CN107863070A - A kind of active OLED pixel-driving circuit - Google Patents
A kind of active OLED pixel-driving circuit Download PDFInfo
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- CN107863070A CN107863070A CN201711400864.2A CN201711400864A CN107863070A CN 107863070 A CN107863070 A CN 107863070A CN 201711400864 A CN201711400864 A CN 201711400864A CN 107863070 A CN107863070 A CN 107863070A
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- semiconductor
- oxide
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- oled
- oled pixel
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention discloses a kind of active OLED pixel-driving circuit, including metal-oxide-semiconductor T1, metal-oxide-semiconductor T2, metal-oxide-semiconductor T3, storage capacitance Cs, OLED pixel, the grid connection control signal of the metal-oxide-semiconductor T1, the source class connection data wire of the metal-oxide-semiconductor T1；The drain of storage capacitance Cs one end connection metal-oxide-semiconductor T1, other end connection metal-oxide-semiconductor T2 drain；The grid of the metal-oxide-semiconductor T2 is connected on the circuit that storage capacitance Cs is connected with metal-oxide-semiconductor T1, and power supply is connected with the circuit that storage capacitance Cs is connected with metal-oxide-semiconductor T2；The drain connection metal-oxide-semiconductor T2 of metal-oxide-semiconductor T3 source class, the grid connection control signal of the metal-oxide-semiconductor T3, the anode of the drain connection OLED pixel of the metal-oxide-semiconductor T3, the minus earth of OLED pixel.The invention provides two tube voltage type active pixel drive circuits; the parameter of each device of circuit is selected; influence to be analyzed and improved for the weak point of circuit to caused by data fluctuations OLED, serving prevents the generation of electric current by mistake and the protective effect to OLED.
Description
Technical field
The present invention relates to circuit field, and in particular to a kind of active OLED pixel-driving circuit.
Background technology
With making rapid progress for scientific technological advance, within more than the 10 short years, FPD has developed rapidly
Get up, and every family is spread to by feat of the advantage of cost performance.Wherein, the yield of liquid crystal display and occupation rate of market are with height
The swift and violent trend of speed advances.Undeniably, liquid crystal display has a low power consuming, and radiating is small, it is slim light and handy the advantages that, but
The shortcomings that can not overcoming there is some.Another FPD-OLED was applied in digital camera, mobile phone since 2003
Deng on digital product, compared with LCD, there is very big advantage in terms of thickness, shock resistance, visual angle, power consumption, and can be by electricity
Road is printed on the soft display device made and can bent on elastomeric material, thus is referred to as " LCD killer " by many people.
OLED is different according to its type of drive, can be divided into PM-OLED (PassiveMatrixOLED, passive drive
It is dynamic) and AM-OLED (ActiveMatrixOLED, active matrix driving).PM-OLED requires that the efficiency of luminescent device and brightness are very high,
So that PM-OLED can not meet high-resolution and the requirement that large information capacity is shown.
The content of the invention
The present invention is in order to solve the above problems, and it is an object of the present invention to provide a kind of active OLED pixel-driving circuit.
The present invention is achieved through the following technical solutions：
A kind of active OLED pixel-driving circuit, including metal-oxide-semiconductor T1, metal-oxide-semiconductor T2, metal-oxide-semiconductor T3, storage capacitance Cs, OLED
Pixel, metal-oxide-semiconductor T1 grid connection control signal, metal-oxide-semiconductor T1 source class connection data wire；Storage capacitance Cs one end connection
Metal-oxide-semiconductor T1 drain, other end connection metal-oxide-semiconductor T2 drain；The grid of the metal-oxide-semiconductor T2 is connected to storage capacitance Cs and MOS
On the circuit of pipe T1 connections, power supply is connected with the circuit that storage capacitance Cs is connected with metal-oxide-semiconductor T2；The leakage of the metal-oxide-semiconductor T3
Level connection metal-oxide-semiconductor T2 source class, the grid connection control signal of the metal-oxide-semiconductor T3, the drain connection OLED pictures of the metal-oxide-semiconductor T3
The anode of element, the minus earth of OLED pixel.
Further, metal-oxide-semiconductor T1, metal-oxide-semiconductor T2, metal-oxide-semiconductor T3 use IRFZ20.
Further, metal-oxide-semiconductor T1, metal-oxide-semiconductor T2, metal-oxide-semiconductor T3 use IRFZ20F1.
The present invention compared with prior art, has the following advantages and advantages：The invention provides two tube voltage types
Active pixel drive circuit, is selected the parameter of each device of circuit, influences to divide to caused by data fluctuations OLED
The weak point analysed and be directed to circuit is improved, and serving prevents the generation of electric current by mistake and the protective effect to OLED.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is schematic structural view of the invention；
Fig. 2 is prior art circuits figure of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment
As shown in Fig. 2 in the prior art, active two tube voltages type pixel-driving circuit structure wherein, scan line (Vsel)
For grid gating signal wire, data wire (Vdata) is data signal line.T1 is switching tube, and T2 is driving tube, and Cs is storage electricity
Hold.The operation principle of active two pipes pixel-driving circuit is：When grid gating signal is low level, pixel is strobed.T1 is managed
Open, into linear working state.Data-signal passes to the grid of T2 pipes, T2 is guaranteed adequate food and the source-drain current driving of T2 pipes
OLED lights, and Cs starts discharge and recharge, and Cs both end voltages are corresponding with data-signal.When grid gating signal is high level, as
Element is not gated on.T1 ends, and data-signal can not reach T2 grid.Cs continues to T2 saturations, and driving OLED lights.Driving
The condition that circuit is capable of normal work is：In gating time, switch transistor T 1 must operate at linear working state.In whole frame
In cycle, driving tube T2 must operate at saturation state.The Cs discharge and recharge time must be smaller than gating time, so can just make
Cs completes whole charge and discharge process at the end of pixel gates.In view of factors such as warpage response, charging interval, aperture opening ratios,
Final 10 μm/10 μm of breadth length ratio for determining T1, T2 pipe, 25 μm/20 μm, electric capacity Cs=115pF.
Interior T1 pipes are opened during gating, data-signal to electric capacity Cs discharge and recharges, input signal cable may due to it is extraneous because
The influence of element produces very short fluctuation, because in gating time, OLED electric current has directly reacted data-signal, then
Transient change can also occur for OLED electric current, influence OLED luminosity, cause the inaccuracy of output data.More importantly
The fluctuation of data-signal is excessive, and huge electric current may be brought to OLED, and this can reduce OLED service life.
As shown in figure 1, a kind of active OLED pixel-driving circuit, including metal-oxide-semiconductor T1, metal-oxide-semiconductor T2, metal-oxide-semiconductor T3, storage electricity
Hold Cs, OLED pixel, metal-oxide-semiconductor T1 grid connection control signal, the source class connection data wire of the metal-oxide-semiconductor T1；The storage
Electric capacity Cs one end connection metal-oxide-semiconductor T1 drain, other end connection metal-oxide-semiconductor T2 drain；The grid of the metal-oxide-semiconductor T2, which is connected to, to be deposited
Storing up electricity is held on the circuit that Cs is connected with metal-oxide-semiconductor T1, and power supply is connected with the circuit that storage capacitance Cs is connected with metal-oxide-semiconductor T2；Institute
State metal-oxide-semiconductor T3 drain connection metal-oxide-semiconductor T2 source class, the grid connection control signal of the metal-oxide-semiconductor T3, the metal-oxide-semiconductor T3's
Drain connects the anode of OLED pixel, the minus earth of OLED pixel.Metal-oxide-semiconductor T1, metal-oxide-semiconductor T2, metal-oxide-semiconductor T3 are used
IRFZ20.Metal-oxide-semiconductor T1, metal-oxide-semiconductor T2, metal-oxide-semiconductor T3 use IRFZ20F1.
Wherein T1 and T3 is switching tube, and T2 is driving tube, and scan line Vsel1 and Vsel2 are grid control signal line, in office
For the signal phase sequence of moment two of anticipating on the contrary, data wire (Vdata) is source data signal wire, Cs is storage capacitance.
(1) when Vsel1 is low level, and Vsel2 is high level, pixel is strobed, into programming phases.T1 pipes are beaten
Open, into linear working state, T3 pipes are in cut-off state.Data-signal passes to the grid of T2 pipes by T1 pipes, starts Cs
Discharge and recharge.But because T3 pipes end, in theory without electric current by OLED, therefore, OLED does not light now.
(2) when Vsel1 is high level, and Vsel2 is low level, pixel is not strobed, into the stage of holding.T1 pipes close
Close, into cut-off state.T3 pipes are opened, into linear working state.Because without bleed-off circuit, the voltage at electric capacity both ends
It can keep constant, driving tube T2 enters saturation state.Again because T3 pipes are opened, the leakage current of T2 pipes flows into by T3 pipes
OLED, then now OLED starts to light.The advantages of 21212 this circuit, T3 pipes were in cut-off when gate data line is addressed
State.If now data-signal generates fluctuation, T3 pipes can stop the electric current that disconnected data-signal is excited and flow into luminous list
Member, therefore, play a part of preventing electric current appearance by mistake and protection OLED to a certain extent.
Switch tube T3 parameter is selected.T3 is in cut-off state in gating time, and T3 leakage current is to OLED
Brightness can also produce direct influence.If, will not be right it is generally acknowledged that voltage change is in the range of the gray scale level of circuit
OLED brightness causes very big influence.Because TFT leakage current is directly proportional to TFT channel width, reduce T3 raceway groove
Width can effectively reduce leakage current, so as to reduce the influence to OLED.Meanwhile in order to distortionless transmission data-signal,
T3 length is unsuitable excessive.The problem of in view of technique etc., the breadth length ratio for finally determining T3 are W/L=10 μm/10 μm.
Each pixel of AM-OLED display screens except with luminescent material in itself in addition to, be also integrated with its substrate more
Individual TFT (thinfilmtransistor, thin film transistor (TFT)), lasting working signal can be provided within the whole frame period, is overcome
The problem of being brought using the small pulse signal of dutycycle, large area, high-resolution display are advantageously implemented, thus, it is near several
Widely had an optimistic view of over year.Invention broadly provides two tube voltage type active pixel drive circuits, to the ginseng of each device of circuit
Number is selected, and is influenceed to be analyzed to caused by data fluctuations OLED and is improved for the weak point of circuit, is risen
Protective effect to the generation for preventing from missing electric current and to OLED.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.
Claims (3)
1. a kind of active OLED pixel-driving circuit, it is characterised in that including metal-oxide-semiconductor T1, metal-oxide-semiconductor T2, metal-oxide-semiconductor T3, storage electricity
Hold Cs, OLED pixel, the grid connection control signal of the metal-oxide-semiconductor T1, the source class connection data wire of the metal-oxide-semiconductor T1；It is described
Storage capacitance Cs one end connection metal-oxide-semiconductor T1 drain, other end connection metal-oxide-semiconductor T2 drain；The grid connection of the metal-oxide-semiconductor T2
On the circuit that storage capacitance Cs is connected with metal-oxide-semiconductor T1, electricity is connected with the circuit that storage capacitance Cs is connected with metal-oxide-semiconductor T2
Source；The drain connection metal-oxide-semiconductor T2 of metal-oxide-semiconductor T3 source class, the grid connection control signal of the metal-oxide-semiconductor T3, the metal-oxide-semiconductor
The anode of T3 drain connection OLED pixel, the minus earth of OLED pixel.
2. a kind of active OLED pixel-driving circuit according to claim 1, it is characterised in that described metal-oxide-semiconductor T1, MOS
Pipe T2, metal-oxide-semiconductor T3 use IRFZ20.
3. a kind of active OLED pixel-driving circuit according to claim 1, it is characterised in that described metal-oxide-semiconductor T1, MOS
Pipe T2, metal-oxide-semiconductor T3 use IRFZ20F1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711400864.2A CN107863070A (en) | 2017-12-22 | 2017-12-22 | A kind of active OLED pixel-driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711400864.2A CN107863070A (en) | 2017-12-22 | 2017-12-22 | A kind of active OLED pixel-driving circuit |
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| Publication Number | Publication Date |
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| CN107863070A true CN107863070A (en) | 2018-03-30 |
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| CN201711400864.2A Pending CN107863070A (en) | 2017-12-22 | 2017-12-22 | A kind of active OLED pixel-driving circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111429834A (en) * | 2019-01-08 | 2020-07-17 | 群创光电股份有限公司 | Electronic device and driving circuit |
| CN113380180A (en) * | 2020-02-25 | 2021-09-10 | 华为技术有限公司 | Display module and electronic equipment |
| CN115376455A (en) * | 2022-09-29 | 2022-11-22 | 惠科股份有限公司 | Pixel unit, display panel and driving method |
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| CN1811884A (en) * | 2004-12-24 | 2006-08-02 | 三星Sdi株式会社 | Organic light emitting diode display and driving method thereof |
| CN106205494A (en) * | 2016-09-09 | 2016-12-07 | 深圳市华星光电技术有限公司 | AMOLED pixel-driving circuit and image element driving method |
| WO2016192143A1 (en) * | 2015-06-03 | 2016-12-08 | 深圳市华星光电技术有限公司 | Oled pixel drive circuit and oled display panel |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1790728A (en) * | 2004-09-22 | 2006-06-21 | 三星Sdi株式会社 | Light emitting display apparatus and its driving method |
| CN1776795A (en) * | 2004-11-17 | 2006-05-24 | 三星Sdi株式会社 | Organic light emitting display and method of driving the same |
| CN1811884A (en) * | 2004-12-24 | 2006-08-02 | 三星Sdi株式会社 | Organic light emitting diode display and driving method thereof |
| WO2016192143A1 (en) * | 2015-06-03 | 2016-12-08 | 深圳市华星光电技术有限公司 | Oled pixel drive circuit and oled display panel |
| CN106205494A (en) * | 2016-09-09 | 2016-12-07 | 深圳市华星光电技术有限公司 | AMOLED pixel-driving circuit and image element driving method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111429834A (en) * | 2019-01-08 | 2020-07-17 | 群创光电股份有限公司 | Electronic device and driving circuit |
| CN111429834B (en) * | 2019-01-08 | 2021-08-20 | 群创光电股份有限公司 | Electronic device and driving circuit |
| CN113380180A (en) * | 2020-02-25 | 2021-09-10 | 华为技术有限公司 | Display module and electronic equipment |
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| CN115376455A (en) * | 2022-09-29 | 2022-11-22 | 惠科股份有限公司 | Pixel unit, display panel and driving method |
| CN115376455B (en) * | 2022-09-29 | 2023-12-22 | 惠科股份有限公司 | Pixel unit, display panel and driving method |
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Application publication date: 20180330 |
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