CN105825815A - Organic light-emitting pixel circuit and driving method thereof - Google Patents
Organic light-emitting pixel circuit and driving method thereof Download PDFInfo
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- CN105825815A CN105825815A CN201610352730.7A CN201610352730A CN105825815A CN 105825815 A CN105825815 A CN 105825815A CN 201610352730 A CN201610352730 A CN 201610352730A CN 105825815 A CN105825815 A CN 105825815A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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Abstract
The invention provides an organic light-emitting pixel circuit and a driving method thereof. The organic light-emitting pixel circuit is characterized by comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a first capacitor, a second capacitor, and a light-emitting diode. The organic light-emitting pixel circuit and the driving method thereof and an organic light-emitting display device provided by the embodiments of the invention have the advantages of simple structure, simple manufacturing process, more accurate data signal writing, and no light leakage.
Description
Technical field
The present invention relates to organic light emitting display technical field, especially relate to a kind of luminosity OLED pixel circuit evenly.
Background technology
Organic Light Emitting Diode (OrganicLightEmittingDiode, OLED) display floater generally includes the image element circuit being positioned in viewing area and the drive circuit being positioned in periphery non-display area, wherein, drive circuit is responsible for providing various types of signals to image element circuit, to control image element circuit display image.
In the prior art, image element circuit generally comprises multiple transistor, electric capacity and light emitting diode, and the driving process of image element circuit generally comprises initial phase, data write phase, valve value compensation and glow phase.It is known that for the light emitting diode in each image element circuit, only arrived glow phase, just started luminescence.But, some circuit in the prior art exists certain stage before glow phase, the phenomenon that light emitting diode is also luminous, so not only result in the light leak of image element circuit and also can cause the low ratio degree effect that dark-state is dark, on state of does not works.
Summary of the invention
In view of this, on the one hand, the present invention provides a kind of OLED pixel circuit, it is characterized in that, including: the first transistor, transistor seconds, third transistor, the 4th transistor, the 5th transistor, the first electric capacity, the second electric capacity and light emitting diode, wherein, the grid of described the first transistor receives scan signal, first pole of described the first transistor receives the first reference signal or data signal, and the second pole of described the first transistor electrically connects the grid of described transistor seconds；First pole of described transistor seconds electrically connects the second pole of described third transistor；Described transistor seconds second pole electrically connect described 4th transistor the second pole；The grid of described third transistor receives LED control signal, and the first pole of described third transistor receives the first power supply voltage signal；The grid of described 4th transistor receives the second scanning signal, and the first pole of described 4th transistor receives the second reference signal；The grid of described 5th transistor receives described LED control signal, and the first pole of described 5th transistor electrically connects the second pole of described 4th transistor, and the second pole of described 5th transistor electrically connects the anode of described light emitting diode；The negative electrode of described light emitting diode receives second source voltage signal；First pole of described first electric capacity electrically connects the grid of described transistor seconds, and the intersection point of electrical connection is primary nodal point, and the second pole of described first electric capacity electrically connects the first pole of described 5th transistor, and the intersection point of electrical connection is secondary nodal point；First pole of described second electric capacity electrically connects the first pole of described third transistor, and the second pole of described second electric capacity electrically connects described secondary nodal point.
On the other hand, the present invention also provides for the driving method of a kind of driving OLED pixel circuit as described in foregoing teachings, it is characterized in that, in the first period, described the first transistor and described 4th transistor are opened, the current potential of described primary nodal point is equal to the current potential size of described first reference signal, and the current potential of described secondary nodal point is equal to the current potential size of described second reference signal；In the second period, described the first transistor is held open, the current potential of described primary nodal point is equal to the current potential size of described first reference signal, and described transistor seconds gradually becomes by state from opening until the current potential of described secondary nodal point becomes the difference of described first reference signal and the threshold voltage of described transistor seconds；In the 3rd period, described the first transistor is held open, the current potential of described primary nodal point becomes the current potential size of described data signal from the current potential size of first reference signal of described second period, and the current potential of described secondary nodal point adds the variable quantity of described primary nodal point current potential because of the coupling of described first electric capacity；In the 4th period, described transistor seconds, described third transistor and described 5th transistor are held open, described lumination of light emitting diode.
On the other hand, the present invention also provides for a kind of oganic light-emitting display device, it is characterised in that include the OLED pixel circuit as described in foregoing teachings.
Using a kind of OLED pixel circuit of embodiment of the present invention offer and drive driving method and oganic light-emitting display device, simple in construction, processing technology are simple, data signal writes more accurately and the phenomenon of light leak will not occur.
Accompanying drawing explanation
Organic image element circuit of one that Fig. 1 provides for the embodiment of the present invention；
A kind of driving method driving OLED pixel circuit as shown in Figure 1 that Fig. 2 provides for the embodiment of the present invention.
Detailed description of the invention
In order to the technology contents of the present invention is explained in greater detail; as follows especially exemplified by illustrating appended by specific embodiment cooperation; but the following drawings and detailed description of the invention are not limitation of the present invention; any art has usually intellectual; without departing from the spirit and scope of the present invention; when making a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on those as defined in claim.
Fig. 1 show organic image element circuit of one that the embodiment of the present invention provides, including: the first transistor T1, transistor seconds T2, third transistor T3, the 4th transistor T4, the 5th transistor T5, the first electric capacity C1, the second electric capacity C2 and light emitting diode D1, wherein, the grid of the first transistor T1 receives scan signal S1, first pole of the first transistor T1 receives the first reference signal VREF1 or data signal DATA, the grid of the second pole electrical connection transistor seconds T2 of the first transistor T1；Transistor seconds T2 first pole electrical connection third transistor T3 the second pole, transistor seconds T2 second pole electrical connection the 4th transistor T4 the second pole；The grid of third transistor T3 receives LED control signal EMIT, and the first pole of third transistor T3 receives the first power supply voltage signal VDD；The grid of the 4th transistor T4 receives the second scanning signal S2, and first pole of the 4th transistor T4 receives the second reference signal VREF2；The grid of the 5th transistor T5 receives second pole of first pole electrical connection the 4th transistor T4 of LED control signal EMIT, the 5th transistor T5, the anode of the second pole electrical connection light emitting diode D1 of the 5th transistor T5；The negative electrode of light emitting diode D1 receives second source voltage signal PVEE；The grid of the first pole electrical connection transistor seconds T2 of the first electric capacity C1, the intersection point of electrical connection is primary nodal point N1, and first pole of second pole electrical connection the 5th transistor T5 of the first electric capacity C1, the intersection point of electrical connection is secondary nodal point N2；First pole of first pole electrical connection third transistor T3 of the second electric capacity C2, the second pole electrical connection secondary nodal point N2 of the second electric capacity C2.
It should be noted that in the OLED pixel circuit shown in Fig. 1, all transistors all use N-type transistor, but are not limited thereto kind of a design, it is also possible to all use P-type transistor.
Fig. 2 show the driving method of a kind of driving OLED pixel circuit as shown in Figure 1.It follows that combine Fig. 1 and Fig. 2 so that the operation principle of OLED pixel circuit shown in Fig. 1 to be described.
Before illustrating operation principle, it should be noted that, driving method shown in Fig. 2 is adaptable to the pure N-type OLED pixel circuit shown in Fig. 1, therefore, if for a certain OLED pixel circuit is the embodiment that pure P-type transistor is constituted, in this driving method, the impulse waveform in each stage should be the most anti-phase with the impulse waveform shown in Fig. 2, concrete, repeats no more.
It can further be stated that, only give in a frame time (oneframe) drive waveforms of OLED pixel circuit in two row (Nth row and N+1 row) image element circuit in fig. 2, the drive waveforms of the OLED pixel circuit in other row image element circuit is same, the most too much drawing out at this.In this driving method embodiment, illustrate as a example by the drive waveforms of OLED pixel circuit in nth row of pixels circuit.
Concrete, in the driving method shown in Fig. 2, including 4 periods.At the first period P1, scan signal S1 [N] is high level signal, and the second scanning signal S2 [N] is high level signal, and LED control signal EMIT is high level signal.The first transistor T1, third transistor T3, the 4th transistor T4 and the 5th transistor T5 open, and in this stage, first pole of the first transistor T1 receives the first reference signal VREF1, and therefore, the current potential of the primary nodal point N1 size in this period is:
VN1=VREF1,
The current potential of the current potential of the secondary nodal point size in this period is:
VN2=VREF2,
At the first period P1, it is achieved that this OLED pixel circuit is driven pipe (transistor seconds T2) grid and the set of the second electrode potential.
At the second period P2, scan signal S1 [N] is high level signal, and the second scanning signal S2 [N] is low level signal, and LED control signal EMIT is high level signal.The first transistor T1 is held open, and the current potential of primary nodal point N1 is equal to the current potential size of the first reference signal VREF1, and transistor seconds T2 gradually becomes by state from opening until the secondary nodal point current potential in this period becomes
VN2=VREF1-Vth,
Wherein, Vth is the threshold voltage of transistor seconds T2.At the second period P2, it is achieved that this OLED pixel circuit drives the threshold value of pipe (transistor seconds T2) capture, and utilizes the first electric capacity C1 that this current potential is stored in secondary nodal point N2.
Being high level signal at the 3rd period P3, scan signal S1 [N], the second scanning signal S2 [N] is low level signal, and LED control signal EMIT is low level signal.The first transistor T1 is held open, and the current potential of primary nodal point becomes data signal VDATA from first reference signal VREF1 of the first period P1 and the second period P2, and therefore the primary nodal point current potential in this period becomes
VN1=VDATA,
Therefore, the potential change amount of primary nodal point N1 is:
ΔVN1=VDATA-VREF1,
Due to the coupling of the first electric capacity C1, therefore, the current potential of secondary nodal point N2 in this period is:
Simultaneously, due in this period, 5th transistor T5 by, therefore, although the current potential that secondary nodal point N2 is in this period can change along with the change of primary nodal point current potential, but this change does not interferes with the current potential of light emitting diode D1 anode, therefore, also can prevent light emitting diode D1 should not be luminous period luminous, it is to avoid the generation of light leakage phenomena, it also avoid the threshold value detecting that the generation of leaky caused inaccurate so that the real effect of OLED pixel circuit is more uniform.
Being low level signal at the 4th period P4, scan signal S1 [N], the second scanning signal S2 [N] is low level signal, and LED control signal EMIT is high level signal, and transistor seconds T2, third transistor T3 and the 5th transistor T5 open.Therefore, in this period, the current potential of primary nodal point N1 is:
The current potential of secondary nodal point N2 is:
VN2=(VEE+Voled),
Wherein, Voled is the current potential size of light emitting diode D1.Therefore, in this period, the size of current flowing through light emitting diode D1 is:
Thus, it is possible to find out, the final luminosity of this OLED pixel circuit is not dependent on driving pipe (threshold voltage of transistor seconds T2), it is possible to achieve the compensating action of threshold voltage.
By combining the embodiment shown in Fig. 1 and Fig. 2, can the effect in whole OLED pixel circuit of clear and definite 5th transistor be: be used for preventing at non-luminescent stage (arbitrary period in addition to the 4th moment P4 shown in such as Fig. 2 embodiment), secondary nodal point N2 is luminous with the light emitting diode D1 caused by primary nodal point N1 potential change, avoid the generation of light leakage phenomena, it also avoid the threshold value detecting that the generation of leaky caused inaccurate so that the real effect of OLED pixel circuit is more uniform.
By combining the embodiment shown in Fig. 1 and Fig. 2, transistor seconds T2 can be specified for luminous at glow phase (the 4th moment P4 shown in such as Fig. 2 embodiment) driven for emitting lights diode D1.
By combining the embodiment shown in Fig. 1 and Fig. 2, can be used for coupling the potential change between primary nodal point N1 and secondary nodal point N2 by clear and definite first electric capacity C1, and then reach the purpose of data signal VDATA write.
In addition, the embodiment of the present invention also proposed a kind of oganic light-emitting display device, the concrete structure of this oganic light-emitting display device includes OLED pixel circuit as shown in Figure 1, and include the driving method of OLED pixel circuit as shown in Figure 2, here is omitted for concrete structure, and this oganic light-emitting display device can be the display devices such as mobile phone, computer, panel computer, display device for mounting on vehicle.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute without departing from protection scope of the present invention.Therefore, although being described in further detail the present invention by above example, but the present invention is not limited only to above example, without departing from the inventive concept, other Equivalent embodiments more can also be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (9)
1. an OLED pixel circuit, it is characterised in that including: the first transistor, transistor seconds, third transistor, the 4th transistor, the 5th transistor, the first electric capacity, the second electric capacity and light emitting diode, wherein,
The grid of described the first transistor receives scan signal, and the first pole of described the first transistor receives the first reference signal or data signal, and the second pole of described the first transistor electrically connects the grid of described transistor seconds；
First pole of described transistor seconds electrically connects the second pole of described third transistor；Described transistor seconds second pole electrically connect described 4th transistor the second pole；
The grid of described third transistor receives LED control signal, and the first pole of described third transistor receives the first power supply voltage signal；
The grid of described 4th transistor receives the second scanning signal, and the first pole of described 4th transistor receives the second reference signal；
The grid of described 5th transistor receives described LED control signal, and the first pole of described 5th transistor electrically connects the second pole of described 4th transistor, and the second pole of described 5th transistor electrically connects the anode of described light emitting diode；
The negative electrode of described light emitting diode receives second source voltage signal；
First pole of described first electric capacity electrically connects the grid of described transistor seconds, and the intersection point of electrical connection is primary nodal point, and the second pole of described first electric capacity electrically connects the first pole of described 5th transistor, and the intersection point of electrical connection is secondary nodal point；
First pole of described second electric capacity electrically connects the first pole of described third transistor, and the second pole of described second electric capacity electrically connects described secondary nodal point.
2. OLED pixel circuit as claimed in claim 1, it is characterised in that described the first transistor, described transistor seconds, described third transistor, described 4th transistor and described 5th transistor are N-type transistor.
3. OLED pixel circuit as claimed in claim 1, it is characterised in that described the first transistor, described transistor seconds, described third transistor, described 4th transistor and described 5th transistor are P-type transistor.
4. OLED pixel circuit as claimed in claim 1, it is characterised in that described 5th transistor is used for preventing in the non-luminescent stage, and described secondary nodal point is with the described lumination of light emitting diode caused by described primary nodal point potential change.
5. OLED pixel circuit as claimed in claim 1, it is characterised in that described transistor seconds is for driving described lumination of light emitting diode in glow phase.
6. OLED pixel circuit as claimed in claim 1, it is characterised in that described first electric capacity is for coupling the potential change between described primary nodal point and described secondary nodal point.
7. the driving method driving OLED pixel circuit as claimed in claim 1, it is characterised in that
In the first period, described the first transistor and described 4th transistor are opened, and the current potential of described primary nodal point is equal to the current potential size of described first reference signal, and the current potential of described secondary nodal point is equal to the current potential size of described second reference signal；
In the second period, described the first transistor is held open, the current potential of described primary nodal point is equal to the current potential size of described first reference signal, and described transistor seconds gradually becomes by state from opening until the current potential of described secondary nodal point becomes the difference of described first reference signal and the threshold voltage of described transistor seconds；
In the 3rd period, described the first transistor is held open, the current potential of described primary nodal point becomes the current potential size of described data signal from the current potential size of first reference signal of described second period, and the current potential of described secondary nodal point adds the variable quantity of described primary nodal point current potential because of the coupling of described first electric capacity；
In the 4th period, described transistor seconds, described third transistor and described 5th transistor are held open, described lumination of light emitting diode.
8. the driving method of OLED pixel circuit as claimed in claim 8, it is characterized in that, in described 3rd period, described 5th transistor by, prevent the current potential of described secondary nodal point to be driven high, because of described first Capacitance Coupled effect, the described lumination of light emitting diode caused.
9. an oganic light-emitting display device, it is characterised in that include the OLED pixel circuit as described in claim 1-8 is arbitrary.
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