CN203858846U - Pixel circuit, organic light-emitting display panel and display device - Google Patents
Pixel circuit, organic light-emitting display panel and display device Download PDFInfo
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- CN203858846U CN203858846U CN201420283019.7U CN201420283019U CN203858846U CN 203858846 U CN203858846 U CN 203858846U CN 201420283019 U CN201420283019 U CN 201420283019U CN 203858846 U CN203858846 U CN 203858846U
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Abstract
本实用新型提供了一种像素电路、有机发光显示面板及显示装置，该像素电路包括：显示驱动模块，用于在一时间周期内，在第一扫描线输入的第一扫描信号、第二扫描线输入的第二扫描信号、控制线输入的控制信号的控制下，利用数据线输入的数据信号和第二信号源输入的第二信号进行驱动晶体管阈值电压补偿处理，使得在所述时间周期的第三阶段，有机发光二极管的发光驱动信号与驱动晶体管阈值电压无关；电容触控侦测模块，用于在所述时间周期内，在第一扫描信号、控制信号的控制下，侦测触摸屏的触摸信号。从而提高显示装置的图像显示效果，实现显示驱动和触控侦测的高效整合。
The utility model provides a pixel circuit, an organic light-emitting display panel and a display device. The pixel circuit includes: a display driving module, which is used to input the first scanning signal and the second scanning signal on the first scanning line within a time period. Under the control of the second scan signal input by the line and the control signal input by the control line, the threshold voltage compensation process of the drive transistor is performed by using the data signal input by the data line and the second signal input by the second signal source, so that in the time period In the third stage, the light-emitting driving signal of the organic light emitting diode has nothing to do with the threshold voltage of the driving transistor; the capacitive touch detection module is used to detect the touch screen under the control of the first scanning signal and the control signal Touch signal. Therefore, the image display effect of the display device is improved, and the efficient integration of display driving and touch detection is realized.
Description
Technical field
The utility model relates to display technique field, is specifically related to a kind of image element circuit, organic electroluminescence display panel and display device.
Background technology
Organic light emitting display (AMOLED) is one of focus of current flat-panel monitor research field, compare with liquid crystal display, the advantages such as Organic Light Emitting Diode (OLED) has that low energy consumption, production cost are low, autoluminescence, wide visual angle and fast response time, at present, at demonstration field OLED such as mobile phone, PDA, digital cameras, started to replace traditional LCDs (LCD).Pixel-driving circuit design is AMOLED display core technology content, has important Research Significance.
Utilize stable Control of Voltage brightness different from TFT-LCD, OLED belongs to current drives, needs stable electric current to control luminous.Due to reasons such as manufacturing process and device agings, the threshold voltage (Vth) of the driving thin film transistor (TFT) of each pixel can drift about, with regard to the electric current that caused flowing through each pixel OLED, the variation because of threshold voltage changes like this, make display brightness uneven, thereby affect the display effect of whole image.
In the LCD display that touch-control built-in (In cell touch) technology has been applied at present, the built-in technology of capacitance touching control that comprises of comparatively commonly using, and the most scabrous technical matters of the built-in technology of capacitance touching control is exactly signal interference problem at present, while being touch-control electrode and LCD work, between required electrode, there is sizable stray capacitance separately, therefore be difficult to overcome when collecting touching signals smoothly, can not have influence on again the display characteristic of LCD itself.
So if the built-in technology of capacitance touching control and AMOLED can be integrated, will certainly be in the direction of demonstration in future field development.
Utility model content
The utility model provides a kind of image element circuit, organic electroluminescence display panel and display device, the impact of the threshold voltage that not only can eliminate driving transistors on luminous driving signal, thereby improve the homogeneity of organic electroluminescence display panel brightness, improve the image display effect of display device, can also be when realizing display driver, realize touch detection, thereby realize the high effective integration of display driver and touch detection.
The utility model provides scheme as follows:
The utility model embodiment provides a kind of image element circuit, comprises the first memory capacitance, driving transistors and Organic Light Emitting Diode, and the grid of described driving transistors is connected with first memory capacitance the second end;
It is characterized in that, described image element circuit also comprises:
Driver module, respectively with the first sweep trace, the second sweep trace, control line, data line, first signal source, secondary signal source connects, for within a time cycle, the first sweep signal in the first sweep trace input, the second sweep signal of the second sweep trace input, under the control of the control signal of control line input, utilize the data-signal of data line input and the secondary signal of secondary signal source input to carry out drive transistor threshold voltage compensation deals, make the phase III in the described time cycle, the luminous driving signal of Organic Light Emitting Diode and drive transistor threshold voltage are irrelevant,
Capacitance touching control detecting module, is connected with the first sweep trace, control line, data line, the 3rd signal source, signal read line respectively, within the described time cycle, and under the control of the first sweep signal, control signal, the touch signal of detecting touch-screen.
Preferably, described driver module comprises:
Reset cell, is connected with first signal source, control line and the first memory capacitance first end respectively, for the first stage in the described time cycle, the current potential of the first memory capacitance first end is reset to the current potential of first signal;
The first charhing unit, be connected with the first sweep trace, data line, driving transistors, first memory capacitance the second end respectively, subordinate phase in the described time cycle, charges to the current potential of data-signal and the difference of drive transistor threshold voltage by the current potential of first memory capacitance the second end;
Compensation drive unit, be connected with the second sweep trace, data line, secondary signal source, the first memory capacitance first end, driving transistors respectively, for the phase III in the described time cycle, the current potential that the current potential of controlling the first memory capacitance first end is data-signal, the jump in potential that makes first memory capacitance the second end is the current potential of 2 haplotype data signals, difference with drive transistor threshold voltage, to define the luminous driving signal of OLED based on secondary signal and data-signal, and utilize described luminous drive Organic Light Emitting Diode luminous.
Preferably, described reset cell comprises:
The first film transistor;
The transistorized source electrode of the first film is connected with first signal source, and the transistorized grid of the first film is connected with control line, and the transistorized drain electrode of the first film is connected with the first memory capacitance first end.
Preferably, described the first charhing unit comprises:
The second thin film transistor (TFT) and the 3rd thin film transistor (TFT), wherein:
The source electrode of the second thin film transistor (TFT) is connected with data line, and the grid of the second thin film transistor (TFT) is connected with the first sweep trace, and the drain electrode of the second thin film transistor (TFT) is connected with the source electrode of driving transistors;
The 3rd source electrode of thin film transistor (TFT) and the drain electrode of driving transistors are connected, and the grid of the 3rd thin film transistor (TFT) is connected with the first sweep trace, and the drain electrode of the 3rd thin film transistor (TFT) is connected with first memory capacitance the second end.
Preferably, described compensation drive unit comprises:
The 4th thin film transistor (TFT), the 5th thin film transistor (TFT), the 6th thin film transistor (TFT);
The source electrode of the 4th thin film transistor (TFT) is connected with secondary signal source, and the grid of the 4th thin film transistor (TFT) is connected with the second sweep trace, and the 4th drain electrode of thin film transistor (TFT) and the source electrode of driving transistors are connected;
The 5th source electrode of thin film transistor (TFT) and the drain electrode of driving transistors are connected, and the grid of the 5th thin film transistor (TFT) is connected with the second sweep trace, the 5th drain electrode of thin film transistor (TFT) and the anodic bonding of Organic Light Emitting Diode;
The source electrode of the 6th thin film transistor (TFT) is connected with data line, and the grid of the 6th thin film transistor (TFT) is connected with the second sweep trace, and the drain electrode of the 6th thin film transistor (TFT) is connected with the first memory capacitance first end.
Preferably, described capacitance touching control detecting module comprises the second memory capacitance, the second charhing unit, transmission unit; Wherein:
The second charhing unit, is connected with data line, control line, second memory capacitance the second end respectively, for the first stage in the described time cycle, the current potential of second memory capacitance the second end is charged to the current potential of data-signal;
Transmission unit, be connected with the 3rd signal source, the second memory capacitance, the first sweep trace, signal read line respectively, for the subordinate phase in the described time cycle, when touch-screen is under the state of being touched, the 3rd signal of the 3rd signal source input is transferred to signal read line, so that the processor being connected with signal read line is determined the positional information of touch operation.
Preferably, described the second charhing unit comprises:
Charging transistor;
The source electrode of charging transistor is connected with data line, and the grid of charging transistor is connected with control line, and the drain electrode of charging transistor is connected with second memory capacitance the second end.
Preferably, described transmission unit comprises:
Amplifier transistor and switching transistor;
The source electrode of amplifier transistor is connected with the second memory capacitance first end, the 3rd signal source respectively, and the grid of amplifier transistor is connected with second memory capacitance the second end, and the drain electrode of amplifier transistor is connected with the source electrode of switching transistor;
The grid of switching transistor is connected with the first sweep trace, and the drain electrode of switching transistor is connected with signal read line.
Preferably, described transistor is P transistor npn npn;
First signal is low level signal or zero potential signal;
Secondary signal is high level signal;
The 3rd signal is coupling pulse signal.
The utility model embodiment also provides a kind of organic electroluminescence display panel, comprises the image element circuit that above-mentioned the utility model embodiment provides.
The utility model embodiment also provides a kind of display device, comprises the organic electroluminescence display panel that above-mentioned the utility model embodiment provides.
From the above, can find out, the image element circuit that the utility model provides, organic electroluminescence display panel and display device, this image element circuit comprises: driver module, respectively with the first sweep trace, the second sweep trace, control line, data line, first signal source, secondary signal source connects, for within a time cycle, the first sweep signal in the first sweep trace input, the second sweep signal of the second sweep trace input, under the control of the control signal of control line input, utilize the data-signal of data line input and the secondary signal of secondary signal source input to carry out drive transistor threshold voltage compensation deals, make the phase III in the described time cycle, the luminous driving signal of Organic Light Emitting Diode and drive transistor threshold voltage are irrelevant, capacitance touching control detecting module, is connected with the first sweep trace, control line, data line, the 3rd signal source, signal read line respectively, within the described time cycle, and under the control of the first sweep signal, control signal, the touch signal of detecting touch-screen.Thereby the impact of the threshold voltage that not only can eliminate driving transistors on luminous driving signal, improve the homogeneity of organic electroluminescence display panel brightness, improve the image display effect of display device, can also be when realizing display driver, realize touch detection, realize the high effective integration of display driver and touch detection.
Accompanying drawing explanation
The image element circuit structure schematic diagram one that Fig. 1 provides for the utility model embodiment;
The image element circuit structure schematic diagram two that Fig. 2 provides for the utility model embodiment;
The image element circuit structure schematic diagram three that Fig. 3 provides for the utility model embodiment;
The image element circuit that Fig. 4 provides for the utility model embodiment is realized touch detection schematic diagram one;
The image element circuit that Fig. 5 provides for the utility model embodiment is realized touch detection schematic diagram two;
The image element driving method schematic flow sheet one that Fig. 6 provides for the utility model embodiment;
The image element driving method schematic flow sheet two that Fig. 7 provides for the utility model embodiment;
The related signal timing diagram schematic diagram of image element driving method that Fig. 8 provides for the utility model embodiment;
The image element circuit that Fig. 9 provides for the utility model embodiment is in first stage view one;
The image element circuit that Figure 10 provides for the utility model embodiment is in subordinate phase view two;
The image element circuit that Figure 11 provides for the utility model embodiment is in phase III view three.
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, rather than whole embodiment.Based on described embodiment of the present utility model, the every other embodiment that those of ordinary skills 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 " of using in the utility model patent application specification and claims, " second " and similar word do not represent any order, quantity or importance, and are just used for distinguishing different ingredients.Equally, the similar words such as " " or " " do not represent restricted number yet, and mean and have 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 utility model embodiment provides a kind of image element circuit, as shown in Figure 1, comprises the first memory capacitance Cs1, driving transistors DTFT and Organic Light Emitting Diode OLED, and wherein, the grid of driving transistors DTFT is connected with first memory capacitance Cs1 the second end;
This image element circuit specifically can also comprise:
Driver module 1, is connected with the first sweep trace Scan1, the second sweep trace Scan2, control line EM, data line, first signal source, secondary signal source respectively, within a time cycle, at the first sweep signal V of the first sweep trace Scan1 input
scan1, the second sweep trace Scan2 input the second sweep signal V
scan2, control line EM input control signal V
eMcontrol under, utilize the data-signal V of data line input
datasecondary signal V with the input of secondary signal source
ddcarry out driving transistors DTFT threshold voltage V
thcompensation deals, make the phase III in the described time cycle, the luminous driving signal of Organic Light Emitting Diode OLED and driving transistors DTFT threshold voltage V
thirrelevant;
Capacitance touching control detecting module 2, is connected with the first sweep trace Scan1, control line EM, data line, the 3rd signal source, signal read line (Read Line) respectively, within the described time cycle, at the first sweep signal V
scan1, control signal V
eMcontrol under, detecting touch-screen touch signal.
The image element circuit that the utility model embodiment provides, not only can eliminate the threshold voltage V of driving transistors DTFT
thimpact on luminous driving signal, thereby improve the homogeneity of organic electroluminescence display panel brightness, improve the image display effect of display device, can also be when realizing display driver, realize touch detection, thereby realize the high effective integration of display driver and touch detection.
In the utility model embodiment, as shown in Figure 1, Organic Light Emitting Diode OLED negative electrode can be connected with first signal source.
The related first signal source of above-mentioned the utility model embodiment is used for inputting first signal, described first signal specifically can be low level signal or zero potential signal, be in the utility model embodiment, first signal source specifically can be low level signal and produces device, also can be connected with transmission line or the ground of transmission low level signal.
And the related secondary signal V of the utility model embodiment
ddspecifically can be high level signal,, in the utility model embodiment, secondary signal source specifically can be high level signal and produces device, also can be connected with the transmission line of transmission high level signal.
In one embodiment, as shown in Figure 2, the related driver module 1 of the utility model embodiment specifically can comprise:
Reset cell 11, is connected with first signal source, control line EM and the first memory capacitance Cs1 first end (being node A) respectively, for the first stage in the described time cycle, the current potential of the first memory capacitance Cs1 first end is reset to the current potential of first signal.
The first charhing unit 12, be connected with the first sweep trace Scan1, data line, driving transistors DTFT, first memory capacitance Cs1 the second end (being Node B) respectively, subordinate phase in the described time cycle, charges to data-signal V by the current potential of first memory capacitance Cs1 the second end
datacurrent potential and driving transistors DTFT threshold voltage V
thdifference, i.e. V
b2=V
data-V
th;
Compensation drive unit 13, be connected with the second sweep trace Scan2, data line, secondary signal source, the first memory capacitance Cs1 first end, driving transistors DTFT respectively, be used in the phase III of described time cycle, the current potential of controlling the first memory capacitance Cs1 first end is data-signal V
datacurrent potential, the jump in potential that makes first memory capacitance Cs1 the second end is 2 haplotype data signal V
datacurrent potential, with driving transistors DTFT threshold voltage V
thdifference, i.e. V
b3=2V
data-V
th, so that based on data-signal V
datawith secondary signal V
dddefine the luminous driving signal I of OLED
oLED, and utilize luminous driving signal I
oLEDdrive Organic Light Emitting Diode OLED luminous.
Because the current potential of first memory capacitance Cs1 the second end is the grid potential of driving transistors DTFT, and work as at phase III secondary signal V
ddinput under the source electrode state of driving transistors DTFT, by driving transistors DTFT saturation current formula, can be obtained:
I
OLED＝K(V
GS–V
th)
2
＝K[V
dd-(2V
data-V
th)-V
th]
2
＝K(V
dd-2V
data)
2
Wherein, V
gSfor driving thin film transistor (TFT) DTFT gate source voltage, be V
dd-(2V
data-V
th), K is and drives thin film transistor (TFT) DTFT production technology and drive the relevant constant of design.
So from above-mentioned formula, in the utility model embodiment, the driving signal of Organic Light Emitting Diode OLED and the threshold voltage V of driving transistors DTFT
thhave nothing to do, i.e. the drive current I of Organic Light Emitting Diode OLED
oLEDonly with secondary signal V
ddwith data-signal V
datarelevant, thus the threshold voltage V of driving transistors DTFT can be eliminated
thimpact on luminous driving signal, has thoroughly solved driving transistors DTFT because manufacturing process and long-time operation cause threshold voltage V
ththe problem of drift, ensures the normal work of OLED OLED.And in the organic electroluminescence display panel secondary signal V of all pixel cells
ddwith data-signal V
datawhen identical, can improve the homogeneity of organic electroluminescence display panel brightness, improve the image display effect of display device.
In the utility model one specific embodiment, as shown in Figure 3, reset cell 11 specifically can comprise:
The first film transistor T 1;
The source electrode of the first film transistor T 1 is connected with first signal source, and the grid of the first film transistor T 1 is connected with control line EM, and the drain electrode of the first film transistor T 1 is connected with the first memory capacitance Cs1 first end (node A).
In the utility model one specific embodiment, as shown in Figure 3, the first charhing unit 12 specifically can comprise:
The second thin film transistor (TFT) T2 and the 3rd thin film transistor (TFT) T3, wherein:
The source electrode of the second thin film transistor (TFT) T2 is connected with data line, and the grid of the second thin film transistor (TFT) T2 is connected with the first sweep trace Scan1, and the drain electrode of the second thin film transistor (TFT) T2 is connected with the source electrode of driving transistors DTFT;
The source electrode of the 3rd thin film transistor (TFT) T3 is connected with the drain electrode of driving transistors DTFT, and the grid of the 3rd thin film transistor (TFT) T3 is connected with the first sweep trace Scan1, and the drain electrode of the 3rd thin film transistor (TFT) T3 is connected with first memory capacitance Cs1 the second end (Node B).
In the utility model one specific embodiment, as shown in Figure 3, compensation drive unit 13 specifically can comprise:
The 4th thin film transistor (TFT) T4, the 5th thin film transistor (TFT) T5, the 6th thin film transistor (TFT) T6;
The source electrode of the 4th thin film transistor (TFT) T4 is connected with secondary signal source, and the grid of the 4th thin film transistor (TFT) T4 is connected with the second sweep trace Scan2, and the drain electrode of the 4th thin film transistor (TFT) T4 is connected with the source electrode of driving transistors DTFT;
The source electrode of the 5th thin film transistor (TFT) T5 is connected with the drain electrode of driving transistors DTFT, and the grid of the 5th thin film transistor (TFT) T5 is connected with the second sweep trace Scan2, the anodic bonding of the drain electrode of the 5th thin film transistor (TFT) T5 and Organic Light Emitting Diode OLED;
The source electrode of the 6th thin film transistor (TFT) T6 is connected with data line, and the grid of the 6th thin film transistor (TFT) T6 is connected with the second sweep trace Scan2, and the drain electrode of the 6th thin film transistor (TFT) T6 is connected with the first memory capacitance Cs1 first end.
In one embodiment, as shown in Figure 2, the related capacitance touching control detecting module 2 of the utility model embodiment specifically can comprise: the second memory capacitance Cs2, the second charhing unit 21, transmission unit 22; Wherein:
The second charhing unit 21, is connected with data line, control line EM, second memory capacitance Cs2 the second end (being node D) respectively, for the first stage in the described time cycle, the current potential of second memory capacitance Cs2 the second end is charged to data-signal V
datacurrent potential.
Transmission unit 22, be connected with the 3rd signal source, the second memory capacitance Cs2, the first sweep trace Scan1, signal read line (Read Line) respectively, for the subordinate phase in the described time cycle, when touch-screen is under the state of being touched, by the 3rd signal V of the 3rd signal source input
cPtransfer to signal read line, so that the processor (not shown) being connected with signal read line is determined the positional information of touch operation.
In the utility model one specific embodiment, as shown in Figure 3, the second charhing unit 21 specifically can comprise:
Charging transistor M1;
The source electrode of charging transistor M1 is connected with data line, and the grid of charging transistor M1 is connected with control line EM, and the drain electrode of charging transistor M1 is connected with second memory capacitance Cs2 the second end (node D).
In the utility model one specific embodiment, as shown in Figure 3, transmission unit 22 specifically can comprise:
Amplifier transistor M2 and switching transistor M3;
The source electrode of amplifier transistor M2 is connected with the second memory capacitance Cs2 first end (node C), the 3rd signal source respectively, the grid of amplifier transistor M2 is connected with second memory capacitance Cs2 the second end, and the drain electrode of amplifier transistor M2 is connected with the source electrode of switching transistor M3;
The grid of switching transistor M3 is connected with the first sweep trace Scan1, and the drain electrode of switching transistor M3 is connected with signal read line.
In the utility model embodiment, the 3rd signal V of the 3rd signal source input
cP, specifically can be coupling pulse signal (coupling pulse signal).
So, in the utility model embodiment, in related first stage, when charging transistor M1 (i.e. the second charhing unit 21) is under conducting state, charging transistor M1 is by the data-signal V of data line transmission
datathe second end that transfers to the second memory capacitance Cs2 is node D, thereby make the current potential of node D, is data-signal V
datacurrent potential.
In the utility model embodiment, node D can be an electrode tip (as shown in the square frame around of node D in Fig. 3) of the second memory capacitance Cs2, when touch objects (as finger, felt pen etc.) contact touch-screen, and as shown in Figure 4,5, can produce coupling capacitance Cf with node D, and cause the current potential of node D to reduce.
It is worth mentioning that, in subordinate phase, the 3rd signal V
cPthe pulse signal that is coupled, is that the first end of the second memory capacitance Cs2 is that node C provides voltage on the one hand, so that the second end of the second memory capacitance Cs2 is that the jump in potential of node D is to V
data+ V
cP, the effect of another aspect is to serve as the source electrode that touch detection signal transfers to amplifier transistor M2, thereby when transmission unit 22 is during in conducting state, the 3rd signal V
cPcan be transferred to signal read line, so that processor is determined touching position information.
As can see from Figure 5, the touch-control of touch objects directly causes grid (the being node D) current potential of amplifier transistor M2 to reduce, when the gate source voltage of amplifier transistor M2 meets the turn-on condition of amplifier transistor M2, amplifier transistor M2 is in conducting state, thereby makes the 3rd signal V
cPby amplifier transistor M2.The process that node D current potential declines so, is the buffer stage of capacitance touching control detecting module 2, " wait for " that amplifier transistor M2 grid potential reduces, and the main inducing reducing is exactly that touch operation has occurred touch-screen.When the potential drop of node D is low to moderate the condition that has reached amplifier transistor M2 conducting, amplifier transistor M2 can and amplify the signal conduction of coupling pulse as amplifying TFT.
Why amplify the 3rd signal V
cP, be also in order to contribute to processor for the collection of touch signal.
When processor collects the signal that transmitted by signal read line (i.e. the 3rd signal V
cP) time, can determine based on signal read line longitudinal (Y-direction) coordinate of touch location, and based on the output point of the first sweep trace Scan1 now, as horizontal (directions X) coordinate of touch location.So just determined X, the Y coordinate of touch location, with this, determined that the positional information touching occurs touch-screen.
So visible, touch signal circuit for detecting that can integrated internally-arranged type touch-screen in the pixel cell providing due to the utility model embodiment, in display driver, realize the detecting of touch control operation, thereby realize pixel-driving circuit and the integrated setting of touch signal circuit for detecting, thereby realize the high effective integration of display driver and touch detection.Such circuit structure setting, can realize internally-arranged type touch-screen and Organic Light Emitting Diode and drive show integrated, is conducive to reduce thickness and the weight of display panel, and can reduces the cost of display panel.
The related transistor of above-mentioned the utility model embodiment, comprises driving transistors DTFT, T1-T6, M1-M3, all can be P transistor npn npn, thereby can make to reduce the manufacturing process of organic display panel.
It is a kind of for driving the image element driving method of the image element circuit that above-mentioned the utility model embodiment provides that the utility model embodiment also provides, and the method specifically can comprise:
Within a time cycle, at the first sweep signal V of the first sweep trace Scan1 input
scan1, the second sweep trace Scan2 input the second sweep signal V
scan2, control line EM input control signal V
eMcontrol under, utilize the data-signal V of data line input
datasecondary signal V with the input of secondary signal source
ddcarry out driving transistors DTFT threshold voltage V
thcompensation deals, make the phase III in the described time cycle, the luminous driving signal of Organic Light Emitting Diode OLED and driving transistors DTFT threshold voltage V
thirrelevant; And within the described time cycle, at the first sweep signal V
scan1, control signal V
eMunder control, the touch signal of detecting touch-screen.
The image element circuit that the utility model embodiment provides, not only can eliminate the threshold voltage V of driving transistors DTFT
thimpact on luminous driving signal, thereby improve the homogeneity of organic electroluminescence display panel brightness, improve the image display effect of display device, can also be when realizing display driver, realize touch detection, thereby realize the high effective integration of display driver and touch detection.
In the utility model one embodiment, as shown in Figure 6, the process of display driver specifically can comprise:
In the first stage of described time cycle, reset cell 11 resets to the current potential of the first memory capacitance Cs1 first end the current potential of first signal;
In the subordinate phase of described time cycle, the first charhing unit 12 charges to data-signal V by the current potential of first memory capacitance Cs1 the second end
datacurrent potential and driving transistors DTFT threshold voltage V
thdifference;
In the phase III of described time cycle, the current potential that compensation drive unit 13 is controlled the first memory capacitance Cs1 first end is data-signal V
datacurrent potential, the jump in potential that makes first memory capacitance Cs1 the second end is 2 haplotype data signal V
datacurrent potential, with driving transistors DTFT threshold voltage V
thdifference so that based on data-signal V
datawith secondary signal V
dddefine the luminous driving signal I of OLED
oLED, and utilize luminous driving signal I
oLEDdrive Organic Light Emitting Diode OLED luminous.
So visible, in the utility model embodiment, the driving signal of Organic Light Emitting Diode OLED and the threshold voltage V of driving transistors DTFT
thirrelevant, thus the threshold voltage V of driving transistors DTFT can be eliminated
thimpact on luminous driving signal, improves the homogeneity of organic electroluminescence display panel brightness, improves the image display effect of display device.
In the utility model one embodiment, as shown in Figure 7, the process of touch detection specifically can comprise:
In the first stage of described time cycle, the second charhing unit 21 charges to data-signal V by the current potential of second memory capacitance Cs2 the second end
datacurrent potential;
In the subordinate phase of described time cycle, transmission unit 22 is under touch-screen is touched state, by the 3rd signal V of the 3rd signal source input
cPtransfer to signal read line, so that the processor (not shown) being connected with signal read line is determined the positional information of touch operation.
So visible, touch signal circuit for detecting that can integrated internally-arranged type touch-screen in the pixel cell providing due to the utility model embodiment, in display driver, realize the detecting of touch control operation, thereby realize pixel-driving circuit and the integrated setting of touch signal circuit for detecting, thereby realize the high effective integration of display driver and touch detection.Such circuit structure setting, can realize internally-arranged type touch-screen and Organic Light Emitting Diode and drive show integrated, is conducive to reduce thickness and the weight of display panel, and can reduces the cost of display panel.
Below, the image element driving method providing with the utility model embodiment, the image element circuit being applied to is as shown in Figure 3 example, and the application process of this image element driving method specific embodiment is described in detail.
Signal input timing figure related in this embodiment can be as shown in Figure 8.And in this embodiment, first signal source is that ground is that first signal is zero potential signal.
The detailed process of this embodiment can comprise:
First stage:
In this stage, driver module 1 is in reset phase, and capacitance touching control detecting module 2 is in the charging stage.
The signal input schematic diagram in this stage is as 1 stage in accompanying drawing 8, i.e. control signal V
eM, the 3rd signal V
cPfor low level signal, the first sweep signal V
scan1, the second sweep signal V
scan2, data-signal V
datafor high level signal, thereby make the first film transistor T 1 (being reset cell 11) and charging transistor M1 (i.e. the second charhing unit 21) in conducting state; Make the second thin film transistor (TFT) T2 and the 3rd thin film transistor (TFT) T3 (i.e. the first charhing unit 12), the 4th thin film transistor (TFT) T4, the 5th thin film transistor (TFT) T5 and the 6th thin film transistor (TFT) T6 (being compensation drive unit 13), amplifier transistor M2 and switching transistor M3 (being transmission unit 22) are in cut-off state.
So in this stage, as shown in solid arrow in Fig. 9, because the first film transistor T 1 is in conducting state, therefore, it is node A that the first signal of first signal source input is transferred to the first memory capacitance Cs1 first end, because first signal is zero potential signal, therefore, it is V that the current potential that can be node A by the first memory capacitance Cs1 first end is discharged to zero potential
a1=0, thus the first memory capacitance Cs1 residual voltage signal impact on this time cycle within a upper time cycle can be eliminated, realize the current potential V of economize on electricity A in the first stage
a1replacement.
Meanwhile, as shown in Fig. 9 dotted arrow, because charging transistor M1 is in conducting state, therefore, the data-signal V of data line transmission
datatransferring to second memory capacitance Cs2 the second end is node D, thereby node D is charged to data-signal V
datacurrent potential.
Due to this phase data signal V
datafor high level signal, therefore, can make the amplifier transistor M2 of P type in cut-off state.
In this stage, as shown in Figure 8, in signal read line, there is no signal transmission.
Subordinate phase:
In this stage, driver module 1 is in the charging stage, and capacitance touching control detecting module 2 amplifies acquisition phase in touching signals.
The signal in this stage is inputted schematic diagram as 2 stages in accompanying drawing 8, i.e. the first sweep signal V
scan1for low level signal, control signal V
eM, the second sweep signal V
scan2, the 3rd signal V
cP, data-signal V
datafor high level signal, thereby make the second thin film transistor (TFT) T2 and the 3rd thin film transistor (TFT) T3 (i.e. the first charhing unit 12), switching transistor M3 is in conducting state, make the first film transistor T 1 (being reset cell 11), the 4th thin film transistor (TFT) T4, the 5th thin film transistor (TFT) T5 and the 6th thin film transistor (TFT) T6 (being compensation drive unit 13), charging transistor M1 (i.e. the second charhing unit 21) is in cut-off state.
In this stage, as shown in solid arrow in Figure 10, because the second thin film transistor (TFT) T2 and the 3rd thin film transistor (TFT) T3 are in conducting state, therefore, data-signal V
databy the second thin film transistor (TFT) T2, driving transistors DTFT, the 3rd thin film transistor (TFT) T3, by first memory capacitance Cs1 the second end, be that Node B charges to data-signal V successively
datacurrent potential and driving transistors DTFT threshold voltage V
thdifference, i.e. V
b2=V
data-V
th.
In subordinate phase, it is V that the current potential of node A is always zero
a2=0, so after charging is complete, the current potential of Node B can maintain V always
data-V
th, the pressure reduction that makes the first memory capacitance Cs1 two ends is V
data-V
th.
In addition, due in this stage, the 5th thin film transistor (TFT) T5, all the time in cut-off state, therefore can avoid electric current to pass through Organic Light Emitting Diode OLED, thereby can reduce the life consumption of Organic Light Emitting Diode OLED, extend the serviceable life of Organic Light Emitting Diode OLED.
If touch-screen generation touch operation in this stage, so as can see from Figure 5, the touch-control of touch objects directly causes grid (the being node D) current potential of amplifier transistor M2 to reduce, when the gate source voltage of amplifier transistor M2 meets the turn-on condition of amplifier transistor M2, amplifier transistor M2 is in conducting state, meanwhile, owing to being subject to the first sweep signal V
scan1control, switching transistor M3 is conducting state in this stage, so, as shown in dotted arrow in Figure 10, the 3rd signal V of high level
cPby transmission unit 22, transfer on signal read line and (as shown in Figure 8, on signal read line, have signal transmission), to gathered by the processor of signal read line rear end.
When processor collects the signal that transmitted by signal read line (i.e. the 3rd signal V
cP) time, can determine based on signal read line longitudinal (Y-direction) coordinate of touch location, and based on the output point of the first sweep trace Scan1 now, as horizontal (directions X) coordinate of touch location.So just determined X, the Y coordinate of touch location, with this, determined that the positional information touching occurs touch-screen.
Phase III:
In this stage, driver module 1 is in supplementing glow phase, and capacitance touching control detecting module 2 is in the lag phase.
The signal in this stage is inputted schematic diagram as 3 stages in accompanying drawing 8, i.e. the second sweep signal V
scan2, the 3rd signal V
cP, data-signal V
datafor low level signal, the first sweep signal V
scan1, control signal V
eMfor high level signal, thereby make the 4th thin film transistor (TFT) T4, the 5th thin film transistor (TFT) T5 and the 6th thin film transistor (TFT) T6 (being compensation drive unit 13) in conducting state, the first film transistor T 1 (being reset cell 11), the second thin film transistor (TFT) T2 and the 3rd thin film transistor (TFT) T3 (i.e. the first charhing unit 12), charging transistor M1 (i.e. the second charhing unit 21), switching transistor M3 is in cut-off state.
In this stage, as shown in solid arrow in Figure 11, because the 6th thin film transistor (TFT) T6 is in conducting state, therefore, data-signal V
databy the 6th thin film transistor (TFT) T6, by the first memory capacitance Cs1 first end, be that node A charges to data-signal V by zero potential
datacurrent potential, i.e. V
a3=V
data.
Because the 3rd thin film transistor (TFT) T3 is in cut-off state, so Node B is in floating, so, and in order to make the pressure differential maintain at the first memory capacitance Cs1 two ends at V
data-V
th, the current potential at node A rises to data-signal V so
datasituation under, Node B is that isobaric saltus step can occur the current potential of drive transistor gate, thereby makes the jump in potential of Node B to V
b3=2V
data-V
th.
And because the 4th thin film transistor (TFT) T4, the 6th thin film transistor (TFT) T6 are conducting state in this stage, in the phase III, secondary signal V
ddby the 4th thin film transistor (TFT) T4, input to the source electrode of driving transistors DTFT, Organic Light Emitting Diode OLED drive current arrives the anode of Organic Light Emitting Diode by the 6th thin film transistor (TFT) T6, thereby drives Organic Light Emitting Diode OLED luminous.
By driving transistors DTFT saturation current formula, can be obtained:
I
OLED＝K(V
GS–V
th)
2
＝K[V
dd-(2V
data-V
th)-V
th]
2
＝K(V
dd-2V
data)
2
Wherein, V
gSfor driving thin film transistor (TFT) DTFT gate source voltage, be V
dd-(2V
data-V
th), K is and drives thin film transistor (TFT) DTFT production technology and drive the relevant constant of design.
So from above-mentioned formula, in the utility model embodiment, the driving signal of Organic Light Emitting Diode OLED and the threshold voltage V of driving transistors DTFT
thhave nothing to do, i.e. the drive current I of OLED OLED
oLEDonly with secondary signal V
ddwith data-signal V
datarelevant, thus the threshold voltage V of driving transistors DTFT can be eliminated
thimpact on luminous driving signal, has thoroughly solved driving transistors DTFT because manufacturing process and long-time operation cause threshold voltage V
ththe problem of drift, ensures the normal work of OLED OLED.
And in the phase III, charging transistor M1 in capacitance touching control detecting module 2, amplifier transistor M2, switching transistor M3 all do not work in cut-off state, now also driver module 1 drives the luminous stage of Organic Light Emitting Diode OLED exactly, therefore, can reduce touch detection for the impact of display driver.
The image element driving method that the utility model embodiment provides, not only can eliminate the threshold voltage V of driving transistors DTFT
thimpact on luminous driving signal, thereby improve the homogeneity of organic electroluminescence display panel brightness, improve the image display effect of display device, can also be when realizing display driver, realize touch detection, thereby realize the high effective integration of display driver and touch detection.
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 device, and this display device specifically can comprise the organic electroluminescence display panel that above-mentioned the utility model embodiment provides.
This display device is specifically as follows the display device 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 device are particularly suitable for the GOA circuit requirements under LTPS (low temperature polycrystalline silicon technology) processing procedure, also applicable to the GOA circuit under amorphous silicon technology.
From the above, can find out, the image element circuit that the utility model provides, organic electroluminescence display panel and display device, this image element circuit comprises: driver module, respectively with the first sweep trace, the second sweep trace, control line, data line, first signal source, secondary signal source connects, for within a time cycle, the first sweep signal in the first sweep trace input, the second sweep signal of the second sweep trace input, under the control of the control signal of control line input, utilize the data-signal of data line input and the secondary signal of secondary signal source input to carry out drive transistor threshold voltage compensation deals, make the phase III in the described time cycle, the luminous driving signal of Organic Light Emitting Diode and drive transistor threshold voltage are irrelevant, capacitance touching control detecting module, is connected with the first sweep trace, control line, data line, the 3rd signal source, signal read line respectively, within the described time cycle, and under the control of the first sweep signal, control signal, the touch signal of detecting touch-screen.
The technique scheme that the utility model embodiment provides, can make the driving signal of Organic Light Emitting Diode OLED and the threshold voltage V of driving transistors DTFT
thirrelevant, thus the threshold voltage V of driving transistors DTFT can be eliminated
thimpact on luminous driving signal, improves the homogeneity of organic electroluminescence display panel brightness, improves the image display effect of display device.
Touch signal circuit for detecting that can integrated internally-arranged type touch-screen in the pixel cell providing due to the utility model embodiment, in display driver, realize the detecting of touch control operation, thereby realize pixel-driving circuit and the integrated setting of touch signal circuit for detecting.Such circuit structure setting, can realize internally-arranged type touch-screen and Organic Light Emitting Diode and drive show integrated, is conducive to reduce thickness and the weight of display panel, and can reduces the cost of display panel.
And, in the technical scheme that the utility model embodiment provides, can also avoid electric current for a long time by Organic Light Emitting Diode OLED, thereby can reduce the life consumption of Organic Light Emitting Diode OLED, extended the serviceable life of Organic Light Emitting Diode OLED.
In addition, in the technical scheme that the utility model embodiment provides, when driver module 1 drives Organic Light Emitting Diode OLED luminous, light sense touch control detecting module 2 stays cool, therefore, can reduce touch detection for the impact of display driver, thereby realize the high effective integration of display driver and touch detection.
Be pointed out that, the image element circuit that the utility model embodiment provides is applicable to the thin film transistor (TFT) of the techniques such as amorphous silicon, polysilicon, oxide.Meanwhile, although in above-described embodiment, the single employing P type thin film transistor (TFT) of take is illustrated as example, yet foregoing circuit can also adopt single N-type thin film transistor (TFT) or CMOS pipe circuit easily instead.And, although the active matrix organic light-emitting diode of take in above-described embodiment is illustrated as example, yet the utility model is not limited to use the display device of active matrix organic light-emitting diode, also can be applied to use the display device of other various light emitting diodes.
The above is only embodiment 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 domain of the present utility model.
Claims (11)
1. an image element circuit, comprises the first memory capacitance, driving transistors and Organic Light Emitting Diode, and the grid of described driving transistors is connected with first memory capacitance the second end;
It is characterized in that, described image element circuit also comprises:
Driver module, respectively with the first sweep trace, the second sweep trace, control line, data line, first signal source, secondary signal source connects, for within a time cycle, the first sweep signal in the first sweep trace input, the second sweep signal of the second sweep trace input, under the control of the control signal of control line input, utilize the data-signal of data line input and the secondary signal of secondary signal source input to carry out drive transistor threshold voltage compensation deals, make the phase III in the described time cycle, the luminous driving signal of Organic Light Emitting Diode and drive transistor threshold voltage are irrelevant,
Capacitance touching control detecting module, is connected with the first sweep trace, control line, data line, the 3rd signal source, signal read line respectively, within the described time cycle, and under the control of the first sweep signal, control signal, the touch signal of detecting touch-screen.
2. image element circuit as claimed in claim 1, is characterized in that, described driver module comprises:
Reset cell, is connected with first signal source, control line and the first memory capacitance first end respectively, for the first stage in the described time cycle, the current potential of the first memory capacitance first end is reset to the current potential of first signal;
The first charhing unit, be connected with the first sweep trace, data line, driving transistors, first memory capacitance the second end respectively, subordinate phase in the described time cycle, charges to the current potential of data-signal and the difference of drive transistor threshold voltage by the current potential of first memory capacitance the second end;
Compensation drive unit, be connected with the second sweep trace, data line, secondary signal source, the first memory capacitance first end, driving transistors respectively, for the phase III in the described time cycle, the current potential that the current potential of controlling the first memory capacitance first end is data-signal, the jump in potential that makes first memory capacitance the second end is the current potential of 2 haplotype data signals, difference with drive transistor threshold voltage, to define the luminous driving signal of OLED based on secondary signal and data-signal, and utilize described luminous drive Organic Light Emitting Diode luminous.
3. image element circuit as claimed in claim 2, is characterized in that, described reset cell comprises:
The first film transistor;
The transistorized source electrode of the first film is connected with first signal source, and the transistorized grid of the first film is connected with control line, and the transistorized drain electrode of the first film is connected with the first memory capacitance first end.
4. image element circuit as claimed in claim 2, is characterized in that, described the first charhing unit comprises:
The second thin film transistor (TFT) and the 3rd thin film transistor (TFT), wherein:
The source electrode of the second thin film transistor (TFT) is connected with data line, and the grid of the second thin film transistor (TFT) is connected with the first sweep trace, and the drain electrode of the second thin film transistor (TFT) is connected with the source electrode of driving transistors;
The 3rd source electrode of thin film transistor (TFT) and the drain electrode of driving transistors are connected, and the grid of the 3rd thin film transistor (TFT) is connected with the first sweep trace, and the drain electrode of the 3rd thin film transistor (TFT) is connected with first memory capacitance the second end.
5. image element circuit as claimed in claim 2, is characterized in that, described compensation drive unit comprises:
The 4th thin film transistor (TFT), the 5th thin film transistor (TFT), the 6th thin film transistor (TFT);
The source electrode of the 4th thin film transistor (TFT) is connected with secondary signal source, and the grid of the 4th thin film transistor (TFT) is connected with the second sweep trace, and the 4th drain electrode of thin film transistor (TFT) and the source electrode of driving transistors are connected;
The 5th source electrode of thin film transistor (TFT) and the drain electrode of driving transistors are connected, and the grid of the 5th thin film transistor (TFT) is connected with the second sweep trace, the 5th drain electrode of thin film transistor (TFT) and the anodic bonding of Organic Light Emitting Diode;
The source electrode of the 6th thin film transistor (TFT) is connected with data line, and the grid of the 6th thin film transistor (TFT) is connected with the second sweep trace, and the drain electrode of the 6th thin film transistor (TFT) is connected with the first memory capacitance first end.
6. image element circuit as claimed in claim 1, is characterized in that, described capacitance touching control detecting module comprises the second memory capacitance, the second charhing unit, transmission unit; Wherein:
The second charhing unit, is connected with data line, control line, second memory capacitance the second end respectively, for the first stage in the described time cycle, the current potential of second memory capacitance the second end is charged to the current potential of data-signal;
Transmission unit, be connected with the 3rd signal source, the second memory capacitance, the first sweep trace, signal read line respectively, for the subordinate phase in the described time cycle, when touch-screen is under the state of being touched, the 3rd signal of the 3rd signal source input is transferred to signal read line, so that the processor being connected with signal read line is determined the positional information of touch operation.
7. image element circuit as claimed in claim 6, is characterized in that, described the second charhing unit comprises:
Charging transistor;
The source electrode of charging transistor is connected with data line, and the grid of charging transistor is connected with control line, and the drain electrode of charging transistor is connected with second memory capacitance the second end.
8. image element circuit as claimed in claim 6, is characterized in that, described transmission unit comprises:
Amplifier transistor and switching transistor;
The source electrode of amplifier transistor is connected with the second memory capacitance first end, the 3rd signal source respectively, and the grid of amplifier transistor is connected with second memory capacitance the second end, and the drain electrode of amplifier transistor is connected with the source electrode of switching transistor;
The grid of switching transistor is connected with the first sweep trace, and the drain electrode of switching transistor is connected with signal read line.
9. the image element circuit as described in claim 1 to 8 any one, is characterized in that, described transistor is P transistor npn npn;
First signal is low level signal or zero potential signal;
Secondary signal is high level signal;
The 3rd signal is coupling pulse signal.
10. an organic electroluminescence display panel, is characterized in that, comprises the image element circuit of described claim 1-9 any one.
11. 1 kinds of display device, is characterized in that, comprise organic electroluminescence display panel as claimed in claim 10.
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| CN201420283019.7U CN203858846U (en) | 2014-05-29 | 2014-05-29 | Pixel circuit, organic light-emitting display panel and display device |
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|---|---|---|---|
| CN201420283019.7U CN203858846U (en) | 2014-05-29 | 2014-05-29 | Pixel circuit, organic light-emitting display panel and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104021756A (en) * | 2014-05-29 | 2014-09-03 | 京东方科技集团股份有限公司 | Pixel circuit and driving method thereof, organic light-emitting display panel and display apparatus |
| CN105609047A (en) * | 2016-01-04 | 2016-05-25 | 京东方科技集团股份有限公司 | Pixel circuit and driving method thereof, display panel |
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