CN108630147A - Active matrix/organic light emitting display and its driving method - Google Patents
Active matrix/organic light emitting display and its driving method Download PDFInfo
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- CN108630147A CN108630147A CN201710161639.1A CN201710161639A CN108630147A CN 108630147 A CN108630147 A CN 108630147A CN 201710161639 A CN201710161639 A CN 201710161639A CN 108630147 A CN108630147 A CN 108630147A
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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]
- G09G3/3225—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] using an active matrix
- G09G3/3233—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] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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Abstract
The present invention provides a kind of active matrix/organic light emitting display and its driving methods, wherein active matrix/organic light emitting display includes：Pel array, multiple data lines and driving chip, each pixel unit of pel array is including Organic Light Emitting Diode and the pixel circuit being connect with Organic Light Emitting Diode, pixel circuit includes a driving transistor, driving chip detects the threshold voltage of each driving transistor by multiple data lines, and the data-signal after providing valve value compensation to each pixel unit of pel array according to threshold voltage.In active matrix/organic light emitting display provided by the invention and its driving method, the threshold voltage of driving transistor is detected by driving chip, and valve value compensation is carried out to data-signal according to threshold voltage, thus the brightness disproportionation caused by threshold voltage deviation is avoided, the number of transistors of pixel circuit is reduced simultaneously, therefore it can realize higher pixel density, improve the resolution ratio of active matrix/organic light emitting display.
Description
Technical field
The present invention relates to technical field of flat panel display, more particularly to a kind of active matrix/organic light emitting display and its driving
Method.
Background technology
Organic light emitting display (full name in English Organic Lighting Emitting Display, abbreviation OLED) is
A kind of active luminescent device compares present mainstream flat panel display Thin Film Transistor-LCD (full name in English Thin
Film Transistor liquid crystal display, abbreviation TFT-LCD), OLED have high contrast, wide viewing angle,
The advantages that low-power consumption, thinner volume, is expected to become the next-generation flat panel display after TFT-LCD, is that current tablet is aobvious
Show most one of technology that attracts attention in technology.
According to the difference of type of drive, organic light emitting display is divided into passive-matrix organic light emitting display (full name in English
Passive Matrix Organic Lighting Emitting Display, abbreviation PMOLED) and the organic hair of active-matrix
Optical display unit (full name in English Active Matrix Organic Lighting Emitting Display, abbreviation AMOLED),
Active matrix organic light-emitting display is also referred to as active matrix/organic light emitting display.Active matrix/organic light emitting display includes
The pel array that scan line, data line and the scan line and data line are defined, each pixel of the pel array
Unit includes that Organic Light Emitting Diode (also referred to as OLED device) and pixel circuit, the Organic Light Emitting Diode are incorporated in first
Between power supply and second source, the pixel circuit is incorporated between the first power supply and Organic Light Emitting Diode, to control supply
To the driving current of the Organic Light Emitting Diode.
With the development of display technology, demand of the user to display resolution is higher and higher.Every English may be used in resolution ratio
Very little pixel number (pixels per inch, abbreviation PPI) is weighed.According to displaying principle it is found that each pixel list of pel array
Member is required for being driven using pixel circuit and then be shone.Therefore, in order to improve pixel resolution, in addition to needing in unit area
It is interior to accommodate outside more OLED device, it is also desirable to accommodate more pixel circuit.
However, due to being limited by currently manufactured technique, the OLED device and pixel circuit base that are accommodated in unit area
Can not it increase in sheet, therefore the resolution ratio of existing active matrix/organic light emitting display is difficult to improve.
Base this, how to solve the problems, such as that the resolution ratio of existing active matrix/organic light emitting display is difficult to improve, Cheng Liao
Those skilled in the art's technical problem urgently to be resolved hurrily.
Invention content
The purpose of the present invention is to provide a kind of active matrix/organic light emitting display and its driving methods, existing to solve
The resolution ratio of active matrix/organic light emitting display the problem of being difficult to improve.
To solve the above problems, the present invention provides a kind of active matrix/organic light emitting display, the active matrix is organic
Active display includes：Each pixel unit of pel array, multiple data lines and driving chip, the pel array includes
Organic Light Emitting Diode and the pixel circuit being connect with the Organic Light Emitting Diode, the pixel circuit include that a driving is brilliant
Body pipe, the driving chip detect the threshold voltage of each driving transistor by the multiple data lines, and according to the threshold
Threshold voltage to each pixel unit of the pel array provide valve value compensation after data-signal.
Optionally, in the active matrix/organic light emitting display, the pixel circuit includes：The first transistor,
It is connected between data line and first node, grid is connected to the first scan line；Second transistor, be connected to the first power supply with
Between second node, grid is connected to first node；Third transistor is connected between first node and second node,
Grid is connected to the second scan line；4th transistor is connected between second node and the anode of Organic Light Emitting Diode, grid
Pole is connected to control line；Storage capacitance, both ends are connect with the first power supply with first node respectively.
Optionally, in the active matrix/organic light emitting display, the cathode of the Organic Light Emitting Diode and
Two power supplys connect, the driving power of first power supply and second source as the Organic Light Emitting Diode.
Optionally, in the active matrix/organic light emitting display, the on and off of the first transistor is equal
The the first scanning signal control provided by the first scan line, the on and off of the second transistor by first node electricity
Position control, the second scanning signal control that the on and off of the third transistor is provided by the second scan line, described the
The on and off of four transistors is controlled by the control signal that control line provides.
Optionally, in the active matrix/organic light emitting display, the driving chip includes：Data-signal generates
Unit, threshold computation unit and threshold compensation unit；The data-signal generates unit for generating data-signal；The threshold value
Computing unit is used to detect the grid voltage of the driving transistor, and the grid voltage and the first supply voltage are compared
Compared with to obtain the threshold voltage of driving transistor；The threshold compensation unit is used for according to the threshold voltage to data-signal
Valve value compensation is carried out, the data-signal after valve value compensation is obtained.
Optionally, in the active matrix/organic light emitting display, the driving transistor is second transistor, institute
It states driving transistor and is provided to data voltage and the first electricity that the driving current of the Organic Light Emitting Diode is provided by data line
The threshold value electricity for the second source voltage and second transistor that the first supply voltage that source provides is determined, and provided with second source
It presses unrelated.
Optionally, in the active matrix/organic light emitting display, the first transistor is equal to the 4th transistor
For thin film transistor (TFT).
Correspondingly, the present invention also provides a kind of driving method of active matrix/organic light emitting display, the active square
Battle array organic light emitting display driving method include：
Scan period includes first time period, second time period and third period, wherein
In first time period, the 4th transistor is closed while opening the first transistor and third transistor, in the second crystalline substance
Body pipe is detected the threshold voltage of the second transistor after reaching balance, and exports threshold value according to the threshold voltage and mend
Data-signal after repaying；
In second time period, second transistor is closed while opening the first transistor to the 4th transistor, threshold value is mended
First node is written in data-signal after repaying；
In the third period, the first transistor and third crystal are closed while opening second transistor and four transistors
Pipe, second transistor output current simultaneously drive the organic light-emitting diode.
Optionally, in the driving method of the active matrix/organic light emitting display, to the second transistor
The process that threshold voltage is detected includes：
The grid voltage of the second transistor is detected by data line；
And the grid voltage of the second transistor is compared with the first supply voltage by threshold computation unit,
Obtain the threshold voltage of the second transistor.
Optionally, in the driving method of the active matrix/organic light emitting display, in first time period, described
After two-transistor reaches balance, the grid voltage of the second transistor is equal to Vdd- | Vth |；Wherein, Vdd is that the first power supply carries
The first supply voltage supplied, Vth are the threshold voltage of the second transistor.
In active matrix/organic light emitting display provided by the invention and its driving method, is detected and driven by driving chip
The threshold voltage of dynamic transistor, and valve value compensation is carried out to data-signal according to the threshold voltage, it thus avoids because of threshold value electricity
Brightness disproportionation caused by deviation is pressed, while the number of transistors of pixel circuit is reduced, therefore can realize higher pixel
Density improves the resolution ratio of the active matrix/organic light emitting display.
Description of the drawings
Fig. 1 is the structural schematic diagram of the active matrix/organic light emitting display of the embodiment of the present invention.
Fig. 2 is the structural schematic diagram of the pixel unit of the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the driving chip of the embodiment of the present invention；
Fig. 4 is the sequence diagram of the driving method of the active matrix/organic light emitting display of the embodiment of the present invention.
Specific implementation mode
Below in conjunction with the drawings and specific embodiments to a kind of active matrix/organic light emitting display proposed by the present invention and its
Driving method is described in further detail.According to following explanation and claims, advantages and features of the invention will become apparent from.
It should be noted that attached drawing is all made of very simplified form and uses non-accurate ratio, only to it is convenient, lucidly assist
Illustrate the purpose of the embodiment of the present invention.
Incorporated by reference to reference to figure 1 and Fig. 2, being the structural representation of the active matrix/organic light emitting display of the embodiment of the present invention
Figure.As depicted in figs. 1 and 2, the active matrix/organic light emitting display 100 includes：Pel array 110, multiple data lines
Data and driving chip 120, each pixel unit 111 of the pel array 110 include Organic Light Emitting Diode OLED with
And the pixel circuit 10 being connect with the Organic Light Emitting Diode OLED, the pixel circuit 10 include a driving transistor T2,
The driving chip 120 detects the threshold voltage of each driving transistor T2 by the multiple data lines Data, and according to institute
State the data-signal after threshold voltage provides valve value compensation to each pixel unit of the pel array 110.
Specifically, as shown in Fig. 2, each pixel unit 111 include Organic Light Emitting Diode OLED and with institute
The pixel circuit 10 of Organic Light Emitting Diode OLED connections is stated, the pixel circuit 10 includes：The first transistor T1, is connected to number
According between line Data and first node A, grid is connected to the first scan line Sn-1；Second transistor T2 is connected to the first electricity
Between source ELVDD and second node B, grid is connected to first node A；Third transistor T3 is connected to first node A and
Between two node B, grid is connected to the second scan line Sn；4th transistor T4 is connected to second node B and organic light emission two
Between the anode of pole pipe OLED, grid is connected to control line EM；Storage capacitance C, both ends respectively with the first power supply ELVDD and
One node A connections.
Wherein, the pixel circuit 10 is connect with Organic Light Emitting Diode OLED, for driving the organic light-emitting diodes
Pipe OLED shines.As shown in Fig. 2, the anode of the Organic Light Emitting Diode OLED is connect with the pixel circuit 10, it is described to have
The cathode of machine light emitting diode OLED is connect with second source ELVSS, and the first power supply ELVDD and second source ELVSS are used
Make the driving power of Organic Light Emitting Diode OLED, the first power supply ELVDD is described for the first supply voltage of offer Vdd
Second source ELVSS is for providing second source voltage Vss.In the present embodiment, the first power supply ELVDD is high power supply electricity
It is low supply voltage signal or ground terminal to press signal, the second source ELVSS.It should be understood that high and low only expression input here
Voltage between relative size relationship.The first power supply ELVDD and second source ELVSS can pass through external timing control
Device provides.
With continued reference to FIG. 2, the on and off of the first transistor T1 is by the first of the first scan line Sn-1 offers
Scanning signal controls, and the on and off of the second transistor T2 is by the control of Electric potentials of first node A, the third transistor
The on and off of T3 is controlled by the second scanning signal that the second scan line Sn is provided, and the conducting of the 4th transistor T4 and is cut
Only controlled by the control signal that control line EM is provided.
When the first scanning signal that the first scan line Sn-1 is provided transits to low level, the first transistor T1
Conducting, when the first scanning signal that the first scan line Sn-1 is provided transits to high level, the first transistor T1 is cut
Only.When the second scanning signal that the second scan line Sn is provided transits to low level, the third transistor T3 conductings, when
When the second scanning signal that the second scan line Sn is provided transits to high level, the third transistor T3 cut-offs.When described
When the control signal transition that control line EM is provided is to low level, the 4th transistor T4 conductings, when the control line EM is provided
Control signal transition to high level when, the 4th transistor T4 cut-off.
With continued reference to FIG. 2, the pixel circuit 10 is a kind of 4T1C types circuit structure, including 4 transistors and 1 electricity
Container.Wherein, driving transistors of the second transistor T2 as pixel, carries corresponding to the current potential of first node A to control
It is supplied to the driving current of Organic Light Emitting Diode OLED, the Organic Light Emitting Diode OLED is sent out pair according to the driving current
The light for answering brightness, to show image.
Preferably, the first transistor T1 to the 4th transistor T4 is thin film transistor (TFT).The first transistor T1
P-type TFT can be selected to the 4th transistor T4, N-type TFT can also be selected.Well known, p-type film is brilliant
Body pipe is connected when grid signal is low level bit, and N-type TFT is connected when grid signal is high level position.Therefore,
As long as by the transistor types of selection and electric conduction non-colinear position.In addition, the first transistor T1 is to the 4th transistor
T4 can be low temperature polycrystalline silicon (LTPS) thin film transistor (TFT) or oxide semiconductor thin-film transistor.When using P-type transistor
LTPS thin film transistor (TFT)s are typically used, are typically to use oxide semiconductor thin-film transistor when using N-type transistor, when
The N-type transistor of low temperature polycrystalline silicon can also so be used.
In the present embodiment, the first transistor T1 to the 4th transistor T4 is P-type TFT.In addition, according to
Transistor in above-mentioned pixel circuit can be divided into enhancement transistor and depletion type crystal by the difference of transistor conductivity mode
Pipe, following embodiment are by using the explanation carried out for p-type enhancement transistor.
Referring to FIG. 3, its structural schematic diagram for the driving chip of the embodiment of the present invention.As shown in figure 3, the driving core
Piece 120 includes that data-signal generates unit 121, threshold computation unit 123 and threshold compensation unit 125, the data-signal production
Raw unit 121 is used to detect the voltage V1 of first node A for generating data-signal Vdata, the threshold computation unit 123
(i.e. the grid voltage of second transistor T2), and (i.e. the grid of second transistor T2 is electric by the voltage V1 of the first node A
Pressure) it is compared with the first supply voltage Vdd, the threshold voltage of driving transistor is obtained, the threshold compensation unit 125 is used for
Valve value compensation is carried out to data-signal Vdata according to the threshold voltage, obtains the data-signal Vdata- after valve value compensation |
Vth|。
In the present embodiment, the driving chip 120 is not only able to detect voltage V1 (the i.e. second crystalline substances of the first node A
The grid voltage of body pipe T2), the voltage V1 of the first node A that the driving chip 120 is detected be (i.e. second transistor T2's
Grid voltage) it is compared with the first supply voltage Vdd, the threshold voltage vt h of driving transistor is obtained, and can be according to institute
It states threshold voltage vt h and valve value compensation is carried out to data-signal Vdata, the number after exporting valve value compensation to the pel array 110
It is believed that number Vdata- | Vth |.
In the present embodiment, the data line Data serves not only as data line, the data-signal after propagation threshold compensation
Vdata- | Vth |, and as the feedback cabling of the voltage V1 of first node A (i.e. the grid voltage of second transistor T2), institute
State voltage V1 (the i.e. grid electricity of second transistor T2 that driving chip 120 measures the first node A by the feedback cabling
Pressure).
In the present embodiment, since the data-signal of the driving chip 120 output to the pel array 110 is that threshold value is mended
Data-signal Vdata- after repaying | Vth |, therefore it is provided to the driving current and the second crystalline substance of the Organic Light Emitting Diode OLED
The threshold voltage vt h of body pipe T2 is unrelated.Simultaneously as driving of the active matrix/organic light emitting display 100 outside
Chip repays the threshold voltage of driving transistor, therefore without separately setting transistor to driving crystal in the pixel circuit 10
The threshold voltage of pipe is repaid, and the number of transistors of the pixel circuit 10 is than the existing pixel using internal compensation mode
The number of transistors of circuit will be lacked.
Correspondingly, the present invention also provides a kind of driving methods of active matrix/organic light emitting display.Incorporated by reference to reference
The driving method of Fig. 1 to Fig. 4, the active matrix/organic light emitting display includes：
Scan period includes first time period t1, second time period t2 and third time period t 3；Wherein,
In first time period t1, the 4th transistor T4 is closed while opening the first transistor T1 and third transistor T3,
The threshold voltage vt h of the second transistor T2 is detected after second transistor T2 reaches balance, and according to the threshold
Data-signal Vdata- after threshold voltage Vth output valve value compensations | Vth |；
In second time period t2, second transistor T2 to the 4th transistor T4 is closed while opening the first transistor T1,
By the data-signal Vdata- after valve value compensation | Vth | write-in first node A；
In third time period t 3, closed while opening second transistor T2 and the 4th transistor T4 the first transistor T1 and
Third transistor T3, second transistor T2 output currents simultaneously drive the organic light-emitting diode.
Specifically, as shown in figure 4, the scan period of the active matrix/organic light emitting display includes first time period
T1, second time period t2 and third time period t 3.
In first time period t1, due to the first scan line Sn-1 the first scanning signals provided and second scanning
The second scanning signal that line Sn is provided is low level, therefore the first transistor T1 and third transistor T3 are connected.It is described
When the first transistor T1 and third transistor T3 are connected, the second transistor T2 is in similar diode operation state.Institute
State after second transistor T2 reaches balance, the voltage (i.e. the grid voltage of second transistor T2) of first node A is equal to Vdd- |
Vth |, wherein Vth is the threshold voltage of the second transistor T2.
At this point, being detected to the threshold voltage vt h of the second transistor T2 by the driving chip 120.Detection
Process includes：First, voltage V1 (the i.e. grid electricity of second transistor T2 of the first node A is detected by data line Data
Pressure)；Then；By threshold computation unit 123 to the voltage V1 (i.e. the grid voltage of second transistor T2) of the first node A
It is compared with the first supply voltage Vdd, obtains the threshold voltage vt h of the second transistor T2.
The voltage of the first node A feeds back to driving chip 120 by data line Data, the driving chip 120
The voltage of the first node A is compared by threshold computation unit 123 with the first supply voltage Vdd, obtains each drive of line n
The threshold voltage vt h of dynamic transistor.
At the same time, line n digital signal is converted into mould by the data-signal generating unit 121 of the driving chip 120
Quasi- signal (i.e. data-signal Vdata), the threshold compensation unit 125 of the driving chip 120 is according to h pairs of the threshold voltage vt
Data-signal Vdata carries out valve value compensation, and exports the data-signal Vdata- after valve value compensation | Vth |.
In second time period t 2, since the second scan line Sn the second scanning signals provided become high from low level
Level, the third transistor T3 become ending from being connected.Simultaneously as the first scanning that the first scan line Sn-1 is provided
Signal keeps low level, therefore the first transistor T1 is tended to remain on, the data-signal Vdata- after valve value compensation |
Vth | via the first transistor T1 write-in first node A (i.e. the lower substrate of storage capacitance C).
In first time period t 1 and second time period t 2, since the control line EM control signals provided remain
High level, therefore the 4th transistor T4 always remains as cut-off state during this period.
In third time period t 3, since the control line EM control signals provided become low level from high level,
The 4th transistor T4 becomes being connected from ending.At this point, the driving current of second transistor T2 outputs is along the first power supply ELVDD
Path through second transistor T2, the 4th transistor T4 and Organic Light Emitting Diode OLED flows to second source ELVSS, causes to have
Machine light emitting diode OLED lights luminous.
Since the source voltage of second transistor T2 is equal to Vdd, the grid voltage of second transistor T2 is equal to first node
The voltage of N1, i.e., the data-signal Vdata- after valve value compensation | Vth |, therefore gate source voltage Vgs (the i.e. institutes of second transistor T2
State the voltage difference between the grid and source electrode of second transistor T2) calculation formula be：
Vgs=Vdd- (Vdata- | Vth |) formula 1；
And the calculation formula for flowing through the electric current Ion of the Organic Light Emitting Diode OLED is：
Ion=K × (Vgs-Vth)2Formula 2；
Wherein, K is electron mobility, breadth length ratio, the product of unit-area capacitance three of thin film transistor (TFT).
It can be obtained according to formula 1 and formula 2：
Ion=K × (Vdd-Vdata)2Formula 3；
Expression formula based on formula 3 it is found that flow through the electric current Ion of the Organic Light Emitting Diode OLED only with the first power supply
Voltage Vdd, data voltage Vdata and constant K are related, with second source voltage Vss, second transistor T2 threshold voltage all
It is not related.It, all will not be to flowing through the Organic Light Emitting Diode even if deviation occurs in the threshold voltage of second transistor T2
The electric current Ion of OLED is impacted.
Using the active matrix/organic light emitting display and its driving method, it is not only able to avoid because of driving transistor
Brightness disproportionation caused by threshold voltage deviation, and each pixel circuit 10 only has 4 transistors and 1 capacitor, crystal
Pipe negligible amounts, therefore can realize higher pixel density, to improve resolution ratio.With existing active matrix organic light-emitting
Display is compared, and the active matrix/organic light emitting display 100 has good brightness uniformity and higher resolution
Rate.
To sum up, in active matrix/organic light emitting display provided by the invention and its driving method, pass through driving chip
Detect driving transistor threshold voltage, and according to the threshold voltage to data-signal carry out valve value compensation, thus avoid because
Brightness disproportionation caused by threshold voltage deviation, while the number of transistors of pixel circuit is reduced, therefore can realize higher
Pixel density, improve the resolution ratio of the active matrix/organic light emitting display.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Range.
Claims (10)
1. a kind of active matrix/organic light emitting display, which is characterized in that including：Pel array, multiple data lines and driving core
Each pixel unit of piece, the pel array includes Organic Light Emitting Diode and is connect with the Organic Light Emitting Diode
Pixel circuit, the pixel circuit includes a driving transistor, and the driving chip is detected each by the multiple data lines
The threshold voltage of a driving transistor, and according to the threshold voltage threshold value is provided to each pixel unit of the pel array
Data-signal after compensation.
2. active matrix/organic light emitting display as described in claim 1, which is characterized in that the pixel circuit includes：The
One transistor, is connected between data line and first node, and grid is connected to the first scan line；Second transistor is connected to
Between first power supply and second node, grid is connected to first node；Third transistor is connected to first node and the second section
Between point, grid is connected to the second scan line；4th transistor is connected to the anode of second node and Organic Light Emitting Diode
Between, grid is connected to control line；Storage capacitance, both ends are connect with the first power supply with first node respectively.
3. active matrix/organic light emitting display as claimed in claim 2, which is characterized in that the Organic Light Emitting Diode
Cathode is connect with second source, the driving power of first power supply and second source as the Organic Light Emitting Diode.
4. active matrix/organic light emitting display as claimed in claim 2, which is characterized in that the conducting of the first transistor
It is controlled by the first scanning signal that the first scan line provides with cut-off, the on and off of the second transistor is by first
The control of Electric potentials of node, the second scanning signal control that the on and off of the third transistor is provided by the second scan line
The on and off of system, the 4th transistor is controlled by the control signal that control line provides.
5. active matrix/organic light emitting display as described in claim 1, which is characterized in that the driving chip includes：Number
According to signal generation unit, threshold computation unit and threshold compensation unit；The data-signal generates unit for generating data letter
Number；The threshold computation unit is used to detect the grid voltage of the driving transistor, and the grid voltage and first is electric
Source voltage is compared, to obtain the threshold voltage of driving transistor；The threshold compensation unit is used for according to threshold value electricity
Pressure carries out valve value compensation to data-signal, obtains the data-signal after valve value compensation.
6. active matrix/organic light emitting display as described in claim 1, which is characterized in that the driving transistor is second
Transistor, the driving transistor are provided to the data voltage that the driving current of the Organic Light Emitting Diode is provided by data line
The second source voltage and second transistor for determining with the first supply voltage that the first power supply provides, and being provided with second source
Threshold voltage it is unrelated.
7. active matrix/organic light emitting display as described in claim 1, which is characterized in that the first transistor to the 4th
Transistor is thin film transistor (TFT).
8. a kind of driving method of active matrix/organic light emitting display, which is characterized in that the scan period include first time period,
Second time period and third period, wherein
In first time period, the 4th transistor is closed while opening the first transistor and third transistor, in second transistor
Reach balance after the threshold voltage of the second transistor is detected, and according to the threshold voltage export valve value compensation after
Data-signal；
In second time period, second transistor is closed while opening the first transistor to the 4th transistor, after valve value compensation
Data-signal be written first node；
In the third period, the first transistor and third transistor are closed while opening second transistor and four transistors,
Second transistor output current simultaneously drives the organic light-emitting diode.
9. the driving method of active matrix/organic light emitting display as claimed in claim 8, which is characterized in that described second
The process that the threshold voltage of transistor is detected includes：
The grid voltage of the second transistor is detected by data line；
And the grid voltage of the second transistor is compared with the first supply voltage by threshold computation unit, it obtains
The threshold voltage of the second transistor.
10. the driving method of active matrix/organic light emitting display as claimed in claim 8, which is characterized in that at first
Between section, after the second transistor reaches balance, the grid voltage of the second transistor is equal to Vdd- | Vth |；Wherein, Vdd
It is the first supply voltage that the first power supply provides, Vth is the threshold voltage of the second transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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