole is electrically connected with first node (A)；The grid of second thin film transistor (TFT) (T2) is electrically connected with first node (A), and source electrode accesses power supply high voltage (OVDD), Drain electrode is electrically connected with section point (B)；The grid access scanning signal (SACN) of 3rd thin film transistor (TFT) (T3), source electrode are electrically connected with section point (B), leakage Pole is electrically connected with current monitoring module (70)；The grid access LED control signal (EM) of 4th thin film transistor (TFT) (T4), source electrode are electrically connected with section point (B), Drain electrode is electrically connected with the anode of organic light emitting diode (D1)；The first end of the electric capacity (C1) is electrically connected with first node (A), and the second end is electrically connected with the second thin film transistor (TFT) (T2) Source electrode；The negative electrode access power supply low-voltage (OVSS) of the Organic Light Emitting Diode (D1).
- 10. a kind of compensation method of OLED display panel, it is characterised in that applied to as described in any one of claim 1 to 9 The compensation device of OELD display panels, comprises the following steps：Step S1, GTG input module (10) provides initial ash to the weighting modulation module (20) and compensation calculation module (30) Rank；Step S2, current monitoring module (70) monitors the actual feedback currents of the OLED subpixel (60), and by the reality Feedback current is transferred to compensation calculation module (30)；Step S3, compensation calculation module (30) is according to the initial GTG and the index of modulation and the maximum feedback electricity measured in advance Stream, be calculated to should initial GTG object feedback electric current, and according to the object feedback electric current and actual feedback currents, Weight coefficient is calculated；Step S4, weight modulation module (20) to be adjusted the initial GTG according to the weight coefficient, draw target ash Rank；Step S5, the target gray scale is converted to data voltage by D/A converter module (50), and inputs the OLED subpixel (60) luminance compensation, is carried out to the OLED subpixel (60).
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108877640A (en) * | 2018-09-27 | 2018-11-23 | 京东方科技集团股份有限公司 | Display panel and displaying panel driving method |
| CN109473059A (en) * | 2019-01-24 | 2019-03-15 | 京东方科技集团股份有限公司 | Show electric current determination, compensation method, device, display device and storage medium |
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| WO2023159557A1 (en) * | 2022-02-28 | 2023-08-31 | 京东方科技集团股份有限公司 | Driving method for display panel, driving circuit, and display device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105280140A (en) * | 2015-11-24 | 2016-01-27 | 深圳市华星光电技术有限公司 | Sensing circuit and corresponding OLED display equipment |
| CN106328061A (en) * | 2016-10-14 | 2017-01-11 | 深圳市华星光电技术有限公司 | OLED pixel mixing and compensating circuit and method |
| CN106504702A (en) * | 2016-10-18 | 2017-03-15 | 深圳市华星光电技术有限公司 | AMOLED pixel-driving circuits and driving method |
| CN106652911A (en) * | 2017-02-24 | 2017-05-10 | 深圳市华星光电技术有限公司 | OLED (organic light-emitting diode) pixel drive circuit and OLED display device |
| CN107039004A (en) * | 2017-06-08 | 2017-08-11 | 深圳市华星光电技术有限公司 | The aging compensation approach of AMOLED display panels |
| CN107393481A (en) * | 2017-08-23 | 2017-11-24 | 京东方科技集团股份有限公司 | Organic Light Emitting Diode OLED life-span aging method and system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7847763B2 (en) * | 2005-06-09 | 2010-12-07 | Himax Technologies, Inc. | Method for driving passive matrix OLED |
| CN104036722B (en) * | 2014-05-16 | 2016-03-23 | 京东方科技集团股份有限公司 | Pixel unit drive circuit and driving method, display device |
| CN104361859B (en) * | 2014-11-18 | 2017-01-11 | 深圳市华星光电技术有限公司 | Display device and brightness adjusting method thereof |
| CN106023888B (en) * | 2016-07-06 | 2018-06-29 | 云南北方奥雷德光电科技股份有限公司 | OLED minitype displayer constant luminance modulator approach |
| CN106297658B (en) * | 2016-10-28 | 2018-10-23 | 昆山国显光电有限公司 | A kind of current compensation device, method and organic LED display panel |
| CN106531069B (en) * | 2016-12-29 | 2019-03-19 | 上海天马有机发光显示技术有限公司 | A kind of control chip, control method, display device and control host |
-
2017
- 2017-11-30 CN CN201711242835.8A patent/CN107767815B/en active Active
-
2018
- 2018-01-09 WO PCT/CN2018/071847 patent/WO2019104840A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105280140A (en) * | 2015-11-24 | 2016-01-27 | 深圳市华星光电技术有限公司 | Sensing circuit and corresponding OLED display equipment |
| CN106328061A (en) * | 2016-10-14 | 2017-01-11 | 深圳市华星光电技术有限公司 | OLED pixel mixing and compensating circuit and method |
| CN106504702A (en) * | 2016-10-18 | 2017-03-15 | 深圳市华星光电技术有限公司 | AMOLED pixel-driving circuits and driving method |
| CN106652911A (en) * | 2017-02-24 | 2017-05-10 | 深圳市华星光电技术有限公司 | OLED (organic light-emitting diode) pixel drive circuit and OLED display device |
| CN107039004A (en) * | 2017-06-08 | 2017-08-11 | 深圳市华星光电技术有限公司 | The aging compensation approach of AMOLED display panels |
| CN107393481A (en) * | 2017-08-23 | 2017-11-24 | 京东方科技集团股份有限公司 | Organic Light Emitting Diode OLED life-span aging method and system |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108877640B (en) * | 2018-09-27 | 2021-11-12 | 京东方科技集团股份有限公司 | Display panel and display panel driving method |
| CN108877640A (en) * | 2018-09-27 | 2018-11-23 | 京东方科技集团股份有限公司 | Display panel and displaying panel driving method |
| CN109473059B (en) * | 2019-01-24 | 2020-12-04 | 京东方科技集团股份有限公司 | Display current determining method, display current compensating method, display current determining device, display current compensating device, display device, and storage medium |
| CN109473059A (en) * | 2019-01-24 | 2019-03-15 | 京东方科技集团股份有限公司 | Show electric current determination, compensation method, device, display device and storage medium |
| US11348507B2 (en) | 2019-01-24 | 2022-05-31 | Boe Technology Group Co., Ltd. | Method and apparatus for identifying current |
| WO2020151590A1 (en) * | 2019-01-24 | 2020-07-30 | 京东方科技集团股份有限公司 | Display current determination and compensation method and device, and display device and storage medium |
| CN111951725A (en) * | 2019-05-15 | 2020-11-17 | 三星显示有限公司 | Display device |
| CN113228152A (en) * | 2019-05-17 | 2021-08-06 | 华为技术有限公司 | Device and method for controlling screen brightness |
| WO2020232588A1 (en) * | 2019-05-17 | 2020-11-26 | 华为技术有限公司 | Screen brightness control apparatus and method |
| CN113228152B (en) * | 2019-05-17 | 2022-09-09 | 华为技术有限公司 | Device and method for controlling screen brightness |
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| CN112581912A (en) * | 2019-09-29 | 2021-03-30 | 上海和辉光电有限公司 | Display compensation method, display compensation device and electronic equipment |
| CN113597638B (en) * | 2019-09-30 | 2024-01-09 | 京东方科技集团股份有限公司 | Driver, display device and optical compensation method thereof |
| CN113597638A (en) * | 2019-09-30 | 2021-11-02 | 京东方科技集团股份有限公司 | Driver, display device and optical compensation method thereof |
| CN110910826A (en) * | 2019-12-19 | 2020-03-24 | 京东方科技集团股份有限公司 | Brightness compensation method and device of display panel and display module |
| CN110827745B (en) * | 2019-12-26 | 2022-06-14 | 武汉天马微电子有限公司 | Display panel and pixel compensation data generation method and device thereof |
| CN110827745A (en) * | 2019-12-26 | 2020-02-21 | 武汉天马微电子有限公司 | Display panel and pixel compensation data generation method and device thereof |
| CN112581909A (en) * | 2020-12-30 | 2021-03-30 | 北京奕斯伟计算技术有限公司 | Display compensation method and device and display device |
| CN112992059B (en) * | 2021-02-02 | 2022-03-04 | 深圳精智达技术股份有限公司 | Method and related device for adjusting Gamma of OLED display screen |
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| WO2019104840A1 (en) | 2019-06-06 |
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