CN104021755A - Pixel circuit, driving method and display device - Google Patents
Pixel circuit, driving method and display device Download PDFInfo
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- CN104021755A CN104021755A CN201410219292.8A CN201410219292A CN104021755A CN 104021755 A CN104021755 A CN 104021755A CN 201410219292 A CN201410219292 A CN 201410219292A CN 104021755 A CN104021755 A CN 104021755A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
Abstract
The invention discloses a pixel circuit, its driving method and a display device. In the pixel circuit provided by the embodiment of the invention, when a driver module provides driving voltage for a luminescent device, a sampling module samples the driving voltage; a processing module processes according to the driving voltage sampled by the sampling module and correspondence between pre-stored luminance of the luminescent device changing with the service time and the driving voltage so as to obtain compensation voltage corresponding to the driving voltage; a compensation module inputs the compensation voltage determined by the processing module into the corresponding luminescent device. Thus, the function of differently compensating the driving voltage of the luminescent device according to different service times of the luminescent device; the problem that display brightness of a display panel is not uniform because brightness of the luminescent device is reduced when the same driving voltage is adopted to drive the luminescent device with increasing of the service time of the luminescent device is solved; and display brightness uniformity of the display panel is raised.
Description
Technical field
The present invention relates to display technique field, relate in particular to a kind of image element circuit, its driving method 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 reasons such as manufacturing process and device agings, can make the threshold voltage V of the driving transistors of image element circuit
ththere is unevenness, with regard to having caused flowing through the electric current of each pixel OLED, change and make display brightness inhomogeneous like this, also can affect the display effect of whole image.
Therefore, when carrying out pixel circuit design, generally can introduce corresponding internal compensation technology, the image element circuit with internal compensation function, as shown in Figure 1, comprising: driving transistors T1, switching transistor T2, input control circuit module, capacitor C and OLED device; When 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.
Summary of the invention
The embodiment of the present invention provides a kind of image element circuit, its driving method 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 embodiment of the present invention 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 embodiment of the present invention provides, when 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, realized according to the difference of luminescent device service time the driving voltage of luminescent device has been carried out to different compensate functions, the brightness meeting of the luminescent device having occurred while having avoided driving luminescent device due to the luminescent device driving voltage identical along with the growth of service time adopts reduces, and the inhomogeneous problem of the display brightness of the display panel causing, improved the homogeneity of display panel display brightness.
In a kind of possible embodiment, in the above-mentioned image element circuit that the embodiment of the present invention 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 embodiment of the present invention 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 embodiment of the present invention 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 embodiment of the present invention 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 embodiment of the present invention 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 embodiment of the present invention 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 the definite bucking voltage of described determining unit converting to.
The embodiment of the present invention provides a kind of display device, comprises above-mentioned any one image element circuit that the embodiment of the present invention provides.
The embodiment of the present invention provides a kind of driving method of image element circuit, comprising:
When driver module is inputted driving voltage to luminescent device, sampling module is sampled to described driving voltage, and under the control of sampled signal control end, the described driving voltage sampling is input to processing module;
The described driving voltage that processing module samples 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, determine the bucking voltage corresponding with described driving voltage, and described bucking voltage is input to compensating module;
The bucking voltage that described compensating module is determined described processing module under the control of compensation signal control end is input to described luminescent device.
In a kind of possible embodiment, in the above-mentioned pixel circuit drive method that the embodiment of the present invention provides, the described driving voltage that described processing module samples 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, determine the bucking voltage corresponding with described driving voltage, specifically comprise:
The simulating signal of the driving voltage that the AD conversion unit in described processing module samples described sampling module converts corresponding digital signal to;
In described processing module really order unit according to the digital signal after the conversion of 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 that described luminescent device is compensated;
D/A conversion unit in described processing module simulating signal corresponding to the digital signal of the definite bucking voltage of described determining unit converts to.
Accompanying drawing explanation
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 embodiment of the present invention;
The concrete structure schematic diagram of the image element circuit that Fig. 3 provides for the embodiment of the present invention;
Sampled signal control end in the image element circuit that Fig. 4 provides for the embodiment of the present invention 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 embodiment of the present invention;
The structural representation of the D/A converting circuit that Fig. 6 provides for the embodiment of the present invention;
The luminosity of luminescent device and the corresponding relation curve of driving voltage that Fig. 7 provides for the embodiment of the present invention;
The process flow diagram of the driving method of the image element circuit that Fig. 8 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the image element circuit that the embodiment of the present invention is provided, its driving method and display device is described in detail.
A kind of image element circuit that the embodiment of the present invention 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 embodiment of the present invention provides, driver module 02 provides driving voltage for luminescent device 01, when 02 pair of luminescent device of driver module, 01 input driving voltage, 03 pair of driving voltage of sampling module is sampled, and the driving voltage of sampling is outputed to processing module 05; 05 pair of sampled voltage of processing module is processed, and determines the bucking voltage corresponding with driving voltage, and bucking voltage is outputed to compensating module 04; Compensating module 04 is input to luminescent device 01 by the definite bucking voltage of processing module 05.
In the above-mentioned image element circuit that the embodiment of the present invention provides, when driver module 02 provides driving voltage for luminescent device 01, 03 pair of this driving voltage of sampling module is sampled, 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, realized 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, the brightness meeting of the luminescent device having occurred while having avoided driving luminescent device 01 due to luminescent device 01 driving voltage identical along with the growth of service time adopts reduces, and the inhomogeneous problem of the display brightness of the display panel causing, improved the homogeneity of display panel display brightness.
Further, in the above-mentioned image element circuit that the embodiment of the present invention 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.When 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
mendbucking voltage for compensating module 04 output.Like this, by the course of work of above-mentioned image element circuit, realized the driving voltage of luminescent device 01 has been compensated, the brightness having occurred while having avoided driving luminescent device 01 due to luminescent device 01 driving voltage identical along with the growth of service time adopts reduces, 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, at this, does not limit.
Particularly, above-mentioned luminescent device 01 generally refers to Organic Light Emitting Diode (OLED), can certainly be other electroluminescent devices, at this, does not limit.
Further, the above-mentioned image element circuit that the embodiment of the present invention 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 for controlling sampling module 03 in conducting state in sampling time section;
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 embodiment of the present invention 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, at this, do not limit.The following stated all take the first film transistor T 1 and the second thin film transistor (TFT) T2 as P transistor npn npn be example, the above-mentioned sampling module 03 that the embodiment of the present invention provides is when 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 an output terminal from driver module 02 to the one way signal path of the input end of processing module 05, under the control of sampled signal control end SW1, the driving voltage of driver module 02 output 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 embodiment of the present invention 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 embodiment of the present invention 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, at this, do not limit.The following stated all take the 3rd thin film transistor (TFT) T3 and the 4th thin film transistor (TFT) T4 as P transistor npn npn be example, the above-mentioned compensating module 04 that the embodiment of the present invention provides is when 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 an output terminal from processing module 05 to the one way signal path of the input end of luminescent device 01, the bucking voltage of processing module 05 output is input to the input end of luminescent device 01 under the control of compensation signal control end SW2.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 in the embodiment of the present invention, 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, at synchronization, only allow one of them module in running order, 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, guarantee 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 embodiment of the present invention 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 drive voltage signal or the definite compensation voltage signal of processing module 05 of 03 sampling.Like this, adopt 06 pair of sampled voltage signal of cache module or compensation voltage signal to carry out buffer memory, can carry out on the one hand electric current to the signal conversion of 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 embodiment of the present invention 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 to the electric property of 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 embodiment of the present invention 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 the definite bucking voltage of 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 embodiment of the present invention 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, compensating module 04 outputs to luminescent device 01 by bucking voltage, driving voltage to luminescent device 01 compensates, thereby the decay to luminescent device electric property compensates, the brightness having occurred while having avoided driving luminescent device 01 due to luminescent device 01 driving voltage identical along with the growth of service time adopts reduces, 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 inventive concept, the embodiment of the present invention also provides a kind of display device, comprises above-mentioned any one image element circuit that the embodiment of the present invention provides.Because the principle that this display device is dealt with problems is similar to image element circuit, so the enforcement of this display device can, referring to the enforcement of image element circuit, repeat part and repeat no more.
In the specific implementation, the above-mentioned display device that the embodiment of the present invention provides can be applied to display panels, also can be applied to organic EL display panel, at this, does not limit.This display device can be display, mobile phone, TV, notebook, all-in-one etc., for other requisite ingredient of display device, be and will be understood by those skilled in the art that to have, at this, do not repeat, should be as limitation of the present invention yet.
Based on same inventive concept, the embodiment of the present invention 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, to driving voltage, sample, and at this, does not limit;
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 embodiment of the present invention provides, when 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, realized according to the difference of luminescent device service time the driving voltage of luminescent device has been carried out to different compensate functions, the brightness meeting of the luminescent device having occurred while having avoided driving luminescent device due to the luminescent device driving voltage identical along with the growth of service time adopts reduces, and the inhomogeneous problem of the display brightness of the display panel causing, improved the homogeneity of display panel display brightness.
In the specific implementation, in the driving method of the above-mentioned image element circuit that the embodiment of the present invention 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 the definite bucking voltage of determining unit converts to.
The embodiment of the present invention provides a kind of image element circuit, its driving method and display device, in the above-mentioned image element circuit that the embodiment of the present invention provides, when 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, realized according to the difference of luminescent device service time the driving voltage of luminescent device has been carried out to different compensate functions, the brightness meeting of the luminescent device having occurred while having avoided driving luminescent device due to the luminescent device driving voltage identical along with the growth of service time adopts reduces, and the inhomogeneous problem of the display brightness of the display panel causing, improved the homogeneity of display panel display brightness.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (10)
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 the definite bucking voltage of 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.
9. a driving method for the image element circuit as described in claim 1-7 any one, is characterized in that, comprising:
When driver module is inputted driving voltage to luminescent device, sampling module is sampled to described driving voltage, and under the control of sampled signal control end, the described driving voltage sampling is input to processing module;
The described driving voltage that processing module samples 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, determine the bucking voltage corresponding with described driving voltage, and described bucking voltage is input to compensating module;
The bucking voltage that described compensating module is determined described processing module under the control of compensation signal control end is input to described luminescent device.
10. the driving method of image element circuit as claimed in claim 9, it is characterized in that, the described driving voltage that described processing module samples 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, determine the bucking voltage corresponding with described driving voltage, specifically comprise:
The simulating signal of the driving voltage that the AD conversion unit in described processing module samples described sampling module converts corresponding digital signal to;
In described processing module really order unit according to the digital signal after the conversion of 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 that described luminescent device is compensated;
D/A conversion unit in described processing module simulating signal corresponding to the digital signal of the definite bucking voltage of described determining unit converts to.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410219292.8A CN104021755B (en) | 2014-05-22 | 2014-05-22 | A kind of image element circuit, its driving method and display device |
| PCT/CN2014/086311 WO2015176420A1 (en) | 2014-05-22 | 2014-09-11 | Pixel circuit, driving method thereof and display device thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410219292.8A CN104021755B (en) | 2014-05-22 | 2014-05-22 | A kind of image element circuit, its driving method and display device |
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| Publication Number | Publication Date |
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| CN104021755A true CN104021755A (en) | 2014-09-03 |
| CN104021755B CN104021755B (en) | 2016-09-07 |
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| CN201410219292.8A Active CN104021755B (en) | 2014-05-22 | 2014-05-22 | A kind of image element circuit, its driving method and display device |
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| WO (1) | WO2015176420A1 (en) |
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| WO2015176420A1 (en) | 2015-11-26 |
| CN104021755B (en) | 2016-09-07 |
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