CN203746857U - Pixel circuit, organic light-emitting display panel and display device - Google Patents
Pixel circuit, organic light-emitting display panel and display device Download PDFInfo
- Publication number
- CN203746857U CN203746857U CN201420125431.6U CN201420125431U CN203746857U CN 203746857 U CN203746857 U CN 203746857U CN 201420125431 U CN201420125431 U CN 201420125431U CN 203746857 U CN203746857 U CN 203746857U
- Authority
- CN
- China
- Prior art keywords
- storage capacitance
- time
- image element
- element circuit
- signal input
- 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.)
- Expired - Lifetime
Links
- 230000002045 lasting effect Effects 0.000 claims abstract description 6
- 239000010409 thin film Substances 0.000 claims description 17
- 239000010408 film Substances 0.000 claims description 16
- 238000005401 electroluminescence Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 abstract description 14
- 238000013461 design Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 5
- 239000003990 capacitor Substances 0.000 abstract 4
- 230000005611 electricity Effects 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000012937 correction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 229920001621 AMOLED Polymers 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Abstract
The utility model provides a pixel circuit, an organic light-emitting display panel and a display device. The pixel circuit comprises a first signal input end which is used for receiving charging signals lasting for a first time in a charging stage, and a first switch unit which is connected between a storage capacitor and the first input signal end; the first switch unit can be in a switched-on state under the control of the charging signals lasting for the first time, so that the charging signals can charge the storage capacitor for the first time, and therefore, the storage capacitor can achieve first electricity quantity; the first time is corresponding to a display gray level; and when the storage capacitor achieves the first electricity quantity, the light-emitting luminance of an organic light-emitting diode in a light-emitting stage is corresponding to the display gray level. Thus, the structure and driving process of the pixel circuit can be simplified, and design difficulty of the hardware of a driving circuit board can be reduced, and the area of the driving circuit board can be decreased, and the display panel and the display device can be light-weighted.
Description
Technical field
The utility model relates to organic light emitting display field, relates in particular to a kind of image element circuit, organic electroluminescence display panel and display unit.
Background technology
Traditional display device, in the time being pixel cell charging, is all to go charging to fixing magnitude of voltage of each pixel cell to pixel, and this magnitude of voltage produces by gamma (Gamma) correcting circuit.
The gamma correction circuit of existing design adopts a series of gamma resistance, by the dividing potential drop effect of resistance, obtains one group of gamma voltage value.In the time driving chip (Source IC) to each pixel cell charging, export as reference voltage taking gamma voltage exactly, come to charge to each pixel cell.
For example, for the output signal of 6 bytes (bit), when showing certain one-level GTG at some pixel cells, during as the 60th grade of GTG L60, the data that source driving chip can send according to time schedule controller (TCON), find the magnitude of voltage V60 that in gamma voltage, L60 is corresponding, and then source driving chip can, to the voltage of this pixel cell output V60, come to this pixel cell charging.
Sort circuit design of the prior art, because the quantity of gamma resistance is a lot, take too much drive circuit board (PCB) area, thereby the area that makes drive circuit board becomes large, and cause drive circuit board layout designs complexity, the cabling of gamma voltage to be difficult for realizing, simultaneously, the One's name is legion of gamma resistance, also causes the debugging complexity of gamma resistance.
Utility model content
The utility model provides a kind of image element circuit, organic electroluminescence display panel and display unit, thereby can simplify image element circuit structure composition and driving process, reduce drive circuit board hardware designs difficulty, reduce the area of drive circuit board, make display floater and display unit reach the effect of lightness.
The utility model provides scheme as follows:
The utility model embodiment provides a kind of image element circuit, comprising: driving transistors, storage capacitance, Organic Light Emitting Diode, and described image element circuit also comprises:
First signal input, for receiving the charging signals that continues the very first time in the charging stage;
The first switch element, be connected between the first end and described first signal input of described storage capacitance, described the first switch element can be in conducting state under the control of the charging signals of the described lasting very first time, so that described charging signals charges the described very first time to described storage capacitance, make described storage capacitance reach the first electric weight;
Wherein, the described very first time and one shows that greyscale level is corresponding, and described storage capacitance is in the time of described the first electric weight, and described Organic Light Emitting Diode is corresponding with described demonstration greyscale level at the luminosity of glow phase.
Preferably, the source electrode of described driving transistors connects secondary signal input;
The grid of described driving transistors is connected with the first end of described storage capacitance;
The second end of the drain electrode of described driving transistors and described storage capacitance, the anodic bonding of described Organic Light Emitting Diode;
The negative electrode of described Organic Light Emitting Diode is connected with the 3rd signal input part.
Preferably, described charging signals is the signal with default duty ratio, and described default duty ratio determines the described very first time.
Preferably, described the first switch element comprises the first film transistor;
The transistorized source electrode of described the first film and grid, be connected with described first signal input, and the transistorized drain electrode of described the first film is connected with the first end of described storage capacitance.
Preferably, described the first switch element comprises the first piezo-resistance;
The first end of described the first piezo-resistance is connected with described first signal input, and the second end of described the first piezo-resistance is connected with the first end of described storage capacitance.
Preferably, described the first piezo-resistance is positive temperature coefficient piezo-resistance.
Preferably, described first signal input, also for receiving the discharge signal of second time of continuing at discharge regime;
Described the first switch element can be in conducting state, so that described discharge signal discharges described the second time to described storage capacitance under the control of the described discharge signal that continued for the second time.
Preferably, described image element circuit also comprises:
The 4th signal input part, for receiving the discharge signal of second time of continuing at discharge regime;
Second switch unit, be connected between the first end and described the 4th signal input part of described storage capacitance, described second switch unit can be in conducting state under the control of described discharge signal, so that described discharge signal discharges described the second time to described storage capacitance.
Preferably, described second switch unit comprises the second thin-film transistor;
The source electrode of described the second thin-film transistor and grid, be connected with described the 4th signal input part, and the drain electrode of described the second thin-film transistor is connected with the first end of described storage capacitance.
Preferably, described second switch unit comprises the second piezo-resistance;
The first end of described the second piezo-resistance is connected with described the 4th signal input part, and the second end of described the second piezo-resistance is connected with the first end of described storage capacitance.
Preferably, described the second piezo-resistance is negative temperature coefficient piezo-resistance.
The utility model embodiment also provides a kind of organic electroluminescence display panel, and this organic electroluminescence display panel specifically can comprise the image element circuit that above-mentioned the utility model embodiment provides.
The utility model embodiment also provides a kind of display unit, and this display unit specifically can comprise the organic electroluminescence display panel that above-mentioned the utility model embodiment provides.
Can find out from the above, image element circuit, organic electroluminescence display panel and display unit that the utility model embodiment provides, by arranging in image element circuit: first signal input, for receive the charging signals that continues the very first time in the charging stage; The first switch element, be connected between described storage capacitance first end and described first signal input, described the first switch element can be in conducting state under the control of the charging signals of the described lasting very first time, so that described charging signals charges the described very first time to described storage capacitance, make described storage capacitance reach the first electric weight; Wherein, the described very first time and one shows that greyscale level is corresponding, and described storage capacitance is in the time of described the first electric weight, and described Organic Light Emitting Diode is corresponding with described demonstration greyscale level at the luminosity of glow phase.Thereby can simplify image element circuit structure composition and driving process, reduce drive circuit board hardware designs difficulty, reduce the area of drive circuit board, make display floater and display unit reach the effect of lightness.
Brief description of the drawings
The image element circuit structure schematic diagram one that Fig. 1 provides for the utility model embodiment;
Related demonstration greyscale level and the charging interval corresponding relation schematic diagram of image element circuit that Fig. 2 provides for the utility model embodiment;
The image element circuit structure schematic diagram two that Fig. 3 provides for the utility model embodiment;
The image element circuit structure schematic diagram three that Fig. 4 provides for the utility model embodiment;
The image element circuit structure schematic diagram four that Fig. 5 provides for the utility model embodiment;
The image element circuit structure schematic diagram five that Fig. 6 provides for the utility model embodiment;
The image element circuit structure schematic diagram six that Fig. 7 provides for the utility model embodiment;
The driving method schematic flow sheet one of the image element circuit that Fig. 8 provides for the utility model embodiment;
The driving method schematic flow sheet two of the image element circuit that Fig. 9 provides for the utility model embodiment.
Embodiment
For making object, technical scheme and the advantage of the utility model embodiment clearer, below in conjunction with the accompanying drawing of the utility model embodiment, the technical scheme of the utility model embodiment is clearly and completely described.Obviously, described embodiment is a part of embodiment of the present utility model, instead of whole embodiment.Based on described embodiment of the present utility model, the every other embodiment that those of ordinary skill in the art obtain, belongs to the scope that the utility model is protected.
Unless otherwise defined, technical term used herein or scientific terminology should be and in field, have the ordinary meaning that the personage of general technical ability understands under the utility model." first ", " second " and the similar word that in the utility model patent application specification and claims, use do not represent any order, quantity or importance, and are just used for distinguishing different parts.Equally, the similar words such as " " or " " do not represent restricted number yet, but represent to exist at least one." connection " or " being connected " etc. similarly word be not defined in connection physics or machinery, but can comprise electrical connection, no matter be directly or indirectly." on ", D score, " left side ", " right side " etc. are only for representing relative position relation, after being described the absolute position of object and changing, this relative position relation also correspondingly changes.
The technical scheme that the utility model embodiment provides, by the control to the storage capacitance Cst charging interval in image element circuit, thereby reach the control of the electric weight that storage capacitance Cst is stored, the electric weight of storing due to storage capacitance Cst, directly have influence on the luminosity of Organic Light Emitting Diode OLED in glow phase, show greyscale level, therefore, the utility model embodiment, by the control to the storage capacitance Cst charging interval, can realize the object of the demonstration GTG of controlling image element circuit place pixel cell.
Because the utility model embodiment is in to the control procedure of pixel cell demonstration greyscale level, few (for example one) signal input part only need be set in image element circuit, and for example, by corresponding data line (data wire), to receive the control signal (comprising charging signals and/or discharge signal) that drives chip (Source IC) to send, and too much signal input terminal and other additional devices need to be set in image element circuit, the gamma correction circuit that comprises One's name is legion gamma resistance need to be set in drive circuit board yet, therefore, can simplify image element circuit structure composition and driving process, reduce drive circuit board hardware designs difficulty, reduce the area of drive circuit board, make display floater and display unit reach the effect of lightness.
Below in conjunction with accompanying drawing, the technical scheme that the utility model embodiment is provided is described in detail.
The utility model embodiment provides a kind of image element circuit, and as shown in Figure 1, this image element circuit specifically can comprise: driving transistors T
d, storage capacitance Cst, Organic Light Emitting Diode OLED.Meanwhile, this image element circuit can also comprise:
First signal input, for receiving the charging signals I that continues very first time t1 in the charging stage
data;
The first switch element 1, is connected between storage capacitance Cst first end and first signal input, and the first switch element 1 can be at the charging signals I that continues very first time t1
datacontrol under in conducting state, so that charging signals I
datato storage capacitance Cst charging very first time t1, make storage capacitance Cst reach the first electric weight;
Wherein, very first time t1 and shows that greyscale level is corresponding, and storage capacitance Cst is in the time of the first electric weight, and Organic Light Emitting Diode OLED is corresponding with described demonstration greyscale level at the luminosity of glow phase.
Meanwhile, as shown in Figure 1, related driving transistors T in the utility model embodiment
dsource electrode connect secondary signal input;
Driving transistors T
dgrid be connected with storage capacitance Cst first end;
Driving transistors T
ddrain electrode and the second end of storage capacitance Cst, the anodic bonding of Organic Light Emitting Diode OLED;
Organic Light Emitting Diode T
dnegative electrode be connected with the 3rd signal input part.
In the utility model embodiment, secondary signal input can be for inputting a high level signal, for example VDD, and the 3rd signal input part can be for inputting a low level signal, for example GND.
So, the image element circuit structure based on shown in accompanying drawing 1 can be determined, the drive current I of Organic Light Emitting Diode OLED
oledcan calculate and obtain by following computing formula:
I
OLED=1/2K(V
cst-V
th-V
OLED)
2 ①
Wherein, COEFFICIENT K is thin-film transistor (TFT, i.e. driving transistors T
d) the voltage mobility function relevant to channel width-over-length ratio, after thin-film transistor is made, its value is fixing.V
thfor driving transistors T
dthreshold voltage, V
oLEDfor the threshold voltage of Organic Light Emitting Diode OLED.
Can draw 1. from formula, change V
cstvalue can be controlled the luminosity of Organic Light Emitting Diode OLED, reaches the object of controlling GTG.
Formula 1. in, V
cstbe the size of storage capacitance Cst voltage (being electric weight).
Charging formula according to electric capacity:
t=CU/I
data ②
Wherein, the capacitance size that C is storage capacitance, its value is fixing, and U is to storage capacitance voltage swing, equals V at this
cst, I
datafor constant-current source current value, its value is fixing (is the charging signals I of first signal input input
datamagnitude of voltage is fixed).
So, according to formula 1. with 2., obtain:
I
OLED=1/2K(I
data*t/C-V
th-V
OLED)
2 ③
Can obtain charging interval t difference from formula 3 time, the drive current I of Organic Light Emitting Diode OLED
oLEDdifference, and drive current I
oLEDthe luminosity that has directly affected Organic Light Emitting Diode OLED shows greyscale level, therefore can determine, in the image element circuit that the utility model embodiment is provided, the control in storage capacitance Cst charging interval, can reach the object that image element circuit place pixel cell is shown to GTG control.
Here it should be noted that, according to gamma (gamma) correction function, the charging interval ti that i level GTG is corresponding meets following formula:
V
ti=V*[1-exp(-ti/RC
i)] ④
Wherein, V represents charging voltage, and R represents charging circuit resistance, C
irepresent pixel electrode capacitance, the gray scale voltage V of corresponding i level GTG
tiobtained by gamma correction curve, function exp () represents the exponential function taking constant e the end of as.Show duty ratio L corresponding to greyscale level by obtaining each after Gamma correction, as shown in Figure 2, this duty ratio can determine the charging interval ti that each demonstration greyscale level is corresponding.
Therefore,, in the utility model embodiment, can determine in advance and show charging interval corresponding to greyscale level.In the time that needs show a frame picture, according to the greyscale level number that in a frame picture, all pixel cells comprise, determine within the frame picture disply time, the pixel cell quantity that need to charge luminous, the information of position, and by the exclusive data line of image element circuit in each pixel cell, show that to difference pixel cell corresponding to greyscale level sends charging signals successively.
Further say, in the utility model embodiment, can preferably each charging interval corresponding to demonstration greyscale level be stored in memory (EEPROM), and after being encoded, the address of each pixel cell is also stored in memory, when time schedule controller (TCON) receives after the data of a frame picture, calculate the needed display gray scale grade quantity of a frame picture, and each shows pixel cell corresponding to greyscale level; Time schedule controller, by consults memory, determines that each shows charging interval corresponding to greyscale level, and the positional information of pixel cell; In order, show pixel cell corresponding to greyscale level to difference successively, send the charging signals that continues the corresponding charging interval, show that to difference pixel cell corresponding to greyscale level charges successively, so that corresponding difference shows that pixel cell corresponding to greyscale level is luminous successively within the frame picture disply time.
Visible, in the utility model embodiment, the scanning sequence of pixel cell can not lined by line scan, but can be based on showing greyscale level, formulate a DISPLAY ORDER, and drive successively corresponding pixel cell charging luminous, in the utility model embodiment, a moment within the frame picture disply time, luminous after only having pixel cell corresponding to a certain demonstration greyscale level to be charged.
Can find out the charging signals I that the utility model embodiment is related based on above statement
data, specifically can be the signal with default duty ratio, and this default duty ratio has determined the charging interval of this image element circuit, i.e. very first time t1.Be the related charging signals I of the utility model embodiment
data, specifically can be the current source of a pulse width variability, it specifically can have two states, V
highwith V
low.As charging signals I
databe output as V
high, can make the first switch element 1 in conducting state, the first switch element 1 is equivalent to short circuit, charging signals I
datagive storage capacitance Cst charging by the first switch element 1, as charging signals I
databe output as V
lowtime, the first open unit 1, in cut-off state, is equivalent to open circuit, and storage capacitance Cst can keep charging voltage value.
So, in the utility model one specific embodiment, as shown in Figure 3, the first switch element 1 that the utility model embodiment is related, specifically can comprise:
The first film transistor T 1;
The source electrode of the first film transistor T 1 and grid, can be connected with first signal input IN1, and the drain electrode of the first film transistor T 1 can be connected with the first end of storage capacitance Cst.
Due to source electrode and the grid of the first film transistor T 1, be connected with first signal input IN1 simultaneously, therefore, as charging signals I
databe output as V
hightime (common, V
highbe greater than the threshold voltage of the first film transistor T 1), the first film transistor T 1 can be in conducting state, so that charging signals I
datathrough the first film transistor T 1, be storage capacitance Cst charging, and the charging interval equal charging signals I
databe output as V
highduration.As charging signals I
databe output as V
lowtime (common, V
lowbe less than the threshold voltage of the first film transistor T 1), the first film transistor T 1 is in cut-off state, and therefore, charging finishes, and storage capacitance Cst can keep charging voltage value.
Because charging signals is generally high level signal, therefore, the related the first film transistor T 1 of the utility model embodiment specifically can be N thin-film transistor, to realize high level conducting, and the charging control of low level cut-off.
And in another specific embodiment of the utility model, as shown in Figure 4, the first switch element 1 that the utility model embodiment is related, specifically can comprise:
The first piezo-resistance RV1;
The first end of the first piezo-resistance RV1 is connected with first signal input IN1, and the second end of the first piezo-resistance RV1 is connected with the first end of storage capacitance Cst.
Here, the first related piezo-resistance RV1 of the utility model embodiment can be positive temperature coefficient piezo-resistance, like this, and as charging signals I
databe output as V
hightime, based on the characteristic of piezo-resistance,, in the time that the voltage at piezo-resistance two ends equals or exceed its sense voltage, resistance will, from infinity, reduce rapidly, and under normal circumstances, V
highbe greater than the sense voltage of piezo-resistance, therefore, the first piezo-resistance RV1 can be in conducting state, so that charging signals I
datathrough the first piezo-resistance RV1, be storage capacitance Cst charging, and the charging interval equal charging signals I
databe output as V
highduration.As charging signals I
databe output as V
lowtime, if V
lowlower than the sense voltage of piezo-resistance, therefore, the resistance infinity of the first piezo-resistance RV, the first piezo-resistance RV1 is in cut-off state, and therefore, charging finishes, and storage capacitance Cst can keep charging voltage value.
These are only the exemplary embodiments of the first related switch element 1 of the utility model embodiment, the first related switch element 1 of the utility model embodiment can also present with other forms of expression.
So, complete after the charging stage, the image element circuit that the utility model embodiment provides can be carried out glow phase, utilizes the electric weight of storage capacitance Cst storage, drives Organic Light Emitting Diode OLED luminous, and concrete luminous driving formula can be as implied above.
Here it should be noted that, in the utility model embodiment, require charging signals I
datavoltage, be less than or equal to the signal voltage of secondary signal input input, so that driving transistors T
dbe operated in saturation region.
Complete after charging stage, glow phase, the related image element circuit of the utility model embodiment can also be carried out discharge regime, storage capacitance Cst is carried out to zero clearing or electric charge distribution (charge sharing), so that the operation that storage capacitance is again charged within the next frame time period.
In the utility model one specific embodiment, the discharge operation of the image element circuit that the utility model embodiment provides, can be completed by the signal controlling of first signal input IN1 input equally, be in the utility model embodiment, first signal input IN1, also for receive the discharge signal that continues the second time t2 at discharge regime, the first switch element 1 can be in conducting state under the control of discharge signal that continues the second time t2, so that discharge signal is to storage capacitance electric discharge Cst the second time t2.
Due to, as long as input a voltage in one end of storage capacitance Cst lower than storage capacitance voltage V
cst, can realize the discharge operation to storage capacitance Cst, therefore, in the utility model embodiment, can select threshold voltage lower than V
low(due to V
lowlower than V
high, therefore can realize the discharge operation to storage capacitance Cst) and thin-film transistor, or sense voltage is lower than V
lowpiezo-resistance, can realize in the situation that the first switch element 1 is only set, can realize the charging operations to storage capacitance Cst, also can realize the discharge operation to storage capacitance Cst.
For fear of in glow phase, the first switch element, also in conducting state, drives Organic Light Emitting Diode OLED luminous thereby affect storage capacitance Cst, in this embodiment institute, and can be at first signal input input V
highand V
lowbetween, control the sender unit parts such as time schedule controller and do not send any signal to image element circuit, in the time that first signal input does not have signal input, the first switch element 1 nature is in cut-off state, thereby guarantee that storage capacitance Cst is in glow phase, drive Organic Light Emitting Diode OLED normally luminous.
And in another specific embodiment of the present utility model, as shown in Figure 5, the image element circuit that the utility model embodiment provides, specifically can also comprise:
The 4th signal input part IN4, for receiving the discharge signal that continues the second time t2 at discharge regime;
Second switch unit 2, is connected in storage capacitance Cst first end and the 4th signal input part IN4, and described second switch unit can be in conducting state under the control of discharge signal, so that discharge signal is to the storage capacitance Cst second time t2 that discharges.
The discharge signal that the utility model embodiment is related, specifically can be the signals such as reset signal, only need guarantee to realize storage capacitance Cst is carried out to discharge operation.
So, in one embodiment, as shown in Figure 6, the second switch unit 2 that the utility model embodiment is related, specifically can comprise:
The second thin-film transistor T2;
The source electrode of the second thin-film transistor T2 and grid, be connected with the 4th signal input part IN4, and the drain electrode of the second thin-film transistor is connected with the first end of storage capacitance Cst.
Because common discharge signal is a low level signal, therefore, the second thin-film transistor T2 that the utility model embodiment is related, specifically can be P type thin-film transistor, to realize the control of discharge of low level conducting, high level cut-off.
And in another specific embodiment of the present utility model, as shown in Figure 7, the related second switch unit 2 of the utility model embodiment specifically can comprise:
The second piezo-resistance RV2;
The first end of the second piezo-resistance RV2 is connected with the 4th signal input part IN4, and the second end of the second piezo-resistance RV2 is connected with the first end of storage capacitance Cst.
Equally, because common discharge signal is a low level signal, therefore, the second related piezo-resistance RV2 of the utility model embodiment specifically can be negative temperature coefficient piezo-resistance.
By the setting of above-mentioned device, can realize the performed function of image element circuit that the utility model embodiment provides, still, the image element circuit that the utility model embodiment provides also not only comprises above device, when concrete application, can also comprise other devices such as threshold voltage compensation circuit.
The utility model embodiment also provides a kind of driving method of image element circuit, and as shown in Figure 8, the method specifically can comprise:
Step 81, determines the demonstration greyscale level of the current display frame of image element circuit place pixel cell;
Step 82, based on showing greyscale level, is defined as the very first time of storage capacitance Cst charging in image element circuit, and the very first time is corresponding with demonstration greyscale level;
Step 83, in the charging stage, the first signal input IN1 in image element circuit inputs the charging signals I that continues very first time t1
data, wherein, the first switch element 1 in image element circuit can be at charging signals I
dataeffect under in conducting state, so that charging signals I
datato the storage capacitance Cst charging very first time, make storage capacitance Cst reach the first electric weight, storage capacitance Cst is in the time of the first electric weight, and the Organic Light Emitting Diode OLED in image element circuit is corresponding with described demonstration greyscale level at the luminosity of glow phase.
In one embodiment, the pixel circuit drive method that the utility model embodiment provides, specifically can also comprise:
At discharge regime, the first signal input IN1 in image element circuit inputs discharge signal, and wherein, the first switch element 1 can be in conducting state under discharge signal control, so that discharge signal is storage capacitance Cst electric discharge; Or,
At discharge regime, the 4th signal input part IN4 in image element circuit inputs discharge signal, and wherein, second switch unit 2 can be in conducting state under discharge signal control, so that discharge signal is storage capacitance Cst electric discharge.
In one embodiment, the pixel circuit drive method that the utility model embodiment provides, as shown in Figure 9, specifically can also comprise::
Step 91, determines demonstration greyscale level quantity included in a frame picture and pixel cell corresponding to each demonstration greyscale level;
Step 92, determines that each shows charging interval corresponding to greyscale level, and the positional information of pixel cell;
Step 93, by a preset order, shows pixel cell corresponding to greyscale level to difference successively, sends the charging signals that continues the corresponding charging interval, shows that pixel cell corresponding to greyscale level is luminous successively within the frame picture disply time so that correspondence is different.
The image element circuit providing based on the utility model embodiment, the utility model embodiment also provides a kind of organic electroluminescence display panel, and this organic electroluminescence display panel specifically can comprise the image element circuit that above-mentioned the utility model embodiment provides.
The utility model embodiment also provides a kind of display unit, and this display unit specifically can comprise the organic electroluminescence display panel that above-mentioned the utility model embodiment provides.
This display unit is specifically as follows the display unit such as liquid crystal panel, LCD TV, liquid crystal display, oled panel, OLED display, plasma display or Electronic Paper.
Image element circuit described in the utility model, organic electroluminescence display panel and display unit are particularly suitable for LTPS(low temperature polycrystalline silicon technology) GOA circuit requirements under processing procedure, also applicable to the GOA circuit under amorphous silicon technology.
Be pointed out that, the image element circuit that the utility model embodiment provides is applicable to the thin-film transistor of the techniques such as amorphous silicon, polysilicon, oxide., although in above-described embodiment, be illustrated as an example of thin-film transistor example, but foregoing circuit can also adopt CMOS pipe circuit easily instead meanwhile.And, although be illustrated as an example of active matrix organic light-emitting diode example in above-described embodiment, but the utility model is not limited to use the display unit of active matrix organic light-emitting diode, also can be applied to the display unit that uses other various light-emitting diodes.
Can find out from the above, image element circuit, organic electroluminescence display panel and display unit that the utility model embodiment provides, by arranging in image element circuit: first signal input, for receive the charging signals that continues the very first time in the charging stage; The first switch element, be connected between described storage capacitance first end and described first signal input, described the first switch element can be in conducting state under the control of the charging signals of the described lasting very first time, so that described charging signals charges the described very first time to described storage capacitance, make described storage capacitance reach the first electric weight; Wherein, the described very first time and one shows that greyscale level is corresponding, and described storage capacitance is in the time of described the first electric weight, and described Organic Light Emitting Diode is corresponding with described demonstration greyscale level at the luminosity of glow phase.Thereby can simplify image element circuit structure composition and driving process, reduce drive circuit board hardware designs difficulty, reduce the area of drive circuit board, make display floater and display unit reach the effect of lightness.
The above is only execution mode of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (13)
1. an image element circuit, comprising: driving transistors, storage capacitance, Organic Light Emitting Diode, it is characterized in that, and described image element circuit also comprises:
First signal input, for receiving the charging signals that continues the very first time in the charging stage;
The first switch element, be connected between the first end and described first signal input of described storage capacitance, described the first switch element can be in conducting state under the control of the charging signals of the described lasting very first time, so that described charging signals charges the described very first time to described storage capacitance, make described storage capacitance reach the first electric weight;
Wherein, the described very first time and one shows that greyscale level is corresponding, and described storage capacitance is in the time of described the first electric weight, and described Organic Light Emitting Diode is corresponding with described demonstration greyscale level at the luminosity of glow phase.
2. image element circuit as claimed in claim 1, is characterized in that, the source electrode of described driving transistors connects secondary signal input;
The grid of described driving transistors is connected with the first end of described storage capacitance;
The second end of the drain electrode of described driving transistors and described storage capacitance, the anodic bonding of described Organic Light Emitting Diode;
The negative electrode of described Organic Light Emitting Diode is connected with the 3rd signal input part.
3. image element circuit as claimed in claim 1, is characterized in that, described charging signals is the signal with default duty ratio, and described default duty ratio determines the described very first time.
4. image element circuit as claimed in claim 1, is characterized in that, described the first switch element comprises the first film transistor;
The transistorized source electrode of described the first film and grid, be connected with described first signal input, and the transistorized drain electrode of described the first film is connected with the first end of described storage capacitance.
5. image element circuit as claimed in claim 1, is characterized in that, described the first switch element comprises the first piezo-resistance;
The first end of described the first piezo-resistance is connected with described first signal input, and the second end of described the first piezo-resistance is connected with the first end of described storage capacitance.
6. image element circuit as claimed in claim 5, is characterized in that, described the first piezo-resistance is positive temperature coefficient piezo-resistance.
7. the image element circuit as described in claim 1 to 6 any one, is characterized in that, described first signal input, also for receiving the discharge signal of second time of continuing at discharge regime;
Described the first switch element can be in conducting state, so that described discharge signal discharges described the second time to described storage capacitance under the control of the described discharge signal that continued for the second time.
8. image element circuit as claimed in claim 1, is characterized in that, also comprises:
The 4th signal input part, for receiving the discharge signal of second time of continuing at discharge regime;
Second switch unit, be connected between the first end and described the 4th signal input part of described storage capacitance, described second switch unit can be in conducting state under the control of described discharge signal, so that described discharge signal discharges described the second time to described storage capacitance.
9. image element circuit as claimed in claim 8, is characterized in that, described second switch unit comprises the second thin-film transistor;
The source electrode of described the second thin-film transistor and grid, be connected with described the 4th signal input part, and the drain electrode of described the second thin-film transistor is connected with the first end of described storage capacitance.
10. image element circuit as claimed in claim 8, is characterized in that, described second switch unit comprises the second piezo-resistance;
The first end of described the second piezo-resistance is connected with described the 4th signal input part, and the second end of described the second piezo-resistance is connected with the first end of described storage capacitance.
11. image element circuits as claimed in claim 10, is characterized in that, described the second piezo-resistance is negative temperature coefficient piezo-resistance.
12. 1 kinds of organic electroluminescence display panels, is characterized in that, comprise the image element circuit of described claim 1-11 any one.
13. 1 kinds of display unit, is characterized in that, comprise organic electroluminescence display panel as claimed in claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420125431.6U CN203746857U (en) | 2014-03-19 | 2014-03-19 | Pixel circuit, organic light-emitting display panel and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420125431.6U CN203746857U (en) | 2014-03-19 | 2014-03-19 | Pixel circuit, organic light-emitting display panel and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203746857U true CN203746857U (en) | 2014-07-30 |
Family
ID=51346620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420125431.6U Expired - Lifetime CN203746857U (en) | 2014-03-19 | 2014-03-19 | Pixel circuit, organic light-emitting display panel and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203746857U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103903564A (en) * | 2014-03-19 | 2014-07-02 | 京东方科技集团股份有限公司 | Pixel circuit, driving method of pixel circuit, organic light-emitting display panel and display device |
| CN105304020A (en) * | 2015-11-23 | 2016-02-03 | 武汉天马微电子有限公司 | Pixel drive circuit of organic light-emitting diode, array substrate and display device |
| CN106339128A (en) * | 2016-08-30 | 2017-01-18 | 武汉华星光电技术有限公司 | Method for improving display effect of embedded touch screen, and embedded touch screen |
| CN109272938A (en) * | 2018-11-23 | 2019-01-25 | 京东方科技集团股份有限公司 | Display screen, pixel circuit unit and its control method |
| CN112652270A (en) * | 2020-12-28 | 2021-04-13 | 上海天马有机发光显示技术有限公司 | Pixel circuit, display panel and display device |
-
2014
- 2014-03-19 CN CN201420125431.6U patent/CN203746857U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103903564A (en) * | 2014-03-19 | 2014-07-02 | 京东方科技集团股份有限公司 | Pixel circuit, driving method of pixel circuit, organic light-emitting display panel and display device |
| CN105304020A (en) * | 2015-11-23 | 2016-02-03 | 武汉天马微电子有限公司 | Pixel drive circuit of organic light-emitting diode, array substrate and display device |
| CN106339128A (en) * | 2016-08-30 | 2017-01-18 | 武汉华星光电技术有限公司 | Method for improving display effect of embedded touch screen, and embedded touch screen |
| CN109272938A (en) * | 2018-11-23 | 2019-01-25 | 京东方科技集团股份有限公司 | Display screen, pixel circuit unit and its control method |
| CN112652270A (en) * | 2020-12-28 | 2021-04-13 | 上海天马有机发光显示技术有限公司 | Pixel circuit, display panel and display device |
| CN112652270B (en) * | 2020-12-28 | 2021-11-23 | 武汉天马微电子有限公司 | Pixel circuit, display panel and display device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3389037B1 (en) | Pixel circuit of display panel | |
| CN103903564A (en) | Pixel circuit, driving method of pixel circuit, organic light-emitting display panel and display device | |
| CN104112427B (en) | Image element circuit and its driving method and display device | |
| CN102651194B (en) | Voltage driving pixel circuit, driving method thereof and display panel | |
| CN203746857U (en) | Pixel circuit, organic light-emitting display panel and display device | |
| US9324271B2 (en) | Pixel driver | |
| CN103400548B (en) | Pixel-driving circuit and driving method, display device | |
| CN104036725A (en) | Pixel circuit and driving method, organic light emitting display panel and display device thereof | |
| CN103745685B (en) | Active matric organic LED panel driving circuit and driving method | |
| CN110544452B (en) | Power supply time sequence control circuit and control method, display driving circuit and display device | |
| CN104064140A (en) | Pixel circuit, drive method of pixel circuit, organic light-emitting display panel and display device | |
| CN105118438A (en) | Pixel drive circuit and method, pixel circuit, and display device | |
| CN102646387A (en) | Shift register and line-scanning driving circuit | |
| CN103247261A (en) | External compensation induction circuit, induction method of external compensation induction circuit and display device | |
| CN103500556A (en) | Pixel circuit, pixel circuit driving method and thin film transistor backplane | |
| CN203480803U (en) | Pixel circuit, display panel, and display device | |
| CN106782322A (en) | AMOLED pixel-driving circuits and AMOLED image element driving methods | |
| CN203858845U (en) | Pixel circuit, organic light-emitting display panel and display device | |
| WO2021203497A1 (en) | Pixel driving circuit and display panel | |
| CN101859542A (en) | Organic light emitting diode display device and organic light emitting diode pixel circuit thereof | |
| CN102708789A (en) | Pixel unit driving circuit and method, pixel unit and display device | |
| CN102956185A (en) | Pixel circuit and display device | |
| CN103325339A (en) | Pixel circuit, pixel circuit driving method, organic light-emitting display panel and display device | |
| CN105679243A (en) | Amoled pixel driving circuit and pixel driving method | |
| CN102298893B (en) | Source electrode driving circuit and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140730 |
|
| CX01 | Expiry of patent term |