CN206301579U - Image element circuit and display panel - Google Patents
Image element circuit and display panel Download PDFInfo
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- CN206301579U CN206301579U CN201621476252.2U CN201621476252U CN206301579U CN 206301579 U CN206301579 U CN 206301579U CN 201621476252 U CN201621476252 U CN 201621476252U CN 206301579 U CN206301579 U CN 206301579U
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Abstract
The utility model belongs to display technology field, and in particular to a kind of image element circuit and display panel.The image element circuit includes switch element, driver element and luminescence unit; also include short-circuit protection unit; the short-circuit protection unit is arranged in series between the driver element and the luminescence unit; for obtaining the input end signal of the luminescence unit and being cut off according to the anode signal of the luminescence unit for obtaining or turn on the input signal branch road of the luminescence unit, with the influence for preventing the short circuit between the anode and negative electrode inside the luminescence unit from being caused to the luminance of the luminescence unit.The image element circuit, controls the closed-loop path for driving OLED luminous to disconnect by short-circuit protection unit, it is to avoid OLED is because of pixel abnormal problem caused by negative electrode and anode in short circuit, and the more reliable stabilization of structure, method are simple and easy to apply.
Description
Technical field
The utility model belongs to display technology field, and in particular to a kind of image element circuit and display panel.
Background technology
With the development of Display Technique, OLED (Organic Light-Emitting Diode, Organic Light Emitting Diode)
As New Type Display Devices, obtain increasingly being widely applied.
In OLED micro display structure, including negative electrode, anode and between negative electrode and anode beneficial to hole
The functional structure film layer of transmission, electric transmission etc., because each film layer between negative electrode and anode is relatively thin, is susceptible to negative electrode with sun
Extremely short road；Especially, its complex process in manufacturing process, once film layer has other techniques such as foreign matter or borehole, climbing not have
Control, the film layer that can cause to light herein is relatively thin, causes resistance between OLED negative electrode and anode smaller, so that occurring short
Road.If the negative electrode of OLED is short-circuited with anode in an image element circuit, not only this pixel will not light, herein
Accordingly there is stain；Simultaneously as having a high current flows through the pixel, the pixel light emission on periphery can be also influenceed.Therefore,
The negative electrode of OLED can have a strong impact on display quality with anode in short circuit.
To ensure display quality, it is necessary to this bad pixel is removed, produced with anode in short circuit with the negative electrode for suppressing OLED
Raw high current.In current image element circuit, because the short-circuit processing method that negative electrode and the anode of OLED cause is to first pass through
Inquiry mode finds bad point pixel, is then destroyed this pixel using laser ablation, and not only process is complicated, and once has
New bad point is difficult to remedy.
It can be seen that, design a kind of new image element circuit, can automatic detection and eliminate because OLED negative electrode and
The influence that anode in short circuit is produced, the emphasis as current technical staff research and development.
Utility model content
Technical problem to be solved in the utility model is directed to above shortcomings in the prior art, there is provided a kind of picture
Plain circuit and display panel, can at least realize automatic detection and eliminate because of the shadow that the negative electrode of OLED is produced with anode in short circuit
Ring.
It is the image element circuit to solve the technical scheme that is used of the utility model technical problem, including switch element, is driven
Unit and luminescence unit, also including short-circuit protection unit, the short-circuit protection unit is arranged in series in the driver element and institute
State between luminescence unit, for obtaining the input end signal of the luminescence unit and according to the defeated of the luminescence unit for obtaining
Enter end signal cut-out or turn on the input signal branch road of the luminescence unit, to prevent the anode inside the luminescence unit with the moon
The influence that short circuit between pole is caused to the luminance of the luminescence unit.
Preferably, the short-circuit protection unit includes third transistor and signaling control unit, wherein：
The signaling control unit, its input is connected with the input of the luminescence unit, its output end and described
The control pole of three transistors is connected, the input end signal for obtaining the luminescence unit, and output short-circuit control signal；
The third transistor, its first pole is connected with the output end of the driver element, the second pole and the luminous list
The input connection of unit, for the fault control signal exported according to signaling control unit, cuts off or turns on the luminescence unit
Input signal branch road.
Preferably, the signaling control unit includes judging control unit that its input is defeated with the luminescence unit
Enter end connection, its output end is connected with the control pole of the third transistor, in the luminescence unit working stage, obtaining
The input end signal of luminescence unit, and output short-circuit control signal.
Preferably, the signaling control unit also includes preliminary filling unit, and it is single that the preliminary filling unit is connected on judgement control
Between unit and the control pole of third transistor, for turning on third transistor in luminescence unit non-operational phase, and luminous single
First working stage, by the control pole of fault control signal transmission to third transistor.
Further, the judgement control unit includes the 4th transistor and the 5th transistor, wherein：
4th transistor, its control pole is connected with the input of the luminescence unit, and the first pole is believed with the first level
Number connection, the second pole is connected with the second pole of the 5th transistor；
5th transistor, input of its control pole also with the luminescence unit is connected, the first pole and second electrical level
Signal is connected, and its second pole is connected with the control pole of the third transistor；
Wherein：The type of the 4th transistor and the 5th transistor is opposite.
Further, the precharge unit includes the 6th transistor, the 7th transistor, the 8th transistor and the second electricity
Hold, wherein：
6th transistor, its control pole is connected with the first control signal, and the first pole is connected with three level signal, the
Two poles are connected with the control pole of third transistor；
7th transistor, its control pole is connected with the second control signal, and the first pole is connected with the 4th level signal, the
Two poles are connected with the second pole of the 8th transistor；
8th transistor, its control pole is connected with the 3rd control signal, the first pole with judge the output of control unit
End connection；
Second electric capacity, its first end is connected with the control pole of third transistor, and the of the second end and the 8th transistor
Two poles connect.Preferably, the luminescence unit is organic electroluminescence device, and its anode connects with the short-circuit protection unit
Connect, negative electrode is connected with earth terminal.
A kind of display panel, including above-mentioned image element circuit.
The beneficial effects of the utility model are：The image element circuit, controls to drive OLED to send out by short-circuit protection unit
The closed-loop path of light disconnects, it is to avoid OLED is because of pixel abnormal problem caused by negative electrode and anode in short circuit.Compared to existing technology
The processing method repaired to OLED short circuit using laser ablation methods, this image element circuit prevents the structure of short circuit more
Reliable and stable, method is simple and easy to apply, and need not be further added by laser ablation apparatus.
Brief description of the drawings
Fig. 1 is the structural representation of the image element circuit of the embodiment of the utility model one；
Fig. 2 is the structural representation of the image element circuit of another embodiment of the utility model；
Fig. 3 is the structural representation of the image element circuit of the another embodiment of the utility model；
Fig. 4 is a kind of structural representation of the image element circuit of embodiment of the utility model；
Fig. 5 is the timing diagram of the image element circuit of the utility model Fig. 4；
Specific embodiment
It is below in conjunction with the accompanying drawings and specific real to make those skilled in the art more fully understand the technical solution of the utility model
Mode is applied to be described in further detail the utility model image element circuit and display panel.
Embodiment 1：
The present embodiment provides a kind of image element circuit, and the image element circuit can carry out automatic short-circuit protection, once there are OLED devices
The negative electrode of part causes the situation of short circuit with anode, then the closed-loop path for driving OLED luminous will be controlled to disconnect, and plays short circuit
Protective effect.It is the inquiry bad point and the processing method of laser ablation that prevent short circuit from using, this pixel in compared to existing technology
Circuit simple and stable, and guard method is simple and easy to apply.
As shown in figure 1, the image element circuit includes switch element 1, driver element 2 and luminescence unit 3, also including short-circuit protection
Unit 4, short-circuit protection unit 4 is arranged in series between driver element 2 and luminescence unit 3, the input for obtaining luminescence unit 3
End signal and according to the input end signal of the luminescence unit 3 for obtaining so that its own disconnects or turns on, so as to cut off or turn on hair
The input signal branch road of light unit 3, to prevent the short circuit between the anode and negative electrode inside luminescence unit 3 to luminescence unit 3
The influence that luminance is caused.
As shown in Fig. 2 in the image element circuit, short-circuit protection unit 4 includes third transistor Q3 and signaling control unit 41,
Wherein：
Signaling control unit 41, its input is connected with the input of the luminescence unit 3, its output end and the described 3rd
The control pole of transistor Q3 is connected, the input end signal for obtaining the luminescence unit, and output short-circuit control signal；
The third transistor Q3, its first pole is connected with the output end of the driver element 2, and the second pole is luminous with described
The input connection of unit 3, for the fault control signal exported according to signaling control unit 41, cuts off or turns on and be described luminous
The input signal branch road of unit, so as to play short-circuit protection effect.
Further, as shown in figure 3, signaling control unit 41 includes judging control unit 411, its input and luminous list
The input connection of unit 3, its output end is connected with the control pole of the third transistor Q3, in luminescence unit work
In the stage, the input end signal of luminescence unit is obtained, and according to the signal of luminescence unit input, judge luminescence unit working stage
Whether phenomenon, output short-circuit control signal if being short-circuited.When judgement there occurs short circuit phenomenon, and output short-circuit control signal to cut
The input signal branch road of disconnected luminescence unit, when the phenomenon that is not short-circuited is judged, then output short-circuit control signal causes luminescence unit
Input signal branch road be kept on.
Signaling control unit also includes preliminary filling unit 412, and preliminary filling unit 412 is connected on and judges control unit and the 3rd crystal
Between pipe, for turning on third transistor Q3 in luminescence unit non-operational phase, and in luminescence unit working stage, short circuit is controlled
Signal transmission processed to third transistor control pole.
Precharge unit turns on third transistor Q3 by luminescence unit non-operational phase, it is ensured that initial in luminescence unit
Working stage, its input signal branch road is conducting so that luminous signal can be transmitted smoothly to luminescence unit, prevent from judging control
The erroneous judgement of unit.
Specifically, as shown in figure 4, luminescence unit 3 be organic electroluminescence device (i.e. OLED), its anode with short circuit
Protection location 4 is connected, negative electrode and earth terminal VSSConnection.The anode of luminescence unit 3 receives luminous signal, and according to the electricity for receiving
Flow lights.
Switch element 1 includes the first transistor Q1, and (switching signal end is defeated scanning signal to its control pole with switching signal end
Enter to hold Gate) connection, the first pole is connected with data signal end (data signal end is data signal input Data), the second pole and
The input connection of driver element 2.Switch element 1 is used for scanning element and receives pixel data, used as opening OLED
Control image element circuit.
Driver element 2 includes transistor seconds Q2 and storage capacitance C1, wherein：
Storage capacitance C1, its first end is connected with the control pole of transistor seconds Q2, and the second end is with transistor seconds Q2's
First pole connects；
Transistor seconds Q2, output end of its control pole also with switch element 1 is connected, the first pole also with operating voltage VDDEven
Connect, the second pole is connected with the input of short-circuit protection unit 4.Driver element 2 is used to drive luminescence unit 3, defeated to OLED
Enter the data related to luminous quantity size.
Judge that control unit includes the 4th transistor Q4 and the 5th transistor Q5, wherein：
4th transistor Q4, its control pole is connected with the input of the luminescence unit 3, the first pole and the first level signal
V1 is connected, and the second pole is connected with second pole of the 5th transistor Q5；
5th transistor Q5, input of its control pole also with the luminescence unit 3 is connected, and the first pole is believed with second electrical level
Number V2 connection, its second pole is connected with the control pole of the third transistor Q3；
Wherein：The type of the 4th transistor and the 5th transistor conversely, i.e. described 4th transistor is N-type,
5th transistor is p-type or the 4th transistor is p-type, and the 5th transistor is N-type.
Preliminary filling unit 412 includes the 6th transistor Q6, the 7th transistor Q7, the 8th transistor Q8 and the second electric capacity C2, its
In：
The 6th transistor Q6, its control pole is connected with the first control signal S1, the first pole and three level signal V3
Connection, the second pole is connected with the control pole of third transistor Q3；
The 7th transistor Q7, its control pole is connected with the second control signal S2, the first pole and the 4th level signal V4
Connection, the second pole connects with second pole of the 8th transistor Q8；
The 8th transistor Q8, its control pole is connected with the 3rd control signal S3, the first pole with judge control unit
Output end is connected；The second electric capacity C2, its first end is connected with the control pole of third transistor Q3, the second end and the 8th crystal
The second pole connection of pipe Q8.
Here it will be understood that the control pole of transistor therein corresponds to thin film transistor (TFT) (Thin Film
Transistor, abbreviation TFT) grid, the first pole and the second pole be respectively source/drain and drain/source, i.e. the first pole and
Second pole can be reciprocity, that is to say, that first extremely can be that source electrode can also be drain electrode, and accordingly, second extremely can be
Drain electrode can also be source electrode.
In the present embodiment image element circuit, the first transistor Q1, transistor seconds Q2, the 4th transistor Q4, the 6th crystal
Pipe Q6, the 7th transistor Q7 are P-type transistor, and the 5th transistor Q5 and third transistor Q3 is N-type TFT.Equally should
It should be appreciated that, in a particular application, thin film transistor (TFT) Q1-Q5 can mix from N-type TFT and P in image element circuit
Type thin film transistor (TFT), only needs that the port polarity of the thin film transistor (TFT) Q1-Q5 of selection type is pressed into the present embodiment transistor simultaneously
The port polarity of Q1-Q5 makes corresponding change in connection.It will also be understood that, in the present embodiment image element circuit
Q1-Q5 be also not limited to thin film transistor (TFT), it is any using and image element circuit in there is same process control energy with voltage
The transistor of power is with so that the utility model should be included in the utility model according to the image element circuit of above-mentioned mode of operation
Protection domain in, for example, can be field-effect transistor (Field Effect Transistor, abbreviation FET), more specifically
Can be mos field effect transistor (Metal Oxide Semiconductor Field Effect
Transistor, abbreviation MOS FET), those skilled in the art can be changed according to actual needs, and no longer accompanying drawing is gone to live in the household of one's in-laws on getting married herein
State.
In the image element circuit of the present embodiment, Q1, Q3, Q4, Q5, Q6, Q7 are switch type transistor, and Q2 is driving crystalline substance
Body pipe.
Fig. 5 is the timing diagram of the image element circuit shown in Fig. 4.
One frame is divided into two stages of A and B, the A stages are the non-operational phase of luminescence unit, and B is the work of luminescence unit
Stage.
When luminescence unit is in non-operational phase A, before switching signal end GATE useful signals arrive, the first control letter
Number S1 and the second control signal S2 is input into a significant level signal so that Q6 and Q7 is turned on, and the 3rd control signal S3 is input into a nothing
Effect level signal so that Q8 ends, three level signal V3 and the 4th level signal V4 is transmitted to electric capacity two ends, the level value of V3
Q3 is turned on, the voltage difference at electric capacity two ends is V3-V4.
When luminescence unit is in working stage B, GATE useful signals are arrived, and luminous signal is transmitted to luminous list by Q3
Unit, luminescence unit is operated, meanwhile, S1 and S2 is input into an inactive level signal so that Q6 and Q7 ends, and S3 inputs one are effective
Level signal so that Q8 is turned on.
Now, when luminescence unit OLED is under normal condition：The anode signal of OLED is a high level signal, Q4
Cut-off, Q5 conductings, second electrical level signal V2 is transmitted to the second end of electric capacity, by electric capacity boot strap, the electricity of electric capacity first end
Flat signal value is V3-V4+V2, and the level signal ensures that Q3 is turned on as the input of Q3 so that luminescence unit is in normal condition
Under, Q3 conductings, the input signal branch road conducting of luminescence unit.
Now, when luminescence unit OLED is under short-circuit condition：The anode signal of OLED is a low level signal, Q4
Conducting, Q5 cut-offs, the first level signal V1 is transmitted to the second end of electric capacity, by electric capacity boot strap, the electricity of electric capacity first end
Flat signal value is V3-V4+V1, and the level signal causes that Q3 ends as the input of Q3, so that luminescence unit is in short circuit
Under state, the input signal branch road cut-out of luminescence unit.
In the present embodiment, to ensure Q3 by pre-conditioned conducting and by the first level signal V1, second electrical level signal
V2, three level signal V3, the 4th level signal V4 values meet V3-Vanode1>Vth3；V3-V4+V2-Vanode2>Vth3；
V3-V4+V1-Vanode3<Vth3；
Wherein Vth3 is the threshold voltage of Q3, and Vanode1 is anode for the input end signal of luminescence unit non-operational phase
Signal, about close to the magnitude of voltage of VSS, Vanode2 is the input letter that luminescence unit working stage is in normal operating conditions
Number i.e. anode signal be a high level signal, Vanode3 be luminescence unit working stage be in short-circuit condition input end signal
I.e. anode signal, is Vss.
The useful signal of the first control signal S1 meets turns on Q6, and the useful signal of the second control signal S2 meets makes Q7
Conducting, the useful signal of the 3rd control signal S3 meets turns on Q8.
It can be seen that, in the image element circuit, add short-circuit protection unit 4 to carry out automatic short-circuit protection to OLED.Normally
During work, the anode voltage of OLED is high level, if OLED occurs negative electrode and anode in short circuit, its anode voltage declines
It is low level.In image element circuit, OLED is connected on luminous branch road (VData- as the image element circuit of a mega-ohms
Vss branch roads) in, in the event of negative electrode and the situation of anode in short circuit, the resistance reduction of OLED is then short-circuited even to 0
OLED compared with the OLED not being short-circuited, its anode voltage can be greatly reduced.By in short-circuit protection unit 4
Monitoring of the switching transistor to the anode voltage of OLED, obtain anode voltage, once anode voltage is low, then control is driven
The luminous closed-loop path of dynamic OLED disconnects, and plays automatic short-circuit protection effect.
The image element circuit, controls the closed-loop path for driving OLED luminous to disconnect by short-circuit protection unit, it is to avoid
OLED is because of pixel abnormal problem caused by negative electrode and anode in short circuit.Compared to existing technology using laser ablation methods to OLED
The processing method that shorted devices are repaired, this image element circuit prevents the more reliable stabilization of structure of short circuit, method simple and easy to apply,
And laser ablation apparatus need not be further added by.
Accordingly, the present embodiment also provides a kind of driving method of image element circuit, by switch element 1 and driver element 2
Luminescence unit 3 is driven to light, the driving method includes being obtained by short-circuit protection unit 4 anode signal and root of luminescence unit 3
According to the luminescence unit 3 for obtaining anode signal so that its own disconnect or turn on, so as to cut off or turn on the input of luminescence unit 3
The step of signal branch, to prevent the short-circuit luminance to luminescence unit 3 between the anode and negative electrode inside luminescence unit 3
The influence for causing.Control the closed-loop path for driving OLED luminous to disconnect by short-circuit protection unit 4, play automatic short-circuit guarantor
Shield is acted on.
Specifically, the driving method of the image element circuit includes step：
In working stage：Switching signal causes that switch element 1 is opened, data-signal input driver element 2, driver element 2
Data-signal is received, luminous signal is exported to luminescence unit 3；
The working stage also includes the short-circuit detecting stage：Short-circuit protection unit 4 obtains the input letter of luminescence unit 3
Number and according to the input end signal of the luminescence unit 3 for obtaining cut off or conducting luminescence unit 3 input signal branch road；
Wherein, if OLED occurs the situation of negative electrode and anode in short circuit in luminescence unit 3, in the short-circuit detecting stage：
When the voltage being input into the anode of luminescence unit 3 is the state of high level, the anode voltage of luminescence unit 3 drops to low level,
Then short-circuit protection unit 4 causes that driver element 2 disconnects with luminescence unit 3, with prevent anode inside luminescence unit 3 and negative electrode it
Between the influence that is caused to the luminance of luminescence unit 3 of short circuit.
Further, the short-circuit protection unit of the image element circuit also includes signaling control unit and third transistor, driving side
Method also includes：
In the short-circuit detecting stage, signaling control unit obtains the input end signal of luminescence unit, and output short-circuit control letter
Number, the fault control signal that third transistor is exported according to signaling control unit cuts off or turns on the input of the luminescence unit
Signal branch.
Further, the signaling control unit of the image element circuit also includes judging control unit and preliminary filling unit, driving side
Method also includes：
Non-operational phase, preliminary filling element output signal conducting third transistor；
In the short-circuit detecting stage, judge that control unit obtains the input end signal of luminescence unit, and output short-circuit control letter
Number, preliminary filling unit is by the control pole of fault control signal transmission to third transistor, so as to cut off or turn on the defeated of luminescence unit
Enter signal branch.
It can be seen that, based on the image element circuit, corresponding driving method controls to drive OLED to send out by short-circuit protection unit
The closed-loop path of light disconnects, and plays short-circuit protection effect.
Embodiment 2：
The present embodiment provides a kind of display panel, and the display panel has preferably display performance and display quality.
The display panel includes multiple image element circuits in array arrangement, and the image element circuit is the pixel electricity in embodiment 1
Road.The display panel can be：Electronic Paper, oled panel, mobile phone, panel computer, television set, display, notebook computer, number
Any product or part with display function such as code-phase frame, navigator.
The display panel is as a result of a kind of OLED pixel circuit for carrying out automatic short-circuit protection, therefore the display surface
Plate has more preferable display quality.
It is understood that embodiment of above be merely to illustrate that principle of the present utility model and use it is exemplary
Implementation method, but the utility model is not limited thereto.For those skilled in the art, this is not being departed from
In the case of the spirit and essence of utility model, various changes and modifications can be made therein, and these variations and modifications are also considered as this reality
With new protection domain.
Claims (8)
1. a kind of image element circuit, including switch element, driver element and luminescence unit, it is characterised in that also including short-circuit protection
Unit, the short-circuit protection unit is arranged in series between the driver element and the luminescence unit, for obtaining the hair
The input end signal of light unit simultaneously cuts off according to the input end signal of the luminescence unit or turns on the input of the luminescence unit
Signal branch.
2. image element circuit according to claim 1, it is characterised in that the short-circuit protection unit include third transistor and
Signaling control unit, wherein：
The signaling control unit, its input is connected with the input of the luminescence unit, and its output end is brilliant with the described 3rd
The control pole of body pipe is connected, the input end signal for obtaining the luminescence unit, and output short-circuit control signal；
The third transistor, its first pole is connected with the output end of the driver element, the second pole and the luminescence unit
Input is connected, and for the fault control signal exported according to signaling control unit, cuts off or turn on the defeated of the luminescence unit
Enter signal branch.
3. image element circuit according to claim 2, it is characterised in that the signaling control unit includes judging that control is single
Unit, its input is connected with the input of the luminescence unit, and its output end is connected with the control pole of the third transistor, uses
In in the luminescence unit working stage, the input end signal of luminescence unit, and output short-circuit control signal are obtained.
4. image element circuit according to claim 3, it is characterised in that the signaling control unit also includes preliminary filling unit,
The preliminary filling unit is connected on and judges between control unit and the control pole of third transistor, in luminescence unit inoperative rank
Section conducting third transistor, and in luminescence unit working stage, by the control pole of fault control signal transmission to third transistor.
5. image element circuit according to claim 3, it is characterised in that the judgement control unit includes the 4th transistor
With the 5th transistor, wherein：
4th transistor, its control pole is connected with the input of the luminescence unit, and the first pole connects with the first level signal
Connect, the second pole is connected with the second pole of the 5th transistor；
5th transistor, input of its control pole also with the luminescence unit is connected, the first pole and second electrical level signal
Connection, its second pole is connected with the control pole of the third transistor；
Wherein：The type of the 4th transistor and the 5th transistor is opposite.
6. image element circuit according to claim 4, it is characterised in that the precharge unit includes the 6th transistor, the
Seven transistors, the 8th transistor and the second electric capacity, wherein：
6th transistor, its control pole is connected with the first control signal, and the first pole is connected with three level signal, the second pole
It is connected with the control pole of third transistor；
7th transistor, its control pole is connected with the second control signal, and the first pole is connected with the 4th level signal, the second pole
The second pole with the 8th transistor is connected；
8th transistor, its control pole is connected with the 3rd control signal, and the first pole connects with the output end for judging control unit
Connect；
Second electric capacity, its first end is connected with the control pole of third transistor, the second pole of the second end and the 8th transistor
Connection.
7. image element circuit according to claim 1, it is characterised in that the luminescence unit is organic electroluminescence device,
Its anode is connected with the short-circuit protection unit, and negative electrode is connected with earth terminal.
8. a kind of display panel, it is characterised in that including any described image element circuits of claim 1-7.
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| CN201621476252.2U CN206301579U (en) | 2016-12-29 | 2016-12-29 | Image element circuit and display panel |
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| US10643728B2 (en) | 2016-04-25 | 2020-05-05 | Hefei Boe Optoelectronics Technology Co., Ltd. | Display driving circuit, driving method thereof, and display device |
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