CN203825990U - Pixel circuit and display apparatus - Google Patents
Pixel circuit and display apparatus Download PDFInfo
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- CN203825990U CN203825990U CN201420264821.1U CN201420264821U CN203825990U CN 203825990 U CN203825990 U CN 203825990U CN 201420264821 U CN201420264821 U CN 201420264821U CN 203825990 U CN203825990 U CN 203825990U
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Abstract
The utility model discloses a pixel circuit and a display apparatus. In the pixel circuit provided in an embodiment of the utility model, when a driving module provides a driving voltage for a luminescent device, a sampling module carries out sampling on the driving voltage; a processing module carries out processing according to the driving voltage sampled by the sampling module. According to a corresponding relation of luminescent device illumination brightness stored in advance and the driving voltage along with changes of usage time, a compensation voltage corresponding to the driving voltage is acquired. A compensation module inputs the compensation voltage determined by the processing module into the corresponding luminescent device so that a function that different compensations are performed on the driving voltage of the luminescent device according to different usage time of the luminescent device is realized. When the luminescent device uses the same driving voltage to drive the luminescent device along with increase of usage time, the brightness of the luminescent device is reduced and display brightness of a display panel is nonuniform. By using the pixel circuit, the above problems are avoided and uniformity of the display brightness of the display panel is increased.
Description
Technical field
The utility model relates to display technique field, relates in particular to a kind of image element circuit and display device.
Background technology
At present, in existing organic elctroluminescent device (OLED, Organic Light Emitting Diode), luminosity and the drive current of OLED device are directly proportional, and and driving voltage exponent function relation; Under the state showing in low gray scale, the driving voltage of OLED device is very obvious to the variable effect of its luminosity.The electric property of OLED device is decay to some extent along with the increase of service time, OLED device in use its voltage drop meeting increases to some extent, along with the growth of service time, while adopting identical driving voltage driving OLED device, the brightness meeting of OLED device reduces, make display brightness inhomogeneous, thereby affect the display effect of whole image.And OLED device belongs to current drives, need stable electric current to control luminous, due to the reason such as manufacturing process and device aging, can make the threshold voltage V of the driving transistors of image element circuit
ththere is unevenness, change and make display brightness inhomogeneous with regard to having caused flowing through the electric current of each pixel OLED like this, also can affect the display effect of whole image.
Therefore, in the time carrying out pixel circuit design, generally can introduce corresponding internal compensation technology, there is the image element circuit of internal compensation function, as shown in Figure 1, comprising: driving transistors T1, switching transistor T2, input control circuit module, capacitor C and OLED device; In the time that image element circuit is worked, adopt this internal compensation circuit, can make to drive the luminous driving voltage of luminescent device only relevant with the voltage data signal of data-signal end place input, irrelevant with the threshold voltage of driving transistors, can avoid the impact of threshold voltage on luminescent device, still, can not eliminate in use its voltage drop meeting of OLED device increases to some extent, make display brightness inhomogeneous, affect the problem of the display effect of whole image.
Therefore, decay along with the growth of the service time problem of display effect of the whole image of impact that brings of electric property how to alleviate OLED device, is the problem that those skilled in the art need solution badly.
Utility model content
The utility model embodiment provides a kind of image element circuit and display device, in order to solve luminescent device along with the growth brightness of service time reduces the inhomogeneous problem of display panel display brightness of bringing.
The utility model embodiment provides a kind of image element circuit, comprises luminescent device and is used to described luminescent device that the driver module of driving voltage is provided, and also comprises: sampling module, compensating module and processing module; Wherein,
The input end of described sampling module is connected with the output terminal of described driver module, and described sampling module is sampled for the driving voltage that described driver module is provided;
The input end of described processing module is connected with the output terminal of described sampling module, the driving voltage of described processing module for sampling according to described sampling module, and the luminosity of pre-stored described luminescent device is along with the variation of service time and the corresponding relation of driving voltage, determines the bucking voltage corresponding with described driving voltage;
The input end of described compensating module is connected with the output terminal of described processing module, and described compensating module is input to described luminescent device for the bucking voltage that described processing module is determined.
In the above-mentioned image element circuit that the utility model embodiment provides, in the time that driver module provides driving voltage for luminescent device, sampling module is sampled to this driving voltage, the driving voltage that processing module samples according to sampling module is processed, and the luminosity of pre-stored luminescent device is along with the variation of service time and the corresponding relation of driving voltage, obtain the bucking voltage corresponding with this driving voltage, the bucking voltage that compensating module is determined processing module is input to corresponding luminescent device, realize according to the difference of luminescent device service time the driving voltage of luminescent device has been carried out to different compensate functions, avoid the brightness meeting of the luminescent device occurring while driving luminescent device due to the luminescent device driving voltage identical along with the growth of service time adopts to reduce, and the inhomogeneous problem of the display brightness of the display panel causing, improve the homogeneity of display panel display brightness.
In a kind of possible embodiment, in the above-mentioned image element circuit that the utility model embodiment provides, described sampling module comprises: the first film transistor and the second thin film transistor (TFT); Wherein,
The transistorized grid of described the first film and sampled signal control end are electrical connected, and described sampled signal control end is for controlling described sampling module in conducting state in sampling time section;
The transistorized drain electrode of described the first film is electrical connected with the source electrode of described the second thin film transistor (TFT) and the output terminal of described driver module respectively;
The grid of the transistorized source electrode of described the first film and described the second thin film transistor (TFT) is electrical connected;
The drain electrode of described the second thin film transistor (TFT) and the input end of described processing module are electrical connected.
In a kind of possible embodiment, in the above-mentioned image element circuit that the utility model embodiment provides, described compensating module comprises: the 3rd thin film transistor (TFT) and the 4th thin film transistor (TFT): wherein,
The grid of described the 3rd thin film transistor (TFT) and compensation signal control end are electrical connected, and described compensation signal control end is for controlling described compensating module in conducting state in make-up time section;
The drain electrode of described the 3rd thin film transistor (TFT) is electrical connected with described the 4th source electrode of thin film transistor (TFT) and the output terminal of described processing module respectively;
The grid of described the 3rd thin film transistor (TFT) source electrode and described the 4th thin film transistor (TFT) is electrical connected;
The drain electrode of described the 4th thin film transistor (TFT) and described luminescent device input end are electrical connected.
In a kind of possible embodiment, in the above-mentioned image element circuit that the utility model embodiment provides, the input end of described processing module and output terminal are same port; Described sampled signal control end or described compensation signal control end timesharing drive corresponding described sampling module or compensating module in conducting state.
In a kind of possible embodiment, in the above-mentioned image element circuit that the utility model embodiment provides, also comprise: be connected between the output terminal of described sampling module and the input end of described processing module, and be connected in the cache module between the input end of described compensating module and the output terminal of described processing module; Described cache module is for drive voltage signal or the definite compensation voltage signal of described processing module of sampling module sampling described in buffer memory.
In a kind of possible embodiment, in the above-mentioned image element circuit that the utility model embodiment provides, described cache module comprises electric capacity, one end ground connection of described electric capacity, the other end is connected between the output terminal of described sampling module and the input end of described processing module, and is connected between the input end of described compensating module and the output terminal of described processing module.
In a kind of possible embodiment, in the above-mentioned image element circuit that the utility model embodiment provides, described processing module comprises:
AD conversion unit, converts corresponding digital signal to for the simulating signal of driving voltage that described sampling module is sampled;
Storage unit, for the luminosity of storing in advance the described luminescent device of setting up along with the variation of service time and the corresponding relation of driving voltage;
Determining unit, for the digital signal after changing according to described AD conversion unit, and the luminosity of pre-stored described luminescent device is along with the variation of service time and the corresponding relation of driving voltage, determines the digital signal of the bucking voltage corresponding with described driving voltage;
D/A conversion unit, for simulating signal corresponding to the digital signal of bucking voltage definite described determining unit converting to.
The utility model embodiment provides a kind of display device, comprises above-mentioned any one image element circuit that the utility model embodiment provides.
Utility model utility model
Brief description of the drawings
Fig. 1 is the structural representation of the image element circuit of available technology adopting internal compensation;
The structural representation of the image element circuit that Fig. 2 provides for the utility model embodiment;
The concrete structure schematic diagram of the image element circuit that Fig. 3 provides for the utility model embodiment;
Sampled signal control end in the image element circuit that Fig. 4 provides for the utility model embodiment and the working timing figure of compensation signal control end;
The structural representation of the analog to digital conversion circuit that Fig. 5 provides for the utility model embodiment;
The structural representation of the D/A converting circuit that Fig. 6 provides for the utility model embodiment;
The luminosity of luminescent device and the corresponding relation curve of driving voltage that Fig. 7 provides for the utility model embodiment;
The process flow diagram of the driving method of the image element circuit that Fig. 8 provides for the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, the image element circuit that the utility model embodiment is provided and the embodiment of display device are described in detail.
A kind of image element circuit that the utility model embodiment provides, as shown in Figure 2, comprises luminescent device 01 and is used to luminescent device that the driver module 02 of driving voltage is provided, and also comprises: sampling module 03, compensating module 04 and processing module 05; Wherein,
The input end of sampling module 03 is connected with the output terminal of driver module 02, and sampling module 03 is sampled for the driving voltage that driver module 02 is provided;
The input end of processing module 05 is connected with the output terminal of sampling module 03, the driving voltage of processing module 05 for sampling according to sampling module 03, and the pre-stored luminosity of luminescent device 01 and the corresponding relation of driving voltage, determine the bucking voltage corresponding with driving voltage;
The input end of compensating module 04 is connected with the output terminal of processing module 05, and compensating module 04 is input to luminescent device for the bucking voltage that processing module 05 is determined.
In the specific implementation, in the above-mentioned image element circuit that the utility model embodiment provides, driver module 02 provides driving voltage for luminescent device 01, in the time that driver module 02 is inputted driving voltage to luminescent device 01, sampling module 03 is sampled to driving voltage, and the driving voltage of sampling is outputed to processing module 05; Processing module 05 is processed sampled voltage, determines the bucking voltage corresponding with driving voltage, and bucking voltage is outputed to compensating module 04; Bucking voltage definite processing module 05 is input to luminescent device 01 by compensating module 04.
In the above-mentioned image element circuit that the utility model embodiment provides, in the time that driver module 02 provides driving voltage for luminescent device 01, sampling module 03 is sampled to this driving voltage, the driving voltage that processing module 05 samples according to sampling module 03 is processed, and the luminosity of pre-stored luminescent device 01 is along with the variation of service time and the corresponding relation of driving voltage, obtain the bucking voltage corresponding with this driving voltage, the bucking voltage that compensating module 04 is determined processing module 05 is input to corresponding luminescent device 01, realize according to the difference of 01 service time of luminescent device the driving voltage of luminescent device 01 has been carried out to different compensate functions, avoid the brightness meeting of the luminescent device occurring while driving luminescent device 01 due to luminescent device 01 driving voltage identical along with the growth of service time adopts to reduce, and the inhomogeneous problem of the display brightness of the display panel causing, improve the homogeneity of display panel display brightness.
Further, in the above-mentioned image element circuit that the utility model embodiment provides, as shown in Figure 3, driver module 02 can be identical with prior art, adopt internal compensation circuit, specifically comprise: input control module, capacitor C st, driving transistors DTFT, switching transistor STFT.In the time that image element circuit is worked, driver module 02 is the driving voltage after luminescent device 01 affords redress by node N1 with compensating module 04 jointly; Wherein, the drive current that is input to luminescent device 01 is:
Wherein, V
mendthe bucking voltage of exporting for compensating module 04.Like this, by the course of work of above-mentioned image element circuit, realize the driving voltage of luminescent device 01 has been compensated, avoid the brightness occurring while driving luminescent device 01 due to luminescent device 01 driving voltage identical along with the growth of service time adopts to reduce, and the inhomogeneous problem of the display brightness of the display panel causing has improved the homogeneity of display panel display brightness.
Particularly, the driving transistors DTFT that driver module 02 has can adopt P transistor npn npn, also can adopt N-type transistor, does not limit at this.
Particularly, above-mentioned luminescent device 01 generally refers to Organic Light Emitting Diode (OLED), can certainly be other electroluminescent devices, does not limit at this.
Further, the above-mentioned image element circuit that the utility model embodiment provides, in the specific implementation, the sampling module 03 in above-mentioned image element circuit, as shown in Figure 3, can specifically comprise: the first film transistor T 1 and the second thin film transistor (TFT) T2; Wherein,
The grid of the first film transistor T 1 and sampled signal control end SW1 are electrical connected, and sampled signal control end SW1 is used at sampling time section control sampling module 03 in conducting state;
The drain electrode of the first film transistor T 1 is electrical connected with the source electrode of the second thin film transistor (TFT) T2 and the output terminal of driver module 02 respectively;
The grid of the source electrode of the first film transistor T 1 and the second thin film transistor (TFT) T2 is electrical connected;
The input end of the drain electrode of the second thin film transistor (TFT) T2 and processing module 05 is electrical connected.
In the specific implementation, in the above-mentioned image element circuit that the utility model embodiment provides, the first film transistor T 1 of sampling module 03 and the second thin film transistor (TFT) T2 can be N-type transistor or P transistor npn npn simultaneously, do not limit at this.The following stated is all taking the first film transistor T 1 and the second thin film transistor (TFT) T2 as P transistor npn npn is as example, the above-mentioned sampling module 03 that the utility model embodiment provides is in the time that sampled signal control end SW1 receives low level signal, the first film transistor T 1 and the second thin film transistor (TFT) T2 are in conducting state, form the one way signal path of an output terminal from driver module 02 to the input end of processing module 05, the driving voltage of under the control of sampled signal control end SW1, driver module 02 being exported is sampled.And, known according to the annexation of above-mentioned the first film transistor T 1 and the second thin film transistor (TFT) T2, the input end one-way conduction that the transmission direction of signal only can be from the output terminal of driver module 02 to processing module 05 in sampling module 03, oppositely cut-off.
Further, the above-mentioned image element circuit that the utility model embodiment provides, in the specific implementation, the compensating module 04 of above-mentioned image element circuit, as shown in Figure 3, can specifically comprise: the 3rd thin film transistor (TFT) T3 and the 4th thin film transistor (TFT) T4; Wherein,
The grid of the 3rd thin film transistor (TFT) T3 and compensation signal control end SW2 are electrical connected, and compensation signal control end SW2 is used in make-up time section control and compensation module 04 in conducting state;
The drain electrode of the 3rd thin film transistor (TFT) T3 is electrical connected with the source electrode of the 4th thin film transistor (TFT) T4 and the output terminal of processing module 05 respectively;
The grid of the source electrode of the 3rd thin film transistor (TFT) T3 and the 4th thin film transistor (TFT) T4 is electrical connected;
The drain electrode of the 4th thin film transistor (TFT) T4 and luminescent device input end are electrical connected.
In the specific implementation, in the above-mentioned image element circuit that the utility model embodiment provides, the 3rd thin film transistor (TFT) T3 of compensating module 04 and the 4th thin film transistor (TFT) T4 can be N-type transistor or P transistor npn npn simultaneously, do not limit at this.The following stated is all taking the 3rd thin film transistor (TFT) T3 and the 4th thin film transistor (TFT) T4 as P transistor npn npn is as example, the above-mentioned compensating module 04 that the utility model embodiment provides is in the time that compensation signal control end SW2 receives low level signal, the 3rd thin film transistor (TFT) T3 and the 4th thin film transistor (TFT) T4 are in conducting state, form the one way signal path of an output terminal from processing module 05 to the input end of luminescent device 01, the bucking voltage of under the control of compensation signal control end SW2, processing module 05 being exported is input to the input end of luminescent device 01.And, known according to the annexation of above-mentioned the 3rd thin film transistor (TFT) T3 and the 4th thin film transistor (TFT) T4, the input end one-way conduction that the transmission direction of signal only can be from the output terminal of processing module 05 to luminescent device 01 in compensating module 04, oppositely cut-off.
Further, in the specific implementation, in the above-mentioned image element circuit providing at the utility model embodiment, generally sampling module 03 and compensating module 04 and driver module 02 and luminescent device 01 are all arranged on to the viewing area of display panel, processing module 05 is arranged on non-display area, for the signal of sampling and compensation is transferred to non-display area, extension line need to be set respectively, in order to save the quantity of wiring, input end and output terminal that can also processing module 05 be set to same port, it is the port that the output terminal of sampling module 03 and the input end of compensating module 04 are connected in processing module 05 jointly.On the basis of this annexation, for fear of phase mutual interference between sampling module 03 and compensating module 04, only allow one of them module in running order at synchronization, therefore, need sampled signal control end SW1 or compensation signal control end SW2 timesharing to drive corresponding sampling module 03 or compensating module 04 in conducting state, the work schedule of sampled signal control end SW1 and compensation signal control end SW2, as shown in Figure 4.Like this, ensure the one-way of signal flow, made sampling process and compensation process not be subject to the interference of outer signals.
In the specific implementation, the above-mentioned image element circuit that the utility model embodiment provides can also comprise and being connected between the output terminal of sampling module 03 and the input end of processing module 05, and be connected in the cache module 06 between the input end of compensating module 04 and the output terminal of processing module 05, as shown in Figure 3, cache module 06 can buffer memory sampling module 03 be sampled drive voltage signal or the definite compensation voltage signal of processing module 05.Like this, adopt cache module 06 to carry out buffer memory to sampled voltage signal or compensation voltage signal, can carry out on the one hand the signal conversion of electric current to voltage, coordinate on the one hand the work schedule of corresponding sampled signal control end SW1 or compensation signal control end SW2, reduce the refreshing frequency of the real time data read-write that realizes external compensation, thereby reduce power consumption.
In the specific implementation, cache module 06 in the above-mentioned image element circuit that the utility model embodiment provides, as shown in Figure 3, it can be a capacitor C 1, one end a of capacitor C 1 is connected between the output terminal of sampling module 03 and the input end of processing module 05, and be connected between the input end of compensating module 04 and the output terminal of processing module 05 other end b ground connection.Like this, by capacitor charge and discharge process, sampled voltage or bucking voltage are carried out to buffer memory and release, can preferably the driving voltage of luminescent device 01 be sampled or be compensated, thereby the decay of the electric property to luminescent device 01 compensates, to guarantee the homogeneity of display system display brightness.
In the specific implementation, the processing module 05 in the above-mentioned image element circuit that the utility model embodiment provides, as shown in Figure 3, specifically comprises:
AD conversion unit 051, converts corresponding digital signal to for the simulating signal of driving voltage that sampling module 03 is sampled;
Storage unit 052, for the luminosity of storing in advance the luminescent device 01 of setting up along with the variation of service time and the corresponding relation of driving voltage;
Determining unit 053, for the digital signal after changing according to AD conversion unit 051, and the luminosity of pre-stored luminescent device is along with the variation of service time and the corresponding relation of driving voltage, determines the digital signal of the bucking voltage corresponding with driving voltage;
D/A conversion unit 054, for simulating signal corresponding to the digital signal of bucking voltage definite determining unit 053 converting to.
Fig. 5 and Fig. 6 show respectively the circuit diagram of AD conversion unit and D/A conversion unit, because the principle of work of analog to digital conversion circuit and D/A converting circuit is same as the prior art, repeat part repeat no more at this.
In the specific implementation, the luminosity of luminescent device 01 of the cell stores in the processing module 05 in the image element circuit that the utility model embodiment provides and the corresponding relation of driving voltage, it is the VL curve according to luminescent device 01, be that the monochromatic luminosity of luminescent device 01 is along with the corresponding relation between time and driving voltage, as shown in Figure 7, the corresponding look-up table of setting up, and pre-stored in storage unit 052.Processing module 05 is the look-up table along with the variation of service time and the corresponding relation of driving voltage according to the luminosity of the pre-stored luminescent device 01 of storage unit 052, determine the bucking voltage corresponding with driving voltage, bucking voltage is outputed to compensating module 04, bucking voltage is outputed to luminescent device 01 by compensating module 04, driving voltage to luminescent device 01 compensates, thereby the decay to luminescent device electric property compensates, avoid the brightness occurring while driving luminescent device 01 due to luminescent device 01 driving voltage identical along with the growth of service time adopts to reduce, and the inhomogeneous problem of the display brightness of the display panel causing, the homogeneity that has improved display panel display brightness has been guaranteed the homogeneity of display system display brightness.
Based on same utility model design, the utility model embodiment also provides a kind of display device, comprises above-mentioned any one image element circuit that the utility model embodiment provides.Because the principle that this display device is dealt with problems is similar to image element circuit, therefore the enforcement of this display device can be referring to the enforcement of image element circuit, repeats part and repeat no more.
In the specific implementation, the above-mentioned display device that the utility model embodiment provides can be applied to display panels, also can be applied to organic EL display panel, does not limit at this.This display device can be display, mobile phone, TV, notebook, all-in-one etc., be and will be understood by those skilled in the art that to have for other requisite ingredient of display device, do not repeat at this, also should not serve as restriction of the present utility model.
Based on same utility model design, the utility model embodiment also provides a kind of driving method of image element circuit, as shown in Figure 8, comprises the steps:
S101, at driver module during to luminescent device input driving voltage, sampling module is sampled to driving voltage, and under the control of sampled signal control end, the driving voltage sampling is input to processing module;
In the specific implementation, sampling module can be sampled to driving voltage at driver module between every frame of luminescent device input driving voltage, also can within the time of every frame, sample to driving voltage, does not limit at this;
The driving voltage that S102, processing module sample according to sampling module, and the luminosity of pre-stored luminescent device is along with the variation of service time and the corresponding relation of driving voltage, determine the bucking voltage corresponding with driving voltage, and bucking voltage is input to compensating module;
The bucking voltage that S103, compensating module are determined processing module under the control of compensation signal control end is input to luminescent device.
In the driving method of the above-mentioned image element circuit that the utility model embodiment provides, in the time that driver module provides driving voltage for luminescent device, sampling module is sampled to this driving voltage, the driving voltage that processing module samples according to sampling module is processed, and the luminosity of pre-stored luminescent device is along with the variation of service time and the corresponding relation of driving voltage, obtain the bucking voltage corresponding with this driving voltage, the bucking voltage that compensating module is determined processing module is input to corresponding luminescent device, realize according to the difference of luminescent device service time the driving voltage of luminescent device has been carried out to different compensate functions, avoid the brightness meeting of the luminescent device occurring while driving luminescent device due to the luminescent device driving voltage identical along with the growth of service time adopts to reduce, and the inhomogeneous problem of the display brightness of the display panel causing, improve the homogeneity of display panel display brightness.
In the specific implementation, in the driving method of the above-mentioned image element circuit that the utility model embodiment provides, the driving voltage that processing module samples according to sampling module, and the luminosity of pre-stored luminescent device is along with the variation of service time and the corresponding relation of driving voltage, determine the bucking voltage corresponding with driving voltage, can adopt following manner to realize:
The simulating signal of the driving voltage that first, the AD conversion unit in processing module samples sampling module converts corresponding digital signal to;
Then, in processing module really order unit according to the digital signal after AD conversion unit conversion, along with the variation of service time and the corresponding relation of driving voltage, determine the digital signal of the bucking voltage that luminescent device is compensated with the luminosity of the pre-stored luminescent device of storage unit;
Finally, the D/A conversion unit in processing module simulating signal corresponding to the digital signal of bucking voltage definite determining unit converts to.
The utility model embodiment provides a kind of image element circuit and display device, in the above-mentioned image element circuit that the utility model embodiment provides, in the time that driver module provides driving voltage for luminescent device, sampling module is sampled to this driving voltage, the driving voltage that processing module samples according to sampling module is processed, and the luminosity of pre-stored luminescent device is along with the variation of service time and the corresponding relation of driving voltage, obtain the bucking voltage corresponding with this driving voltage, the bucking voltage that compensating module is determined processing module is input to corresponding luminescent device, realize according to the difference of luminescent device service time the driving voltage of luminescent device has been carried out to different compensate functions, avoid the brightness meeting of the luminescent device occurring while driving luminescent device due to the luminescent device driving voltage identical along with the growth of service time adopts to reduce, and the inhomogeneous problem of the display brightness of the display panel causing, improve the homogeneity of display panel display brightness.
Obviously, those skilled in the art can carry out various changes and modification and not depart from spirit and scope of the present utility model the utility model.Like this, if these amendments of the present utility model and within modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model is also intended to comprise these changes and modification interior.
Claims (8)
1. an image element circuit, comprises luminescent device and is used to described luminescent device that the driver module of driving voltage is provided, and it is characterized in that, also comprises: sampling module, compensating module and processing module; Wherein,
The input end of described sampling module is connected with the output terminal of described driver module, and described sampling module is sampled for the driving voltage that described driver module is provided;
The input end of described processing module is connected with the output terminal of described sampling module, the driving voltage of described processing module for sampling according to described sampling module, and the luminosity of pre-stored described luminescent device is along with the variation of service time and the corresponding relation of driving voltage, determines the bucking voltage corresponding with described driving voltage;
The input end of described compensating module is connected with the output terminal of described processing module, and described compensating module is input to described luminescent device for the bucking voltage that described processing module is determined.
2. image element circuit as claimed in claim 1, is characterized in that, described sampling module comprises: the first film transistor and the second thin film transistor (TFT); Wherein,
The transistorized grid of described the first film and sampled signal control end are electrical connected, and described sampled signal control end is for controlling described sampling module in conducting state in sampling time section;
The transistorized drain electrode of described the first film is electrical connected with the source electrode of described the second thin film transistor (TFT) and the output terminal of described driver module respectively;
The grid of the transistorized source electrode of described the first film and described the second thin film transistor (TFT) is electrical connected;
The drain electrode of described the second thin film transistor (TFT) and the input end of described processing module are electrical connected.
3. image element circuit as claimed in claim 2, is characterized in that, described compensating module comprises: the 3rd thin film transistor (TFT) and the 4th thin film transistor (TFT); Wherein,
The grid of described the 3rd thin film transistor (TFT) and compensation signal control end are electrical connected, and described compensation signal control end is for controlling described compensating module in conducting state in make-up time section;
The drain electrode of described the 3rd thin film transistor (TFT) is electrical connected with described the 4th source electrode of thin film transistor (TFT) and the output terminal of described processing module respectively;
The grid of described the 3rd thin film transistor (TFT) source electrode and described the 4th thin film transistor (TFT) is electrical connected;
The drain electrode of described the 4th thin film transistor (TFT) and described luminescent device input end are electrical connected.
4. image element circuit as claimed in claim 3, is characterized in that, the input end of described processing module and output terminal are same port;
Described sampled signal control end and described compensation signal control end timesharing drive corresponding described sampling module and compensating module in conducting state.
5. image element circuit as claimed in claim 4, it is characterized in that, also comprise: be connected between the output terminal of described sampling module and the input end of described processing module, and be connected in the cache module between the input end of described compensating module and the output terminal of described processing module;
Described cache module is for drive voltage signal or the definite compensation voltage signal of described processing module of sampling module sampling described in buffer memory.
6. image element circuit as claimed in claim 5, it is characterized in that, described cache module comprises electric capacity, one end ground connection of described electric capacity, the other end is connected between the output terminal of described sampling module and the input end of described processing module, and is connected between the input end of described compensating module and the output terminal of described processing module.
7. the image element circuit as described in claim 1-6 any one, is characterized in that, described processing module comprises:
AD conversion unit, converts corresponding digital signal to for the simulating signal of driving voltage that described sampling module is sampled;
Storage unit, for the luminosity of storing in advance the described luminescent device of setting up along with the variation of service time and the corresponding relation of driving voltage;
Determining unit, for the digital signal after changing according to described AD conversion unit, and the luminosity of pre-stored described luminescent device is along with the variation of service time and the corresponding relation of driving voltage, determines the digital signal of the bucking voltage corresponding with described driving voltage;
D/A conversion unit, for simulating signal corresponding to the digital signal of bucking voltage definite described determining unit converting to.
8. a display device, is characterized in that, comprises the image element circuit as described in claim 1-7 any one.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104021755A (en) * | 2014-05-22 | 2014-09-03 | 京东方科技集团股份有限公司 | Pixel circuit, driving method and display device |
| CN108428431A (en) * | 2018-03-19 | 2018-08-21 | 联想(北京)有限公司 | A kind of screen and display compensation method |
| CN110890065A (en) * | 2019-11-01 | 2020-03-17 | 深圳市华星光电半导体显示技术有限公司 | Control method and control device of display panel |
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2014
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| CN104021755A (en) * | 2014-05-22 | 2014-09-03 | 京东方科技集团股份有限公司 | Pixel circuit, driving method and display device |
| WO2015176420A1 (en) * | 2014-05-22 | 2015-11-26 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display device thereof |
| CN108428431A (en) * | 2018-03-19 | 2018-08-21 | 联想(北京)有限公司 | A kind of screen and display compensation method |
| CN110890065A (en) * | 2019-11-01 | 2020-03-17 | 深圳市华星光电半导体显示技术有限公司 | Control method and control device of display panel |
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