CN109545135A - A kind of driving method and device of OLED lighting screen body - Google Patents
A kind of driving method and device of OLED lighting screen body Download PDFInfo
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- CN109545135A CN109545135A CN201811484503.5A CN201811484503A CN109545135A CN 109545135 A CN109545135 A CN 109545135A CN 201811484503 A CN201811484503 A CN 201811484503A CN 109545135 A CN109545135 A CN 109545135A
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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]
Abstract
Based on technical solution a certain in the application, after the failure occurs, it can be by starting reverse drive voltages mode, that is: apply backward voltage for OLED lighting screen body, current fusing fuse is concentrated through with the pixel that OLED lighting screen body will go wrong or the pixel for having already appeared problem, there is hidden danger before preventing next use, OLED product reliability and user experience are improved by the method.Based on technical solution another in the application, before the failure occurs, it can be by starting reverse drive voltages mode, that is: apply backward voltage for OLED lighting screen body, current fusing fuse is concentrated through with the pixel that OLED lighting screen body is had already appeared problem, there is hidden danger before preventing next use, OLED product reliability and user experience are improved by the method.
Description
Technical field
The present disclosure relates generally to OLED lighting screen body technique fields, and in particular to a kind of driving method of OLED lighting screen body
And device.
Background technique
The basic structure of organic electroluminescence device (Organic Light EmittingDevices, abbreviation OLED) is:
Organic light-emitting units are set in the confined space that a glass substrate and cap are formed, organic light-emitting units include anode, have
Each layer such as machine luminescent layer, cathode, anode, cathode are drawn in non-light-emitting area position by lead, with integrated circuit (IC) or flexible electrical
Road plate (FPC) carries out bonding.
It is inevitably present dust granule, burr, pin hole, crackle the defects of point during the manufacture of OLED screen body, and
The usual very little of the distance between anode and cathode of OLED screen body (about tens of to hundreds of nanometers).As a result, in this state, sun
Pole may directly be contacted with cathode causes the organic layer between defect (referred to as short dot) or anode and cathode that can become to compare
Other positions are thin.When OLED device work, electric current more tends to from this defect point rather than passes through from other positions, so that
Heat is accumulated at this defect point, so as to cause the quality and reliability for damaging entire OLED screen body.
The OLED screen body with " fusing type short circuit prevention structure " is had existed in the prior art, and such short-circuit protection structure is
Pixel one low resistance fuse of series connection in OLED screen body, fuse fever easily fusing, once short trouble occurs, greatly
The electric current of amount can flow through the luminous zone pixel and concatenated fuse where the circuit defect, generate heat and the guarantor inside it that fuses
Dangerous silk, to protect OLED screen body.Therefore it has following characteristics: one is: single-point, short-circuit point fuse play a role, and protect
Dangerous silk fusing becomes open circuit by short circuit；The second is: passive type needs enough electric currents and generates heat and could fuse, if electric current
Deficiency, can not fuse wire, therefore this kind of circuit structure can guarantee the insurance that can fuse every time by self-healing completely
Silk, it would be highly desirable to improve.
For another " connector type short circuit prevention structure " existing in the prior art, such short-circuit protection structure is in OLED screen body
In sub- luminous zone connect a high resistance connector, it is therefore an objective to pixel occur short circuit when reduce short circuit current, short circuit current is not
More than the 10% of total current, completely contradict with " fusing type short circuit prevention structure ", such circuit protection structure, once short circuit event occurs
Barrier can reduce short circuit current, and short circuit current is no more than the 10% of total current, has following characteristics: one is: single-point, it is short
Connector plays a role at waypoint, and connector can reduce short circuit current；The second is: passive type, only pixel short circuit Shi Caihui
It has an effect, therefore this kind of circuit structure can not self-healing pixel shorts point, it would be highly desirable to improve.
Therefore, the result to avoid OLED screen body to fail to the maximum extent occurs, and OLED screen body can be into after the completion of production
A possibility that row defect screening, there are certain missing inspections in view of screening, therefore design driven circuit reply product is needed to flow into client
When circuit defect that may be present.
Summary of the invention
In view of drawbacks described above in the prior art or deficiency, it is intended to provide one kind compared to existing technologies, Neng Gouti
The driving method and device of the OLED lighting screen body of high OLED lighting screen body reliability, especially to the OLED with short circuit prevention structure
Shield body.
In a first aspect, a kind of driving method of OLED lighting screen body, includes the following steps:
Before starting OLED lighting screen body, judge whether it occurs short trouble；
If short trouble occurs in it, starts reverse drive voltages mode and maintain certain time；
Judge whether OLED lighting screen body is repaired normally.
Further include following steps according to technical solution provided by the embodiments of the present application: if judging, OLED lighting screen body is not repaired
It is multiple normal, then n times starting backward voltage mode (N >=2).
According to technical solution provided by the embodiments of the present application, the OLED lighting screen body uses fusing type short circuit prevention structure,
When OLED lighting screen bulk voltage is less than rated value, that is, determine to break down.
According to technical solution provided by the embodiments of the present application, the reverse drive voltages value is positive drive voltage maximum value
1-10 times.
According to technical solution provided by the embodiments of the present application, the starting time of reverse drive voltages mode described in single be less than
Equal to 5ms.
A kind of second aspect, driving method of OLED lighting screen body, includes the following steps:
It closes after OLED lighting screen body；
Judge whether OLED lighting screen body closes；
If it is closed, starts reverse drive voltages mode and maintain certain time.
According to technical solution provided by the embodiments of the present application, the reverse drive voltages value is positive drive voltage maximum value
Obtain 1-10 times.
According to technical solution provided by the embodiments of the present application, the starting time of reverse drive voltages mode described in single be less than
Equal to 5ms.
The third aspect, a kind of driving device of OLED lighting screen body, comprising: the first driving power drives with described first
The positive switch element of power electric connection and the OLED lighting screen body being connected with the positive switch element；Further include: second drives
Dynamic power supply and the inverting switching element being electrically connected with second driving power, the inverting switching element and the OLED are illuminated
Shield body to be connected；The forward direction switch element, including the first positive switch element and the second positive switch element, described first is positive
The output end of switch element is connected with the anode of OLED lighting screen body and the input terminal of the second positive switch element and OLED are illuminated
The cathode for shielding body is connected；The inverting switching element, including the first inverting switching element and the second inverting switching element, described
The output end of one inverting switching element be connected with the cathode of OLED lighting screen body and the input terminal of the second inverting switching element with
The anode of OLED lighting screen body is connected.
According to technical solution provided by the embodiments of the present application, the described first, second positive switch element is respectively positive-negative-positive three
Pole pipe Q1 and triode Q4；The output end of first driving power is connected with the emitter of the triode Q1 and three pole
The collector of pipe Q1 is connected with the anode of the OLED lighting screen body；The cathode of the OLED lighting screen body and the triode Q4
Emitter be connected and the grounded collector of the triode Q4；First, second inverting switching element is PNP type triode
Q3 and triode Q2；The output end of second driving power is connected with the emitter of the triode Q3 and the triode Q3
Collector be connected with the cathode of the OLED lighting screen body；The hair of the anode of the OLED lighting screen body and the triode Q2
Emitter-base bandgap grading is connected and the grounded collector of the triode Q2；The base stage of described Q1, Q2, Q3 and Q4 are connected with control unit.
According to technical solution provided by the embodiments of the present application, further includes: voltage comparator, the two of the OLED lighting screen body
End is respectively connected to the output access control unit of the input of the voltage comparator and the voltage comparator.
According to technical solution provided by the embodiments of the present application, set in described control unit there are four PWM generating device.
In conclusion the technical solution based on above-mentioned first aspect can be driven in the reverse direction after the failure occurs by starting
Voltage mode, it may be assumed that for OLED lighting screen body apply backward voltage, the pixel that OLED lighting screen body will be gone wrong or
The pixel for having already appeared problem is concentrated through current fusing fuse, hidden danger occurs before preventing next use, passes through the method
Improve OLED product reliability and user experience.
Based on the technical solution of above-mentioned second aspect, before the failure occurs, can by start reverse drive voltages mode,
That is: before OLED lighting screen body does not break down, confirmation OLED lighting screen body passes through switching OLED lighting screen body after closing
To be driven in the reverse direction, fused so that the pixel of short circuit will likely occur by reverse current, this driving method is OLED lighting screen body
The pre- measure of relief before breaking down improves OLED product reliability and user experience by the method.
It can be by forward driving by the way that specific driving circuit structure is arranged based on the technical solution of the above-mentioned third aspect
It OLED lighting screen body and is driven in the reverse direction OLED lighting screen body and is concentrated among same structure, be easy to implement centralized control, in conjunction with the
On the one hand with the driving method of second aspect, OLED effectively can be improved by the driving method of first aspect and second aspect
Lighting screen body reliability and user experience.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other
Feature, objects and advantages will become more apparent upon:
Fig. 1 is the workflow schematic diagram of embodiment one in the application；
Fig. 2 is the workflow schematic diagram of embodiment two in the application；
Fig. 3 is the electrical block diagram of embodiment three in the application；
Fig. 4 is the time sequence status contrast schematic diagram of circuit structure in Fig. 3；
Fig. 5 is the forward driving pattern diagram of circuit structure in Fig. 3；
Fig. 6 is the reverse drive mode schematic diagram of circuit structure in Fig. 3；
Fig. 7 is the structural schematic diagram of the control unit of circuit structure in Fig. 3；
Fig. 8 is the structural schematic diagram (voltage comparator) of the control unit of circuit structure in Fig. 3.
Specific embodiment
The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining related invention, rather than the restriction to the invention.It also should be noted that in order to
Convenient for description, part relevant to invention is illustrated only in attached drawing.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Embodiment one:
Please refer to a kind of driving method of OLED lighting screen body disclosed in Fig. 1.
The driving method of OLED lighting screen body in the present embodiment, central principle are: when OLED lighting screen body occurs
It is to be driven in the reverse direction by switching OLED lighting screen body when failure, the pixel of short circuit will likely occur or have occurred and that short circuit
Pixel respectively by reverse current fuse, this driving method be OLED lighting screen body break down after the measure of relief, tool
Include the following steps: to body
Start OLED lighting screen body, judges whether it breaks down；This step is the primitive decision of failure, and the failure is
The situation of short trouble.
If it breaks down, starts reverse drive voltages mode and maintain certain time；Based on previous step, determination is rescued
Ji method, the reverse drive voltages mode are by the switch motion in switching OLED lighting screen body driving circuit, are OLED
Lighting screen body applies backward voltage.Preferably, the reverse drive voltages value is 1-10 times of positive drive voltage maximum value.
It can efficiently and safely puncture under reverse drive voltages mode for realization and have occurred and that failure or will occur
Failed shorted point, reverse drive voltages value can be 1 times of positive drive voltage maximum value.
The difference of the principle or size that are formed in view of short dot, the reverse drive voltages value of single quota is possibly can not
Disposably clear all short dot, therefore reverse drive voltages value can also be 1.25 times of positive drive voltage maximum value, 1.5 times,
1.75 times, 2 times, 3 times, 5 times, 7 times, 10 times.
Certainly, specifically selection needs to be set according to the practical rated value of OLED lighting screen body.
Certainly, reverse drive voltages value is larger by process conditions, preferably gropes optimum value using experiment.
Judge whether OLED lighting screen body is repaired normally.It needs to carry out the reparation result of OLED lighting screen body in this step
Judgement, judgment method are as follows: starting OLED lighting screen body is tested and judged.If OLED lighting screen body can normally start,
It repairs normal；If OLED lighting screen body can not normally start, determine to repair abnormal.Preferably, the OLED lighting screen body
Using fusing type short circuit prevention structure, when OLED lighting screen bulk voltage is less than rated value, that is, determine to break down.
" rated value " is the voltage rating of OLED lighting screen body, and the material of design and use etc. with screen body is because being known as
It closes.
After primary reparation is completed, to further include as follows in any preferred embodiment convenient for continuing to repair
Step: if OLED lighting screen body is not repaired normally, n times start backward voltage mode (N >=2).In this step, when occur not
When repairing normal, backward voltage mode can be started by n times and continue to repair.This step designed in view of
A possibility that potential short circuit pixel.Certainly, if repeatedly starting can not still repair normal, determine OLED lighting screen body
Failure.
To avoid causing to damage to OLED lighting screen body, in any preferred embodiment, electricity is driven in the reverse direction described in single
Die pressing type starts the time as less than or equal to 5ms.
Embodiment two:
Please refer to a kind of driving method of OLED lighting screen body disclosed in Fig. 2.
The driving method of OLED lighting screen body in the present embodiment, central principle are: not sending out in OLED lighting screen body
Before raw failure, confirmation OLED lighting screen body passes through switching OLED lighting screen body after closing be to be driven in the reverse direction, will likely send out
The pixel of raw short circuit is fused by reverse current, this driving method is the pre- relief side before OLED lighting screen body breaks down
Method specifically includes the following steps:
A kind of driving method of OLED lighting screen body, includes the following steps:
After starting OLED lighting screen body, OLED lighting screen body is closed；
Judge whether OLED lighting screen body closes；This step is to shield the primitive decision of body, and the OLED lighting screen body should be true
Recognize closing.
If it is closed, starts reverse drive voltages mode and maintain certain time.Based on previous step, pre- relief is determined
Method, the reverse drive voltages mode are to be shone by the switch motion in switching OLED lighting screen body driving circuit for OLED
Bright screen body applies backward voltage.Preferably, the reverse drive voltages value is 1-10 times of positive drive voltage maximum value.
To avoid causing to damage to OLED lighting screen body, in any preferred embodiment, electricity is driven in the reverse direction described in single
Die pressing type starts the time as less than or equal to 5ms.
Embodiment three:
Please refer to a kind of driving device of OLED lighting screen body disclosed in Fig. 3, Fig. 4, Fig. 5 and Fig. 6.
The driving device of the OLED lighting screen body, comprising: the first driving power is electrically connected with first driving power
Positive switch element and the OLED lighting screen body that is connected with the positive switch element；Further include: the second driving power and with
The inverting switching element of the second driving power electrical connection, the inverting switching element are connected with the OLED lighting screen body；
The forward direction switch element, including the first positive switch element and the second positive switch element, the described first positive switch element
Output end be connected with the anode of OLED lighting screen body and the yin of the input terminal of the second positive switch element and OLED lighting screen body
Extremely it is connected；The inverting switching element, including the first inverting switching element and the second inverting switching element, described first reversely opens
The output end for closing element is connected with the cathode of OLED lighting screen body and the input terminal of the second inverting switching element and OLED lighting screen
The anode of body is connected.
In the above-described embodiments, forward driving circuit includes: the first driving power, is electrically connected with first driving power
Positive switch element and the OLED lighting screen body that is connected with the positive switch element.
Wherein:
The forward direction switch element, including the first positive switch element and the second positive switch element, described first is positive
The output end of switch element is connected with the anode of OLED lighting screen body and the input terminal of the second positive switch element and OLED are illuminated
The cathode for shielding body is connected；
In the above-described embodiments, reverse driving circuit includes: the second driving power and is electrically connected with second driving power
The inverting switching element connect, the inverting switching element are connected with the OLED lighting screen body.
Wherein:
The inverting switching element, including the first inverting switching element and the second inverting switching element, described first is reversed
The output end of switch element is connected with the cathode of OLED lighting screen body and the input terminal of the second inverting switching element and OLED are illuminated
The anode for shielding body is connected.This i.e. reverse drive mode described in embodiment one and two.
The first forward direction is opened simultaneously by closing the first reverser and the second reverser based on foregoing circuit structure
Switch and the second positive switch, are switched to forward driving circuit state.
Based on foregoing circuit structure, is switched by closing the first positive switch and the second forward direction, it is reversed to open simultaneously first
Switch and the second reverser, are switched to reverse driving circuit state.
Based on above-mentioned analysis, the circuit structure therefore in the present embodiment can cooperate the specific drive of embodiment one and embodiment two
Dynamic method uses.
Electrical block diagram shown in Fig. 3 is please referred to, specifically to realize above-mentioned forward driving circuit structure and reversed
Driver circuit structure, in any preferred embodiment, the described first, second positive switch element is respectively PNP type triode
Q1 and triode Q4；The output end of first driving power is connected with the emitter of the triode Q1 and the triode Q1
Collector be connected with the anode of the OLED lighting screen body；The hair of the cathode of the OLED lighting screen body and the triode Q4
Emitter-base bandgap grading is connected and the grounded collector of the triode Q4；First, second inverting switching element be PNP type triode Q3 and
Triode Q2；The output end of second driving power is connected with the emitter of the triode Q3 and the collection of the triode Q3
Electrode is connected with the cathode of the OLED lighting screen body；The emitter of the anode of the OLED lighting screen body and the triode Q2
The grounded collector of the connected and described triode Q2；The base stage of described Q1, Q2, Q3 and Q4 are connected with control unit.
Time sequence status contrast schematic diagram shown in Fig. 4 is please referred to,
Wherein:
The top timing diagram in position is the time-state method of OLED lighting screen body；
The timing diagram of position on the lower is the time-state method of driving circuit in Fig. 3.
Concrete analysis about Fig. 4 is as follows:
T0-t1: product is in off state, and output electric current is 0A, and driving circuit does not come into operation state.
T1: product switch is opened at this time, and product will start to work.
T1-t2: circuit output back-pressure impact screen body blows it if there is short-circuit pixel, driving circuit Fig. 6
It is shown.
T2-t3: circuit output forward current, screen body are normally lighted, and driving circuit is shown in Fig. 5.
T3: product switch is closed, and product stops working, and screen body extinguishes.
T3-t4: circuit output back-pressure impact screen body blows it if there is the short-circuit pixel not blown, driving electricity
Road is shown in Fig. 6.
Referring to FIG. 5, in foregoing circuit structure, forward driving circuit are as follows: the output end of first driving power with
The emitter of the triode Q1 is connected and the collector of the triode Q1 is connected with the anode of the OLED lighting screen body；Institute
The cathode for stating OLED lighting screen body is connected with the emitter of the triode Q4 and the grounded collector of the triode Q4.
Referring to FIG. 6, reverse driving circuit includes: the output end of second driving power in foregoing circuit structure
It is connected with the emitter of the triode Q3 and the collector of the triode Q3 is connected with the cathode of the OLED lighting screen body；
The anode of the OLED lighting screen body is connected with the emitter of the triode Q2 and the grounded collector of the triode Q2.
To realize that the base stage of described Q1, Q2, Q3 and Q4 are equal to the switching between forward driving circuit and reverse driving circuit
It is connected with control unit, please refers to Fig. 7.Specifically, described control unit can be with are as follows: STM32 series monolithic, concrete model example
Such as STM32F103ZET6.
Fig. 3 and Fig. 8 are please referred to, in any preferred embodiment, further includes: voltage comparator, the OLED lighting screen
The both ends (that is: the voltage value of V1 point and V2 point) of body are respectively connected to the input terminal of the voltage comparator and the voltage comparator
Output access control unit.
To be monitored convenient for the voltage to OLED lighting screen body, and determine the structure of voltage monitoring as control unit
Whether OLED lighting screen body is in the condition of malfunction.
Such as:
Under normal circumstances, OLED lighting screen body both end voltage is 6V or more.At this point, the output end of voltage comparator is to institute
Control unit input Normal Feedback signal is stated, so that control unit keeps the state of forward driving circuit.
In case of a fault, when short circuit occurs for OLED lighting screen body, both end voltage is probably even lower in 1V or so.
At this point, the output end of voltage comparator is to described control unit input fault feedback signal, so that control unit is switched to reversely
The state of driving circuit.
Preferably, to control convenient for control unit Q1, Q2, Q3 and Q4 in circuit shown in Fig. 3, any excellent
PWM generating device there are four being set in the embodiment of choosing, in described control unit.
There are four PWM generating device, the output of each PWM generating device and the outputs of control unit in described control unit
It is connected, and control unit device output end is connected with the base stage of described Q1, Q2, Q3 and Q4 respectively.
Under OLED lighting screen body normal operating conditions, it is equipped with the adjustable screen body light emission luminance of PWM generating device, that is, is shielded
In body ignition different illuminating effects can be realized by being secretly changed to bright.
When OLED lighting screen body breaks down and control unit control driving circuit switches to reverse drive mode, moreover it is possible to
Enough frequencies by changing PWM then change the driving voltage realization being applied on Q3 and Q2 and carry out impact reparation to short dot.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.Those skilled in the art
Member is it should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
Any combination and the other technical solutions formed.Such as features described above has similar function with (but being not limited to) disclosed herein
Can technical characteristic replaced mutually and the technical solution that is formed.
Claims (10)
1. a kind of driving method of OLED lighting screen body, characterized by the following steps:
Before starting OLED lighting screen body, judge whether it occurs short trouble；
If short trouble occurs in it, starts reverse drive voltages mode and maintain certain time；
Judge whether OLED lighting screen body is repaired normally.
2. a kind of driving method of OLED lighting screen body according to claim 1, it is characterised in that: further include walking as follows
Rapid: if judging, OLED lighting screen body is not repaired normally, and n times start backward voltage mode (N >=2).
3. a kind of driving method of OLED lighting screen body according to claim 1, it is characterised in that: the OLED lighting screen
Body uses fusing type short circuit prevention structure, when OLED lighting screen bulk voltage is less than rated value, that is, determines to break down.
4. a kind of driving method of OLED lighting screen body, characterized by the following steps:
It closes after OLED lighting screen body；
Judge whether OLED lighting screen body closes；
If it is closed, starts reverse drive voltages mode and maintain certain time.
5. a kind of driving method of OLED lighting screen body according to any one of claims 1 to 4, it is characterised in that: described
Reverse drive voltages value is 1-10 times of positive drive voltage maximum value.
6. according to claim 1 to a kind of driving method of OLED lighting screen body of 4 any one, it is characterised in that: described in single
Reverse drive voltages mode starts the time as less than or equal to 5ms.
7. a kind of driving device of OLED lighting screen body, it is characterised in that: include: the first driving power and first driving
The positive switch element of power electric connection and the OLED lighting screen body being connected with the positive switch element；Further include: second drives
Dynamic power supply and the inverting switching element being electrically connected with second driving power, the inverting switching element and the OLED are illuminated
Shield body to be connected；
The forward direction switch element, including the first positive switch element and the second positive switch element, the described first positive switch
The output end of element is connected with the anode of OLED lighting screen body and the input terminal and OLED lighting screen body of the second positive switch element
Cathode be connected；
The inverting switching element, including the first inverting switching element and the second inverting switching element, first reverser
The output end of element is connected with the cathode of OLED lighting screen body and the input terminal of the second inverting switching element and OLED lighting screen body
Anode be connected.
8. a kind of driving device of OLED lighting screen body according to claim 7, it is characterised in that: described first, second
Positive switch element is respectively PNP type triode Q1 and triode Q4；The output end of first driving power and three pole
The emitter of pipe Q1 is connected and the collector of the triode Q1 is connected with the anode of the OLED lighting screen body；The OLED shines
The cathode of bright screen body is connected with the emitter of the triode Q4 and the grounded collector of the triode Q4；Described first,
Two inverting switching elements are PNP type triode Q3 and triode Q2；The output end and the triode of second driving power
The emitter of Q3 is connected and the collector of the triode Q3 is connected with the cathode of the OLED lighting screen body；The OLED illumination
The anode of screen body is connected with the emitter of the triode Q2 and the grounded collector of the triode Q2；Described Q1, Q2, Q3 and
The base stage of Q4 is connected with control unit.
9. a kind of driving device of OLED lighting screen body according to claim 7 or 8, it is characterised in that: further include: voltage
Comparator, the both ends of the OLED lighting screen body be respectively connected to the voltage comparator input and the voltage comparator it is defeated
Control unit is accessed out.
10. a kind of driving device of OLED lighting screen body according to claim 8, it is characterised in that: described control unit
PWM generating device there are four inside setting.
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| CN111369933A (en) * | 2020-03-23 | 2020-07-03 | 京东方科技集团股份有限公司 | Sub-pixel circuit, pixel driving method, display panel and display device |
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| CN111369933B (en) * | 2020-03-23 | 2021-08-24 | 京东方科技集团股份有限公司 | Sub-pixel circuit, pixel driving method, display panel and display device |
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| CN109545135B (en) | 2021-07-20 |
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