CN106297658A - A kind of current compensation device, method and organic LED display panel - Google Patents
A kind of current compensation device, method and organic LED display panel Download PDFInfo
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- CN106297658A CN106297658A CN201610966985.2A CN201610966985A CN106297658A CN 106297658 A CN106297658 A CN 106297658A CN 201610966985 A CN201610966985 A CN 201610966985A CN 106297658 A CN106297658 A CN 106297658A
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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]
Abstract
The invention discloses a kind of current compensation device, method and organic light emitting diode display floater, including: control circuit and Organic Light Emitting Diode OLED pixel circuit.Described control circuit, determines the luminosity of OLED in described OLED pixel circuit, and determines the current value after the compensation flowing through described OLED according to the luminosity of described OLED；Described OLED pixel circuit, according to the current value after the described compensation that described control circuit determines, drives described OLED luminous.Luminosity by the OLED in detection OLED pixel circuit, OLED is carried out current compensation, to avoid OLED because of the problem of the aging luminance-reduction brought, make the display brightness of the OLED after compensation be promoted, effectively promote the display quality of OLED display panel.
Description
Technical field
The present invention relates to technical field of semiconductors, particularly relate to a kind of current compensation device, method and organic light emission two grades
Pipe display floater.
Background technology
Along with the development of display floater technology, Organic Light Emitting Diode (Organic Lighting Emitting
Diode, OLED) display floater is as a kind of self luminous display device, with traditional liquid crystal display panel of thin film transistor
(Thin Film Transistor Liquid Crystal Display, TFT-LCD) compares, and not only need not backlight, also
There is the advantages such as lightweight, shock resistance good, response time is fast, visual angle is wide, energy consumption is low, low-temperature characteristics is good, be widely used in
In every field.
Generally, when OLED display panel is when receiving the picture signal of external equipment input, through analog digital conversion equipment
Picture signal corresponding digital signals is converted into analogue signal, and by analogue signal input to OLED pixel circuit, to drive
The OLED that thin film transistor (TFT) in OLED pixel circuit is corresponding is luminous.
But, owing to OLED is along with the growth of the time of use, the situation that luminosity is dimmed, this feelings easily occur
It is aging that shape is referred to as in the industry OLED.I.e. for external equipment input same picture signal, occur aging OLED with
Not yet occur aging OLED to compare, occur the aging OLED display brightness when showing this picture signal by low
In the aging OLED display brightness when showing this picture signal not yet occurs.
In sum, need a kind of current compensation device badly, be used for solving in prior art OLED device in OLED display panel
The problem that the aging display brightness caused of part reduces.
Summary of the invention
In view of this, a kind of current compensation device, method and organic light-emitting diode display are embodiments provided
Panel, for solving the problem that in prior art, in OLED display panel, the aging display brightness caused of OLED reduces.
Embodiments provide a kind of current compensation device, including: control circuit and Organic Light Emitting Diode OLED
Image element circuit, wherein:
Described control circuit, for determining the luminosity of the OLED in described OLED pixel circuit, and according to institute
State the current value after the luminosity of OLED determines the compensation flowing through described OLED；
Described OLED pixel circuit, the current value after the described compensation determined according to described control circuit, drive institute
State OLED luminous.
The embodiment of the present invention additionally provides a kind of current compensation method, including:
Determine the luminosity of OLED in Organic Light Emitting Diode OLED pixel circuit；
Luminosity according to described OLED determines the current value after the compensation flowing through described OLED；
According to flowing through the current value after the described compensation of described OLED, drive described OLED luminous.
The embodiment of the present invention additionally provides a kind of organic LED display panel, including: control circuit and organic
Optical diode OLED pixel circuit.
The present invention has the beneficial effect that:
Current compensation device in the embodiment of the present invention comprises control circuit and OLED pixel circuit, and control circuit is for really
Determine the luminosity of OLED in OLED pixel circuit, and determine according to the luminosity of described OLED flow through described
Current value after the compensation of OLED；OLED pixel circuit is after according to the described compensation of the described OLED determined
Current value, drives described OLED luminous.So, by the luminosity of the OLED in detection OLED pixel circuit,
OLED is carried out current compensation, with avoid OLED because of the problem of the aging luminance-reduction brought, after making compensation
The display brightness of OLED is promoted, and effectively promotes the display quality of OLED display panel.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make
Accompanying drawing briefly introduce, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for this
From the point of view of the those of ordinary skill in field, on the premise of not paying creative work, it is also possible to obtain it according to these accompanying drawings
His accompanying drawing.
The structural representation of a kind of current compensation device that Fig. 1 provides for the embodiment of the present invention；
The schematic flow sheet of a kind of current compensation method that Fig. 2 provides for the embodiment of the present invention；
The structural representation of the organic LED display panel that Fig. 3 provides for the embodiment of the present invention.
Detailed description of the invention
In order to realize the purpose of the present invention, embodiments provide a kind of current compensation device, method and organic
Light diode display floater, current compensation device comprises control circuit and OLED pixel circuit, and control circuit is used for determining OLED
The luminosity of the OLED in image element circuit, and determine according to the luminosity of described OLED and flow through described OLED device
Current value after the compensation of part；OLED pixel circuit is for according to the electric current after the described compensation of the described OLED determined
Value, drives described OLED luminous.So, by the luminosity of the OLED in detection OLED pixel circuit, right
OLED carries out current compensation, to avoid OLED because of the problem of the aging luminance-reduction brought, makes the OLED after compensation
The display brightness of device is promoted, and effectively promotes the display quality of OLED display panel.
Below in conjunction with Figure of description, each embodiment of the present invention is described in further detail.Obviously, described
Embodiment is only some embodiments of the present invention rather than whole embodiments.Based on the embodiment in the present invention, this area
All other embodiments that those of ordinary skill is obtained under not making creative work premise, broadly fall into present invention protection
Scope.
Fig. 1 is the structural representation of a kind of current compensation device that the embodiment of the present invention provides.Described current compensation device
Including: control circuit 11 and OLED pixel circuit 12, wherein:
Described control circuit 11, for determining the luminosity of the OLED in described OLED pixel circuit, and according to
The luminosity of described OLED determines the current value after the compensation flowing through described OLED；
Described OLED pixel circuit 12, the current value after the described compensation determined according to described control circuit, drive
Described OLED is luminous.
Described control circuit 11, specifically for detecting the anode voltage of OLED, and according to the anode electricity of OLED
Preset relation between pressure and luminosity, determines the OLED luminosity that the described anode voltage detected is corresponding.
The structure of described OLED pixel circuit 12 described in the embodiment of the present invention 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, the 5th thin film transistor (TFT) T5, the first control
Signal input part em processed, the second control signal input Scan, the 3rd control signal input Tsen, the 4th control signal input
End OLEDsen, OLED, electric capacity C, the first power supply, second source, wherein:
The grid of described the first film transistor is connected with the drain electrode of described 3rd thin film transistor (TFT), and 4th thin with described
The source electrode of film transistor connects, and the also negative pole with described electric capacity is connected；The source electrode of described the first film transistor and described first
Power supply connects, and is connected with the positive pole of described electric capacity；The drain electrode of described the first film transistor and described second thin film transistor (TFT)
Source electrode connect, and be connected with the source electrode of the 5th thin film transistor (TFT)；
The grid of described second thin film transistor (TFT) is connected with described first control signal input, drain electrode and described OLED device
The anode of part connects；
The grid of described 3rd thin film transistor (TFT) is connected with described second control signal input, source electrode and digital to analog converter
Connect；
The grid of described 4th thin film transistor (TFT) is connected with described 3rd control signal input, drain electrode and analog-digital converter
Connect, and be connected with the drain electrode of described 5th thin film transistor (TFT)；
The grid of described 5th thin film transistor (TFT) is connected with described 4th control signal input；
The negative electrode of described OLED is connected with described second source.
It should be noted that the structure of OLED pixel circuit 12 can be structure described in the embodiment of the present invention, also
Can be other OLED pixel circuit structure, be not specifically limited here.
Due to the restricted lifetime of the anode material of OLED, the anode voltage of OLED can increase over time and
Decline, and then cause the luminosity of OLED to decline, the most in embodiments of the present invention can be by experiment or reality
The modes such as detection determine the preset relation between the anode voltage of OLED and luminosity, and then by detection OLED
Actual anode voltage obtain the actual luminosity of OLED.
Specifically, structure based on OLED pixel circuit 12 described in the embodiment of the present invention, described control circuit 11
When the second thin film transistor (TFT) conducting, the 5th thin film transistor (TFT) conducting, the first film transistor driving OLED luminescence, detection
The anode voltage of OLED, i.e. detection obtain the actual anode voltage of OLED.
It should be noted that the conducting of the second thin film transistor (TFT) and shutoff are by the electricity of input to the first control signal input
Flat control.Such as, when the level of input to the first control signal input is high level, the second thin film transistor (TFT) turns off, when
Input to the level of the first control signal input be low level time, the second thin film transistor (TFT) conducting.
Similarly, the conducting of the 3rd thin film transistor (TFT) and shutoff are by the level control of input value the second control signal input
System, the conducting of the 4th thin film transistor (TFT) and shutoff are by the Automatic level control of input to the 3rd control signal input, and the 5th thin film is brilliant
The conducting of body pipe is controlled letter by the Automatic level control of input to the 4th control signal input, concrete control method with first with shutoff
It is identical with the method for shutoff that the incoming level of number input controls the conducting of the second thin film transistor (TFT), repeats no more here.
It should be noted that except using said method to control the second thin film transistor (TFT), the 3rd thin film transistor (TFT), the 4th thin
Film transistor and the conducting of the 5th thin film transistor (TFT) and shutoff, it is also possible to use other control method, the most do not do concrete limit
Fixed.
In another embodiment of the present invention, described control circuit 11 can also include memorizer, and described memorizer is used
The default pass between the anode voltage of OLED and luminosity is determined by experiment or the mode such as actually detected in storage
System, this preset relation can be stored in the brightness decay synopsis of OLED, it is also possible to is stored in other media, this
In be not specifically limited.
Control circuit 11 is after the anode voltage of detection OLED, according to the anode of the OLED of storage in memorizer
Preset relation between voltage and luminosity, the actual anode voltage of contrast OLED and the brightness decay pair of OLED
According to the anode voltage of the OLED described in table, determine the actual luminosity of OLED.
Preferably, in embodiments of the present invention, described control circuit 11 also includes analog-digital converter, described analog-digital converter
The anode voltage of the OLED detected is converted into the first digital code, except the brightness of storage OLED in described memorizer
Beyond decay synopsis, it is also possible to store described first digital code.
The luminosity of the described OLED that described control circuit 11 obtains according to detection, is calculated really by below equation
Constant current current value after the compensation of described OLED:
Iem=100/P*n/m*IReference；
Wherein, IemFor being calculated the current value after the compensation flowing through described OLED, P is sending out of described OLED
Brightness, n is the grey decision-making of image to be displayed, m by the OLED display device comprising described current compensation device supported total
Grey decision-making, IReferenceThe current value provided by the reference power source comprised in described control circuit.
The following detailed description of the structure of the OLED pixel circuit 12 provided based on the embodiment of the present invention, control circuit 11 how
The current value after the compensation flowing through described OLED is determined according to the luminosity detecting the described OLED obtained.
First, control circuit 11 determines the first grid electricity of described the first film transistor during the first film transistor cutoff
Pressure, and determine the second grid voltage of described the first film transistor during the first film transistor turns；
Secondly, control circuit 11 is according to described primary grid voltage, described second grid voltage, the sending out of described OLED
Brightness and the threshold voltage of described the first film transistor, determine the current value after the compensation flowing through described OLED.
Alternatively, described control circuit 11 also includes: the first contactor, ground wire (GND), wherein:
Described first contactor, for controlling the break-make between described OLED pixel circuit and ground wire；
Described ground wire, for making described OLED pixel circuit ground connection when described first contactor Guan Bi.
Specifically, control circuit 11 turns off at the second thin film transistor (TFT), the 3rd thin film transistor (TFT) turns off, the 4th film crystal
Pipe conducting, the 5th thin film transistor (TFT) conducting, and when the first contactor is transformed to disconnect by Guan Bi, detect the first film transistor
The primary grid voltage of the first film transistor during cut-off.
It should be noted that when closing the first contactor, the voltage of electric capacity negative pole becomes low level, the first film is brilliant
The grid voltage of body pipe becomes low level, and the first film transistor is in the conduction state, when the first contactor is by closing conversion
During for disconnecting, electric capacity is charged by the first power supply when the first film transistor turns, until the first film transistor cutoff,
Now, satisfied following first expression formula of the primary grid voltage of the first film transistor:
Vg1=Vdd-| Vth |,
Wherein, Vg1 is primary grid voltage, and Vdd is the first supply voltage, and Vth is the threshold value electricity of the first film transistor
Pressure.
Alternatively, described control circuit 11 also includes: second circuit switch, reference current source, wherein:
Described second circuit switchs, for controlling the break-make between described OLED pixel circuit and described reference current source；
Described reference current source, for providing OLED when described second circuit switch Guan Bi for described OLED pixel circuit
The current value of OLED is flowed through when device does not occurs aging.
Specifically, control circuit 11 turns off at the second thin film transistor (TFT), the 3rd thin film transistor (TFT) turns off, the 4th film crystal
Pipe conducting, the 5th thin film transistor (TFT) conducting, and during second circuit switch Guan Bi, during detection the first film transistor turns, first is thin
The second grid voltage of film transistor, is converted into the 3rd digital code by second grid voltage, and transmission is to memorizer.
When closing second circuit switch, the electric current of reference current source can flow through OLED pixel circuit, makes the first film brilliant
Body pipe turns on, now, and satisfied following second expression formula of the second grid voltage of the first film transistor:
Wherein, Vg2 is second grid voltage, and K is the dielectric constant of the first film transistor gate material, and Vth is first
The threshold voltage of thin film transistor (TFT).
It should be noted that when determining primary grid voltage and second grid voltage, can first determine first grid electricity
Pressure, then determine second grid voltage, it is also possible to first determine second grid voltage, then determine primary grid voltage, the most do not do and have
Body limits.
Preferably, described analog-digital converter is additionally operable to the primary grid voltage detected is converted into the second digital code, with
And the second grid voltage detected is converted into the 3rd digital code, described memorizer is additionally operable to storage and represents primary grid voltage
The second digital code and storage represent second grid voltage the 3rd digital code.
Specifically, when there being detection signal input current to compensate equipment, described control circuit 11 is according to described first grid
The 3rd digital code that the second digital code that voltage is corresponding, described second grid voltage are corresponding, the luminosity of described OLED,
Total grey decision-making that the grey decision-making detecting signal and the OLED display device comprising described current compensation device are supported, to detection
Signal is modulated.
Detection signal after modulation is converted to analogue signal by described control circuit 11, contains and drive in described analogue signal
The data voltage of the first film transistor of dynamic OLED pixel circuit 12, satisfied following 3rd expression formula of described data voltage:
Wherein, Vdata is data voltage.
When the 3rd thin film transistor (TFT) conducting, described data voltage is transmitted to OLED pixel circuit 12 by control circuit 11
The grid of the first film transistor, now, flows through the electric current after the compensation of OLED and meets:
Iem=K (Vdd-Vdata-Vth)2,
Wherein, IemFor being calculated the current value after the compensation flowing through described OLED.
According to the first expression formula, the second expression formula and the 3rd expression formula, after obtaining flowing through the compensation of described OLED
The computing formula of current value is:
Iem=100/P*n/m*IReference。
It should be noted that control circuit 11 determines the computing formula of the current value after the compensation flowing through described OLED
Can realize by the way, it is also possible to realize by other means, be not specifically limited here.
In embodiments of the present invention, described control circuit 11 also includes data image signal input, data processor, number
Weighted-voltage D/A converter, wherein:
Described data image signal input, for receiving the digital signal that external equipment sends, and by described numeral letter
Number transmission is to described data processor.
Described data processor, for being modulated described digital signal；
Described digital to analog converter, for being converted into analogue signal by the digital signal after modulation.
Specifically, receive, when the data image signal input in control circuit 11, the digital signal that external equipment sends
Time, described digital signal is modulated by data processor, and the digital signal after modulation is converted into simulation through digital to analog converter
Signal, contains the data voltage of the first film transistor driving OLED pixel circuit 12 in described analogue signal.
Described OLED pixel circuit 12, the current value after the described compensation determined according to described control circuit, drive
Described OLED is luminous.
Specifically, when the 3rd thin film transistor (TFT) conducting, the data voltage in analogue signal is transferred to OLED pixel electricity
The grid of the first film transistor in road 12, it is achieved the conducting of the first film transistor, now, flows through the current value of OLED
Being the current value after the compensation that control circuit determines, OLED pixel circuit drives OLED device according to the current value after described compensation
Part is luminous.
By current compensation device described in the embodiment of the present invention, current compensation device comprises control circuit and OLED
Image element circuit, control circuit is used for determining the luminosity of the OLED in OLED pixel circuit, and according to described OLED device
The luminosity of part determines the current value after the compensation flowing through described OLED；OLED pixel circuit is for according to the institute determined
State the current value after the described compensation of OLED, drive described OLED luminous.So, by detection OLED pixel circuit
In the luminosity of OLED, OLED is carried out current compensation, to avoid OLED because of the aging brightness brought
The problem reduced, makes the display brightness of the OLED after compensation be promoted, and effectively promotes the display matter of OLED display panel
Amount.
Fig. 2 is the schematic flow sheet of a kind of current compensation method that the embodiment of the present invention provides.Described method can be as follows
Shown in.
Step 201: determine the luminosity of OLED in Organic Light Emitting Diode OLED pixel circuit.
In step 201, first control circuit detects the anode voltage of OLED, then at the sun of detection OLED
After pole tension, the OLED anode voltage that measurement is obtained and the brightness decay synopsis of the OLED of storage in memorizer
Contrast, determine the luminosity of OLED.
Wherein, described in the brightness decay synopsis of the OLED stored in memorizer is the anode electricity of OLED
Preset relation between pressure and luminosity.
Step 202: determine the current value after the compensation flowing through described OLED according to the luminosity of OLED.
In step 202., first, the first grid electricity of the first film transistor when determining the first film transistor cutoff
Pressure, and the second grid voltage of the first film transistor when determining the first film transistor turns；Then, when there being detection signal
During input, according to primary grid voltage, second grid voltage, the luminosity of OLED and the threshold of the first film transistor
Threshold voltage, determines the current value after the compensation flowing through described OLED.
Specifically, it is determined that the detailed process of the primary grid voltage of the first film transistor during the first film transistor cutoff
For:
When the second thin film transistor (TFT) shutoff, the 3rd thin film transistor (TFT) turns off, the 4th thin film transistor (TFT) turns on, the 5th thin film is brilliant
Body pipe turns on, and when the first contactor is transformed to disconnect by Guan Bi, described in when detecting described the first film transistor cutoff the
The described primary grid voltage of one thin film transistor (TFT).
Wherein, the expression formula that primary grid voltage meets and the primary grid voltage of the first film transistor in embodiment 1
Expression formula identical, repeat no more here.
When determining the first film transistor turns, the detailed process of the second grid voltage of the first film transistor is:
When the second thin film transistor (TFT) shutoff, the 3rd thin film transistor (TFT) turns off, the 4th thin film transistor (TFT) turns on, the 5th thin film is brilliant
Body pipe turns on, and during second circuit switch Guan Bi, detects described the first film transistor during described the first film transistor turns
Described second grid voltage.
Wherein, the expression formula that second grid voltage meets and the second grid voltage of the first film transistor in embodiment 1
Expression formula identical, repeat no more here.
When there being detection signal input current to compensate equipment, described control circuit is according to primary grid voltage, second grid
Voltage, the luminosity of OLED, the detection grey decision-making of signal and the OLED comprising described current compensation device show and set
The standby total grey decision-making supported, is modulated detection signal.
Then the detection signal after modulation is converted to analogue signal, and will in the case of the 3rd thin film transistor (TFT) conducting
Described analogue signal is transmitted to OLED pixel circuit, makes the first film transistor turns, now, flows through the electric current of OLED i.e.
For the electric current after compensating.
Wherein, the expression formula of the electric current flowing through OLED is identical with the computing formula in embodiment 1, repeats no more here.
Step 203: according to flowing through the current value after the described compensation of described OLED, drive described OLED to send out
Light.
In step 203, described digital signal, when receiving the digital signal that external equipment sends, is entered by control circuit
Row modulation, the digital signal after modulation is converted into analogue signal through digital to analog converter.When the 3rd thin film transistor (TFT) conducting, control
Analogue signal is transmitted to the grid of the first film transistor in OLED pixel circuit by circuit processed, it is achieved the first film transistor
Conducting, now, the current value flowing through OLED is the current value that control circuit determines, OLED pixel circuit is according to described electricity
Flow valuve drives OLED luminous.
Embodiments provide a kind of current compensation method, it is first determined the OLED in OLED pixel circuit
Luminosity, then determines the current value after the compensation flowing through described OLED according to the luminosity of described OLED,
Finally according to flowing through the current value after the described compensation of described OLED, drive described OLED luminous.So, by inspection
Survey the luminosity of OLED in OLED pixel circuit, OLED carried out current compensation, with avoid OLED because of
The problem of the aging luminance-reduction brought, makes the display brightness of the OLED after compensation be promoted, and effectively promotes OLED and shows
Show the display quality of panel.
The structural representation of the Organic Light Emitting Diode OLED display panel that Fig. 3 provides for the embodiment of the present invention.Described
OLED display panel 30 comprises current compensation device 31, and described current compensation device 31 is by control circuit 311 and OLED pixel electricity
Road 312 forms, wherein:
Described control circuit 311, for determining the luminosity of the OLED in OLED pixel circuit, and according to described
The luminosity of OLED determines the current value after the compensation flowing through described OLED；
Described OLED pixel circuit 312, for according to the current value after the described compensation of the described OLED determined, drives
Dynamic described OLED is luminous.
The Organic Light Emitting Diode OLED display panel that the embodiment of the present invention provides, by detection OLED pixel circuit
The luminosity of OLED, carries out current compensation to OLED, to avoid OLED because of the aging luminance-reduction brought
Problem, make the display brightness of the OLED after compensation be promoted, effectively promote the display quality of OLED display panel.
It will be understood by those skilled in the art that embodiments of the invention can be provided as method, device (equipment) or computer
Program product.Therefore, the present invention can use complete hardware embodiment, complete software implementation or combine software and hardware aspect
The form of embodiment.And, the present invention can use at one or more meters wherein including computer usable program code
The upper computer journey implemented of calculation machine usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.)
The form of sequence product.
The present invention is with reference to method, device (equipment) and the flow chart of computer program according to embodiments of the present invention
And/or block diagram describes.It should be understood that can be by each flow process in computer program instructions flowchart and/or block diagram
And/or the flow process in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided to refer to
Order arrives the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce
One machine so that the instruction performed by the processor of computer or other programmable data processing device is produced and is used for realizing
The device of the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and computer or other programmable data processing device can be guided with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in this computer-readable memory produces and includes referring to
Make the manufacture of device, this command device realize at one flow process of flow chart or multiple flow process and/or one square frame of block diagram or
The function specified in multiple square frames.
These computer program instructions also can be loaded in computer or other programmable data processing device so that at meter
Perform sequence of operations step on calculation machine or other programmable devices to produce computer implemented process, thus at computer or
The instruction performed on other programmable devices provides for realizing at one flow process of flow chart or multiple flow process and/or block diagram one
The step of the function specified in individual square frame or multiple square frame.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and amendment to these embodiments.So, claims are intended to be construed to include excellent
Select embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and the modification model without deviating from the present invention to the present invention
Enclose.So, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then
The present invention is also intended to comprise these and changes and modification.
Claims (9)
1. a current compensation device, it is characterised in that including: control circuit and Organic Light Emitting Diode OLED pixel circuit,
Wherein:
Described control circuit, for determining the luminosity of the OLED in described OLED pixel circuit, and according to described
The luminosity of OLED determines the current value after the compensation flowing through described OLED；
Described OLED pixel circuit, the current value after the described compensation determined according to described control circuit, drive described
OLED is luminous.
2. current compensation device as claimed in claim 1, it is characterised in that described control circuit determines described OLED pixel electricity
The luminosity of the described OLED in road, including:
Described control circuit, specifically for detecting the anode voltage of described OLED, and according to the anode voltage of OLED
And the preset relation between luminosity, determines the luminosity of the described OLED that the described anode voltage detected is corresponding.
3. current compensation device as claimed in claim 1 or 2, it is characterised in that described control circuit is according to described OLED device
The luminosity of part determines the current value after the compensation flowing through described OLED, including:
Described control circuit, specifically for being calculated the electric current after the compensation flowing through described OLED by below equation
Value:
Iem=100/P*n/m*IReference；
Wherein, IemFor being calculated the current value after the compensation flowing through described OLED, P is the luminance of described OLED
Degree, n is the grey decision-making of image to be displayed, total GTG that m is supported by the OLED display device comprising described current compensation device
Value, IReferenceThe current value provided by the reference power source comprised in described control circuit.
4. current compensation device as claimed in claim 1 or 2, it is characterised in that described OLED pixel circuit includes: first is thin
Film transistor, the second thin film transistor (TFT), the 3rd thin film transistor (TFT), the 4th thin film transistor (TFT), the 5th thin film transistor (TFT), the first control
Signal input part, the second control signal input, the 3rd control signal input, the 4th control signal input, OLED,
Electric capacity, the first power supply, second source, wherein:
The grid of described the first film transistor is connected with the drain electrode of described 3rd thin film transistor (TFT), and brilliant with described 4th thin film
The source electrode of body pipe connects, and the also negative pole with described electric capacity is connected；The source electrode of described the first film transistor and described first power supply
Connect, and be connected with the positive pole of described electric capacity；The drain electrode of described the first film transistor and the source of described second thin film transistor (TFT)
Pole connects, and is connected with the source electrode of the 5th thin film transistor (TFT)；
The grid of described second thin film transistor (TFT) is connected with described first control signal input, drain electrode and described OLED
Anode connects；
The grid of described 3rd thin film transistor (TFT) is connected with described second control signal input, and source electrode is with digital to analog converter even
Connect；
The grid of described 4th thin film transistor (TFT) is connected with described 3rd control signal input, and drain electrode is with analog-digital converter even
Connect, and be connected with the drain electrode of described 5th thin film transistor (TFT)；
The grid of described 5th thin film transistor (TFT) is connected with described 4th control signal input；
The negative electrode of described OLED is connected with described second source.
5. current compensation device as claimed in claim 4, it is characterised in that described control circuit is according to described OLED
Luminosity determines the current value after the compensation flowing through described OLED, including:
Described control circuit, during specifically for determining the first film transistor cutoff described the first of described the first film transistor
Grid voltage, and determine the described second grid electricity of described the first film transistor during described the first film transistor turns
Pressure；According to described primary grid voltage, described second grid voltage, the luminosity of described OLED and described first thin
The threshold voltage of film transistor, determines the current value after the compensation flowing through described OLED.
6. current compensation device as claimed in claim 5, it is characterised in that described control circuit determines the first film transistor
The described primary grid voltage of described the first film transistor during cut-off, including:
Described control circuit, specifically for turning off when the second thin film transistor (TFT), the 3rd thin film transistor (TFT) turns off, the 4th film crystal
Pipe conducting, the 5th thin film transistor (TFT) conducting, and when the first contactor is transformed to disconnect by Guan Bi, detect described the first film brilliant
The described primary grid voltage of described the first film transistor during the cut-off of body pipe.
7. current compensation device as claimed in claim 5, it is characterised in that described control circuit determines that described the first film is brilliant
The described second grid voltage of described the first film transistor during the conducting of body pipe, including:
Described control circuit, specifically for turning off when the second thin film transistor (TFT), the 3rd thin film transistor (TFT) turns off, the 4th film crystal
Pipe conducting, the 5th thin film transistor (TFT) conducting, and during second circuit switch Guan Bi, detect described the first film transistor turns time institute
State the described second grid voltage of the first film transistor.
8. one kind utilizes the method that current compensation device described in any one of claim 1-7 realizes current compensation, it is characterised in that
Described current compensation method includes:
Determine the luminosity of OLED in Organic Light Emitting Diode OLED pixel circuit；
Luminosity according to described OLED determines the current value after the compensation flowing through described OLED；
According to flowing through the current value after the described compensation of described OLED, drive described OLED luminous.
9. an Organic Light Emitting Diode OLED display panel, it is characterised in that comprise right in described OLED display panel and want
Seek the current compensation device described in any one of 1-7.
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