CN107993612A - A kind of AMOLED pixel-driving circuits and image element driving method - Google Patents
A kind of AMOLED pixel-driving circuits and image element driving method Download PDFInfo
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- CN107993612A CN107993612A CN201711396757.7A CN201711396757A CN107993612A CN 107993612 A CN107993612 A CN 107993612A CN 201711396757 A CN201711396757 A CN 201711396757A CN 107993612 A CN107993612 A CN 107993612A
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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
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Abstract
The present invention provides a kind of AMOLED pixel-driving circuits and image element driving method, pixel-driving circuit includes the first transistor, second transistor, third transistor, the 4th transistor, the 5th transistor, the 6th transistor, the first storage capacitance, the second storage capacitance, light emitting diode, is connected with first voltage end, second voltage end, LED control signal, reset signal end, data input pin, scanning signal end, resetting voltage end；Image element driving method includes initialization step, threshold value storing step, data write step, light emitting step.AMOLED pixel-driving circuits and image element driving method provided by the invention are by the correction-compensation threshold voltage to data voltage to luminous influence, it is uneven to avoid the display that IR pressure drops are brought at the same time, improve the quality that picture is shown, and it ensure that OLED anodes are in relatively low current potential under black picture by resetting OLED, picture is avoided ghost occur, the darkness of black picture is improved at the same time, so that the picture for providing high quality is shown.
Description
Technical field
The present invention relates to the pixel driver technical field of OLED or other organic electroluminescence devices, more particularly to AMOLED
Pixel-driving circuit and image element driving method.
Background technology
With the development of social Information, the various performance requirements of field of display are being continuously increased, thus, need
Study of Thin, light and with low-power consumption various flat panel display equipments are wanted, for example, flat panel display equipment is classified as liquid crystal display
(LCD) equipment, plasma display panel (PDP) equipment, active matrix organic light-emitting diode (OLED) equipment etc..
In OLED display devices, (Active Matrix/Organic Light Emitting Diode, have AMOLED
Source matrix Organic Light Emitting Diode) because with thinner lighter, self-luminous, Low emissivity, contrast is high, fast response time and low power consuming
The advantages that, it has been widely used in panel display apparatus.In today that consumption electronic product makes rapid progress, to panel display apparatus
The requirement of high pixel number (PPI), narrow frame, uniformity, contrast equal-specification and display effect further improve, therefore
AMOLED pixel circuit and driving method are also required for lifting accordingly and improve.
One of main problem that AMOLED needs to overcome is that backboard needs low-temperature polysilicon film transistor (LTPS TFT)
Circuit drives, and the IR pressure drops (IR drop) of the uneven and power cord of the threshold value of thin film transistor (TFT) TFT can cause the color of display
Poor (Mura) or the uniform brightness of brightness disproportionation are inconsistent, and current AMOLED pixel-driving circuits cannot can be to threshold V T H
Compensated with IR pressure drop IR Drop, it is impossible to ensure the darkness of black picture, so that the picture for being difficult to provide high quality is shown.
The content of the invention
One aspect of the present invention provides a kind of AMOLED pixel-driving circuits, realizes threshold voltage compensation and IR pressure drops IR
Drop is compensated, and purpose is uniformly shown to reach panel, and effective by the replacement thin film transistor (TFT) RESET TFT that diode connects
Improve the effect of black display.
Another aspect of the present invention provides a kind of image element driving method, is easy to ensure the steady of circuit by the connection of two capacitances
Qualitative driving method, which eliminates threshold voltage shift Vth shift and IR pressure drop IR drop, to be influenced to set the voltage to OLED at the same time
Reset the darkness for helping to improve black picture.
In order to solve the above-mentioned technical problem, the technical solution used in the present invention is：
One aspect of the present invention provides a kind of AMOLED pixel-driving circuits, including the first transistor, second transistor, the 3rd
Transistor, the 4th transistor, the 5th transistor, the 6th transistor, the first storage capacitance, the second storage capacitance, light emitting diode；
The source electrode connection first voltage end of the first transistor, its grid connect the first storage capacitance as first node
First end and the second storage capacitance first end, the second end of first storage capacitance also connects the first voltage end,
The source electrode of its connection second transistor that drains；
The grid connection LED control signal of the second transistor, the anode of its connecting luminous diode that drains；
The source electrode of the third transistor is all connected with reset signal end with grid, its drain electrode also connects the light emitting diode
Anode, the cathode connection second voltage end of the light emitting diode；
The drain electrode of the source electrode connection the first transistor of 4th transistor, its grid connection reset signal end, it drains
Connect the grid of the first transistor；
The source electrode connection data input pin of 5th transistor, its grid connection scanning signal end, it, which drains, is used as the
Two nodes connect the second end of second storage capacitance and the drain electrode of the 6th transistor；
The source electrode connection resetting voltage end of 6th transistor, its grid connection reset signal end.
Further, the first transistor, second transistor, third transistor, the 4th transistor, the 5th transistor,
6th transistor is P-type TFT.
Another aspect of the present invention provides a kind of pixel driver side of the AMOLED pixel-driving circuits described in claim 1
Method, including：
Initialization step：Reset signal end, LED control signal are low level, and scanning signal end is high level, and second is brilliant
Body pipe, third transistor, the 4th transistor, the 6th transistor turns, the first transistor, the 5th transistor cutoff, resetting voltage
Terminal voltage is input to the first end of the second storage capacitance, and the low level at reset signal end is input to by the third transistor
The grid of one transistor and the anode of light emitting diode, reset the grid voltage of driving tube；
Threshold value storing step：Reset signal end is low level, and LED control signal, scanning signal end are high level, second
Transistor, third transistor, the 4th transistor, the 6th transistor are held on, and the first transistor, the 5th transistor keep cutting
Only, the first end of second storage capacitance keeps resetting voltage terminal voltage, and first voltage end passes through the first transistor, the 4th crystalline substance
Body pipe charges to the first storage capacitance and the second storage capacitance；
Data write step：Reset signal end, LED control signal are high level, and scanning signal end is low level, second
Transistor, third transistor, the 4th transistor, the 5th transistor, the 6th transistor turns, the first transistor cut-off, data are defeated
The voltage for entering end is input to the first end i.e. section point of the second storage capacitance by the 5th transistor；
Light emitting step：LED control signal is low level, and reset signal end, scanning signal end are high level, first crystal
Pipe, second transistor conducting, third transistor, the 4th transistor, the 5th transistor, the 6th transistor cutoff, light emitting diode
Into glow phase.
Further, in threshold value storing step, first voltage end is charged to the first storage capacitance and the second storage capacitance
Until the first storage capacitance and second end, that is, first node voltage of the second storage capacitance or the grid voltage of the first transistor are
VDD+VTH。
Further, in data write step, the voltage variety of the section point is VINIT-DATA；Corresponding
One node N1 voltage varieties are：
I.e. section point N2 voltages are：
Further, in light emitting step, the glow current of light emitting diode is：
AMOLED pixel-driving circuits and image element driving method provided by the invention pass through the amendment to data voltage DATA
Threshold voltage is compensated to luminous influence, while it is uneven to avoid the display that IR pressure drop IR Drop are brought, and improves picture and shows
Quality, and ensure that OLED anodes are in relatively low current potential under black picture by resetting OLED, avoid picture from occurring residual
Shadow, while the darkness of black picture is improved, so that the picture for providing high quality is shown.
Brief description of the drawings
Fig. 1 is the structure diagram of the AMOLED pixel-driving circuits of the present invention；
Fig. 2 is the corresponding drive signal time diagram of AMOLED pixel-driving circuits of Fig. 1 of the present invention.
Embodiment
Specifically illustrate embodiments of the present invention below in conjunction with the accompanying drawings, attached drawing is only for reference and explanation uses, and does not form pair
The limitation of scope of patent protection of the present invention.
Embodiment 1：
As shown in Figure 1, the present embodiment is related to a kind of AMOLED pixel-driving circuits, including the first transistor T1, the second crystalline substance
Body pipe T2, third transistor T3, the 4th transistor T4, the 5th transistor T5, the 6th transistor T6, the first storage capacitance C1,
Two storage capacitance C2, light emitting diode OLED；
The source electrode connection first voltage end VDD of the first transistor T1, its grid is as first node N1 connections first
The first end of the first end of storage capacitance C1 and the second storage capacitance C2, the second end of the first storage capacitance C1 also connect institute
First voltage end VDD is stated, the source electrode of its connection second transistor T2 that drains；
The grid connection LED control signal EM of the second transistor T2, the sun of its connecting luminous diode OLED that drains
Pole；
The source electrode of the third transistor T3 is all connected with reset signal end RESET with grid, its drain electrode also connects the hair
The anode of optical diode OLED, the cathode connection second voltage end VSS of the light emitting diode OLED；
The drain electrode of the source electrode connection the first transistor T1 of the 4th transistor T4, its grid connection reset signal end
RESET, the grid of its connection the first transistor T1 that drains；
The source electrode connection data input pin DATA of the 5th transistor T5, its grid connection scanning signal end SCAN, its
Drain electrode is as the second end of section point N2 connections the second storage capacitance C2 and the drain electrode of the 6th transistor T6；
The source electrode connection resetting voltage end VINIT of the 6th transistor T6, its grid connection reset signal end RESET.
In the present embodiment, the first transistor T1, second transistor T2, third transistor T3, the 4th transistor T4,
5th transistor T5, the 6th transistor T6 are P-type TFT.
The image element driving method of AMOLED pixel-driving circuits shown in Fig. 1 is said in conjunction with the signal sequence in Fig. 2
It is bright.
The AMOLED image element driving methods that the embodiment of the present invention is related to, including：
Initialization step：During t1 is initialized, reset signal end RESET, LED control signal EM are low level, scanning
Signal end SCAN is high level, and second transistor T2, third transistor T3, the 4th transistor T4, the 6th transistor T6 are turned on, the
One transistor T1, the 5th transistor T5 end, the first end of resetting voltage end VINIT control sources to the second storage capacitance C2,
The low level of reset signal end RESET is input to the grid and light-emitting diodes of the first transistor T1 by the third transistor T3
The anode of pipe OLED, resets the grid voltage of driving tube T1, and by resetting OLED, ghost can occur to avoid picture same
The darkness of Shi Tigao black pictures；
Threshold value storing step：During threshold value stores t2, reset signal end RESET is low level, LED control signal EM,
Scanning signal end SCAN is high level, and second transistor T2, third transistor T3, the 4th transistor T4, the 6th transistor T6 are protected
Conducting is held, the first transistor T1, the 5th transistor T5 keep cut-off, and the first end of the second storage capacitance C2 keeps resetting electricity
Pressure side VINIT voltages, first voltage end VDD is by the first transistor T1, the 4th transistor T4 to the first storage capacitance C1 and the
Two storage capacitance C2 charge, until the first storage capacitance C1 and the second storage capacitance C2 second end, that is, first node N1 voltages or
The grid voltage of the first transistor T1 is VDD+VTH, because the AMOLED pixel-driving circuits are made of p-type TFT, VTH mono-
As be negative value；
Data write step：During data write t3, reset signal end RESET, LED control signal EM are high level,
Scanning signal end SCAN is low level, second transistor T2, third transistor T3, the 4th transistor T4, the 5th transistor T5,
Six transistor T6 are turned on, the first transistor T1 cut-offs, and the voltage of data input pin DATA is input to the by the 5th transistor T5
The voltage variety of the first end of two storage capacitance C2, that is, section point N2, the section point N2 is VINIT-DATA；Accordingly
First node N1 voltage varieties be：
I.e. section point N2 voltages are：；
Light emitting step：During the t4 that shines, LED control signal EM is low level, reset signal end RESET, scanning signal
End SCAN is high level, and the first transistor T1, second transistor T2 are turned on, third transistor T3, the 4th transistor T4, the 5th crystalline substance
Body pipe T5, the 6th transistor T6 end, and light emitting diode OLED enters glow phase, the glow current of light emitting diode OLED
For：
By current formula as can be seen that compensate for the influence of threshold voltage in final shine, meanwhile, be free of in formula
It is uneven that first voltage end VDD avoids the display that IR pressure drop IR Drop are brought, and can improve the quality that picture is shown.
The AMOLED pixel-driving circuits of the present invention can pass through the correction-compensation threshold voltage pair to data voltage DATA
Luminous influence, and it is uneven to avoid the display that IR pressure drop IR Drop are brought, while the replacement to OLED can be increased
RESET ensure that OLED anodes are in relatively low current potential under black picture, avoid since the black that the factors such as TFT electric leakages are brought is drawn
Inadequate bad of face darkness.
Above disclosed is only presently preferred embodiments of the present invention, it is impossible to the rights protection model of the present invention is limited with this
Enclose, therefore the equivalent variations made according to scope of the present invention patent, it is still within the scope of the present invention.
Claims (6)
- A kind of 1. AMOLED pixel-driving circuits, it is characterised in that：Including the first transistor, second transistor, third transistor, 4th transistor, the 5th transistor, the 6th transistor, the first storage capacitance, the second storage capacitance, light emitting diode；The source electrode connection first voltage end of the first transistor, its grid as first node the first storage capacitance of connection the One end and the first end of the second storage capacitance, the second end of first storage capacitance also connect the first voltage end, it is leaked Pole connects the source electrode of second transistor；The grid connection LED control signal of the second transistor, the anode of its connecting luminous diode that drains；The source electrode of the third transistor is all connected with reset signal end with grid, it, which drains, also connects the sun of the light emitting diode Pole, the cathode connection second voltage end of the light emitting diode；The drain electrode of the source electrode connection the first transistor of 4th transistor, its grid connection reset signal end, its connection that drains The grid of the first transistor；The source electrode connection data input pin of 5th transistor, its grid connection scanning signal end, it drains as the second section Point connects the second end of second storage capacitance and the drain electrode of the 6th transistor；The source electrode connection resetting voltage end of 6th transistor, its grid connection reset signal end.
- 2. AMOLED pixel-driving circuits according to claim 1, it is characterised in that：The first transistor, second transistor, third transistor, the 4th transistor, the 5th transistor, the 6th transistor are P-type TFT.
- A kind of 3. image element driving method of the AMOLED pixel-driving circuits described in claim 1, it is characterised in that including：Initialization step：Reset signal end, LED control signal are low level, and scanning signal end is high level, second transistor, Third transistor, the 4th transistor, the 6th transistor turns, the first transistor, the 5th transistor cutoff, resetting voltage terminal voltage The first end of the second storage capacitance is input to, the low level at reset signal end is input to first crystal by the third transistor The grid of pipe and the anode of light emitting diode, reset the grid voltage of driving tube；Threshold value storing step：Reset signal end is low level, and LED control signal, scanning signal end are high level, the second crystal Pipe, third transistor, the 4th transistor, the 6th transistor are held on, and the first transistor, the 5th transistor keep cut-off, institute The first end for stating the second storage capacitance keeps resetting voltage terminal voltage, and first voltage end passes through the first transistor, the 4th transistor Charge to the first storage capacitance and the second storage capacitance；Data write step：Reset signal end, LED control signal are high level, and scanning signal end is low level, the second crystal Pipe, third transistor, the 4th transistor, the 5th transistor, the 6th transistor turns, the first transistor cut-off, data input pin Voltage the first end i.e. section point of the second storage capacitance is input to by the 5th transistor；Light emitting step：LED control signal is low level, and reset signal end, scanning signal end are high level, the first transistor, Two-transistor turns on, third transistor, the 4th transistor, the 5th transistor, the 6th transistor cutoff, and light emitting diode enters hair Photophase.
- 4. the image element driving method of AMOLED pixel-driving circuits according to claim 3, it is characterised in that：Deposited in threshold value Store up in step, first voltage end is to the first storage capacitance and the charging of the second storage capacitance until the first storage capacitance and the second storage The grid voltage of the second end of capacitance, that is, first node voltage or the first transistor is VDD+VTH.
- 5. the image element driving method of AMOLED pixel-driving circuits according to claim 4, it is characterised in that：Write in data Enter in step, the voltage variety of the section point is VINIT-DATA；First node N1 voltage varieties are accordingly：<mrow> <mfrac> <mrow> <mi>C</mi> <mn>1</mn> </mrow> <mrow> <mi>C</mi> <mn>1</mn> <mo>+</mo> <mi>C</mi> <mn>2</mn> </mrow> </mfrac> <mo>*</mo> <mrow> <mo>(</mo> <mi>V</mi> <mi>I</mi> <mi>N</mi> <mi>I</mi> <mi>T</mi> <mo>-</mo> <mi>D</mi> <mi>A</mi> <mi>T</mi> <mi>A</mi> <mo>)</mo> </mrow> <mo>;</mo> </mrow>I.e. section point N2 voltages are：<mrow> <mi>V</mi> <mi>D</mi> <mi>D</mi> <mo>+</mo> <mi>V</mi> <mi>T</mi> <mi>H</mi> <mo>-</mo> <mfrac> <mrow> <mi>C</mi> <mn>1</mn> </mrow> <mrow> <mi>C</mi> <mn>1</mn> <mo>+</mo> <mi>C</mi> <mn>2</mn> </mrow> </mfrac> <mo>*</mo> <mrow> <mo>(</mo> <mi>V</mi> <mi>I</mi> <mi>N</mi> <mi>I</mi> <mi>T</mi> <mo>-</mo> <mi>D</mi> <mi>A</mi> <mi>T</mi> <mi>A</mi> <mo>)</mo> </mrow> <mo>.</mo> </mrow>
- 6. the image element driving method of AMOLED pixel-driving circuits according to claim 5, it is characterised in that：In the step that shines In rapid, the glow current of light emitting diode is：<mrow> <mtable> <mtr> <mtd> <mrow> <mi>I</mi> <mi>O</mi> <mi>L</mi> <mi>E</mi> <mi>D</mi> <mo>=</mo> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> <mo>*</mo> <mfrac> <mi>W</mi> <mi>L</mi> </mfrac> <mo>*</mo> <mi>C</mi> <mi>o</mi> <mi>x</mi> <mo>*</mo> <msup> <mrow> <mo>(</mo> <mrow> <mi>V</mi> <mi>D</mi> <mi>D</mi> <mo>+</mo> <mi>V</mi> <mi>T</mi> <mi>H</mi> <mo>-</mo> <mfrac> <mrow> <mi>C</mi> <mn>1</mn> </mrow> <mrow> <mi>C</mi> <mn>1</mn> <mo>+</mo> <mi>C</mi> <mn>2</mn> </mrow> </mfrac> <mo>*</mo> <mrow> <mo>(</mo> <mrow> <mi>V</mi> <mi>I</mi> <mi>N</mi> <mi>I</mi> <mi>T</mi> <mo>-</mo> <mi>D</mi> <mi>A</mi> <mi>T</mi> <mi>A</mi> </mrow> <mo>)</mo> </mrow> <mo>-</mo> <mi>V</mi> <mi>D</mi> <mi>D</mi> <mo>-</mo> <mi>V</mi> <mi>T</mi> <mi>H</mi> </mrow> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>=</mo> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> <mo>*</mo> <mfrac> <mi>W</mi> <mi>L</mi> </mfrac> <mo>*</mo> <mi>C</mi> <mi>o</mi> <mi>x</mi> <mo>*</mo> <msup> <mrow> <mo>(</mo> <mrow> <mfrac> <mrow> <mi>C</mi> <mn>1</mn> </mrow> <mrow> <mi>C</mi> <mn>1</mn> <mo>+</mo> <mi>C</mi> <mn>2</mn> </mrow> </mfrac> <mo>*</mo> <mrow> <mo>(</mo> <mrow> <mi>V</mi> <mi>I</mi> <mi>N</mi> <mi>I</mi> <mi>T</mi> <mo>-</mo> <mi>D</mi> <mi>A</mi> <mi>T</mi> <mi>A</mi> </mrow> <mo>)</mo> </mrow> </mrow> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mrow> </mtd> </mtr> </mtable> <mo>.</mo> </mrow>
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