CN107038989A - OLED and its driving method - Google Patents
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Abstract
In the OLED and its driving method that the present invention is provided, the reset circuit being made up of the first test signal line, the second test signal line and reset transistor carries out voltage replacement to the pixel cell of viewing area, so as to avoid TFT hesitations, simultaneously because the reset circuit is located at non-display area, therefore, it is possible to avoid adversely affecting aperture opening ratio and resolution ratio.
Description
Technical field
The present invention relates to technical field of flat panel display, more particularly to a kind of OLED and its driving side
Method.
Background technology
In recent years, with the fast development and application, people of information technology, radio mobile communication and information household appliances
It is growing day by day to the dependence of electronic product, more bring flourishing for various Display Techniques and display device.
Panel display apparatus have fully planarize, light, thin, power saving the features such as, therefore be widely used.
Wherein, OLED is that one kind utilizes Organic Light Emitting Diode (English full name Organic
Lighting Emitting Diode, abbreviation OLED) display image panel display apparatus, be a kind of actively to send out
The display of light, its display mode and traditional Thin Film Transistor-LCD (English full name Thin Film
Transistor liquid crystal display, abbreviation TFT-LCD) display mode difference, without backlight,
Moreover, with contrast height, fast response time, visual angle it is wide, it is frivolous many advantages, such as.Therefore, You Jifa
Optical display unit is described as replacing the display of new generation of Thin Film Transistor-LCD.
Fig. 1 is refer to, it is the circuit diagram of the OLED of prior art.As shown in figure 1, existing
OLED 100 include viewing area and the non-display area around the viewing area, institute
State and power line vdd, scan line Scan line, data wire data and the scan line are provided with viewing area
The pel array that Scan line and data wire data is defined, the pel array includes multiple in matrix row
The pixel cell of cloth, each pixel cell includes Organic Light Emitting Diode OLED and described had for driving
Machine light emitting diode OLED image element circuit 10, the image element circuit 10 includes switching transistor T1, driven
Dynamic transistor T2 and storage capacitance Cs, the switching transistor T1 grid are connected with scan line Scan line,
The source electrode of the switching transistor T1 is connected with data wire data, the grid of the driving transistor T2 and institute
Switching transistor T1 drain electrode connection is stated, the source electrode of the driving transistor T2 is connected with power line vdd,
The drain electrode of the driving transistor T2 is connected with the anode of the Organic Light Emitting Diode OLED, described organic
Light emitting diode OLED minus earth.
When opening the switching transistor T1 by scan line Scan line, the data that data wire data is provided
Signal writes storage capacitance Cs, and storage capacitance Cs is connected with driving transistor T2 grid, and control flows through drive
Dynamic transistor T2 electric current, the driving current driving Organic Light Emitting Diode OLED of driving transistor T2 outputs
It is luminous so that the Organic Light Emitting Diode OLED sends the light of different GTGs.
The OLED 100 requires that driving transistor T2 ensure that the stability of output current,
I.e. in the case of grid voltage identical, the driving current energy that driving transistor T2 is exported in image element circuit 10
Homogeneity on enough retention times and uniformity spatially.However, generally using thin film transistor (TFT) (English at present
Literary full name Thin Film Transistor, abbreviation TFT) as driving transistor T2, TFT is in its grid electricity
Pressure presses to negative voltage variation (forward scan) by positive electricity and presses to positive voltage variation (reverse scan) by negative electricity
During its transfer characteristic be different, threshold value of the threshold voltage than forward scan of usual anti-phase scanning
Voltage is smaller, and this phenomenon is referred to as TFT hesitations.TFT hesitations can cause driving current in the time
On nonidentity so that occur during 100 display image of OLED ghost etc. display it is bad.
In order to avoid TFT hesitations, prior art, which is typically employed in image element circuit, increases a reset crystalline substance
The design method of body pipe, is initialized by reset transistor to the storage capacitance Cs of image element circuit so that
The direction for data-signal charging current when being filled with storage capacitance Cs that data wire data is provided is consistent.It refer to
Fig. 2, it is the circuit diagram of the OLED for having additional reset transistor of prior art.Such as Fig. 2 institutes
Show, existing OLED 200 increases on the basis of the OLED 100 shown in Fig. 1
If the first scan line Scan line1, reseting signal line Vref and reset transistor T3, the reset crystal
Pipe T3 grid is connected with the first scan line Scan line1, and the source electrode of the reset transistor T3 is believed with resetting
Number line Vref connections, the drain electrode of the reset transistor T3 is connected with storage capacitance Cs one end.
Before the switching transistor T1 is opened, opened by the first scan line Scan line1 and reset crystal
Pipe T3 so that driving transistor T2 grid voltage is reset to low level.Afterwards, the second scan line is passed through
Scan line2 open the switching transistor T1 so that the data-signal that data wire data is provided is loaded into drive
Dynamic transistor T2 grid.In this way, the curent change of the driving transistor T2 (is filled with storage capacitance
Cs charging direction) always along a direction.
Although however, TFT hesitations can be improved using this type of drive, with 2T1C types
The image element circuit 10 of circuit structure is compared, and a transistor is added in the image element circuit 20, is increased
The area of pixel cell, reduces the aperture opening ratio of pixel cell, while setting up the first scanning in viewing area
Line Scan line1 and reseting signal line Vref can also reduce the resolution ratio of display.
Base this, how to solve existing OLED because improve TFT hesitations influence aperture opening ratio
And the problem of resolution ratio, into those skilled in the art's technical problem urgently to be resolved hurrily.
The content of the invention
It is existing to solve it is an object of the invention to provide a kind of OLED and its driving method
The problem of OLED influences aperture opening ratio and resolution ratio because improving TFT hesitations.
To solve the above problems, the present invention provides a kind of OLED, the OLED
Including：Viewing area and the non-display area around the viewing area；
The picture that the viewing area includes scan line, data wire and the scan line and data wire are defined
Pixel array, the pel array includes multiple pixel cells arranged in matrix, and each pixel cell includes
Organic Light Emitting Diode and the image element circuit for driving the Organic Light Emitting Diode；
The non-display area includes the first test cabling, the second test cabling and reset transistor, described multiple
The grid of bit transistor is connected with the second test cabling, the source electrode of the reset transistor and the first test cabling
Connection, the drain electrode of the reset transistor is connected with data wire.
Optionally, in described OLED, in addition to power line, the power line with it is described
Data wire be arranged in parallel and is connected with the pixel cell.
Optionally, in described OLED, the image element circuit includes the first transistor, the
Two-transistor and storage capacitance, the grid of the first transistor are connected with scan line, the first transistor
Source electrode be connected with data wire, the drain electrode of the grid, the first transistor of the second transistor and storage capacitance
Second substrate be all connected to node, the source electrode of the second transistor and the first substrate of storage capacitance with
Power line is connected, and the drain electrode of the second transistor is connected with the anode of the Organic Light Emitting Diode, described
The minus earth of Organic Light Emitting Diode.
Optionally, in described OLED, the first transistor, second transistor and multiple
Bit transistor is thin film transistor (TFT).
Optionally, in described OLED, the first test cabling is into box test phase
For transmitting data-signal, the first test cabling is used to transmit reset signal in the module stage.
Optionally, in described OLED, the non-display area also includes low level signal
Line, the first scan control line, the second scan control line, low level gating circuit and scanning signal output end；
The low level signal line, the first scan control line and the second scan control line be arranged in parallel；It is described,
The low level gating circuit is arranged between scanning signal output end and the scan line of viewing area, and respectively
It is connected with the scan line and scanning signal output end.
Optionally, in described OLED, the low level gating circuit includes the 4th crystal
Pipe and the 5th transistor, the grid of the 4th transistor are connected with the first scan control line, and the described 4th is brilliant
The source electrode of body pipe is connected with the scanning signal output end, and the grid of the 5th transistor and the second scanning are controlled
Line processed connection, the source electrode of the 5th transistor is connected with low level signal line, the 4th transistor and the
The drain electrode of five transistors is connected with corresponding scan line.
Optionally, in described OLED, the 4th transistor and the 5th transistor are
Thin film transistor (TFT).
Accordingly, present invention also offers a kind of driving method of OLED, the organic light emission
The driving method of display includes：
In Data writing time section, the scanning signal that scan line is provided is changed into low level from high level, opens the
One transistor, data-signal is write via the first transistor, and the second transistor turns on and exports drive
Streaming current so that Organic Light Emitting Diode is lighted luminous；And
In interval time section, stop write-in data-signal；Meanwhile, the scanning signal of scan line offer, first
The test signal that the reset signal and the second test cabling that test cabling is provided are provided is changed into low electricity by high level
It is flat, the first transistor and reset transistor are opened, the grid voltage of second transistor is reset to low level.
Optionally, in Data writing time section, first in the driving method of described OLED
The first scan control signal that scan control line is provided remains low level, the second scan control line provide the
Two scan control signals remain high level；And
In interval time section, the first scan control signal that the first scan control line is provided is become by low level
For high level, the second scan control signal that the second scan control line is provided is to become low level by high level.
In the OLED that provides of the present invention and its driving method, by the first test signal line,
The reset circuit that second test signal line and reset transistor are constituted carries out voltage to the pixel cell of viewing area
Reset, so that TFT hesitations are avoided, simultaneously because the reset circuit is located at non-display area, therefore
It can avoid adversely affecting aperture opening ratio and resolution ratio.
Brief description of the drawings
Fig. 1 is the circuit diagram of the OLED of prior art；
Fig. 2 is the circuit diagram of the OLED for having additional reset transistor of prior art；
Fig. 3 is the circuit diagram of the OLED of the embodiment of the present invention one；
Fig. 4 is the timing diagram of the driving method of the OLED of the embodiment of the present invention one；
Fig. 5 is the circuit diagram of the OLED of the embodiment of the present invention two；
Fig. 6 is the timing diagram of the driving method of the OLED of the embodiment of the present invention two.
Embodiment
Below in conjunction with the drawings and specific embodiments to a kind of OLED proposed by the present invention and its driving
Method is described in further detail.According to following explanation and claims, advantages and features of the invention will
Become apparent from.It should be noted that, accompanying drawing is using very simplified form and uses non-accurately ratio, only
To convenient, the lucidly aid illustration embodiment of the present invention purpose.
【Embodiment one】
Fig. 3 is refer to, it is the circuit diagram of the OLED of the embodiment of the present invention one.As shown in figure 3,
The OLED 300 includes：Viewing area and the non-display area around the viewing area；
The viewing area includes scan line Scan line, data wire data and the scan line Scan line and number
The pel array defined according to line data, the pel array includes multiple pixel cells arranged in matrix,
Each pixel cell includes Organic Light Emitting Diode OLED and for driving the Organic Light Emitting Diode
OLED image element circuit 30；The non-display area includes the first test cabling CT1, the second test cabling
CT2 and reset transistor T3, the grid of the reset transistor T3 is connected with the second test cabling CT2,
The source electrode of the reset transistor T3 is connected with the first test cabling CT1, the leakage of the reset transistor T3
Pole is connected with data wire data.
Specifically, the viewing area is also referred to as AA areas, the viewing area also includes power line vdd, institute
Power line vdd is stated to be arranged in parallel and be connected with pixel cell with the data wire data.The pixel cell bag
Include Organic Light Emitting Diode OLED and image element circuit 30, the image element circuit 30 include the first transistor T1,
Second transistor T2 and storage capacitance Cs, the first transistor T1 grid connect with scan line Scan line
Connect, the source electrode of the first transistor T1 is connected with data wire data, the grid of the second transistor T2,
The first transistor T1 drain electrode and storage capacitance Cs second substrate are all connected to node N, and described second is brilliant
Body pipe T2 source electrode and storage capacitance Cs first substrate are connected with power line vdd, second crystal
Pipe T2 drain electrode is connected with the anode of the Organic Light Emitting Diode OLED, the Organic Light Emitting Diode
OLED minus earth.
As shown in figure 3, the image element circuit 30 is a kind of 2T1C types circuit structure, including 2 transistors
With 1 electric capacity.Wherein, the first transistor T1 is as switch crystal, and the scan line Scan line are used to control
The first transistor T1 processed conducting and cut-off, second transistor T2 is used as driving transistor.
Please continue to refer to Fig. 3, the first test cabling CT1, the second test cabling CT2 and reset crystal
Pipe T3 may be contained within the non-display area, and the second test cabling CT2 is used to control the reset crystal
Pipe T3 conducting and cut-off, the first test cabling CT1 is used for testing (Cell Test) stage into box
Data-signal is transmitted, the first test cabling CT1 is used to transmit reset signal in the module stage.
In the present embodiment, the first transistor T1, second transistor T2 and reset transistor T3 are P
Type thin film transistor (TFT).In other embodiments, the first transistor T1, second transistor T2 and reset
Transistor T3 can be N-type TFT.
When the scan line Scan line scanning signals provided transit to low level, the first transistor
T1 is turned on.Now, the data-signal that the data wire data is provided writes via the first transistor T1
Node N.When the data signal transitions that the data wire data is provided are to low level, the second transistor
T2 conductings and output driving current so that the Organic Light Emitting Diode OLED lights luminous.
The test letter provided as the scan line Scan line scanning signals provided and the second test cabling CT2
When number transitting to low level, the first transistor T1 and reset transistor T3 are both turned on.Now, institute
The reset signal for stating the first test cabling CT1 offers writes via reset transistor T3 and the first transistor T1
Node N so that the grid voltage of the second transistor T2 is reset to initial voltage.
In the OLED 300 that the present embodiment is provided, walked by the test positioned at non-display area
Line carries out voltage replacement to the pixel cell of viewing area, and reset transistor and phase are set up without in viewing area
The cabling answered can just avoid TFT hesitations.The OLED 300 ensure aperture opening ratio and
On the basis of resolution ratio, TFT hesitations can be avoided.
Accordingly, present invention also offers a kind of driving method of OLED.Incorporated by reference to referring to Fig. 3
And Fig. 4, the driving method of the OLED includes：
Scanning signal, the first test cabling CT1 in interval time section t, scan line Scan line offer are carried
The test signal that the reset signal of confession and the second test cabling CT2 are provided is changed into low level by high level, beats
The first transistor T1 and reset transistor T3 are opened, the grid voltage of the second transistor T2 is reset to low
Level.
Specifically, the scanning signal progressive scan pel array that scan line Scan line are provided, scan period bag
Include Data writing time section and interval time section t.
In Data writing time section, the scanning signal that scan line Scan line are provided is changed into low level from high level,
The first transistor T1 is opened, the data-signal that data wire data is provided writes the node N, as data wire data
When the data-signal of offer transits to low level by high level, the second transistor T2 conductings and output driving
Electric current so that the Organic Light Emitting Diode OLED lights luminous.
In interval time section t, the data-signal that data wire data is provided stops write-in, scan line Scan line
The test signal that the scanning signal of offer and the second test cabling CT2 are provided is changed into low level by high level
VGL, opens the first transistor T1 and reset transistor T3, while the first test cabling CT1 is provided
Reset signal low level Vref is changed into from high level, and by the current potential of the node N (i.e. second transistor
T2 grid voltage) it is reset to low level Vref.
After interval time section t terminates, because the grid voltage of the second transistor T2 is reset to low level
Vref, therefore when being written into data-signal every time, voltage changes in the same direction.
The course of work of repeated data write time section and interval time section t, so as to complete image display function.
In the present embodiment, using clock signal as shown in Figure 4, in electricity of the interval time section t to node N
Position is resetted, and in Data writing time section write-in data-signal, voltage changes in the same direction.Therefore,
TFT hesitations can be avoided using the driving method of the OLED.
【Embodiment two】
Fig. 5 is refer to, it is the circuit diagram of the OLED of the embodiment of the present invention two.As shown in figure 5,
The OLED 400 includes：Viewing area and the non-display area around the viewing area；
The viewing area includes scan line Scan line, data wire data and the scan line Scan line and number
The pel array defined according to line data, the pel array includes multiple pixel cells arranged in matrix,
Each pixel cell includes Organic Light Emitting Diode OLED and for driving the Organic Light Emitting Diode
OLED image element circuit 30；The non-display area includes the first test cabling CT1, the second test cabling
CT2 and reset transistor T3, the grid of the reset transistor T3 is connected with the second test cabling CT2,
The source electrode of the reset transistor T3 is connected with the first test cabling CT1, the leakage of the reset transistor T3
Pole is connected with data wire data.
Specifically, the present embodiment is with the difference of embodiment one, the non-display area also includes low electricity
Flat signal wire VGL, the first scan control line SW-1, the second scan control line SW-2, low level gating electricity
Road 40 and scanning signal output end 50；The low level signal line VGL, the first scan control line SW-1
It is be arranged in parallel with the second scan control line SW-2, it is defeated that the low level gating circuit 40 is arranged at scanning signal
Go out between the 50 and scan line Scan line of viewing area of end, and respectively with the scan line Scan line and sweeping
Signal output part 50 is retouched to connect；It is brilliant that each low level gating circuit 40 includes the 4th transistor T4 and the 5th
Body pipe T5, the grid of the 4th transistor T4 is connected with the first scan control line SW-1, and the described 4th is brilliant
Body pipe T4 source electrode is connected with the scanning signal output end 50, the grid of the 5th transistor T5 and
Two scan control line SW-2 connections, source electrode and the low level signal line VGL of the 5th transistor T5 connect
Connect, the drain electrode of the 4th transistor T4 and the 5th transistor T5 connects with corresponding scan line Scan line
Connect.
In the present embodiment, the 4th transistor T4 and the 5th transistor T5 is thin film transistor (TFT).
Include incorporated by reference to the driving method with reference to Fig. 5 and Fig. 6, the OLED：
In Data writing time section, the first scan control signal that the first scan control line SW-1 is provided
Low level is remained, the second scan control signal that the second scan control line SW-2 is provided remains high electricity
Flat, now the scan line Scan line normally export scanning signal；
In interval time section t, the first scan control signal that the first scan control line SW-1 is provided is by low
Level is changed into high level, and the second scan control signal that the second scan control line SW-2 is provided is by high electricity
Flat to become low level, now the scan line Scan line of all rows export low level VGL.
It should be noted that the embodiment of each in this specification is described by the way of progressive, each embodiment
What is stressed is all the difference with other embodiment, and identical similar portion is mutual between each embodiment
Referring to.
To sum up, in the OLED and its driving method that the present invention is provided, by positioned at non-display
The test signal line in region carries out voltage replacement to the pixel cell of viewing area, so as to ensure opening
TFT hesitations are avoided on the basis of rate and resolution ratio.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention,
Any change, modification that the those of ordinary skill in field of the present invention does according to the disclosure above content, belong to power
The protection domain of sharp claim.
Claims (10)
1. a kind of OLED, it is characterised in that including：Viewing area and around the display
The non-display area in region；
The picture that the viewing area includes scan line, data wire and the scan line and data wire are defined
Pixel array, the pel array includes multiple pixel cells arranged in matrix, and each pixel cell includes
Organic Light Emitting Diode and the image element circuit for driving the Organic Light Emitting Diode；
The non-display area includes the first test cabling, the second test cabling and reset transistor, described multiple
The grid of bit transistor is connected with the second test cabling, the source electrode of the reset transistor and the first test cabling
Connection, the drain electrode of the reset transistor is connected with data wire.
2. OLED as claimed in claim 1, it is characterised in that also including power line, institute
Power line is stated to be arranged in parallel and be connected with the pixel cell with the data wire.
3. OLED as claimed in claim 2, it is characterised in that the image element circuit includes
The first transistor, second transistor and storage capacitance, the grid of the first transistor are connected with scan line,
The source electrode of the first transistor is connected with data wire, the grid of the second transistor, the first transistor
The second substrate of drain electrode and storage capacitance is all connected to node, the source electrode and storage capacitance of the second transistor
First substrate be connected with power line, the drain electrode of the second transistor is with the Organic Light Emitting Diode
Anode is connected, the minus earth of the Organic Light Emitting Diode.
4. OLED as claimed in claim 3, it is characterised in that the first transistor,
Second transistor and reset transistor are thin film transistor (TFT).
5. OLED as claimed in claim 1, it is characterised in that the first test cabling
It is being used to transmit data-signal into box test phase, the first test cabling is used to transmit again in the module stage
Position signal.
6. OLED as claimed in claim 1, it is characterised in that the non-display area is also
Including low level signal line, the first scan control line, the second scan control line, low level gating circuit and sweep
Retouch signal output part；
The low level signal line, the first scan control line and the second scan control line be arranged in parallel；It is described,
The low level gating circuit is arranged between scanning signal output end and the scan line of viewing area, and respectively
It is connected with the scan line and scanning signal output end.
7. OLED as claimed in claim 6, it is characterised in that the low level gating electricity
Road includes the 4th transistor and the 5th transistor, and the grid of the 4th transistor and the first scan control line connect
Connect, the source electrode of the 4th transistor is connected with the scanning signal output end, the grid of the 5th transistor
Pole is connected with the second scan control line, and the source electrode of the 5th transistor is connected with low level signal line, described
The drain electrode of 4th transistor and the 5th transistor is connected with corresponding scan line.
8. OLED as claimed in claim 7, it is characterised in that the 4th transistor and
5th transistor is thin film transistor (TFT).
9. a kind of driving method of OLED as any one of claim 1 to 8, its
It is characterised by, including：
In Data writing time section, the scanning signal that scan line is provided is changed into low level from high level, opens the
One transistor, data-signal is write via the first transistor, and the second transistor turns on and exports drive
Streaming current so that Organic Light Emitting Diode is lighted luminous；And
In interval time section, stop write-in data-signal；Meanwhile, the scanning signal of scan line offer, first
The test signal that the reset signal and the second test cabling that test cabling is provided are provided is changed into low electricity by high level
It is flat, the first transistor and reset transistor are opened, the grid voltage of second transistor is reset to low level.
10. the driving method of OLED as claimed in claim 9, it is characterised in that in number
According to write time section, the first scan control signal that the first scan control line is provided remains low level, second
The second scan control signal that scan control line is provided remains high level；And
In interval time section, the first scan control signal that the first scan control line is provided is become by low level
For high level, the second scan control signal that the second scan control line is provided is to become low level by high level.
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| CN108877645A (en) * | 2018-07-24 | 2018-11-23 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method, display panel, mosaic screen |
| CN109637380A (en) * | 2019-01-28 | 2019-04-16 | 昆山国显光电有限公司 | A kind of display panel and display device |
| CN109712571A (en) * | 2019-03-19 | 2019-05-03 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method, display device |
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