CN107731171A - Image element circuit and its control method, display base plate, display device - Google Patents

Image element circuit and its control method, display base plate, display device Download PDF

Info

Publication number
CN107731171A
CN107731171A CN201711228024.2A CN201711228024A CN107731171A CN 107731171 A CN107731171 A CN 107731171A CN 201711228024 A CN201711228024 A CN 201711228024A CN 107731171 A CN107731171 A CN 107731171A
Authority
CN
China
Prior art keywords
transistor
pole
compensation
signal
image element
Prior art date
Application number
CN201711228024.2A
Other languages
Chinese (zh)
Inventor
王迎
李蒙
薛伟
冯思林
李红敏
Original Assignee
合肥京东方光电科技有限公司
京东方科技集团股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 合肥京东方光电科技有限公司, 京东方科技集团股份有限公司 filed Critical 合肥京东方光电科技有限公司
Priority to CN201711228024.2A priority Critical patent/CN107731171A/en
Publication of CN107731171A publication Critical patent/CN107731171A/en

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • G09G3/3266Details of drivers for scan electrodes

Abstract

The invention discloses a kind of image element circuit, including the first transistor, second transistor, third transistor, storage capacitance and light-emitting component;The image element circuit also includes compensation control unit, and the compensation control unit connects the first pole of the first transistor and the sense wire respectively;The compensation control unit is used to access the 3rd scanning signal, and aids in completing the external compensation and internal compensation of image element circuit according to the 3rd scanning signal.The invention also discloses a kind of control method of image element circuit, display base plate and display device.Image element circuit provided by the invention and its control method, display base plate, display device, can complete external compensation, can also complete internal compensation, and display effect can be improved well by interior external compensation.

Description

Image element circuit and its control method, display base plate, display device

Technical field

The present invention relates to display technology field, particularly relates to a kind of image element circuit and its control method, display base plate, display Device.

Background technology

OLED (organic light emitting diode, Organic Light Emitting Diode) display device, is a kind of utilization Carrier injection and compound and luminous display device occur under electric field driven for luminous organic material, have self-luminous, extensively regard The advantages that angle, high-contrast, low power consumption, high reaction speed.

Show that conventional compensation method there are two kinds currently for OLED:Internal compensation and external compensation.

But the present inventor during the present invention is realized, at least there is following ask in discovery in the prior art Topic:

Internal compensation mainly realizes that Vth (threshold voltage) is compensated by adding TFT (thin film transistor (TFT)) and signal wire.Should Method advantage is that process is simple, compensation speed is fast, and shortcoming is can only to compensate Vth.

External compensation mainly carries out TFT characterisitic parameter compensation by external integrated (IC).This method advantage is picture Plain circuit is simple, compensating parameter and scope are larger, and shortcoming is that the speed of service is slow, is difficult to meet high-frequency operation condition.

The content of the invention

In view of this, the first purpose of the embodiment of the present invention is, proposes a kind of image element circuit for completing mixed compensation And its control method, display base plate, display device.

Based on above-mentioned purpose, the one side of the embodiment of the present invention, there is provided a kind of image element circuit, including first crystal Pipe, second transistor, third transistor, storage capacitance and light-emitting component;The control pole connection first of the first transistor is swept Retouch line, the first pole and the second pole of the first transistor connect the control pole and data wire of third transistor respectively, and described The control pole of two-transistor connects the second scan line, and the first pole and the second pole of the second transistor connect the described 3rd respectively Second pole of transistor and sense wire, the first pole of the third transistor connect the first power end, and the of the storage capacitance One end and the second end connect the control pole of the third transistor and the first pole of the second transistor, the luminous member respectively The first pole and the second pole of part connect the second pole and second source end of the third transistor respectively;

The image element circuit also includes compensation control unit, and the compensation control unit connects the first transistor respectively The first pole and the sense wire;The compensation control unit is used to access the 3rd scanning signal, and according to the described 3rd scanning Signal auxiliary completes the external compensation and internal compensation of image element circuit.

Optionally, the compensation control unit includes the 4th transistor, described in the control pole of the 4th transistor accesses 3rd scanning signal, the first pole and the second pole of the 4th transistor connect the first pole and the institute of the first transistor respectively State sense wire.

Optionally, described image element circuit also includes external compensation module, and the external compensation module connects described respectively Data wire and sense wire, for aiding in completing the external compensation of image element circuit.

Optionally, the external compensation module include be sequentially connected ADC units, look-up table unit, control unit, storage Unit and DAC units;

The ADC units, for gathering the analog signal on the sense wire and being converted into data signal;

The look-up table unit, for the data signal and default look-up table data to be carried out into diversity ratio pair, and draw Variance data;

Described control unit, data are compensated for being handled according to the variance data;

The memory cell, for storing the offset data;

The DAC units, for the offset data to be converted into analog compensation signal, and by the analog compensation signal Compensate in the data wire.

Optionally, described image element circuit also includes first switch and second switch;The first end of the first switch and Second end connects sense wire and the tertiary voltage end respectively, and the first end of the second switch and the second end connect described respectively Sense wire and the external compensation module.

Optionally, the light-emitting component is Organic Light Emitting Diode.

A kind of second aspect of the embodiment of the present invention, there is provided control for being applied to the image element circuit as described in preceding any one Method processed, including:

First scanning signal and the second scanning signal are high level, and the first transistor and second transistor are beaten Open, the 3rd scanning signal control compensation control unit is closed;

The low level signal that the control pole of the third transistor is accessed on data wire by the first transistor;

The sense wire is connected with external compensation module, and the magnitude of voltage of light-emitting component is output into external compensation module, is used In the external compensation for completing image element circuit;

And/or

The control method includes:

In the first period, second scanning signal and the 3rd scanning signal are high level, and first scanning signal is Low level, the sense wire access reset signal, and the second transistor and compensation control unit are opened, the first transistor Close, the control pole of the third transistor and second extremely accesses the reset signal;

In the second period, second scanning signal and the 3rd scanning signal are low level, and first scanning signal is High level, the sense wire floating, the first transistor are opened, the data wire access reference voltage signal, and the described 3rd The control pole of transistor accesses the reference voltage signal, and the second extremely reference voltage signal of the third transistor subtracts the The threshold voltage of one transistor, now the voltage between the control pole of third transistor and the second pole is the first transistor Threshold voltage;

In the 3rd period, second scanning signal and the 3rd scanning signal are low level, and first scanning signal is High level, the sense wire floating, the first transistor are opened, the data wire incoming data signal, the 3rd crystal The control pole of pipe accesses the data-signal, and the second extremely reference voltage signal of the third transistor subtracts the first transistor Threshold voltage add incremental voltage, difference of the incremental voltage between the data-signal and the reference voltage signal Value;

In the 4th period, first scanning signal, the second scanning signal and the 3rd scanning signal are low level, described Sense wire floating, the first transistor, second transistor, third transistor and compensation control unit are turned off, light-emitting component Voltage needed for luminous is stored in storage capacitance, according to the current value calculation formula that light-emitting component is flowed into luminescence process, The current value is only relevant with the data-signal and reference voltage signal, so as to complete the internal compensation of image element circuit.

3rd aspect of the embodiment of the present invention, there is provided a kind of display base plate, including the pixel as described in preceding any one Circuit.

4th aspect of the embodiment of the present invention, there is provided a kind of display device, including display base plate as previously described.

From the above it can be seen that image element circuit provided in an embodiment of the present invention and its control method, display base plate, aobvious Showing device, by setting the first transistor, second transistor, third transistor, storage capacitance and compensation control unit, the benefit Repaying control unit can aid in completing the external compensation and internal compensation of image element circuit according to the 3rd scanning signal, so that External compensation can be completed by obtaining the image element circuit, can also be completed internal compensation, can be improved well by interior external compensation aobvious Show effect.

Brief description of the drawings

Fig. 1 is the structural representation of one embodiment of image element circuit provided by the invention;

Fig. 2 is the structural representation of another embodiment of image element circuit provided by the invention;

Fig. 3 is the structural representation of another embodiment of image element circuit provided by the invention;

Fig. 4 is the schematic flow sheet of one embodiment of the control method of image element circuit provided by the invention;

Fig. 5 is that the control signal driver' s timing in one embodiment of the control method of image element circuit provided by the invention shows It is intended to;

Fig. 6 is the schematic flow sheet of another embodiment of the control method of image element circuit provided by the invention;

Fig. 7 is the control signal driver' s timing in another embodiment of the control method of image element circuit provided by the invention Schematic diagram;

Fig. 8 is the schematic flow sheet of another embodiment of the control method of image element circuit provided by the invention.

Embodiment

For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference Accompanying drawing, the present invention is described in more detail.

It should be noted that all statements for using " first " and " second " are for differentiation two in the embodiment of the present invention The non-equal entity of individual same names or non-equal parameter, it is seen that " first " " second " should not only for the convenience of statement The restriction to the embodiment of the present invention is interpreted as, subsequent embodiment no longer illustrates one by one to this.

Based on above-mentioned purpose, the first aspect of the embodiment of the present invention, there is provided a kind of pixel electricity for completing mixed compensation The one embodiment on road.As shown in figure 1, the structural representation of one embodiment for image element circuit provided by the invention.

The image element circuit, including the first transistor T1, second transistor T2, third transistor T3, storage capacitance C1 and Light-emitting component 10;Control pole connection the first scan line SCAN1 of the first transistor T1, the first of the first transistor T1 Pole and the second pole connect third transistor T3 control pole respectively and data wire DATA, the second transistor T2 control pole connect The first pole and the second pole for meeting the second scan line SCAN2, the second transistor T2 connect the third transistor T3's respectively Second pole and sense wire SENSE, the third transistor T3 the first pole connect the first power end OVDD, the storage capacitance C1 First end and the second end connect the control pole of the third transistor T3 and the first pole of the second transistor T2, institute respectively State the first pole of light-emitting component 10 and the second pole and connect the second pole and the second source end OVSS of the third transistor T3 respectively;

The image element circuit also includes compensation control unit 20, and it is brilliant that the compensation control unit 20 connects described first respectively Body pipe T1 the first pole and the sense wire SENSE;The compensation control unit 20 is used to access the 3rd scanning signal EN, and root Aid in completing the external compensation and internal compensation of image element circuit according to the 3rd scanning signal EN.

From above-described embodiment as can be seen that image element circuit provided in an embodiment of the present invention, by setting the first transistor, Two-transistor, third transistor, storage capacitance and compensation control unit, the compensation control unit can be swept according to the described 3rd External compensation and internal compensation that signal auxiliary completes image element circuit are retouched, so that the image element circuit can complete outside benefit Repay, can also complete internal compensation, display effect can be improved well by interior external compensation.

The embodiment of the present invention additionally provides another embodiment of the image element circuit.As shown in Fig. 2 provided for the present invention Image element circuit another embodiment structural representation.

The image element circuit, including the first transistor T1, second transistor T2, third transistor T3, storage capacitance C1 and Light-emitting component 10;Control pole connection the first scan line SCAN1 of the first transistor T1, the first of the first transistor T1 Pole and the second pole connect third transistor T3 control pole respectively and data wire DATA, the second transistor T2 control pole connect The first pole and the second pole for meeting the second scan line SCAN2, the second transistor T2 connect the third transistor T3's respectively Second pole and sense wire SENSE, the third transistor T3 the first pole connect the first power end OVDD, the storage capacitance C1 First end and the second end connect the control pole of the third transistor T3 and the first pole of the second transistor T2, institute respectively State the first pole of light-emitting component 10 and the second pole and connect the second pole and the second source end OVSS of the third transistor T3 respectively; Optionally, the light-emitting component 10 is Organic Light Emitting Diode OLED.

The image element circuit also includes compensation control unit 20, and it is brilliant that the compensation control unit 20 connects described first respectively Body pipe T1 the first pole and the sense wire SENSE;It is preferred that the compensation control unit 20 includes the 4th transistor T4, institute The control pole for stating the 4th transistor T4 accesses the 3rd scanning signal EN, the first pole and the second pole of the 4th transistor T4 The first pole of the first transistor T1 and the sense wire SENSE are connected respectively;The compensation control unit 20 is used to access 3rd scanning signal EN, and according to the external compensation and internal compensation of the 3rd scanning signal EN auxiliary completion image element circuits.

From above-described embodiment as can be seen that image element circuit provided in an embodiment of the present invention, by setting the first transistor, Two-transistor, third transistor, storage capacitance and the 4th transistor are to form a kind of mixed compensation pixel-driving circuit, and described Four transistors can aid in completing the external compensation and internal compensation of image element circuit according to the 3rd scanning signal, so that The image element circuit can complete external compensation, can also complete internal compensation, and display can be improved well by interior external compensation Effect.

It should be noted that when each transistor (being chosen as TFT) overall homogeneity is preferable, control sequential can also be passed through Image element circuit provided in an embodiment of the present invention is become into classical 3TIC (3 TFT and electric capacity) external compensation image element circuit.

The embodiment of the present invention additionally provides another embodiment of the image element circuit.As shown in figure 3, provided for the present invention Image element circuit another embodiment structural representation.

The image element circuit, including the first transistor T1, second transistor T2, third transistor T3, storage capacitance C1 and Light-emitting component 10;Control pole connection the first scan line SCAN1 of the first transistor T1, the first of the first transistor T1 Pole and the second pole connect third transistor T3 control pole respectively and data wire DATA, the second transistor T2 control pole connect The first pole and the second pole for meeting the second scan line SCAN2, the second transistor T2 connect the third transistor T3's respectively Second pole and sense wire SENSE, the third transistor T3 the first pole connect the first power end OVDD, the storage capacitance C1 First end and the second end connect the control pole of the third transistor T3 and the first pole of the second transistor T2, institute respectively State the first pole of light-emitting component 10 and the second pole and connect the second pole and the second source end OVSS of the third transistor T3 respectively; Wherein, first node G is formed at the control pole of the third transistor T3, the is formed at the second pole of the third transistor T3 Two node S;Optionally, the light-emitting component 10 is Organic Light Emitting Diode OLED, so that the image element circuit can answer Use in OLED display, so as to complete the internal compensation and external compensation of each pixel in OLED display;It is wherein described Equivalent capacity C2 is the equivalent capacity of the Organic Light Emitting Diode OLED;Optionally, the first power end OVDD accesses are high Level signal, the second source end OVSS access low level signal.

The image element circuit also includes compensation control unit 20, and it is brilliant that the compensation control unit 20 connects described first respectively Body pipe T1 the first pole and the sense wire SENSE;It is preferred that the compensation control unit 20 includes the 4th transistor T4, institute The control pole for stating the 4th transistor T4 accesses the 3rd scanning signal EN, the first pole and the second pole of the 4th transistor T4 The first pole of the first transistor T1 and the sense wire SENSE are connected respectively;The compensation control unit 20 is used to access 3rd scanning signal EN, and according to the external compensation and internal compensation of the 3rd scanning signal EN auxiliary completion image element circuits;

The image element circuit also includes external compensation module 30, and the external compensation module 30 connects the data wire respectively DATA and sense wire SENSE, for aiding in completing the external compensation of image element circuit.

Optionally, the external compensation module 30 include be sequentially connected ADC units 301, look-up table unit 302, control Unit 303, memory cell 304 and DAC units 305;

The ADC units 301, for gathering the analog signal on the sense wire SENSE and being converted into digital letter Number;

The look-up table unit 302, for the data signal and default look-up table data to be carried out into diversity ratio pair, and obtain Go out variance data;

Described control unit 303, data are compensated for being handled according to the variance data;

The memory cell 304, for storing the offset data;

The DAC units 305, for the offset data to be converted into analog compensation signal, and by the analog compensation Signal compensation is into the data wire DATA.

It should be noted that the circuit structure of the external compensation module 30 can have a many kinds, in the present embodiment only It is to give one of which typical circuit, those skilled in the art can be easy to be modified to other circuit structures, these The function that the circuit in function and the present embodiment achieved by modification is realized is substantially similar, therefore these modifications also should When among protection scope of the present invention.

Optionally, the image element circuit also includes first switch S1 and second switch S2;The first of the first switch S1 End and the second end connect the sense wire SENSE and tertiary voltage end Vreset respectively, the first end of the second switch S2 and Second end connects the sense wire SENSE and the external compensation module 30 respectively;So as to pass through first switch S1 and second S2 switch control is switched, controls the image element circuit to be connected with external compensation circuit or the tertiary voltage end Vreset Connect.It is preferred that the tertiary voltage end Vreset accesses is reset signal, for the first node in image element circuit G and section point S carries out current potential replacement;Optionally, the reset signal of the tertiary voltage end Vreset accesses is 0V.

From above-described embodiment as can be seen that image element circuit provided in an embodiment of the present invention, by setting the first transistor, Two-transistor, third transistor, storage capacitance and the 4th transistor are to form a kind of mixed compensation pixel-driving circuit, and described Four transistors can aid in completing the external compensation and internal compensation of image element circuit according to the 3rd scanning signal, so that The image element circuit can complete external compensation by the external compensation module, can also complete internal compensation, pass through inside and outside benefit Display effect can be improved well by repaying.

It should be noted that when each transistor (being chosen as TFT) overall homogeneity is preferable, control sequential can also be passed through Image element circuit provided in an embodiment of the present invention is become into classical 3TIC (3 TFT and electric capacity) external compensation image element circuit.

It should also be noted that, the transistor in the various embodiments described above is independently selected from polycrystalline SiTFT, non-crystalline silicon One kind in thin film transistor (TFT), oxide thin film transistor and OTFT." the control being related in the present embodiment Pole processed " can specifically refer to the grid or base stage of transistor, and " the first pole " can specifically refer to the source electrode or emitter stage of transistor, " the second pole " can specifically refer to drain electrode or the colelctor electrode of transistor accordingly.Certainly, those skilled in the art should know , being somebody's turn to do " the first pole " can be interchangeable with " the second pole ".

In addition, the first transistor T1, second transistor T2, third transistor T3, the 4th transistor T4 in above-described embodiment It is N-type transistor, is a kind of preferred scheme convenient to carry out in the present embodiment, it will not be produced to technical scheme Limitation.Those skilled in the art it should also be understood that be simply changed to the type (N-type or p-type) of each transistor, and The positive-negative polarity of each power end and control signal wire output voltage is changed, with realize with the present embodiment in each transistor The technical scheme of identical on or off operation is performed, it belongs to the application protection domain.Concrete condition, it is not another herein One illustrates.

Based on above-mentioned purpose, the second aspect of the embodiment of the present invention, there is provided a kind of pixel electricity for completing mixed compensation One embodiment of the control method on road.An as shown in figure 4, implementation of the control method for image element circuit provided by the invention The schematic flow sheet of example.

With reference to 3 and accompanying drawing 5 referring to the drawings, the control method of the image element circuit, applied to as described in preceding any embodiment Image element circuit, including:

Step 401:The first scanning signal SCAN1 and the second scanning signal SCAN2 is high level, and described first is brilliant Body pipe T1 and second transistor T2 is opened, and third transistor T3 is closed, the 3rd scanning signal EN controls compensation control Unit 20 (being the 4th transistor T4 in one embodiment) is closed;

Step 402:The control pole (first node G) of the third transistor T3 accesses number by the first transistor T1 According to the low level signal (can be 0V) on line DATA, the signal of the control pole (first node G) of the third transistor T3 is steady It is fixed constant, interference is not produced to the current potential of third transistor T3 the second pole (section point S);

Step 403:The sense wire SENSE connects with external compensation module 30, by second transistor T2 by sensing The magnitude of voltage of the light-emitting component 10 is output to external compensation module 30, for completing the external compensation of image element circuit.

Optionally, refer to the attached drawing 3, by way of closing second switch S2, disconnect first switch S1, the sense wire is made SENSE connects with external compensation module 30.Optionally, the ADC of the sense wire SENSE connections external compensation module 30 is mono- Member 301, the look-up table unit 302 will obtain signal and the look-up table data pre-set carries out diversity ratio pair, then lead to again Cross control unit 303 and memory cell 304 and DAC units 305 are modified processing to data line signal, so as to ensure to show Brightness is consistent.

So, the sensing magnitude of voltage gone by the sense wire SENSE after the acquisition degradation of light-emitting component 10, Jin Ertong Cross look-up table in external compensation module 30 and carry out contrast difference, obtain the ageing information of light-emitting component 10.In different light-emitting components On the basis of 10 ageing information, data line signal to be entered is corrected, so as to ensure that display brightness is consistent, completes the image element circuit External compensation.

The embodiment of the present invention additionally provides a kind of another reality of the control method for the image element circuit for completing mixed compensation Apply example.As shown in fig. 6, the schematic flow sheet of another embodiment for the control method of image element circuit provided by the invention.

With reference to 3 and accompanying drawing 7 referring to the drawings, the control method of the image element circuit, applied to as described in preceding any embodiment Image element circuit, the control method includes:

Step 501:In the first period t1, reset phase or reseting stage, second scanning signal also are understood as SCAN2 and the 3rd scanning signal EN is high level, and the first scanning signal SCAN1 is low level, and the sense wire SENSE connects Enter reset signal Vreset (can be by closing first switch S1, disconnecting second switch S2 to realize), the second transistor T2 (optional, the 4th transistor T4 is opened) is opened with compensation control unit 20, the first transistor T1 is closed, and the described 3rd is brilliant Body pipe T3 control pole and second extremely accesses the reset signal Vreset, and the reset signal Vreset is that low level (can To be 0V), i.e. first node G and section point S are set low the confidence Vreset that attaches most importance to;As can be seen that pass through the second crystal Pipe T2 and compensation control unit 20 design, it is ensured that this period G point is consistent with S point current potentials, is easy to compensation calculation.

Step 502:In the second period t2, compensated stage also is understood as, the second scanning signal SCAN2 and the 3rd is swept It is low level to retouch signal EN, and the first scanning signal SCAN1 is high level, and the sense wire SENSE floatings (can pass through disconnection First switch S1 and second switch S2 is realized), the first transistor T1 is opened, and the data wire DATA accesses reference voltage Signal (i.e. Vdata=Vref), the control pole of the third transistor T3 access reference voltage signal Vref (the i.e. first segments Point G current potential VG=Vref), the second extremely reference voltage signal of the third transistor T3 subtracts the first transistor T1 threshold The current potential VS=Vref-Vth_T1 of threshold voltage, i.e. section point S, now between third transistor T3 control pole and the second pole Voltage be the first transistor T1 threshold voltage vt h_T1, i.e. VGS=VG-VS=Vth_T1.

Step 503:In the 3rd period t3, data write phase, the second scanning signal SCAN2 and also are understood as Three scanning signal EN are low level, and the first scanning signal SCAN1 is high level, and the sense wire SENSE floatings (can pass through First switch S1 and second switch S2 is disconnected to realize), the first transistor T1 is opened, and the data wire DATA accesses data Described in signal Vdata ' (gray scale voltage value to be written), i.e. Vdata=Vdata ', the third transistor T3 control pole access Data-signal Vdata ', i.e. VG=Vdata ', the second extremely reference voltage signal of the third transistor T3 subtract the first crystalline substance Body pipe T1 threshold voltage vt h_T1 adds incremental voltage △ V, i.e. VS=Vref-Vth_T1+ △ V, the incremental voltage △ V For the difference between the data-signal Vdata ' and the reference voltage signal Vref.

It should be noted that:Incremental voltage △ V be as VG=Vdata ', for make third transistor T3 open it is more abundant, So as to the current potential of lifting section point S points, its calculation formula is:

So

Wherein, C1 is storage capacitance, and C2 is the equivalent capacity of light-emitting component 10.

Step 504:In the 4th period t4, glow phase also is understood as, the first scanning signal SCAN1, second are swept It is low level to retouch signal SCAN2 and the 3rd scanning signal EN, and the sense wire SENSE floatings (can be by disconnecting first switch S1 and second switch S2 is realized), the first transistor T1, second transistor T2, third transistor T3 and compensation control are single Member 20 is turned off, and the luminous required voltage of light-emitting component 10 is stored in storage capacitance C1, is sent out according to being flowed into luminescence process The current value calculation formula of optical element 10, the current value only have with the data-signal Vdata ' and reference voltage signal Vref Close, so as to complete the internal compensation of image element circuit.

Specifically:The calculation formula that the current value of light-emitting component 10 is flowed into luminescence process is as follows:

I=1/2Coxu (w/l) (VGS-Vth)2

Due to,

So

From modification processing after glow phase flow into light-emitting component 10 current value formula I=1/2K (Vdata '- Vref)2, it can be seen that I values size is only relevant with Vdata '-Vref, so as to effective compensation Vth_T1.

It should be noted that as oxide TFT technological levels are improved, when oxide TFT entirety homogeneity is preferable, also may be used Using by controlling the 3rd scanning signal EN sequential that the image element circuit in the embodiment of the present invention is become into classics as low level 3TIC external compensation image element circuits.

The embodiment of the present invention additionally provides a kind of another reality of the control method for the image element circuit for completing mixed compensation Apply example.As shown in figure 8, the schematic flow sheet of another embodiment for the control method of image element circuit provided by the invention.

The control method of the image element circuit, including the external compensation step first carried out, and the internal compensation carried out afterwards Step, specifically include:

Step 60:External compensation, specifically include:

Step 601:First scanning signal and the second scanning signal are high level, the first transistor and second Transistor is opened, and the 3rd scanning signal control compensation control unit is closed;

Step 602:The low level that the control pole of the third transistor is accessed on data wire by the first transistor Signal;

Step 603:The sense wire is connected with external compensation module, and the magnitude of voltage of light-emitting component is output into external compensation Module, for completing the external compensation of image element circuit;

Step 70:Internal compensation, specifically include:

Step 701:In the first period, second scanning signal and the 3rd scanning signal are high level, and described first sweeps It is low level to retouch signal, and the sense wire accesses reset signal, and the second transistor and compensation control unit are opened, described the One transistor is closed, and the control pole of the third transistor and second extremely accesses the reset signal;

Step 702:In the second period, second scanning signal and the 3rd scanning signal are low level, and described first sweeps It is high level to retouch signal, the sense wire floating, and the first transistor is opened, and the data wire accesses reference voltage signal, The control pole of the third transistor accesses the reference voltage signal, and the second extremely reference voltage of the third transistor is believed The threshold voltage of the first transistor number is subtracted, now the voltage between the control pole of third transistor and the second pole is described first The threshold voltage of transistor;

Step 703:In the 3rd period, second scanning signal and the 3rd scanning signal are low level, and described first sweeps It is high level to retouch signal, the sense wire floating, and the first transistor is opened, and the data wire incoming data signal is described The control pole of third transistor accesses the data-signal, and the second extremely reference voltage signal of the third transistor subtracts the The threshold voltage of one transistor adds incremental voltage, and the incremental voltage is the data-signal and the reference voltage signal Between difference;

Step 704:In the 4th period, first scanning signal, the second scanning signal and the 3rd scanning signal are low Level, the sense wire floating, the first transistor, second transistor, third transistor and compensation control unit are turned off, Voltage needed for light-emitting component is luminous is stored in storage capacitance, according to the current value meter that light-emitting component is flowed into luminescence process Formula is calculated, the current value is only relevant with the data-signal and reference voltage signal, is mended so as to complete the inside of image element circuit Repay.

From the above it can be seen that the control method of image element circuit provided in an embodiment of the present invention, by being equipped with There are the first transistor, second transistor, third transistor, storage capacitance and the image element circuit for compensating control unit, the compensation Control unit can aid in completing the external compensation and internal compensation of image element circuit according to the 3rd scanning signal, so that The control method of the image element circuit can complete external compensation, can also complete internal compensation, can be fine by interior external compensation Improve display effect in ground.

Although it should be noted that defining internal compensation and the order of external compensation in the present embodiment, do not represent The external compensation of internal compensation must be carried out in this order, and in some situations, the progress order of the two is probably opposite 's.Also, internal compensation and external compensation may be carried out respectively in the different pixel compensation cycles, it is also possible in same pixel Carried out successively in compensation cycle, this is all the reasonable selection of those skilled in the art, does not apply any implementation to limit Determine protection scope of the present invention.

Based on above-mentioned purpose, the third aspect of the embodiment of the present invention, there is provided a kind of display base for completing mixed compensation One embodiment of plate.

The display base plate, including the image element circuit as described in preceding any embodiment.

From the above it can be seen that display base plate provided in an embodiment of the present invention, by setting in image element circuit One transistor, second transistor, third transistor, storage capacitance and compensation control unit, the compensation control unit being capable of root Aid in completing the external compensation and internal compensation of image element circuit according to the 3rd scanning signal, so that the display base plate was both External compensation can be completed, can also complete internal compensation, display effect can be improved well by interior external compensation.

It is preferred that the display base plate is OLED (Organic Light Emitting Diode) display base plate so that in the display base plate The image element circuit internal compensation and external compensation can be better achieved.

Based on above-mentioned purpose, the fourth aspect of the embodiment of the present invention, there is provided a kind of display dress for completing mixed compensation The one embodiment put.

The display device, including display base plate as previously described.

It should be noted that the display device in the present embodiment can be:Electronic Paper, mobile phone, tablet personal computer, television set, Any product or part with display function such as notebook computer, DPF, navigator.

From the above it can be seen that display device provided in an embodiment of the present invention, by setting in image element circuit One transistor, second transistor, third transistor, storage capacitance and compensation control unit, the compensation control unit being capable of root Aid in completing the external compensation and internal compensation of image element circuit according to the 3rd scanning signal, so that the display device was both External compensation can be completed, can also complete internal compensation, display effect can be improved well by interior external compensation.

It is preferred that the display device is OLED (Organic Light Emitting Diode) display device so that in the display device The image element circuit internal compensation and external compensation can be better achieved.

In the present invention, term " first ", " second ", " the 3rd ", " the 4th " are only used for describing purpose, and it is not intended that Instruction implies relative importance.Term " multiple " refers to two or more, is limited unless otherwise clear and definite.

The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies Change, equivalent substitution, improvement etc., should be included in the scope of the protection.

Claims (9)

1. a kind of image element circuit, including the first transistor, second transistor, third transistor, storage capacitance and light-emitting component;Institute The control pole for stating the first transistor connects the first scan line, and the first pole and the second pole of the first transistor connect the 3rd respectively The control pole and data wire of transistor, the control pole of the second transistor connect the second scan line, the second transistor First pole and the second pole connect the second pole and the sense wire of the third transistor respectively, and the first pole of the third transistor connects Connect the first power end, the first end of the storage capacitance and the second end connect the control pole of the third transistor and described respectively First pole of second transistor, the first pole and the second pole of the light-emitting component connect the second pole of the third transistor respectively With second source end;
Characterized in that, the image element circuit also includes compensation control unit, the compensation control unit connects described the respectively First pole of one transistor and the sense wire;The compensation control unit is used to access the 3rd scanning signal, and according to described 3rd scanning signal auxiliary completes the external compensation and internal compensation of image element circuit.
2. image element circuit according to claim 1, it is characterised in that the compensation control unit includes the 4th transistor, The control pole of 4th transistor accesses the 3rd scanning signal, the first pole of the 4th transistor and the second pole difference Connect the first pole of the first transistor and the sense wire.
3. image element circuit according to claim 1, it is characterised in that also including external compensation module, the external compensation Module connects the data wire and sense wire respectively, for aiding in completing the external compensation of image element circuit.
4. image element circuit according to claim 3, it is characterised in that the external compensation module includes what is be sequentially connected ADC units, look-up table unit, control unit, memory cell and DAC units;
The ADC units, for gathering the analog signal on the sense wire and being converted into data signal;
The look-up table unit, for the data signal and default look-up table data to be carried out into diversity ratio pair, and draw difference Data;
Described control unit, data are compensated for being handled according to the variance data;
The memory cell, for storing the offset data;
The DAC units, for the offset data to be converted into analog compensation signal, and by the analog compensation signal compensation Into the data wire.
5. image element circuit according to claim 3, it is characterised in that also including first switch and second switch;Described The first end of one switch and the second end connect sense wire and the tertiary voltage end respectively, the first end of the second switch and the Two ends connect the sense wire and the external compensation module respectively.
6. image element circuit according to claim 1, it is characterised in that the light-emitting component is Organic Light Emitting Diode.
A kind of 7. control method for being applied to the image element circuit as described in claim any one of 1-6, it is characterised in that the control Method processed includes:
First scanning signal and the second scanning signal are high level, and the first transistor and second transistor are opened, The 3rd scanning signal control compensation control unit is closed;
The low level signal that the control pole of the third transistor is accessed on data wire by the first transistor;
The sense wire connects with external compensation module, the magnitude of voltage of light-emitting component is output into external compensation module, for complete The external compensation of pixel circuit;
And/or
The control method includes:
In the first period, second scanning signal and the 3rd scanning signal are high level, and first scanning signal is low electricity Flat, the sense wire accesses reset signal, and the second transistor and compensation control unit are opened, and the first transistor closes Close, the control pole of the third transistor and second extremely accesses the reset signal;
In the second period, second scanning signal and the 3rd scanning signal are low level, and first scanning signal is high electricity Flat, the sense wire floating, the first transistor is opened, and the data wire accesses reference voltage signal, the 3rd crystal The control pole of pipe accesses the reference voltage signal, and the second extremely reference voltage signal of the third transistor subtracts the first crystalline substance The threshold voltage of body pipe, now the voltage between the control pole of third transistor and the second pole is the threshold value of the first transistor Voltage;
In the 3rd period, second scanning signal and the 3rd scanning signal are low level, and first scanning signal is high electricity Flat, the sense wire floating, the first transistor is opened, the data wire incoming data signal, the third transistor Control pole accesses the data-signal, and the second extremely reference voltage signal of the third transistor subtracts the threshold of the first transistor Threshold voltage adds incremental voltage, difference of the incremental voltage between the data-signal and the reference voltage signal;
In the 4th period, first scanning signal, the second scanning signal and the 3rd scanning signal are low level, the sensing Line floating, the first transistor, second transistor, third transistor and compensation control unit are turned off, and light-emitting component lights Required voltage is stored in storage capacitance, described according to the current value calculation formula that light-emitting component is flowed into luminescence process Current value is only relevant with the data-signal and reference voltage signal, so as to complete the internal compensation of image element circuit.
8. a kind of display base plate, it is characterised in that including the image element circuit as described in claim any one of 1-6.
9. a kind of display device, it is characterised in that including display base plate as claimed in claim 8.
CN201711228024.2A 2017-11-29 2017-11-29 Image element circuit and its control method, display base plate, display device CN107731171A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711228024.2A CN107731171A (en) 2017-11-29 2017-11-29 Image element circuit and its control method, display base plate, display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711228024.2A CN107731171A (en) 2017-11-29 2017-11-29 Image element circuit and its control method, display base plate, display device

Publications (1)

Publication Number Publication Date
CN107731171A true CN107731171A (en) 2018-02-23

Family

ID=61220168

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711228024.2A CN107731171A (en) 2017-11-29 2017-11-29 Image element circuit and its control method, display base plate, display device

Country Status (1)

Country Link
CN (1) CN107731171A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108492779A (en) * 2018-03-15 2018-09-04 业成科技(成都)有限公司 The organic light emitting diode pixel circuit and its driving method of integrating exterior processor
CN108564922A (en) * 2018-03-28 2018-09-21 昆山国显光电有限公司 Pixel-driving circuit and display screen
CN108806609A (en) * 2018-06-15 2018-11-13 京东方科技集团股份有限公司 A kind of data processing method and its device, medium
CN109545145A (en) * 2019-01-02 2019-03-29 京东方科技集团股份有限公司 Pixel circuit and its driving method, display device
WO2019184391A1 (en) * 2018-03-26 2019-10-03 京东方科技集团股份有限公司 Pixel circuit and driving method therefor, and display panel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105427805A (en) * 2016-01-04 2016-03-23 京东方科技集团股份有限公司 Pixel driving circuit and method, display panel, and display apparatus
CN106328061A (en) * 2016-10-14 2017-01-11 深圳市华星光电技术有限公司 OLED pixel mixing and compensating circuit and method
CN106504707A (en) * 2016-10-14 2017-03-15 深圳市华星光电技术有限公司 OLED pixel mixed compensation circuit and mixed compensation method
CN107025884A (en) * 2017-05-04 2017-08-08 京东方科技集团股份有限公司 OLED pixel compensation method, compensation device and display device
CN107134258A (en) * 2017-06-26 2017-09-05 京东方科技集团股份有限公司 OLED compensation circuit and preparation method thereof, OLED compensation device and display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105427805A (en) * 2016-01-04 2016-03-23 京东方科技集团股份有限公司 Pixel driving circuit and method, display panel, and display apparatus
CN106328061A (en) * 2016-10-14 2017-01-11 深圳市华星光电技术有限公司 OLED pixel mixing and compensating circuit and method
CN106504707A (en) * 2016-10-14 2017-03-15 深圳市华星光电技术有限公司 OLED pixel mixed compensation circuit and mixed compensation method
CN107025884A (en) * 2017-05-04 2017-08-08 京东方科技集团股份有限公司 OLED pixel compensation method, compensation device and display device
CN107134258A (en) * 2017-06-26 2017-09-05 京东方科技集团股份有限公司 OLED compensation circuit and preparation method thereof, OLED compensation device and display device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108492779A (en) * 2018-03-15 2018-09-04 业成科技(成都)有限公司 The organic light emitting diode pixel circuit and its driving method of integrating exterior processor
WO2019184391A1 (en) * 2018-03-26 2019-10-03 京东方科技集团股份有限公司 Pixel circuit and driving method therefor, and display panel
CN108564922A (en) * 2018-03-28 2018-09-21 昆山国显光电有限公司 Pixel-driving circuit and display screen
CN108806609A (en) * 2018-06-15 2018-11-13 京东方科技集团股份有限公司 A kind of data processing method and its device, medium
CN109545145A (en) * 2019-01-02 2019-03-29 京东方科技集团股份有限公司 Pixel circuit and its driving method, display device

Similar Documents

Publication Publication Date Title
CN104050917B (en) A kind of image element circuit, organic EL display panel and display device
CN101251975B (en) Display apparatus and drive method therefor, and electronic equipment
CN101151647A (en) A voltage programmed pixel circuit, display system and driving method thereof
CN101546520A (en) Organic light-emitting diode display and drive method therefor
CN104252844B (en) Image element circuit and its driving method, organic electroluminescence display panel and display device
TW200903417A (en) Display apparatus, method of driving a display, and electronic device
CN102982767A (en) Pixel unit driving circuit, driving method and display device
US9105234B2 (en) Array substrate row driving unit, array substrate row driving circuit and display device
WO2016187990A1 (en) Pixel circuit and drive method for pixel circuit
CN103700342B (en) OLED pixel circuit and driving method, display device
CN101192373B (en) Organic light emitting display and voltage compensation technology organic light emitting pixel
CN104134426B (en) Pixel structure and driving method thereof, and display device
CN105427803B (en) Pixel-driving circuit, method, display panel and display device
CN102819996B (en) Image element circuit, display device, electronic installation and pixel circuit drive method
CN103971640B (en) A kind of pixel-driving circuit and driving method thereof and display device
CN106097964B (en) Pixel circuit, display panel, display equipment and driving method
CN102651194A (en) Voltage driving pixel circuit, driving method thereof and display panel
US10102798B2 (en) Detection circuit, detection method and drive system
CN103021333B (en) The image element circuit of organic light emitting display and driving method thereof
US8976090B2 (en) Pixel circuit with multiple holding capacitors, method of driving the pixel circuit, display panel, display device and electronic unit
WO2015062298A1 (en) Oled pixel circuit and driving method thereof, and display device
CN104409047B (en) Pixel driving circuit, pixel driving method and display device
CN104850270A (en) Driving method and driving circuit of touch control module set, touch control module set, panel and device
CN104217677B (en) touch display circuit and display device
CN105206221B (en) Pixel-driving circuit, driving method, array substrate and display device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination