CN107909967A - A kind of driving method and drive circuit of optional driving tube working region - Google Patents
A kind of driving method and drive circuit of optional driving tube working region Download PDFInfo
- Publication number
- CN107909967A CN107909967A CN201711305297.2A CN201711305297A CN107909967A CN 107909967 A CN107909967 A CN 107909967A CN 201711305297 A CN201711305297 A CN 201711305297A CN 107909967 A CN107909967 A CN 107909967A
- Authority
- CN
- China
- Prior art keywords
- switch
- driving tube
- driving
- drive circuit
- closed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- 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
-
- 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]
Abstract
The invention discloses a kind of driving method and drive circuit of optional driving tube working region, using the time length that luminescent device shines in increase by one frame of switch-mode regulation in active pixel drive circuit, on the premise of ensureing that required luminosity is constant, so as to fulfill required driving tube current work regional extent between I2 I4, the brightness homogeneity of the luminescent device in display is improved, optimizes display effect.
Description
Technical field
The present invention relates to a kind of display methods and drive circuit, more particularly, to a kind of optional driving tube working region
Driving method and a kind of drive circuit of optional driving tube working region.
Background technology
The display device that OLED, LED, QLED, Micro-OLED/LED etc. actively shine is made of pel array, each
Pixel includes several sub-pixels, common are RGB system and RGBW system.In RGB system, each pixel includes a red
Sub-pixel, a green sub-pixels, a blue subpixels；In RGBW system, each pixel includes red sub-pixel, one
A green sub-pixels, a blue subpixels and a white sub-pixels.The brightness of effective control each sub-pixel of pixel unit
Required color to be shown is realized with this.
Different from liquid crystal display (LCD), autonomous active display has the advantages that slimming, high brightness, high contrast
And it is increasingly becoming mainstream display application.Autonomous luminescent device is mainly controlled by active matrix, and active matrix usually makes
On semiconductor substrate or glass.In conventional active matrix organic LED pixel-driving circuit (2T1C) structure, hair
Optical device carries out constant current driving by driving transistor.As shown in Figure 1, since in mos plumbers skill or TFT techniques, there are ripple
Dynamic, the characteristic of different driving transistor is inconsistent, some I_V curve characteristic differences can be produced in use, cause driving current
Inconsistent, especially small area analysis region is worse (when galvanic areas scope is I1-I2), so that cause the uniformity of display poor,
The corresponding low grayscale homogeneity of low current is worse, causes whole display homogeneity to decline, and display effect reduces.In existing hair
In bright, there is the image element circuit structure of compensation threshold voltage shift, but usually require many transistors and build circuit and more multiple
Miscellaneous external signal type of drive, is unfavorable for the making of high PPI displays.
The content of the invention
It should be appreciated by those skilled in the art active display is under same display brightness, in order to be brought to human eye
Overall brightness effects are constant, and fluorescent lifetime is fewer in a frame, and required luminosity is bigger, that is, require driving glow current to get over
Greatly, fluorescent lifetime is longer in a frame, and required luminosity is smaller, that is, requires driving glow current smaller.
In order to solve the problems of in the prior art, the present invention first purpose in this is to provide a kind of may be selected
The driving method of driving tube working region, the time length that this method is shone using a frame is adjusted, to adjust required luminance
Degree, so as to select the size of current of required driving tube (i.e. the working region of driving tube), realize using regulating time come
The purpose of driving tube operation interval is selected, so as to reject the inconsistent working region of driving tube characteristic with regulating time method,
Reject driving tube small area analysis region.
This method is suitable for self light emitting and the equipment such as OLED/LED, QLED, Micro-OLED/LED.
To realize first purpose of the present invention, in a kind of driving side for optional driving tube working region that this is provided
Method, it is characterised in that：Grown using the time that luminescent device shines in one frame of switch-mode regulation is increased in active pixel drive circuit
It is short, on the premise of ensureing that required luminosity is constant, so as to fulfill required driving tube current work regional extent in I2-
Between I4.
Further, wherein, the active pixel drive circuit includes basic model image element circuit, external compensation type image element circuit
Or internal compensation type image element circuit, the output terminal and/or power supply for switching the driving tube for being arranged on active pixel drive circuit
End, the switch are arranged to p-type metal-oxide-semiconductor, N-type metal-oxide-semiconductor or transmission gate, and the driving tube includes p-type metal-oxide-semiconductor or N-type MOS
Pipe.
Further, wherein, take in the time that luminescent device shines in one frame of switch-mode regulation and switched with every row
A kind of optional technical solution, wherein, the active pixel drive circuit is arranged to basic model image element circuit, the switch
The output terminal of the driving tube of active pixel drive circuit is arranged on, the driving tube uses N-type metal-oxide-semiconductor, the switch-mode regulation one
The time that luminescent device shines in frame is taken to be switched to roll with every row and closed (i.e. open position is kept), and the switch includes second and opens
Close, work comprises the following steps that in one frame：
Step 1：The T1 times write data, in a frame one's own profession start, Em signals control second switch close, G-signal control first
Switch is opened, and controls analog voltage data writing storage capacitor；
Step 2：The T2 times shine, and Em signals control second switch S2 closures, G-signal control first switch S1 is closed, energy storage electricity
Holding driving driving tube makes luminescent device shine；
Step 3：The T3 times close, and Em signals control second switch is closed, and G-signal control first switch is closed, at luminescent device
In closed mode；
Step 4：Circulation step 2- steps 3, often row, which rolls, closes the T3 times (i.e. open position is kept).
Another optional technical solution, wherein, the active pixel drive circuit is arranged to external compensation type pixel electricity
Road, the switch include second switch and the 3rd switch, and the second switch is arranged on the driving tube of active pixel drive circuit
Output terminal, the 3rd switch is arranged on the power end of the driving tube of active pixel drive circuit, and the driving tube uses p-type
Metal-oxide-semiconductor, the time that luminescent device shines in one frame of switch-mode regulation are taken in a manner of every row switchs and rolls closing, in one frame
Work comprises the following steps that：
Step 1：The T0 times eliminate threshold voltage, and G-signal control first switch, the 4th switch are opened, and Em signals control second is opened
Close, the 3rd switch unlatching, display screen external reference current feeds driving tube by data signal line, calculates each pixel
The semiconductor process parameter of driving tube simultaneously corrects display data voltage.
Step 2：The T1 times write data, and G-signal control first switch, the 4th switch are opened, and Em signals control second is opened
Close and the 3rd switch is closed, be stored in by the display data voltage after correction, and by data voltage in storage capacitor until next
Frame display data arrives；
Step 3：The T2 times shine, and G-signal control first switch, the 4th switch are closed, Em signals control second switch and the 3rd
Switch is opened, and luminescent device is in luminance；
Step 4：The T3 times close, and G-signal control first switch and the 4th switch are closed, Em signals control second switch and the 3rd
Switch is closed, and LED control signal pulse is opened, and luminescent device is closed.
The present invention second purpose in this is to provide a kind of drive circuit of optional driving tube working region, its feature
It is, the drive circuit is used to be included in active pixel drive circuit：Basic model image element circuit, external compensation type image element circuit
Or internal compensation type image element circuit；The output terminal and/or power end of the driving tube of the active pixel drive circuit set switch,
The switch is arranged to p-type metal-oxide-semiconductor, N-type metal-oxide-semiconductor or transmission gate, and the driving tube includes p-type metal-oxide-semiconductor or N-type metal-oxide-semiconductor.
Further, wherein, the driving type of the internal compensation type image element circuit includes voltage driven type and electric current drives
Type.
The driving method and drive circuit of a kind of optional driving tube working region provided by the present invention, make driving tube
Driving current is operated in certain interval range, this electric current section has higher homogeneity, improves shining in display
The brightness homogeneity of device, optimizes display effect.
Brief description of the drawings
Fig. 1 is the I_V songs that EM is always on driving tube in a frame picture in a kind of common OLED/LED image element circuits
Line；
Fig. 2 adds EM Signal-controlled switch schematic diagrams for a kind of N-type basic model image element circuit；
Fig. 3 is the drive circuit works sequence diagram shown in Fig. 2；
Fig. 4 is the drive circuit and working timing figure shown in Fig. 2；
Fig. 5 is the I_V curves of the corresponding driving tube of circuit shown in Fig. 2；
Fig. 6 adds EM Signal-controlled switch schematic diagrams for a kind of exterior p-type compensation pixel circuit；
Fig. 7 is the drive circuit works sequence diagram shown in Fig. 6；
Fig. 8 is the schematic diagram that a kind of p-type internal compensation current type image element circuit adds EM Signal-controlled switches；
Fig. 9 is the schematic diagram that a kind of p-type internal compensation voltage-type image element circuit adds EM Signal-controlled switches.
Embodiment
The technical solution of protection of the presently claimed invention is described in further detail with reference to attached drawing herein.
It should be appreciated by those skilled in the art active display is under same display brightness, in order to be brought to human eye
Overall brightness effects are constant, and fluorescent lifetime is fewer in a frame, and required luminosity is bigger, that is, require driving glow current to get over
Greatly, fluorescent lifetime is longer in a frame, and required luminosity is smaller, that is, requires driving glow current smaller.
The application technical solution claimed includes a kind of driving method and one of optional driving tube working region
The drive circuit of the optional driving tube working region of kind.Separately below for example, active pixel drive circuit common electricity
Lu Zhongru：Basic model image element circuit, the embodiment of the present invention of arranging in pairs or groups, can reach and show homogeneous effect, lift PPI；Mend outside
Repay type image element circuit or internal compensation type image element circuit is arranged in pairs or groups the embodiment of the present invention, then can further improve the effect of compensation
Fruit, further such that display is more uniform.It should be appreciated by those skilled in the art the embodiment of the present invention is mainly for more preferable
The understanding present invention, but be not limited to following embodiments.
Wherein plant the including but not limited to following several structures of drive circuit that driving tube working region may be selected：
The first structure：The image element circuit collocation this patent of basic model, in the case where not using compensation pixel, can reach aobvious
Show homogeneity, due to no complicated compensation circuit, PPI can be lifted.Basic model image element circuit divides according to the type of driving tube
For p-type metal-oxide-semiconductor and N-type metal-oxide-semiconductor, its operating principle is identical, herein without tough state, only using N-type metal-oxide-semiconductor as example explanation.N-type is driven
The basic model image element circuit of dynamic pipe adds the drive circuit of EM Signal-controlled switches, its circuit diagram is as shown in Figure 2：
The circuit structure includes first switch S1, storage capacitor C1, second switch S2, driving tube M1, wherein first switch S1's
One end as valid data (the transformed analog voltage signal Vdt of gamma) input terminal, the other end respectively with storage capacitor C1 and
One end of driving tube M1 intersects at A points；The other end connection circuit reference voltage Vref of storage capacitor C1, the power supply of driving tube M1
The other end of termination activities voltage Vdd, driving tube M1 have as the output terminal of whole drive circuit by second switch S2 connections
The luminescent device (light emitting diode) of body.Second switch S2 is set to be used to connect or close in the output end position 2 of driving tube M1
The output terminal and luminescent device of driving tube M1, individually or simultaneously can also set the 3rd to open in the power supply end position 1 of driving tube M1
Close S3 (not shown), to adjust fluorescent lifetime, the grid of G-signal connection first switch S1 and control first switch S1 closure and
Open, the grid of Em signals connection second switch S2 simultaneously controls closure and the unlatching of second switch S2.The present embodiment is individually to exist
The output end position 2 of driving tube M1 illustrates exemplified by setting second switch S2.The S1, S2, S3 switches can be p-type MOS
Pipe, N-type metal-oxide-semiconductor or transmission gate.
(i.e. open position is kept) is closed as shown in figure 3, taking and being rolled with every row second switch S2 (Toff), controls a frame
The T3 times are closed in (1Frame) time, the first switch S1 and S2 for closing use can be p-type MOS, N-type MOS or transmission
Door.In the present embodiment second switch S2 be p-type metal-oxide-semiconductor exemplified by, so circuit control in be high level close low level open, in this way
Second switch S2 is N-type metal-oxide-semiconductor, and corresponding is that low level pass high level is opened in circuit control.Each Em signals are sent out to adjust
Control signal used between light time, each G-signal are to enter the control signal of data per row write.The T1 times write data, T2 times
Shine, the T3 times close.
As shown in figure 3, specific often row detailed step is as follows：
Step 1：The T1 times write data, in a frame one's own profession start, Em signals from low level be changed into high level control second switch
S2 is closed, and G-signal is changed into low level from high level, and control first switch S1 is opened, and control will often row analog voltage Vdt data be write
Enter storage capacitor C1；
Step 2：The T2 times shine, and Em signals are changed into low level control second switch S2 conductings from high level, and G-signal is by low level
It is changed into high level, control first switch S1 is closed, and storage capacitor C1 drivings driving tube M1 makes luminescent device shine；
Step 3：The T3 times close, and Em signals are changed into high level control second switch S2 from low level and close, and G-signal is in high electricity
Flat, control first switch S1 is closed；
Step 4：Circulation step 2- steps 3, often row, which rolls, closes the T3 times (i.e. open position is kept).
LED control signal pulse Epulse opens (i.e. T3 times), and luminescent device is closed；Adjustment, which shines, to be controlled
The unlatching number of signal pulse Epulse processed, can control luminescent device actual opening time in a frame time, adjust driving
The electric current driving scope of pipe M1, makes driving current be in the higher region I2~I4 of homogeneity, and the overall display for improving screen is equal
One property.
Simultaneously closed off as shown in figure 4, taking with every row switch Toff (for second switch S2 in the present embodiment), control a frame
Simultaneously close off the time of LED control signal pulse Epulse in time, the switch of closing can use p-type MOS, N-type MOS or
Person's transmission gate.Exemplified by second switch S2 is p-type metal-oxide-semiconductor, so be that high level closes low level and opens in circuit control, in this way second
It is N-type metal-oxide-semiconductor to switch S2, and corresponding is that low level pass high level is opened in circuit control.When each Em signals shine to adjust
Between used control signal, each G-signal is to enter the control signal of data per row write.Certain T3 periods can also be divided into some
Period spreads to divide and is inserted in a frame.
As shown in Figure 2-5, for each Em signals to adjust the control signal used in fluorescent lifetime, each G-signal is per row write
Enter the control signal of data.The T1 times write data, and the T2 times shine, and the T3 times close.After adjusting fluorescent lifetime so that driving
Operation intervals of the pipe M1 in the I_V curves of driving tube M1 includes I1~I3 from original galvanic areas scope, is adjusted to electric current
Regional extent is I2~I4, eliminates the non-uniform areas of galvanic areas scope I1~I2.So as to show galvanic areas used
Scope is I2~I4, improves and shows homogeneity.
Second of structure：The image element circuit of external compensation type, is divided into p-type metal-oxide-semiconductor and N-type according to the type of driving tube M1
Metal-oxide-semiconductor, its principle is identical, so only being illustrated herein without tough state by taking p-type metal-oxide-semiconductor as an example.As shown in fig. 6, external compensation
The image element circuit collocation this patent of type, the power supply of second switch S2 or driving tube M1 is set in the output end position 2 of driving tube M1
End position 1 sets the 3rd switch S3, or sets second switch S2 and the 3rd to switch S3 to adjust fluorescent lifetime at the same time.Fig. 6 is only
It is in the output end position 2 of driving tube M1 and the power supply end position 1 of driving tube M1 while to set second switch S2 and the 3rd to open
Illustrated exemplified by the S3 of pass.First switch S1 in Fig. 6, second switch S2, the 3rd switch S3 and the 4th switch S4 can be p-types
MOS, N-type MOS or transmission gate, remove outside M1, entirely switch, and are only divided into Gn switches and EM switches.
The circuit structure includes first switch S1, second switch S2, the 3rd switch S3 and the 4th switch S4, storage capacitor C1
And driving tube M1, wherein one end of first switch S1 as data signal input, the other end respectively with storage capacitor C1 and
One end connection of driving tube M1 intersects at A points；The other end of storage capacitor C1 and the power supply termination operating voltage of driving tube M1
The other end of Vdd, driving tube M1 pass through the specific luminescent device of second switch S2 connections as the output terminal of whole drive circuit
(light emitting diode).Second switch S2 is set at the same time in the output end position 2 of driving tube M1 and the power supply end position 1 of driving tube M1
Fluorescent lifetime is adjusted with the 3rd switch S3.4th switch S4 one end is connected to the output terminal and second switch S2 mono- of driving tube M1
End intersects at B points, the 4th switch S4 other end connection external data signal lines Dn.G-signal connection first switch S1 and the 4th is opened
Close the grid of S4 and control closure and the unlatching of the switches of first switch S1 and the 4th S4；Em signals connect second switch S2 and the 3rd
The grid of S3 is switched, and controls closure and the unlatching of the switches of second switch S2 and the 3rd S3.
Exterior I C controls are needed to be used cooperatively for the image element circuit of external compensation type：First to extract the electric current of driving tube M1
Iref is write in storage capacitor C1 to calculate the threshold voltage vt h of M1, then by driving data voltage Vdt '=Vdt+Vth, so
Eliminate the threshold voltage vt h of M1 so that display is more uniform.So sequence diagram of its sequential and Fig. 3 Fig. 4 is somewhat different, such as
Fig. 7 is illustrated.
Although the image element circuit of external compensation type eliminates the threshold voltage vt h of driving tube, the threshold got is calculated
Threshold voltage Vth is always variant with the actual threshold voltage Vth of driving tube, so that can not be fully compensated and eliminate not
.Along with the characteristic of mos pipes is less than electric current lower region in electric current upper zone, change relative amplitude.So exterior mend
The image element circuit collocation this patent of type is repaid, selects the T3 times to adjust the operation interval of driving tube, can make it that driving tube M1 is electric
Stream regional extent is operated in I2~I4 regions, avoids galvanic areas scope I1~I2 regions so that display is more uniform.
Sequential is as shown in fig. 7, specific often row detailed step is as follows：
Step 1：The T0 times eliminate threshold voltage vt h, and G-signal is changed into low level control first switch S1 from high level, the 4th opens
Close S4 to open, Em signals are in low level control second switch S2, the 3rd switch S3 is opened, and display screen external reference current leads to
Cross data signal line Dn and feed driving tube M1, calculate the semiconductor process parameter of each pixel driver pipe M1 and correct display
Data voltage.
Step 2：The T1 times write data, and G-signal is in low level control first switch S1, the 4th switch S4 is opened, Em
Signal is changed into the high level switches of control second switch S2 and the 3rd S3 from low level and closes, and external compensation unit passes through data-signal
Line Dn inputs to display data voltage Vdts of the pixel driver pipe M1 after overcorrection, and data voltage Vdt is stored in energy storage electricity
Hold in C1 until next frame display data arrives；
Step 3：The T2 times shine, and G-signal low level is changed into high level control first switch S1, the 4th switch S4 is closed, Em letters
Number being changed into the switches of low level control second switch S2 and the 3rd S3 from high level opens, and luminescent device is in luminance；Step
4：The T3 times close, and G-signal maintains the high level switches of control first switch S1 and the 4th S4 to close, and Em signals are changed into from low level
High level controls the switches of second switch S2 and the 3rd S3 to close, and LED control signal pulse Epulse opens (T3 periods), hair
Optical device is closed；The unlatching number of LED control signal pulse Epulse is adjusted, luminescent device can be controlled one
The actual opening time in frame time, adjusts the electric current driving scope of driving tube M1, driving current is in the higher area of homogeneity
Domain I2~I4, improves the overall of screen and shows homogeneity.
The third structure：The image element circuit of internal compensation type is divided into p-type metal-oxide-semiconductor and N-type MOS according to the type of driving tube M1
Pipe, its principle is identical, so only being illustrated herein without tough state by taking p-type metal-oxide-semiconductor as an example.According to input driving data type
It is divided into voltage driving and electric current driving, Fig. 8 is electric current driving, and Fig. 9 is voltage driving.
As shown in figure 8, the pixel collocation this patent of internal compensation current type, is set in the output end position 2 of driving tube M1
The power supply end position 1 of second switch S2 or driving tube M1 sets the 3rd switch S3, or sets in position 2 and position 1 the at the same time
Two switch S2 and the 3rd switch S3 to adjust fluorescent lifetime.Fig. 8 is opened with adding second in the output end position 2 of driving tube M1
Illustrate exemplified by the S2 of pass.First switch S1 in Fig. 8, second switch S2, the 4th switch S4 can be p-type metal-oxide-semiconductor, N-type metal-oxide-semiconductor or
Transmission gate, removes outside driving tube M1, is entirely used as switch, is only divided into Gn switches and EM switches.Its sequential
Figure can be according to Fig. 3 or Fig. 4.
As shown in figure 8, the circuit structure includes first switch S1, second switch S2, the 4th switch S4 and storage capacitor C1
And driving tube M1, wherein input terminal of the one end of first switch S1 as data current Idt, the other end respectively with storage capacitor
The connection of one end of C1 and driving tube M1 intersects at A points；The other end of storage capacitor C1 and the power supply termination activities electricity of driving tube M1
Vdd is pressed, the other end of driving tube M1 passes through the specific photophore of second switch S2 connections as the output terminal of whole drive circuit
Part (such as OLED light emitting diodes), sets second switch S2 to adjust fluorescent lifetime on the output end position 2 of driving tube M1；The
Four switch S4 one end are connected to the output terminal of driving tube M1 and second switch S2 one end intersects at B points, the 4th switch S4 other ends
Connect data current Idt；G-signal connects the grid of the switches of first switch S1 and the 4th S4, and controls first switch S1 and the 4th
Closure and the unlatching of S4, the grid of EM signals connection second switch S2 are switched, and controls closure and the unlatching of second switch S2.
Original current mode compensation circuit there are the problem of, in T1 periods G-signal closure first switch S1, the 4th switch
S4 writes data current Idt, and such A points are credited to a magnitude of voltage Vg, and data current Idt is different, and magnitude of voltage Vg is also different.When
The T1 periods terminate, and G-signal disconnects the switch S4 of first switch S1 and the 4th, and magnitude of voltage Vg is in a frame fluorescent lifetime Duan Wei below
Hold luminous.Since the electric current that luminescent device needs includes the galvanic areas (such as 50pA~1nA) of the small ranks of I1~I2, that is, drive
Pipe needs to export I1~I2 to luminescent device, then in T1 period write currents, low current within the T1 periods cannot gram
Take the parasitic capacitance C2 of alignment, then can not just be correctly written in magnitude of voltage Vg, cause display mistake.
Original current compensation circuit collocation this patent, adjusts the current work scope of driving tube to I2~I4 sections,
Since electric current I2 is bigger, it is sufficient to overcome the parasitic capacitance C2. of alignment to use the image element circuit of current compensation type
.
The pixel collocation this patent of internal compensation voltage-type is as shown in figure 9, the output end position 2 in driving tube M1 sets the
The power supply end position 1 of two switch S2 or driving tube M1 sets the 3rd switch S3, or sets second switch S2 and the 3rd to open at the same time
S3 is closed to adjust fluorescent lifetime.Fig. 9 is illustrated by 1 position while exemplified by adding the 3rd switch S3.
First switch S1 in Fig. 9, the 3rd switch S3, the 4th switch S4, the 5th switch S5 can be p-type metal-oxide-semiconductor, N-type MOS
Pipe or transmission gate, remove outside driving tube M1, entirely switch, and are only divided into G-signal controlling switch and the control of EM signals is opened
Close.Its sequence diagram can be according to Fig. 3.
As shown in figure 9, the circuit structure includes first switch S1, the 3rd switch S3, the 4th switch S4, the 5th switch S5,
(gamma is changed as valid data by storage capacitor C1 and parasitic capacitance C2 and driving tube M1, wherein one end of first switch S1
Analog voltage Vdt afterwards) input terminal, the one end of the other end respectively with the switches of storage capacitor C1 and the 5th S5 is connected and intersects at A points；
The other end of storage capacitor C1 connects one end of the 3rd switch S3, another termination of the 3rd switch S3 with the power end of driving tube M1
Operating voltage Vdd；One end connection voltage data Vf of 4th switch S4, the other end of the 5th switch S5 of other end connection and drive
One end connection of dynamic pipe M1 intersects at B points；The other end of driving tube M1 is specific as the output terminal connection of whole drive circuit
Luminescent device (light emitting diode), sets the 3rd switch S3 to adjust fluorescent lifetime in the power supply end position 1 of driving tube M1.G believes
Number connection first switch S1 and the 4th switch S4 grid, and control first switch S1 and the 4th switch S4 closure and unlatching,
The grid of the 3rd switch S3 of EM signals connection, and control closure and the unlatching of the 3rd switch S3.
Original voltage compensation circuit there are the problem of, control closure S1 write-in A points simulation electricity in T1 periods G-signal
Voltage data Vdt, B the point magnitude of voltage of pressure is Vf, and S points magnitude of voltage is Vf+Vth, in the T2 periods, forms the gray scale voltage that shines
Vdt-Vref, eliminates the inequality of the threshold voltage vt h of driving tube M1.Since the galvanic areas scope that luminescent device needs includes
The galvanic areas (such as 50pA~1nA) of the small ranks of I1~I2, i.e. the galvanic areas scope of driving tube M1 need to export I1~I2
To luminescent device, larger in the uneven difference of small area analysis region pipe, compensation effect is not good in larger current section.
Original current compensation circuit collocation this patent, adjusts the current work scope of driving tube M1 to I2~I4 areas
Between, since in high current region, itself uniformity of driving tube M1 is preferable, and compensation effect is more preferably.Can further it be lifted aobvious
Show effect.
The above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, those of ordinary skill in the art are to this hair
The modification or equivalent substitution that bright technical solution is made, without departing from the spirit and scope of technical scheme, contain
Cover in scope of the presently claimed invention.
Claims (7)
- A kind of 1. driving method of optional driving tube working region, it is characterised in that：Using in active pixel drive circuit The time length that luminescent device shines in increase by one frame of switch-mode regulation, on the premise of ensureing that required luminosity is constant, so that The current work regional extent of driving tube needed for realizing is between I2-I4.
- 2. driving method according to claim 1, it is characterised in that：The active pixel drive circuit includes basic model picture Plain circuit, external compensation type image element circuit or internal compensation type image element circuit, the switch are arranged on active pixel drive circuit Driving tube output terminal and/or power end, the switch is arranged to p-type metal-oxide-semiconductor, N-type metal-oxide-semiconductor or transmission gate, the drive Dynamic pipe includes p-type metal-oxide-semiconductor or N-type metal-oxide-semiconductor.
- 3. driving method according to claim 2, it is characterised in that：Luminescent device shines in one frame of switch-mode regulation Take to switch in a manner of rolling is closed or simultaneously closed off by every row in time and be controlled fluorescent lifetime.
- 4. driving method according to claim 1, it is characterised in that：The active pixel drive circuit is arranged to basic model Image element circuit, the output terminal for switching the driving tube for being arranged on active pixel drive circuit, the driving tube use N-type MOS Pipe, the time that luminescent device shines in one frame of switch-mode regulation take to switch to roll with every row and close, and the switch includes the Two switches, the interior work of one frame comprise the following steps that：Step 1：The T1 times write data, in a frame one's own profession start, Em signals control second switch close, G-signal control first Switch is opened, and controls analog voltage data writing storage capacitor；Step 2：The T2 times shine, and Em signals control second switch closure, G-signal control first switch S1 is closed, storage capacitor C1 driving driving tubes make luminescent device shine；Step 3：The T3 times close, and Em signals control second switch is closed, and G-signal control first switch is closed, at luminescent device In closed mode；Step 4：Circulation step 2- steps 3, often row, which rolls, closes the T3 times.
- 5. driving method according to claim 1, it is characterised in that：The active pixel drive circuit is arranged to exterior benefit Type image element circuit is repaid, the switch includes second switch and the 3rd switch, and the second switch is arranged on active pixel driving electricity The output terminal of the driving tube on road, the 3rd switch are arranged on the power end of the driving tube of active pixel drive circuit, the drive Dynamic pipe use p-type metal-oxide-semiconductor, and the time that luminescent device shines in one frame of switch-mode regulation is taken with every row switch rolling closing side Formula, the interior work of one frame comprise the following steps that：Step 1：The T0 times eliminate threshold voltage, and G-signal control first switch, the 4th switch are opened, and Em signals control second is opened Close, the 3rd switch unlatching, display screen external reference current feeds driving tube by data signal line, calculates each pixel The semiconductor process parameter of driving tube simultaneously corrects display data voltage；Step 2：The T1 times write data, and G-signal control first switch, the 4th switch are opened, Em signals control second switch and 3rd switch is closed, and is stored in by the display data voltage after correction, and by data voltage in storage capacitor until next frame is shown Registration is according to arrival；Step 3：The T2 times shine, and G-signal control first switch, the 4th switch are closed, Em signals control second switch and the 3rd Switch is opened, and luminescent device is in luminance；Step 4：The T3 times close, and G-signal control first switch and the 4th switch are closed, Em signals control second switch and the 3rd Switch is closed, and LED control signal pulse is opened, and luminescent device is closed.
- 6. a kind of drive circuit of optional driving tube working region, it is characterised in that what the drive circuit used has source image Plain drive circuit includes：Basic model image element circuit, external compensation type image element circuit or internal compensation type image element circuit；It is described active The output terminal and/or power end of the driving tube of pixel-driving circuit set switch, and the switch is arranged to p-type metal-oxide-semiconductor, N-type MOS Pipe or transmission gate, the driving tube include p-type metal-oxide-semiconductor or N-type metal-oxide-semiconductor.
- 7. drive circuit according to claim 6, it is characterised in that the driving type of the internal compensation type image element circuit Including voltage driven type and current drive-type.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110350264.XA CN113077760B (en) | 2017-12-11 | 2017-12-11 | Driving method of pixel driving circuit |
| CN201711305297.2A CN107909967B (en) | 2017-12-11 | 2017-12-11 | Driving method and driving circuit capable of selecting working area of driving tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711305297.2A CN107909967B (en) | 2017-12-11 | 2017-12-11 | Driving method and driving circuit capable of selecting working area of driving tube |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110350264.XA Division CN113077760B (en) | 2017-12-11 | 2017-12-11 | Driving method of pixel driving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107909967A true CN107909967A (en) | 2018-04-13 |
| CN107909967B CN107909967B (en) | 2021-04-09 |
Family
ID=61854107
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711305297.2A Active CN107909967B (en) | 2017-12-11 | 2017-12-11 | Driving method and driving circuit capable of selecting working area of driving tube |
| CN202110350264.XA Active CN113077760B (en) | 2017-12-11 | 2017-12-11 | Driving method of pixel driving circuit |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110350264.XA Active CN113077760B (en) | 2017-12-11 | 2017-12-11 | Driving method of pixel driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN107909967B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109215591A (en) * | 2018-09-26 | 2019-01-15 | 福建华佳彩有限公司 | A kind of external compensation circuit and driving method |
| CN110021263A (en) * | 2018-07-05 | 2019-07-16 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method, display panel |
| WO2019218954A1 (en) * | 2018-05-17 | 2019-11-21 | 京东方科技集团股份有限公司 | Pixel circuit, driving method and device therefor, array substrate and display device |
| CN111583871A (en) * | 2020-05-26 | 2020-08-25 | 昆山国显光电有限公司 | Pixel driving circuit, display panel and electronic device |
| CN111785207A (en) * | 2019-04-03 | 2020-10-16 | 北京小米移动软件有限公司 | Method and device for adjusting brightness of OLED display screen and electronic equipment |
| WO2021082869A1 (en) * | 2019-11-01 | 2021-05-06 | 京东方科技集团股份有限公司 | Pixel driving circuit and driving method therefor, display panel, and display device |
| CN112767872A (en) * | 2019-11-01 | 2021-05-07 | 京东方科技集团股份有限公司 | Pixel driving chip, driving method thereof and display device |
| CN113053328A (en) * | 2021-03-23 | 2021-06-29 | 高创(苏州)电子有限公司 | Light emitting device and driving method thereof, and light emitting substrate and driving method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113658550A (en) * | 2021-08-17 | 2021-11-16 | 晟合微电子(肇庆)有限公司 | Display and driving method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1941048A (en) * | 2005-05-26 | 2007-04-04 | 三星Sdi株式会社 | Organic light emitting display and driving method thereof |
| CN101697268A (en) * | 2009-09-24 | 2010-04-21 | 友达光电股份有限公司 | Organic light-emitting diode display, pixel circuit and data current write method |
| CN203520833U (en) * | 2013-09-09 | 2014-04-02 | 京东方科技集团股份有限公司 | Pixel circuit, driving circuit, array substrate and display device |
| CN104778918A (en) * | 2005-01-26 | 2015-07-15 | 霍尼韦尔国际公司 | Active matrix organic light emitting diode display |
| CN105427809A (en) * | 2016-01-04 | 2016-03-23 | 京东方科技集团股份有限公司 | Pixel compensation circuit and AMOLED display apparatus |
| CN105989803A (en) * | 2015-03-16 | 2016-10-05 | 苹果公司 | Organic light-emitting diode display with pulse-width-modulated brightness control |
| CN106057129A (en) * | 2016-08-24 | 2016-10-26 | 中国科学院上海高等研究院 | AMOLED display driving circuit and driving method thereof |
| CN106486053A (en) * | 2015-08-31 | 2017-03-08 | 乐金显示有限公司 | OLED and its driving method |
| KR20170132401A (en) * | 2016-05-23 | 2017-12-04 | 삼성디스플레이 주식회사 | Display apparatus and method of driving the same |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5309455B2 (en) * | 2007-03-15 | 2013-10-09 | ソニー株式会社 | Display device, driving method thereof, and electronic apparatus |
| JP4337897B2 (en) * | 2007-03-22 | 2009-09-30 | ソニー株式会社 | Display device, driving method thereof, and electronic apparatus |
| KR101042956B1 (en) * | 2009-11-18 | 2011-06-20 | 삼성모바일디스플레이주식회사 | Pixel circuit and organic light emitting display using thereof |
| KR101223488B1 (en) * | 2010-05-11 | 2013-01-17 | 삼성디스플레이 주식회사 | Organic Light Emitting Display and Driving Method Thereof |
| CN101996580A (en) * | 2010-11-10 | 2011-03-30 | 南开大学 | Silicon-based active organic light emitting diode (OLED) display pixel circuit |
| CN103280188B (en) * | 2013-06-14 | 2015-09-02 | 电子科技大学 | OLED compensation of ageing system and method |
| TW201706978A (en) * | 2015-08-04 | 2017-02-16 | 啟耀光電股份有限公司 | Display panel and pixel circuit |
| KR101731178B1 (en) * | 2015-10-02 | 2017-04-28 | 엘지디스플레이 주식회사 | Organic Light Emitting Display and Method of Driving the same |
| US9818344B2 (en) * | 2015-12-04 | 2017-11-14 | Apple Inc. | Display with light-emitting diodes |
| CN107393475A (en) * | 2017-08-10 | 2017-11-24 | 京东方科技集团股份有限公司 | Pixel-driving circuit, image element driving method and display device |
-
2017
- 2017-12-11 CN CN201711305297.2A patent/CN107909967B/en active Active
- 2017-12-11 CN CN202110350264.XA patent/CN113077760B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104778918A (en) * | 2005-01-26 | 2015-07-15 | 霍尼韦尔国际公司 | Active matrix organic light emitting diode display |
| CN1941048A (en) * | 2005-05-26 | 2007-04-04 | 三星Sdi株式会社 | Organic light emitting display and driving method thereof |
| CN101697268A (en) * | 2009-09-24 | 2010-04-21 | 友达光电股份有限公司 | Organic light-emitting diode display, pixel circuit and data current write method |
| CN203520833U (en) * | 2013-09-09 | 2014-04-02 | 京东方科技集团股份有限公司 | Pixel circuit, driving circuit, array substrate and display device |
| CN105989803A (en) * | 2015-03-16 | 2016-10-05 | 苹果公司 | Organic light-emitting diode display with pulse-width-modulated brightness control |
| CN106486053A (en) * | 2015-08-31 | 2017-03-08 | 乐金显示有限公司 | OLED and its driving method |
| CN105427809A (en) * | 2016-01-04 | 2016-03-23 | 京东方科技集团股份有限公司 | Pixel compensation circuit and AMOLED display apparatus |
| KR20170132401A (en) * | 2016-05-23 | 2017-12-04 | 삼성디스플레이 주식회사 | Display apparatus and method of driving the same |
| CN106057129A (en) * | 2016-08-24 | 2016-10-26 | 中国科学院上海高等研究院 | AMOLED display driving circuit and driving method thereof |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019218954A1 (en) * | 2018-05-17 | 2019-11-21 | 京东方科技集团股份有限公司 | Pixel circuit, driving method and device therefor, array substrate and display device |
| US11373602B2 (en) | 2018-05-17 | 2022-06-28 | Boe Technology Group Co., Ltd. | Pixel circuit, method and apparatus for driving the same, array substrate, and display apparatus |
| CN110021263A (en) * | 2018-07-05 | 2019-07-16 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method, display panel |
| WO2020007024A1 (en) * | 2018-07-05 | 2020-01-09 | Boe Technology Group Co., Ltd. | Pixel circuit, driving method thereof, and display panel |
| CN109215591A (en) * | 2018-09-26 | 2019-01-15 | 福建华佳彩有限公司 | A kind of external compensation circuit and driving method |
| CN111785207A (en) * | 2019-04-03 | 2020-10-16 | 北京小米移动软件有限公司 | Method and device for adjusting brightness of OLED display screen and electronic equipment |
| WO2021082869A1 (en) * | 2019-11-01 | 2021-05-06 | 京东方科技集团股份有限公司 | Pixel driving circuit and driving method therefor, display panel, and display device |
| CN112767872A (en) * | 2019-11-01 | 2021-05-07 | 京东方科技集团股份有限公司 | Pixel driving chip, driving method thereof and display device |
| US11322076B2 (en) | 2019-11-01 | 2022-05-03 | Beijing Boe Optoelectronics Technology Co., Ltd. | Pixel driving chip and driving method therefor, and display apparatus |
| US11386846B2 (en) | 2019-11-01 | 2022-07-12 | Boe Technology Group Co., Ltd. | Pixel driving circuit having two data signals to compensate for threshold voltage and driving method |
| US11735115B2 (en) | 2019-11-01 | 2023-08-22 | Boe Technology Group Co., Ltd. | Pixel driving circuit having two data signals to compensate for threshold voltage and driving method |
| CN111583871A (en) * | 2020-05-26 | 2020-08-25 | 昆山国显光电有限公司 | Pixel driving circuit, display panel and electronic device |
| CN113053328A (en) * | 2021-03-23 | 2021-06-29 | 高创(苏州)电子有限公司 | Light emitting device and driving method thereof, and light emitting substrate and driving method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113077760B (en) | 2022-11-01 |
| CN107909967B (en) | 2021-04-09 |
| CN113077760A (en) | 2021-07-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107909967A (en) | A kind of driving method and drive circuit of optional driving tube working region | |
| US11823621B2 (en) | Electronic devices with low refresh rate display pixels | |
| US20230089780A1 (en) | Display panel, driving method, and display device | |
| CN105206221B (en) | Pixel-driving circuit, driving method, array substrate and display device | |
| CN104700778B (en) | AMOLED pixel-driving circuits and image element driving method | |
| CN111862890B (en) | Display panel, driving method thereof and display device | |
| CN104821150B (en) | Image element circuit and its driving method and display device | |
| CN104575394B (en) | AMOLED (active matrix organic light emitting display) pixel driving circuit and pixel driving method | |
| US8730281B2 (en) | Image display device | |
| CN110021265A (en) | A kind of pixel circuit and its driving method, display device and driving method | |
| KR100659155B1 (en) | Current feedback type amoled driving circuit | |
| CN112509519A (en) | Display panel driving method and display device | |
| CN105206220B (en) | Pixel-driving circuit, driving method, array base palte and display device | |
| CN108597450A (en) | Pixel circuit and its driving method, display panel | |
| CN105161056B (en) | Pixel for display | |
| CN107871469A (en) | Light-emitting display apparatus | |
| CN102110415A (en) | Drive circuit and display device | |
| CN109545137A (en) | Sub-pixel unit, display panel, display device and its driving method | |
| CN112581901B (en) | Display panel, display driving method thereof and electronic equipment | |
| CN108538253B (en) | The pixel driver system and driving method of displayer | |
| CN109300436A (en) | AMOLED pixel-driving circuit and driving method | |
| CN105895027B (en) | The data drive circuit of AMOLED display device | |
| CN107731168B (en) | OLED pixel driving circuit, OLED display panel and driving method | |
| CN112331149A (en) | Grid circuit and driving method | |
| CN110415648A (en) | GOA circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wu Suhua Inventor after: Li Shouxin Inventor after: Hou Shanshan Inventor before: Wu Suhua Inventor before: Li Shouxin Inventor before: Yu Youyong Inventor before: Hou Shanshan |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |