CN101283391A - Display apparatus and drive control method thereof - Google Patents

Display apparatus and drive control method thereof Download PDF

Info

Publication number
CN101283391A
CN101283391A CNA2006800044944A CN200680004494A CN101283391A CN 101283391 A CN101283391 A CN 101283391A CN A2006800044944 A CNA2006800044944 A CN A2006800044944A CN 200680004494 A CN200680004494 A CN 200680004494A CN 101283391 A CN101283391 A CN 101283391A
Authority
CN
China
Prior art keywords
display
display pixel
row
voltage
pixel
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CNA2006800044944A
Other languages
Chinese (zh)
Other versions
CN101283391B (en
Inventor
尾崎刚
小仓润
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Soras Oled
Original Assignee
Casio Computer Co Ltd
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
Priority claimed from JP2005153382A external-priority patent/JP5110341B2/en
Application filed by Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Priority claimed from PCT/JP2006/310616 external-priority patent/WO2006126703A2/en
Publication of CN101283391A publication Critical patent/CN101283391A/en
Application granted granted Critical
Publication of CN101283391B publication Critical patent/CN101283391B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

A display apparatus is disclosed. A display panel includes a plurality of display pixels arranged at intersections of a plurality of scanning lines and a plurality of data lines. A scanning drive unit sequentially applies a scanning signal to each of the scanning lines and sets the corresponding display pixels to a selection state. A data drive unit generates a gradation signal corresponding to the display data and supplies the gradation signal to the display pixels. A power source drive unit supplies to the display pixels a drive voltage for controlling a drive state of each of the display pixels. A drive control unit controls the power source drive unit to operate to set the display pixels to a non-display operation state during a non-display period, and controls the scanning drive unit to operate to set the display pixels to the selection state during the non-display period.

Description

Display device and drive controlling method thereof
Technical field
The present invention relates to display device and display drive method thereof.Particularly, the present invention relates to a kind of display device and drive controlling method thereof, this equipment is provided with display panel, and it has a plurality of current-control type optical elements disposed thereon with displays image information.
Background technology
In recent years, consumption is very general as the monitor ﹠ display of personal computer and video equipment than the light weight and the thin display spare of low electric power amount.Especially, liquid crystal display (LCD) equipment is applied as mobile phone, digital camera, PDA(Personal Digital Assistant) and widely such as the display device of the portable set (cell phone) of electronic dictionary.
As the display device of future generation after this LCD equipment, research and develop towards comprehensively popularizing of the self-luminous display device with display panel (self-luminous display), in described display panel according to cells arranged in matrix organic electroluminescent device (organic EL), inorganic el element (inorganic EL element) or such as the emissive type optical element of light emitting diode (LED).
Especially, compare with above-mentioned LCD, the emissive type display device that the driven with active matrix pattern is applied to it has higher demonstration response speed.In addition, the emissive type display device does not have the dependence to field angle, and can obtain the raising of the sharpness of brightness/contrast and image quality.In addition, it is backlight that the emissive type display device need not use in LCD, and therefore aspect the portable device that is applied to can further reduce thickness and weight and/or further reduce power consumption, self-luminous display has very favorable characteristic.
Figure 25 is the schematic diagram that the major part of active matrix self-luminous type display device of the prior art is shown.
Figure 26 is the sequential chart of an example that the display drive method of active matrix self-luminous type display device of the prior art is shown.
Figure 27 is the sequential chart that another example of active matrix self-luminous type display device of the prior art is shown.
Here, in Figure 26 and 27, compare with described embodiment subsequently for convenience, the display drive method under the following situation is shown: described equipment has the structure that display panel wherein is provided with the display pixel of 12 row (the first to the 12 row).In Figure 26 and 27, symbol k represents positive integer.By way of parenthesis, hacures are set and are used for illustrating the write operation of each view data of going and the write operation and the display operation of display operation and blanking data.
Usually has as shown in figure 25 structure such as the active array type display apparatus of liquid crystal display and emissive type display device, it comprises: display panel 110P wherein is arranged on a plurality of display pixel EMp near the point of crossing of the multi-strip scanning line SLp that is provided with according to the row and column direction and data line DLp according to two dimensional form; Scanner driver 120P, it is connected with sweep trace SLp; And data driver 140P, it is connected with data line DL.
For example, as shown in figure 26, in the display driver control in having the display device of this structure, originally select level sweep signal Ssel by sequentially applying, come sequentially to set each display pixel EMp that goes for selection mode from the sweep trace SLp of scanner driver 120P to each row.Then, synchronous constantly with the selection of each row, apply voltage gradation (gradation voltage) Vpix from the data line DLp of data driver 140P to each row, will remain to each display pixel EMp (view data write cycle time) based on the component of voltage of voltage gradation Vpix thus corresponding to the view data in this row (video data).As a result, in each display pixel EMp, carry out and the corresponding grade control of above-mentioned component of voltage, so that execution shows desired images information with the corresponding display operation of view data (light emission operation) and on display panel.
Subsequently, by sequentially applying non-selection level sweep signal Ssel to sweep trace SLp, set each display pixel EMp that goes for nonselection mode from scanner driver 120P.Yet, when the component of voltage that will write at once before remains in each display pixel, continue (image display periods) with the corresponding display operation of view data, and this operation last till always be written to next view data among each display pixel EMp in capable till.Such control method is called maintenance.
In this maintenance display control method, provide such characteristic, promptly in the display operation of still image, be difficult to glimmer, because in nearly all cycle in a frame period, continue with the corresponding display operation of view data (light emission operation).Yet, on the other hand, in the demonstration of moving image, the image information that in the previous frame period, shows can be used as afterimage and visually become be more prone to the identification, and the smudgy of image information and obfuscation (stain) therefore take place, and this can cause the deterioration of image quality.
Then, improve the display drive method of image quality as the smudgy and flaw that is used for the display operation by suppressing moving image, there is a kind of known technology, in a frame period, except above-mentioned view data write cycle time and image display periods, it is used to carry out the operation (blanking data write cycle) that the blanking data are provided to each data line from data driver, described blanking data are used to carry out the operation (light emission operation) that shows each display pixel EMp under the lowest class, or are used to carry out non-display operation (non-light emission operation) and operate (black display cycle) based on the black display of blanking data.As a result, be inserted into the black display cycle of determining length in the frame period and the black display state is set.Therefore, the display drive method (for convenience, being called as " false pulse type display drive method ") that image display periods wherein reduces relatively can be realized, and the image quality in the display operation of moving image can be improved.
Yet, in this false pulse type display drive method, as shown in figure 27, in a frame period, need to set the write cycle time of the blanking data that provide by data driver and black display cycle and the write cycle time and the image display periods of the view data that provides by data driver.Owing to this reason, in a frame period, only carry out the write operation and the image display operations of the view data that provides by data driver, as shown in Figure 26.Compare with the situation of wherein not carrying out the black display operation, shortened the time that to distribute to the write operation of view data, and therefore become and to come with high literary sketch view data by improving the driving frequency (being the driving frequency of display device) relevant with the write operation of view data.
By this way, when the write cycle time that shortens view data (video data), make in the time of to carry out a little operation with two-forty, insufficient owing to being used for respect to the caused signal delay of CR time constant the deficiency of time that view data is write each display pixel is write, described CR time constant is produced by the parasitics of the resistive element on the signal routing of display panel and capacitive element etc.Therefore, can not correctly carry out and the corresponding grade demonstration of view data.
Summary of the invention
The advantage that the present invention has is, the present invention can provide a kind of display device, it comprise active matrix type display panel and with the corresponding displays image information of video data, this equipment can show the moving image with gratifying display quality, simultaneously can with the corresponding suitably grade displays image information of video data, but also can provide its display drive method.
A kind of display device according to the above-mentioned advantage of acquisition of the present invention comprises: display panel, it comprise be arranged on thereon the multi-strip scanning line that is provided with according to line direction with according near a plurality of display pixels each point of crossing of many data lines of column direction setting; Scan drive cell, its sequentially each bar in described multi-strip scanning line apply sweep signal, and will be set at selection mode with the corresponding described display pixel of each bar sweep trace; The data-driven unit, it produces and the corresponding level signal of video data, and this grade signal is offered the display pixel that is set at selection mode; The power drives unit, it is provided for controlling the driving voltage of the driving condition of each display pixel to display pixel; And driving control unit, its: (i) control power drives unit operations is to be set at non-display operation state with display pixel in the non-display cycle, and display pixel does not show video data in the described non-display cycle; And (ii) the gated sweep driver element is operated in the non-display cycle described display pixel is set at selection mode.
A kind of control display device according to the present invention is to obtain the drive controlling method of above-mentioned advantage, wherein said display device comprises display panel, this display panel comprise be arranged on thereon the multi-strip scanning line that is provided with according to line direction with according near a plurality of display pixels the point of crossing of many data lines of column direction setting, this method comprises: line by line display pixel sequentially is set at selection mode; Line by line will with the corresponding level signal of video data sequentially offer be set at selection mode each the row in display pixel; With the corresponding bias state of level signal under each display pixel is set at the display operation state; And display pixel does not show in non-display cycle of video data display pixel is set at not show state therein; Wherein display pixel is set at selection mode, is set simultaneously and is non-display operation state.
Description of drawings
Fig. 1 is the schematic block diagram that illustrates according to first embodiment of display device of the present invention;
Fig. 2 illustrates the structural drawing that is applied to according to the major part of an example of the display panel of the display device of first embodiment and peripheral circuit thereof;
Fig. 3 illustrates the circuit structure diagram that is applied to according to an example of the display pixel of the display device of first embodiment;
Fig. 4 illustrates the schematic block diagram that can be applied to according to an example of the data driver of the display device of first embodiment;
Fig. 5 illustrates the sequential chart that is applied to according to the drive controlling method in the display pixel of the display device of first embodiment;
Fig. 6 A and 6B are the concept maps (conceptual diagram) that illustrates respectively according to not light emission operation in the display pixel of first embodiment and write operation;
Fig. 7 is the concept map that illustrates according to the light emission operation in the display pixel of first embodiment;
Fig. 8 is the sequential chart that illustrates according to an example of the display drive method of the display device of first embodiment;
Fig. 9 is the schematic block diagram that illustrates according to second embodiment of display device of the present invention;
Figure 10 illustrates the structural drawing that is applied to according to the major part of an example of the display panel of the display device of second embodiment and peripheral circuit thereof;
Figure 11 illustrates the circuit structure diagram that is applied to according to an example of the display pixel of the display device of second embodiment;
Figure 12 illustrates the sequential chart that is applied to according to the drive controlling method in the display pixel of the display device of second embodiment;
Figure 13 A and 13B illustrate according to the reverse biased setting operation in the display pixel of second embodiment and the concept map of non-light emission operation;
Figure 14 A and 14B are the concept maps that illustrates according to write operation in the display pixel of second embodiment and light emission operation;
Figure 15 illustrates to be illustrated in the curve map of test findings that is set at the change amount of the threshold voltage under the situation of reverse bias condition according to the on-off element that will be used for display driver in the display pixel of second embodiment;
Figure 16 is the sequential chart that illustrates according to an example of the display drive method of the display device of second embodiment;
Figure 17 illustrates the structural drawing that is applied to according to an example of the display panel of the display device of the 3rd embodiment;
Figure 18 illustrates the structural drawing that is applied to according to the major part of an example of the peripheral circuit of the display panel of the display device of the 3rd embodiment;
Figure 19 illustrates the structural drawing that is applied to according to the major part of another example of the display panel of the display device of the 3rd embodiment and peripheral circuit thereof;
Figure 20 is the sequential chart that illustrates according to first example of the display drive method of the display device of the 3rd embodiment;
Figure 21 is the sequential chart that illustrates according to second example of the display driver control method of the display device of the 3rd embodiment;
Figure 22 illustrates the structural drawing that is applied to according to the major part of an example of the display panel of the display device of the 4th embodiment and peripheral circuit thereof;
Figure 23 is the sequential chart that illustrates according to first example of the display drive method of the display device of the 4th embodiment;
Figure 24 is the sequential chart that illustrates according to second example of the display driver control method of the display device of the 4th embodiment;
Figure 25 is the concept structure figure that the major part of Control of Voltage active matrix self-luminous display of the prior art is shown;
Figure 26 is the equivalent circuit diagram that the structure example of the display pixel that can be used for self-luminous display of the prior art is shown;
Figure 27 is the sequential chart of an example that the display drive method of display panel of the prior art is shown.
Embodiment
Embodiment shown in hereinafter inciting somebody to action with reference to the accompanying drawings describes in detail according to display device of the present invention and drive controlling method thereof.
First embodiment
Schematic structure according to the display device of first embodiment will be described at first, with reference to the accompanying drawings.Fig. 1 is the schematic block diagram that illustrates according to first embodiment of display device of the present invention.
Fig. 2 illustrates the structural drawing that is applied to according to the major part of an example of the display panel of the display device of first embodiment and peripheral circuit thereof.
Incidentally, in embodiment shown below, the emissive type display device will be described, wherein display panel has following structure: be provided as a plurality of display pixels that are provided with the emissive type light-emitting component of optical element with two dimensional form, this display device is carried out brightness degree (luminance gradation) by the optical element that allows each display pixel and is come displays image information with the corresponding light emission operation of video data (view data).Yet, the invention is not restricted to this.As liquid crystal display, have a kind of display device to allow, it provides the grade of desired image information to show (display operation) by transmitted light or reflected light as follows: according to video data each display pixel is carried out grade control (being set at bias state according to video data).
As illustrated in fig. 1 and 2, the display device 100A according to present embodiment comprises display panel 110, scanner driver (scan drive cell) 120, power supply driver (power drives unit) 130, data driver (data-driven unit) 140, system controller (driving control unit) 150 and shows signal generation circuit 160.Display panel 110 has near a plurality of display pixel EM the point of crossing of multi-strip scanning line SL and many data line DL disposed thereon, described sweep trace SL and data line DL be arranged to be expert at mutual vertically usually and column direction on extend, pixel is provided with described subsequently display driver circuit and light-emitting component.Scanner driver 120 is connected with the sweep trace SL of display panel 110, and sequentially applies selection level (high level) sweep signal Vsel to sweep trace SL at predetermined instant, and the display pixel EM with each row is set at selection mode thus.Power supply driver 130 is connected with many power lead VL of sweep trace SL in being arranged to be parallel to each row, and sequentially applies driving voltage Vsc to power lead VL at predetermined instant.Data driver 140 is connected with the data line DL of display panel 110, and provides and the corresponding level signal of video data (grading current Idata) to display pixel EM via each data line DL.System controller 150 comes the mode of operation of gated sweep driver 120, power supply driver 130 and data driver 140 at least according to the timing signal that is provided by described shows signal generation circuit 160 subsequently, to produce and output is used for carrying out at display panel 110 scan control signal, power control signal and the data controlling signal of predetermined picture display operations.Shows signal generation circuit 160 produces video data and these data is offered data driver 140 according to the picture signal that for example provides from the outside of display device 100A, and extracts or produce according to video data be used for showing that the timing signal (system clock etc.) of predetermined image information is to provide timing signal to system controller 150 on display panel 110.
Next, with specify in the above-mentioned structure each.
(display panel and display pixel)
Fig. 3 illustrates the circuit structure diagram that is applied to according to an example of the display pixel (display driver circuit) of the display device of present embodiment.
Incidentally, in the present embodiment, wherein provide situation with the corresponding circuit structure of drive controlling method (display driver circuit) of current class appointing system with explanation.This drive controlling method is by providing the grading current that has with the corresponding current value of video data to display pixel, the display driver electric current that allows to have with the corresponding current value of video data flows in the light-emitting component that is arranged on each display pixel, carries out the light emission operation (display operation) with expectation brightness degree thus.Yet, the invention is not restricted to this.For example, the present invention can have the corresponding circuit structure of drive controlling method with the electric pressure appointing system.This drive controlling method is by applying the voltage gradation that has with video data correspondent voltage value, the display driver electric current that allows to have with the corresponding current value of video data flows in the light-emitting component of each display pixel, carries out the light emission operation with expectation brightness degree thus.
By for example originally be expert at according to two-dimensional approach and column direction among a plurality of display pixel EM of being provided with, the driving voltage that sequentially stops to be used for display driver is applied to the display pixel EM that each is gone, and is applied to sequentially allow the display pixel EM in each row to carry out not light emission operation (non-display operation) in predetermined period according to the display panel 110 of display device 110A of the present invention.Afterwards, order is carried out the write operation of video data, so that control the display pixel EM of each row has the predetermined luminance grade with execution sequentially light emission operation (display operation).
As the structure that is used to obtain this purpose, for according to the display pixel EM in the display panel 110 of present embodiment, can use the display driver circuit DC1 that for example comprises as shown in Figure 3 and the structure of known organic EL (light-emitting component) OEL.Display driver circuit DC1 sets display pixel EM for selection mode according to the sweep signal Vsel that is applied by scanner driver 120 usually, the level signal (grading current Idata) that provides by data driver 140 is provided under selection mode, and generation and the corresponding display driver electric current of level signal.Organic EL OEL carries out the light emission operation with predetermined luminance grade according to the display driver electric current that is provided by display driver circuit DC1.
As shown in Figure 3, the display driver circuit DC1 according to present embodiment has the structure that comprises thin film transistor (TFT) (write control circuit, second switch circuit) Tr11, thin film transistor (TFT) (write control circuit, the 3rd on-off circuit) Tr12, thin film transistor (TFT) (control circuit, first on-off circuit, display driver circuit) Tr13 and capacitor (charge accumulation circuit, capacity cell) Cs particularly.In thin film transistor (TFT) Tr11, gate terminal (control terminal) is connected with sweep trace SL, and drain electrode end and source terminal (first end of conducting channel and second end) are connected respectively to power lead VL and contact point N11, wherein predetermined voltage Vsc are applied to described power lead VL.In thin film transistor (TFT) Tr12, gate terminal (control terminal) is connected with sweep trace SL, and drain electrode end and source terminal (first end of conducting channel and second end) are connected respectively to power lead VL and contact point N12.In thin film transistor (TFT) Tr13, gate terminal (control terminal) is connected with contact point N11, and drain electrode end and source terminal (end and the other end of conducting channel) are connected respectively to power lead VL and contact point (tie point) N12.Capacitor is connected (between the grid and source terminal of thin film transistor (TFT) Tr13) between contact point N11 and the contact point N12.
In addition, in organic EL OEL, anode tap is connected with the contact point N12 of display driver circuit DC1, and applies common electric voltage Vcom to cathode terminal.Here, common electric voltage Vcom is set at arbitrary potential (for example, ground potential GND).With common electric voltage Vcom set for write cycles neutralize not light emission operation in the cycle be set to low level driving voltage Vsc (=Vs) equipotential, in described write cycles, will offer display pixel EM (display driver circuit DC1), and in the described not light emission operation cycle, not allow organic EL (light-emitting component) OEL to carry out light emission operation with the corresponding level signal of video data (grading current Idata).Perhaps, common electric voltage Vcom (for example is set at arbitrary potential, ground potential GND), this arbitrary potential is to be configured to the electromotive force higher than driving voltage Vsc, and in the light emission operation cycle (display operation cycle), become (=Ve) low electromotive force than the driving voltage Vsc that is set to high level, in described light emission operation in the cycle, the display driver electric current offered organic EL (light-emitting component) OEL so that the (light emission operation of Vs≤Vcom≤Ve) is carried out and had the predetermined luminance grade to organic EL (light-emitting component).
Here, capacitor Cs can be the grid that is formed on thin film transistor (TFT) Tr13 and the stray capacitance between the source electrode, and perhaps except stray capacitance, capacity cell can also further be connected in parallel between contact point N11 and contact point N12.
In addition, thin film transistor (TFT) Tr11 is not particularly limited to Tr13.For example, can all utilize single channel-type thin film transistor (TFT) (field effect transistor npn npn) to constitute to Tr13, use n-channel-type amorphous silicon film transistor by making thin film transistor (TFT) Tr11.
In this case, can in relatively easy manufacturing process, make the display driver circuit that comprises amorphous silicon film transistor by using the amorphous silicon manufacturing technology of having generally acknowledged with the stable element characteristic of making peace.Incidentally, in the following description, with the situation that illustrates that thin film transistor (TFT) Tr11 wherein utilizes n-channel-type thin film transistor (TFT) to constitute to Tr13, as the structure example of display driver circuit DC1.
In addition, in above-mentioned situation, organic EL OEL as light-emitting component, is come it is carried out display driver by display driver circuit DC1.Yet the light-emitting component among the present invention is not limited to organic EL OEL.As long as light-emitting component is the current-control type light-emitting component, can use another kind of light-emitting component such as light emitting diode.In addition, in the present embodiment, will illustrate wherein by utilizing display driver circuit DC1 that the current-control type light-emitting component is carried out the situation that display driver comes displays image information.Can be provided for producing and the circuit structure of video data correspondent voltage component the voltage-controlled type light-emitting component carried out the structure of display driver and to be used to change the state of orientation of liquid crystal molecule.
(scanner driver)
Select level sweep signal Vsel by applying to each sweep trace SL according to the scan control signal that is provided by system controller 150, scanner driver 120 is set at selection mode with the display picture element EM of each row.More specifically, under situation about regularly moving, the sweep trace SL of execution in each row applies the operation of sweep signal Vsel, overlaps each other to prevent to operate on the time, thereby sequentially sets each display pixel EM that goes for selection mode.
Here, for example as shown in Figure 2, scanner driver 120 has the structure that comprises known shift register 121 and output circuit unit (output buffer) 122.Shift register 121 is according to scan clock signal SCK and the scanning start signal SST as the scan control signal that are provided by described system controller 150 subsequently, sequentially export with each row in the corresponding shift signal of sweep trace SL.Output circuit unit 122 will convert prearranged signals level (conduction level) signal to from the shift signal of shift register 121 outputs and output to sweep trace SL with the signal that will be changed as sweep signal Vsel according to the output control signal SOE as scan control signal that is provided by system controller 150.
(power supply driver)
Power supply driver 130 is according to the power control signal that is provided by system controller 150, only light emission operation in the cycle for the display pixel EM in each row with high level driving voltage (first voltage) Vsc (=Ve) be applied to power lead VL in this row, and in other operating cycle that is different from light emission operation (display operation) cycle (dark period (non-display operation) cycle), apply low level driving voltage (second voltage) Vsc (=Vs).In this case, the operation that applies low level driving voltage Vsc becomes and is equal to the operation that stops to provide to display pixel EM (display driver circuit DC1) driving voltage Vsc basically.
For example, as shown in Figure 2, power supply driver 130 has the structure that comprises as known shift register 130 in the above-mentioned scanner driver 120 and output circuit unit 132.Shift register 130 according to by system controller 150 as clock signal VCK and start signal VST that power control signal provides, sequentially export with each row in the corresponding shift signal of power lead VL.Output circuit unit 132 converts shift signal to predetermined voltage level (magnitude of voltage Ve, Vs), according to the output control signal VOE that provides as power control signal the signal of being changed is outputed to power lead VL as driving voltage Vsc.
(data driver)
Fig. 4 illustrates the schematic block diagram that can be applied to according to an example of the data driver of the display device of present embodiment.
Incidentally, the inner structure of data driver shown in Figure 4 only illustrates as an example, wherein can produce the grading current that has with the corresponding current value of video data, and the invention is not restricted to this.
Usually, as illustrated in fig. 1 and 2, at predetermined instant for delegation's part, data driver 140 is according to the data controlling signal that is provided by system controller 150, sequentially takes out and keep comprising the video data (brightness degree data) of the digital signal that is provided by described shows signal generation circuit 160 subsequently.Then, data driver 140 produces the grading current Idata that has with the corresponding current value of grade point of video data, and grading current Idata is offered the display pixel EM of delegation that is set at selection mode in write cycle time via data line DL simultaneously.
Particularly, Fig. 5 as described later is described, can use the data driver 140 with a kind of like this structure, this structure comprises shift-register circuit 41, data register circuit 42, data latches circuit 43, D/A converter 44 and electric current and voltage conversion and grading current supply circuit 45.Shift-register circuit 41 is sequentially exported shift signal according to the data controlling signal that is provided by system controller 150 (shift clock signal CLK, sampling start signal STR).Data register circuit 42 sequentially takes out the video data D0 of the delegation's part that is provided by shows signal generation circuit 160 to Dm.Data latches circuit 43 keeps the video data D0 of delegation's part of being taken out by data register circuit 42 to Dm according to data controlling signal (data latch signal STB).D/A converter 44 converts the video data D0 that is kept to predetermined analog signal voltage (voltage gradation Vpix) to Dm.Electric current and voltage conversion and grading current supply circuit 45 at a time produce and are converted into the corresponding grading current Idata of video data of analog signal voltage according to the data controlling signal (output enable signal OE) that is provided by system controller 150, simultaneously grading current Idata is outputed to the data line DL in being listed as accordingly with video data.
(system controller)
System controller 150 is by the scan control signal, power control signal and the data controlling signal that produce and the output of each in scanner driver 120, power supply driver 130 and data driver 140 conduct is used for the timing controling signal of control operation state at least, in the predetermined instant function driver each, and generation and output scanning signal Vsel and have predetermined voltage level driving voltage Vsc and with the corresponding level signal of video data (grading current Idata).Then, system controller is carried out drive controlling operation (not light emission operation, write operation and light emission operation) continuously in each display pixel EM (display driver circuit DC1), control thus to show predetermined picture information according to the picture signal on the display panel 110.
(shows signal generation circuit)
Shows signal generation circuit 160 is provided from the picture signal that is provided by display device 100A outside by for example brightness degree component of signal, and this brightness degree component of signal is offered the data register circuit 42 of data driver 140 for each row part of display panel 110 as the video data that comprises digital signal (brightness degree data).Here, comprise under the situation that is used for regulating such as the timing signal component of the Displaying timer of the image information of television broadcasting signal (composite picture signal) in above-mentioned picture signal, except the function of extracting the brightness degree component of signal, shows signal generation circuit 160 can also have the timing signal of extraction component this component is offered the function of system controller 150.In this case, said system controller 150 produces in the control signal that independently offers scanner driver 120, power supply driver 130 and data driver 140 each according to the timing signal that is provided by shows signal generation circuit 160.
(the drive controlling method of display pixel)
Next, explanation is constituted the drive controlling method of the display pixel of the above-mentioned display panel in the present embodiment.
Fig. 5 illustrates the sequential chart that is applied to according to the drive controlling method in the display pixel of the display device of present embodiment.
Fig. 6 A and 6B illustrate according to the not light emission operation in the display pixel of present embodiment and the concept map of write operation.
Fig. 7 is the concept map that illustrates according to the light emission operation in the display pixel of present embodiment.
As shown in Figure 5, will become write cycles Twrt, light emission operation cycle (display operation cycle) Tem and the non-light emission operation cycle (non-display operation cycle) comprise among predetermined process cycle period (operating cycle) Tcyc according to the drive controlling operation setting among the display pixel EM (display driver circuit DC1) of present embodiment.In write cycles Twrt, the display pixel EM that will be connected with sweep trace SL is set at selection mode, and the grading current Idata that has with the corresponding current value of video data is damaged, and makes thus and video data correspondent voltage component remains between the grid and source electrode that is arranged on the thin film transistor (TFT) Tr13 that is used for display driver on the display driver circuit DC1 (capacitor C s).In light emission operation cycle (display operation cycle) Tem, according to grid that in write cycles Twrt, remains on thin film transistor (TFT) Tr13 and the component of voltage between the source electrode, the display driver electric current that allows to have with the corresponding current value of video data flows to organic EL OEL, thereby has the light emission operation of predetermined luminance grade with execution.Light emission operation cycle (non-display operation cycle) Tnem is not other cycle (cycle that comprises above-mentioned write cycles) that is different from light period.In light emission operation period Tn em not, by stopping to provide driving voltage Vsc (applying low level driving voltage Vsc) to display pixel EM (display driver circuit DC1), stop to provide the display driver electric current to prevent light emission operation (Tcyc 〉=Tem+Tnem, Tnem 〉=Twrt) to organic EL.
Here, as shown in Figure 5, it can be such being set in write cycles Twrt, light emission operation period T em and a non-light emission operation period Tn em among the cycle of treatment period T cyc, promptly do not carrying out write operation and light emission operation continuously after the light emission operation, perhaps can be such, promptly carry out write operation after the end in light emission operation cycle, to carry out light emission operation in any time in light emission operation cycle not (during light emission operation cycle not).
In addition, will set the cycle that pixel portion is required that display pixel EM shows the image information in the middle of have the frame image of (screen) according to a cycle of treatment period T cyc of present embodiment for.Promptly, as described in the display drive method of described display device subsequently, have be expert at and column direction on show on the display panel 110 of a plurality of display pixel EM disposed thereon under the situation of a two field picture that according to two-dimensional approach the display pixel EM that an above-mentioned cycle of treatment period T cyc is set at delegation's part shows the required cycle of delegation's parts of images in the middle of the two field picture.
(non-display operation cycle)
In light emission operation cycle (non-display operation cycle) Tnem not, shown in Fig. 5 and 6A, do not select level (for example by applying from 120 couples of sweep trace SL of scanner driver, low level) sweep signal Vsel, apply low level driving voltage (second voltage) from power supply driver 130 to power lead VL simultaneously, display pixel EM is set at not selection mode.In addition, do not provide grading current Idata to data line DL from data driver 140.
As a result, thin film transistor (TFT) Tr11 and the Tr12 that is arranged on the display driver circuit DC1 is set at cut-off state.Therefore, being electrically connected between the gate terminal (contact point N11, capacitor Cs distolateral) that is arranged so that thin film transistor (TFT) Tr13 and the power lead VL is disconnected, and makes being electrically connected also between source terminal (another of contact point N12, capacitor Cs is distolateral) and the data line DL of thin film transistor (TFT) Tr13 be disconnected.
Here, as illustrated in the display drive method of described display device subsequently, repeat drive controlling operation in each display pixel as a circulation by utilizing a cycle of treatment period T cyc (a frame period Tfr).Therefore, in the initial moment of above-mentioned not light emission operation period Tn em, to remain between the grid and source electrode (two ends of capacitor Cs) of thin film transistor (TFT) Tr13 according to the component of voltage that writes at the video data of cycle of treatment in the cycle, simultaneously thin film transistor (TFT) Tr13 will be set at conducting state than a described Zao one-period of cycle of treatment cycle.
The result, with be applied to power lead VL low level (not being higher than ground potential GND) driving voltage Vsc (=Vs) be applied to the anode tap (contact point N12) of organic EL OEL via thin film transistor (TFT) Tr13, and set the electromotive force that is not higher than same level for the electromotive force Vcom (ground potential GND) of cathode terminal.As a result, reverse biased is applied to organic EL OEL, thereby does not have the display driver electric current to flow and do not carry out not light emission operation (not light emission operation).
(write cycles)
Next, among the write cycles Twrt in being set in above-mentioned not light emission operation period Tn em, shown in Fig. 5 and 6A, apply selection level sweep signal Vsel so that display pixel EM is set at selection mode to sweep trace SL from scanner driver 120.In addition, select constantly synchronously, provide the grading current Idata that has with the corresponding current value of video data (having negative polarity) to data line DL from data driver 140 with this.In addition, in write cycles Twrt, with identical mode in above-mentioned not light emission operation period Tn em, from power supply driver 130 to power lead VL apply low level driving voltage (second voltage) Vsc (=Vs).
Therefore, the thin film transistor (TFT) Tr11 and the Tr12 that are arranged on the display driver circuit DC1 carry out the conducting operation, so that via gate terminal (the contact point N11 of thin film transistor (TFT) Tr11 to thin film transistor (TFT) Tr13; Capacitor Cs's is one distolateral) apply low level driving voltage Vsc, source terminal (the contact point N12 of thin film transistor (TFT) Tr13 simultaneously; Another of capacitor Cs is distolateral) be electrically connected with data line DL via thin film transistor (TFT) Tr12.
Here, offer data line DL owing to will have the grading current Idata of negative polarity current value, so suction action (drawing-in action) takes place, wherein grading current Idata probably from data line DL one effluent to data driver 140, and to source terminal (the contact point N12 of thin film transistor (TFT) Tr13; Another of capacitor Cs is distolateral) apply the voltage level that electromotive force is lower than low level driving voltage Vsc.
By this way, between contact point N11 and N12 (between the grid and source electrode at thin film transistor (TFT) Tr13), produce electric potential difference.As a result, thin film transistor (TFT) Tr13 carries out the conducting operation, and flows to data driver 140 from power lead VL via thin film transistor (TFT) Tr13, contact point N12, thin film transistor (TFT) Tr12 and data line DL with the corresponding write current Ia of grading current Idata.
At this moment, the electric potential difference corresponding charge that will and produce at (between the grid and source electrode at thin film transistor (TFT) Tr13) between contact point N11 and the N12 is accumulated among the capacitor Cs, to be held as component of voltage (being referred to as the electromotive force Vc between the capacitor Cs two ends among Fig. 5).In addition, with low level (being not more than ground potential GND) driving voltage Vsc (=Vs) be applied to power lead VL, and further control write current Ia flowing to data line DL, thereby be applied to the electromotive force Vcom (ground potential GND) that the electromotive force of the anode tap (contact point N12) of organic EL becomes and is lower than cathode terminal.Therefore, OEL applies reverse biased to organic EL, thereby does not have the display driver electric current to flow to organic EL OEL, and does not carry out not light emission operation (not light emission operation).
(display operation cycle)
Next, at write cycles Twrt or among light emission operation (display operation cycle) Tem after comprising the termination of not light emission operation cycle (non-display operation cycle) Tnem of write operation Twrt, shown in Fig. 5 and 7, carry out following operation in the mode similar to above-mentioned not light emission operation period Tn em.Promptly, apply low level sweep signal Vsel so that display pixel EM is set at nonselection mode from scanner driver 120 to sweep trace SL, and with this non-selection synchronously constantly, stop grading current Idata being provided and suspending suction action the grading current Idata from data driver 140.In addition, in light emission operation period T em, from power supply driver 130 to power lead VL apply high level driving voltage (first voltage) Vsc (=Ve).
As a result, the thin film transistor (TFT) Tr11 and the Tr12 that are arranged on the display driver circuit DC1 carry out by operation, so that stop gate terminal (the contact point N11 to thin film transistor (TFT) Tr13; Capacitor Cs's is one distolateral) apply driving voltage Vsc, stop source terminal (contact point N12 simultaneously to thin film transistor (TFT) Tr13; Another of capacitor Cs is distolateral) apply the voltage level that produces by the suction among grading current Idata action.Therefore, the electric charge that will accumulate in above-mentioned write cycles Twrt remains among the capacitor Cs.
By this way, keep in touch between a N11 and the N12 (between the grid and source electrode of thin film transistor (TFT) Tr13; Between the two ends of capacitor Cs) electric potential difference so that thin film transistor (TFT) Tr13 keeps conducting state.And, owing to the driving voltage Vsc that electromotive force is higher than common electric voltage Vcom (ground potential GND) is applied to power lead VL, so be applied to the electromotive force (ground potential) that the electromotive force of the anode tap (contact point N12) of organic EL OEL becomes and is higher than cathode terminal.
Therefore, predetermined display driver current Ib flows to organic EL OEL via thin film transistor (TFT) Tr13 and contact point N12 along forward biased direction from power lead VL, and organic EL OEL is luminous.Here, remain on component of voltage (at the electromotive force Vc between the capacitor Cs two ends) among the capacitor Cs corresponding to allowing to flow to electric potential difference under the situation of thin film transistor (TFT) Tr13 with the corresponding write current Ia of grading current Idata.For this reason, the display driver current Ib that flows to organic EL OEL has the current value identical with above-mentioned write current Ia (Ib ≈ Ia).
Then, in display pixel EM, according to the video data that in write cycles Twrt, writes (grading current Idata) correspondent voltage component, in light emission operation period T em, provide the display driver current Ib continuously via thin film transistor (TFT) Tr13, and as a result of, organic EL OEL continues to carry out brightness degree and the corresponding light emission operation of video data.
By this way, for display pixel EM (display driver circuit DC1) according to present embodiment, make that have grading current Idata with the corresponding specified current flow value of video data (brightness degree) is flowed forcibly in write cycles Twrt, to control the display driver current Ib that allows to flow to organic EL (light-emitting component) OEL between the drain electrode of driving transistors Tr13 and source electrode based on grid and the component of voltage between the source electrode according to the driving transistors of current value maintenance.As a result, can use the drive controlling method of the current class appointing system that is used to carry out light emission operation with predetermined luminance grade.
In addition, for display pixel EM, can realize that the single display driver transistor (thin film transistor (TFT) Tr13) that is arranged on the display driver circuit DC1 on each display pixel EM by means of formation will convert the function (current/voltage-converted function) of voltage level and the function (display driver function) that the display driver electric current DC Ib with predetermined current value is provided to organic EL OEL with the current level of the corresponding grading current Idata of video data to according to present embodiment.Therefore, can in the long time section, realize the characteristics of luminescence of stable expectation, and do not constituted the inconsistent and influence of the variation of passage in time of each transistorized operating characteristic of display driver circuit DC.
(display drive method of display device)
Next, will illustrate according to the display drive method in the display device of present embodiment (operation of displays image information).
Fig. 8 is the sequential chart that illustrates according to an example of the display drive method of display device of the present invention.
In the present embodiment, in order to illustrate, to have to comprise and be arranged on the row of 12 on the display panel (n=12 setting forth present embodiment; The first to the 12 row) structure of display pixel.
In the accompanying drawings, symbol k represents positive integer.The write cycles of representing above-mentioned video data by the dash area shown in the crossing net in each row in the accompanying drawing respectively.Represent the above-mentioned light emission operation cycle respectively by the dash area shown in the round dot.
In display drive method according to the display device 100A of present embodiment, at first, for the display pixel EM (display driver circuit DC1) that is arranged on each row in the display panel 110, carry out not light emission operation, with the display operation (light emission operation that stops organic EL) that stops display pixel EM.Then, sequentially carry out write operation for each row, write and the corresponding grading current Idata of video data with any time in light emission operation period Tn em not (in the present embodiment just in time before light emission operation period Tn em does not finish), sequentially carry out the light emission operation that has with the corresponding predetermined luminance grade of video data, displays image information in a screen portions of display panel 110 thus subsequently.Here, control operation timing by this way is the write cycles Twrt not overlapped (in time) during to such an extent as to each is gone at least.
Especially, originally, as shown in Figure 8, among the not light emission operation period Tn em (being represented by the general introduction printed words in the accompanying drawing) in a frame period Tfr, (for example, i is capable to the particular row of display panel 110 from scanner driver 120; 1≤i≤12) the sweep trace SL in applies non-selection level sweep signal Vsel, is arranged to nonselection mode with the display pixel EM during i is capable.In addition, set the state (wherein stopping to provide the state of grading current Idata) that grading current Idata wherein is not provided to each data line DL from data driver 140.
Then, synchronous constantly with this, from the power lead VL of power supply driver 130 to i is capable apply low level drive (second voltage) Vsc (=Vs) so that do not produce electric potential difference between the drain electrode of the display driver thin film transistor (TFT) Tr13 among the display pixel EM in the i as shown in Fig. 6 A is capable and the source electrode.Therefore, the display driver current Ib does not flow to organic EL OEL via thin film transistor (TFT) Tr13, and the display pixel EM in capable is set at not luminance (carrying out not light emission operation) with i.
Then, as shown in Figure 8, among the write cycles Twrt (representing) in being set in above-mentioned not light emission operation period Tn em by the crossing net in the accompanying drawing, as shown in Figure 5, apply from the sweep trace SL of scanner driver 120 to the i of display panel 110 is capable and to select level sweep signal Vsel, so that the display pixel EM with i in capable is set at selection mode.In addition, in write cycles Twrt, from the power lead VL of power supply driver 130 to i is capable apply low level driving voltage Vsc (=Vs).
Then, select constantly synchronously, provide the grading current Idata that has with i the corresponding current value of video data capable to each data line DL from data driver 140 with this.The result, shown in Fig. 6 B, flow among the display driver circuit DC of each display pixel EM of i in capable with the corresponding write current Ia of grading current Idata, and between the grid of each thin film transistor (TFT) Tr13 and source terminal (capacitor Cs two ends), keep (stored charge) and grading current Idata correspondent voltage component.
Here, in write cycles Twrt, to carry out write operation with mode identical in above-mentioned not light emission operation period Tn em.That is, the power lead VL in the i that wherein carries out write operation is capable apply low level driving voltage Vsc (=Vs), do not produce electric potential difference between the drain electrode of the display driver thin film transistor (TFT) Tr13 in each display pixel EM and the source electrode thus.For this reason, do not have the display driver current Ib to flow to organic EL OEL via thin film transistor (TFT) Tr13, the display pixel EM in capable is set at not luminance (carrying out not light emission operation) with i thus.
For the display pixel EM that is arranged on the display panel 110, the timing that is used for each row is moved, and sequentially carries out the not light emission operation that comprises write operation.Especially, the write operation of sequentially carrying out in each row makes that operation is not overlapping in time.
Then, as shown in Figure 8, in light emission operation (by the round dot shadow representation in the accompanying drawing) as shown in Figure 5, from scanner driver 120 to wherein not the sweep trace SL of the i that stopped of light emission operation period Tn em capable apply non-selection level sweep signal Vsel, the display pixel EM in capable sets nonselection mode for i thus.In addition, stop to provide grading current Idata to each data line DL by data driver 140.
Then, synchronous constantly with this, from the power lead VL of power supply driver 130 to i is capable apply high level driving voltage (first voltage) Vsc (=Vs), so that produce electric potential difference between the drain electrode of the display driver thin film transistor (TFT) Tr13 among each the display pixel EM as shown in Figure 7, in i is capable and the source electrode.Therefore, according to the component of voltage that is charged to (between the grid and source electrode of display driver thin film transistor (TFT) Tr13) among each display pixel EM, provide and the corresponding display driver current Ib of video data (grading current Idata) to organic EL OEL, so that carry out light emission operation with predetermined luminance grade.
For the display pixel EM that is arranged on the display panel 110, be used for the moving of timing of each display pixel of the row that write operation (the not light emission operation that comprises write operation) wherein stopped, order is carried out this light emission operation
That is, for a plurality of display pixel EM that are arranged on two-dimensional approach on the display panel 110, the not light emission operation period Tn em that will have predetermined length is set in a frame period that is used for each row.Therefore, can realize the control of false pulse type display driver, wherein each display pixel EM only carries out brightness degree and the corresponding light emission operation of video data (grading current Idata) in the delimiting period in the middle of a frame period Tfr.Here, the length that is set in not light emission operation cycle among the frame period Tfr or light emission operation cycle for example can be utilized as timing controling signal and set arbitrarily from power control signal, data controlling signal and scan control signal that system controller 150 offers scanner driver 120, power supply driver 130 and data driver 140.
Therefore, in sequential chart shown in Figure 8, can will be set at by means of the ratio of non-display cycle of the above-mentioned not light emission operation (comprising write operation) in a frame period Tfr (black insert than), for example 50%, thus half of the image information (display screen) that shows can be arranged to black display (not showing) on display panel 110.Therefore, the mankind visually, can realize not having the clear visual identity needed about 30% of moving image of smudgy and obfuscation or above black to insert ratio, the result is to show moving image with gratifying image quality.Incidentally, black among the frame period Tfr insert be not limited to than (ratio of non-display cycle) above-mentioned 50%, and above-mentioned 30% or above arbitrary value be gratifying.Yet, 30% or following value be feasible.
In addition, in this case, with with the identical mode of the display drive method shown in the prior art (with reference to Figure 17), can by utilize among the frame period Tfr come sequentially the display image EM in all row (12 row) to display panel 110 to carry out write operation if having time.Therefore, be different from conventional display drive method shown in Figure 27, do not shorten the write cycles Twrt (it is corresponding to view data write cycle time of the prior art) in each row, write the operation and the black display operation of blanking data with realization, and therefore can guarantee the write time that each is gone fully.Can suppress because insufficient display quality that causes that writes of video data worsens, thereby can realize showing with the corresponding suitable grade of video data.
In addition, the timing controlled that this makes it possible to allow to types of signals makes it possible to suppress the generation of the faulty operation of display device thus.
Incidentally, in the present embodiment, shown in the sequential chart of Fig. 8,, will set forth a kind of situation, wherein in a frame period Tfr, carry out the not light emission operation (non-display operation) that comprises write cycles, carry out light emission operation (display operation) subsequently in order to illustrate.Even execution has the light emission operation of predetermined length, carries out under the situation of light emission operation not then after the write operation of carrying out the light emission operation (display operation of display pixel E) be not attended by organic EL OEL, control operation also is substantially the same.
Second embodiment
Next, will illustrate with reference to the accompanying drawings according to the display device of present embodiment and second embodiment of display drive method thereof.
Fig. 9 is the schematic block diagram that illustrates according to second embodiment of display device of the present invention.
Figure 10 illustrates the structural drawing that is applied to according to the major part of an example of the display panel of the display device of present embodiment and peripheral circuit thereof.
Figure 11 illustrates the circuit structure diagram that is applied to according to an example of the display pixel (display driver circuit) of the display device of present embodiment.
Here, represent by identical or suitable reference marker, and simplification is to its explanation with above-mentioned first embodiment (referring to figs. 1 to 3) components identical.
In above-mentioned first embodiment, as shown in Figure 3, will comprise that the circuit structure of a plurality of single channel-type thin film transistor (TFT)s is shown the display driver circuit DC1 that is arranged on each display pixel EM.In this case, will illustrate and to use manufacturing process easily and the consistent amorphous silicon film transistor of element characteristic (electron motion degree).
Yet, be well known that, in amorphous silicon film transistor, be easy to generate the variations in threshold voltage (Vth skew) that causes by the driving process usually.
The result, under with the situation of amorphous silicon film transistor with the on-off element (thin film transistor (TFT) Tr13) that acts on display driver, because variations in threshold voltage, the current value that offers the display driver current Ib of organic EL OEL does not correspond to video data, and can not carry out the light emission operation (display operation) with suitable brightness degree.As a result, there is the possibility that causes that image quality worsens.
Therefore, in a second embodiment, and among third and fourth embodiment subsequently, provide following structure: in the not light emission operation cycle except that the time of light emission operation (display operation) (non-display operation cycle), the grid and the voltage between the source electrode (the electromotive force Vc between the capacitor Cs two ends) of the display driver on-off element (thin film transistor (TFT) Tr13) of each display pixel EM are made as 0V (not having voltage) or negative voltage (reverse biased), to suppress the variations in threshold voltage of on-off element, wherein said light emission operation causes variations in threshold voltage in an above-mentioned frame period Tfr.
As shown in Figures 9 and 10, display device 100B according to second embodiment, in the same manner as in the first embodiment, comprise display panel 110, scanner driver (scan drive cell) 120, power supply driver (power drives unit) 130, data driver (data-driven unit) 140, system controller (driving control unit) 150 and shows signal generation circuit 160.Display panel 110 have be expert at and column direction on a plurality of display pixel EM of being provided with according to two-dimensional approach.Scanner driver 120 sequentially applies to the sweep trace SL of display panel 110 and selects level sweep signal Vsel, is set at selection mode with the display pixel EM with each row.Power supply driver 130 sequentially to each row in the power lead VL that be arranged in parallel of sweep trace SL apply driving voltage Vsc.Data driver 140 provides and the corresponding level signal of video data (grading current Idata) to display pixel EM via data line DL.System controller 150 produces and exports scan control signal, power control signal, reverse biased control signal and the data controlling signal that is used for carrying out at display panel 110 the predetermined image display operations.Shows signal generation circuit 160 produces video data (brightness degree data) and these data is offered data driver 140 according to the image that provides from the outside.In addition, its structure comprises the reverse biased driver (setting state unit) 170 that is used for applying to the display pixel EM of each row bias voltage signal (setting signal) Vbs with predetermined voltage level.Shows signal generation circuit 160 produces video data (brightness degree data) and this video data is outputed to data driver 140, and is provided for predetermined image information is shown to the timing signal of display panel 110 to system controller 150.
For the display pixel EM in each row, only in the specific period among the light emission operation period Tn em not, according to the bias voltage control signal that is provided by system controller 150, the bias line BL of reverse biased driver 170 in this row applies bias voltage signal Vbs.Then, reverse biased driver 170 is in the not light emission operation period Tn em except that write cycles Twrt, and the display driver on-off element that (by apply 0V (no-voltage) or reverse biased between the grid of thin film transistor (TFT) Tr13 and source electrode) will be arranged on each display pixel EM (display driver circuit DC2) is set at no electric field status or reverse bias condition (particular bias voltage state).
Here, for example as shown in figure 10, as in above-mentioned scanner driver 120 and the power supply driver 130, reverse biased driver 170 comprises known shift register 171 and output circuit unit 172.Clock signal BCK and start signal BST that shift register 171 bases are provided by system controller 150 as bias voltage control signal, the corresponding shift signal of bias line BL during output is gone with each.Output circuit unit 172 converts shift signal to predetermined voltage level according to the output control signal that provides as bias voltage control signal, so that shift signal is outputed to each bias line BL as bias voltage signal Vbs.
System controller 150 produces as the bias voltage control signal of the timing controling signal that is used for the control operation state and with it and outputs to reverse biased driver 170, to operate the reverse biased driver 170 except that the scanner driver 120 shown in first embodiment, power supply driver 130 and data driver 140 at predetermined instant.The result, carry out control (display driver of described display device control subsequently), be used to produce sweep signal Vsel and have predetermined voltage level driving voltage Vsc, with corresponding level signal of video data (grading current Idata) and bias voltage signal Vbs, they being outputed to display panel 110, and be used for carrying out drive controlling operation (not light emission operation, reverse biased setting operation, write operation and light emission operation) continuously to show predetermined picture information based on the picture signal on the display panel 110 at each display pixel EM.
In addition, for example as shown in figure 11, with the identical mode of structure shown in above-mentioned first embodiment, be arranged on according to the display pixel EM on the display panel 110 of present embodiment and comprise display driver circuit DC2 and organic EL (light-emitting component) OEL.Display driver circuit DC2 takes out with the corresponding level signal of video data (grading current Idata) and produces the display driver electric current.Organic EL OEL carries out the light emission operation with predetermined luminance grade according to the display driver electric current.Especially, has the structure that also comprises thin film transistor (TFT) (bias control circuit, the 4th on-off circuit) Tr14 except that the thin film transistor (TFT) Tr11 shown in first embodiment to Tr13 and the capacitor Cs especially to the display driver circuit DC2 that the display pixel EM according to present embodiment applies.Thin film transistor (TFT) Tr14 has the gate terminal (control terminal) that is connected with bias line BL, and have respectively with sweep trace SL be connected with contact point N11 drain electrode end and source terminal (end and the other end of conducting channel).
Here, as mentioned above, make amorphous silicon film transistor simple and that element characteristic (electron motion degree etc.) is consistent by application and construct thin film transistor (TFT) Tr11 to Tr14.
Next, explanation is applied to drive controlling method according to the display pixel of the display panel of present embodiment.
Figure 12 illustrates the sequential chart that is applied to according to the drive controlling method (reverse biased setting operation, non-light emission operation, write operation and light emission operation) in the display pixel of the display device of present embodiment.
Figure 13 A and 13B are the reverse biased setting operation in the display pixel (display driver circuit) that illustrates according to present embodiment and the concept map of non-light emission operation.
Figure 14 A and 14B are the write operation in the display pixel (display driver circuit) that illustrates according to present embodiment and the concept map of light emission operation.
Here, with the explanation of omitting to the drive controlling operation identical with above-mentioned first embodiment.As shown in figure 12, to be in a predetermined cycle of treatment period T cyc (for example, a frame period Tfr), to comprise not light emission operation cycle (non-display operation cycle) Tnem, reverse biased setting cycle Tbs, write cycles Twrt and light emission operation cycle (display operation cycle) Tem according to the drive controlling operating and setting among the display pixel EM (display driver circuit DC2) of present embodiment.In light emission operation period Tn em not, stop to provide drive current Vsc (low level driving voltage (second voltage) Vsc is provided) to display pixel EM (display driver circuit DC2), stop thus providing display driver electric current Vsc, to prevent light emission operation to organic EL OEL.Do not carrying out reverse biased setting cycle Tbs among the light emission operation period Tn em.In reverse biased setting cycle Tbs, apply bias voltage signal Vbs via bias line BL and discharge, set no electric field status or the reverse bias condition that wherein applies 0V (no-voltage) or reverse biased thus will remain on the electric charge that (being present in) be arranged on (in capacitor Cs) between the grid and source electrode of the display driver thin film transistor (TFT) Tr13 on the display driver circuit DC2.Do not carrying out write cycles Twrt among the light emission operation period Tn em.In write cycles Twrt, the display pixel EM that will be connected with sweep trace SL is set at selection mode so that the grading current Idata that has with the corresponding current value of video data to be provided, and (in capacitor Cs) keeps and video data correspondent voltage component between the grid and source electrode that are arranged on the display driver thin film transistor (TFT) Tr13 on the display driver circuit DC2 thus.In light emission operation period T em, according to grid that in write cycles Twrt, remains on thin film transistor (TFT) Tr13 and the component of voltage between the source electrode, the display driver current Ib that allows to have with the corresponding current value of video data flows among the organic EL OEL, carry out light emission operation with predetermined luminance grade (Tcyc 〉=Tem+Tnem, Tnem 〉=Tbs+Twrt) thus.
Here, as shown in figure 12, the reverse biased setting cycle Tbs and the write cycles Twrt that can in the zero-time of light emission operation period Tn em not and termination time are set in light emission operation period Tn em not, set.Perhaps, reverse biased setting cycle Tbs and write cycles Twrt can be arranged to and carry out reverse biased setting operation and write operation in any time in light emission operation cycle not (in light emission operation not among the cycle).
(not light emission operation cycle)
At first, in light emission operation period Tn em not, shown in Figure 12 and 13A, do not select level sweep signal Vsel that display pixel EM is set at not selection mode by applying to sweep trace SL, apply low level driving voltage (first voltage) Vsc from power supply driver 130 to power lead VL simultaneously from scanner driver 120.In addition, do not provide grading current Idata to data line DL from data driver 140.
As a result, thin film transistor (TFT) Tr11 and the Tr12 that is arranged on the display driver circuit DC2 is set at cut-off state.Therefore, set up a kind of state, under this state, disconnected gate terminal (the contact point N11 of thin film transistor (TFT) Tr13; Capacitor Cs's is one distolateral) with power lead VL between be electrically connected, also disconnect source terminal (the contact point N12 of thin film transistor (TFT) Tr13 simultaneously; Another of capacitor Cs is distolateral) with data line DL between be electrically connected.Incidentally, be not different from other cycle of described subsequently reverse biased setting cycle Tbs among the light emission operation period Tn em, apply low level bias voltage signal Vsb from reverse biased driver 170 to bias line BL, so that thin film transistor (TFT) Tr14 is set at cut-off state.As a result, with gate terminal (the contact point N11 of thin film transistor (TFT) Tr13; Capacitor Cs's is one distolateral) with sweep trace SL between be electrically connected and be set at off-state.
Here, with to the similar mode of non-display operation cycle shown in above-mentioned first embodiment, repeat drive controlling operation in each display pixel by using a cycle of treatment period T cyc (a frame period Tfr) as a circulation.Therefore, a kind of state is set, under this state, to remain on according to the component of voltage that writes at the video data of a cycle of treatment in the cycle in the zero-time of above-mentioned not light emission operation period Tn em between the source electrode and grid of thin film transistor (TFT) Tr13 (in capacitor Cs), and thin film transistor (TFT) Tr13 will be set at conducting state than a described Zao one-period of cycle of treatment cycle.
For this reason, with be applied to power lead VL low level (not being higher than ground potential GND) driving voltage Vsc (=Vs) be applied to the anode tap (contact point N12) of organic EL OEL via thin film transistor (TFT) Tr13, with respect to the electromotive force Vcom (ground potential GND) of cathode terminal, set the electromotive force that is not higher than same level thus.As a result, OEL applies reverse biased to organic EL, so that there is not the display driver electric current to flow to organic EL OEL, and does not carry out light emission operation (not light emission operation).
(reverse biased setting cycle)
Then, among the reverse biased setting cycle Tbs in being set in above-mentioned not light emission operation period Tn em, apply high level bias voltage signal Vbs from reverse biased driver 170 to bias line BL, shown in Figure 12 and 13A.
Therefore, the thin film transistor (TFT) Tr14 that is arranged on the display driver circuit DC2 carries out the conducting operation, and the voltage level that is set at the sweep signal Vsel that wherein will be set at non-selection level (Vsn) thus is applied to gate terminal (the contact point N11 of thin film transistor (TFT) Tr13; Capacitor Cs's is one distolateral) state.As a result, (producing electric potential difference between=Vsn) voltage level and the contact point N12 based on above-mentioned non-selection level sweep signal Vsel.
Here, as mentioned above, to remain among the capacitor Cs according to the component of voltage that writes at the video data of a cycle of treatment in the cycle in the zero-time of light emission operation period Tn em not, and thin film transistor (TFT) Tr13 will be set at conducting state than Zao one-period of described cycle of treatment cycle.The result, carry out under the situation of reverse biased setting operation in zero-time as shown in figure 12 at light emission operation period Tn em not, be applied to power lead VL driving voltage Vsc (=Vs) be applied to contact point N12 (another of capacitor Cs is distolateral) via thin film transistor (TFT) Tr13.
Therefore, with non-selection level sweep signal Vsel (=Vsn) and low level driving voltage Vsc (=poor (Vsn-Vs) between Vs) is applied to and remains between the grid of thin film transistor (TFT) Tr13 and the source electrode (two ends of capacitor Cs) (being referred to as the electromotive force Vc between the capacitor Cs two ends in Figure 12 and 13B).Here, (=Vs) level can be made as 0V (no electric field status) or reverse bias condition with grid and the electric potential difference between the source electrode (the voltage Vc between the capacitor Cs two ends) that is applied to thin film transistor (TFT) Tr13 thus to be arranged to be equal to or less than low level driving voltage Vsc to the voltage level of the non-selection level of major general sweep signal Vsel.
Incidentally, carry out under the situation of reverse biased setting operation at the initial time of light emission operation period Tn em not, above-mentioned reverse biased (Vsn-Vs) is remained between the grid and source electrode (two ends of capacitor Cs) of thin film transistor (TFT) Tr13, and do not keeping no electric field status or reverse bias condition continuously among the light emission operation period Tn em.
As a result, thin film transistor (TFT) Tr13 being controlled to non-fault ground carries out by operation.Therefore, the electromotive force that is applied to the anode tap (contact point N12) of organic EL OEL is arranged to be equal to or less than the level of the electromotive force Vcom (ground potential GND) of cathode terminal, and reverse biased is applied to organic EL, so that there is not the display driver electric current to flow to organic EL OEL, and do not carry out light emission operation (not light emission operation).
(write cycles)
Then, among the write cycles Twrt in being set in above-mentioned not light emission operation period Tn em, shown in Figure 12 and 14A, apply selection level sweep signal Vsel from scanner driver 120 to sweep trace SL, so that display pixel EM is set at selection mode, select constantly synchronously with this simultaneously, provide the grading current Idata that has with the corresponding current value of video data (negative polarity) to data line DL from data driver 140.In addition, in write cycles Twrt, with with identical mode in above-mentioned not light emission operation period Tn em, from power supply driver 130 to power lead VL apply low level driving voltage (second voltage) Vsc (=Va), and apply low level bias voltage signal Vbs to bias line BL from reverse biased driver 170.
As a result, the thin film transistor (TFT) Tr14 that is arranged on the display driver circuit DC2 is set at cut-off state, thus with gate terminal (the contact point N11 of thin film transistor (TFT) Tr13; Capacitor Cs's is one distolateral) with sweep trace SL between be electrically connected and be set at off-state.In addition, thin film transistor (TFT) Tr11 operates to carry out conducting with mode identical in the write cycles shown in above-mentioned first embodiment to Tr13, so that flow to data driver 140 from power lead VL via thin film transistor (TFT) Tr13, contact point N12, thin film transistor (TFT) Tr12 and data line DL with the corresponding write current Ia of grading current Idata.
Therefore, and be accumulated between the grid and source electrode (two ends of capacitor Cs) of thin film transistor (TFT) Tr13, and remain component of voltage Vdata (in Figure 12, being referred to as the electromotive force Vc between the capacitor Cs two ends) by the electric potential difference corresponding charge that write current Ia produces.In addition, reverse biased is applied to organic EL OEL, so that do not have the display driver electric current to flow and do not carry out light emission operation (not light emission operation) in this moment.
(light emission operation cycle)
Then, in write cycles Twrt, or among the light emission operation period T em after the not light emission operation cycle that comprises write cycles Twrt stops, shown in Figure 12 and 14B, with with identical mode in light emission operation period Tn em not, apply low level sweep signal Vsel so that display pixel EM is set at nonselection mode from scanner driver 120 to sweep trace SL, synchronous constantly with this non-selection simultaneously, stop to provide grading current Idata, and suspend the operation of suction grading current Idata from data driver 140.In addition, with identical mode in light emission operation period Tn em not, apply low level bias voltage signal Vbs from reverse biased driver 170 to bias line BL.On the other hand, in this write cycles Twrt, from power supply driver 130 to power lead VL apply high level driving voltage (first voltage) Vsc (=Ve).
The result, thin film transistor (TFT) Tr11, the Tr12 and the Tr14 that are arranged on the display driver circuit DC2 carry out by operation, so that the electric charge (component of voltage Vdata) that will accumulate in above-mentioned write cycles Twrt remains among the capacitor Cs, and thin film transistor (TFT) Tr13 keeps the conducting operation.In addition, when with high level driving voltage Vsc (=when Ve) being applied to power lead VL, the electromotive force (ground potential) that the electromotive force of the anode tap of organic EL OEL (contact point N12) becomes and is higher than cathode terminal.
As a result, Yu Ding display driver current Ib (≈ Ia) flows to organic EL OEL via thin film transistor (TFT) Tr13 and contact point N12 along forward biased direction from power lead VL.In light emission operation period T em, organic EL OEL proceeds brightness degree and the corresponding light emission operation of video data (grading current Idata certificate).
Here, will specify variations in threshold voltage depression effect (Vth side-play amount depression effect) by means of display pixel with foregoing circuit structure (display driver circuit) and display driver control method thereof.
Figure 15 is the curve map that test findings is shown, and it is illustrated in according to the on-off element (thin film transistor (TFT)) that will be used for display driver in the display pixel of present embodiment and is set at variations in threshold voltage amount under the situation of reverse bias condition.Here, an example of measurement result is shown, wherein allowing n-channel-type amorphous silicon film transistor execution conducting to operate under the situation of (representing) continuously by the dotted line in the accompanying drawing as the display driver on-off element, and only in the driving operating cycle 1/5 on-off element is being set under the reverse bias condition situation of (being represented by the solid line in the accompanying drawing), is measuring the variation tendency of threshold voltage variation amount with respect to the passage of time.
As shown in figure 15, applying continuously to thin film transistor (TFT) under the situation of forward bias, illustrate variations in threshold voltage amount (Vth drift value) pass in time (transverse axis) significantly increase (250 hours in the past after about 2V) trend, shown in the dotted line in the accompanying drawing.By contrast, in limiting time, apply under the situation of reverse biased to thin film transistor (TFT), be clearly shown a kind of like this trend, passage (transverse axis) with respect to the time, the variations in threshold voltage amount is subjected to suppressing greatly (about 0.6V after past 250 hours), shown in the solid line in the accompanying drawing.
Think that this variations in threshold voltage depression effect (Vth side-play amount depression effect) is caused by the release that is trapped in the electric charge in the nitride film, wherein by in the delimiting period that drives in the operating cycle, utilizing being provided with of reverse bias condition that electric charge is incorporated in the nitride film that constitutes gate insulating film in more shallow relatively zone, and be incorporated in the dark zone and in the component structure of amorphous silicon film transistor and be set at reverse bias condition by suppressing electric charge, carry out the release of above-mentioned electric charge.
As a result, even amorphous silicon film transistor is used as the display driver on-off element that is arranged on each display pixel EM (display driver circuit DC2), also can suppress the changes of threshold (Vth skew) that causes by the driving process.Therefore, the display driver current Ib that has with the corresponding current value of video data can be offered organic EL OEL and can carry out the light emission operation (display operation) with suitable brightness degree, make it possible to improve the quality of display image thus.
The display drive method of＜display device 〉
Next, will illustrate according to the display drive method in the display device of present embodiment (operation of displays image information).
Figure 16 is the sequential chart that illustrates according to an example of the display drive method of display device of the present invention.Here, with the explanation of simplifying for the control method identical with above-mentioned first embodiment.The reverse biased cycle of above-mentioned video data is shown respectively by the dash area shown in the parallax in each row among Figure 16 in addition.
In display drive method according to the display device 100B of present embodiment, at first, for the display pixel EM (display driver circuit DC2) that is arranged on each row on the display panel 110, carry out the not light emission operation of the display operation (preventing the light emission operation of organic EL OEL) that prevents display pixel EM.Then, sequentially carry out the reverse biased setting operation, be used for any time of light emission operation period Tn em not (in the present embodiment with the start-up phase of light emission operation period Tn em not with the moment) apply reverse biased to the display driver on-off element (thin film transistor (TFT) Tr13) that is arranged on each display pixel EM (display driver circuit DC2).Any time among not light emission operation period Tn ems (in the present embodiment, in the termination of not light emission operation period Tn em constantly), each row sequentially carried out the write operation that write with video data corresponding grading current Idata thereafter.Subsequently, sequentially carry out the light emission operation with the corresponding predetermined luminance grade of video data, show the image information in the screen part of display panel 110 thus.Here, the write cycles not overlapped (in time) in regularly feasible each row at least of control operation.
Especially, when beginning, as shown in figure 16, with a frame period Tfr in the reverse biased setting cycle Tbs (representing) of initial moment synchronization settings of not light emission operation period Tn em by the parallax in the accompanying drawing in, non-selection level sweep signal Vsel is applied to the particular row of display panel 110, and (for example, i is capable; 1≤i≤12) the sweep trace SL in is so that the display pixel EM with i in capable is set at nonselection mode, as shown in figure 12.
With this constantly synchronously, with low level driving voltage Vsc (=Vs) be applied to the power lead VL of i in capable, the bias line BL in i is capable applies bias voltage signal Vbs simultaneously.As a result, shown in Figure 13 B, reverse biased is applied between the drain electrode and source electrode of the display driver thin film transistor (TFT) Tr13 among the display pixel EM of i in capable (reverse biased setting operation).Therefore, thin film transistor (TFT) Tr13 carries out by operation so that there is not the display driver current Ib to flow to organic EL OEL, and with i the display pixel EM in capable is set at not luminance (carrying out not light emission operation).
In addition, among the not light emission operation period Tn em (representing) after reverse biased setting cycle Tbs stops, in above-mentioned reverse biased setting operation, keep being applied to the drain electrode of thin film transistor (TFT) Tr13 and the reverse biased between the source electrode by the general introduction printed words in the accompanying drawing.As a result, thin film transistor (TFT) Tr13 remain off state does not have display driver current direction organic EL OEL, and the display pixel EM of i in capable continues not luminance (carrying out not light emission operation).
Then, as shown in figure 16, with the termination of above-mentioned not light emission operation period Tn em constantly among the write cycles Twrt (representing) of synchronization settings by the crossing net in the accompanying drawing, sweep trace SL in i is capable applies and selects level sweep signal Vsel, display pixel EM in capable is set at selection mode with i thus, as shown in figure 12.In addition, to the capable power lead VL of i apply low level driving voltage Vsc (=Vs).
Then, select constantly synchronously, provide the grading current Idata that has with i the corresponding current value of video data in capable to each bar data line DL with this.As a result, shown in Figure 14 A, will and grading current Idata correspondent voltage component keep between the grid and source electrode (two ends of capacitor Cs) of thin film transistor (TFT) Tr13 of (stored charge) each display pixel EM (display driver circuit DC2) in i is capable.
For the display pixel EM that is arranged on the display panel 110, the timing that is used for each row is moved, and sequentially carries out the not light emission operation that comprises this write operation.Especially, come sequentially to carry out the write operation of each row by this way, to such an extent as to write operation is not overlapped in time.
Then, as shown in figure 16, in light emission operation (by the some shadow representation in the accompanying drawing), the display pixel EM with i in capable is set at nonselection mode, stops simultaneously providing grading current Idata to each data line DL, as shown in figure 16.
Then, with this constantly synchronously, with high level driving voltage Vsc (=Ve) be applied to the power lead VL of i in capable.The result, as shown in Figure 14B, according to the component of voltage that is charged to (between the grid and source electrode of display driver thin film transistor (TFT) Tr13) among each display pixel EM, to show that accordingly current Ib offers organic EL OEL via thin film transistor (TFT) Tr13 with video data (grading current Idata), so that carry out light emission operation with predetermined luminance grade.
Utilization is used for the moving of timing of each display pixel EM of delegation, and sequentially carries out this light emission operation, to being arranged on display pixel EM on the display panel 110 and the above-mentioned write operation of its execution not light emission operation of write operation (or comprise).
That is, for a plurality of display pixel EM that are arranged on according to two-dimensional approach on the display panel 110, the not light emission operation period Tn em that will have predetermined length is set in a frame period Tfr who is used for each row.Therefore, can realize the control of false pulse type display driver, wherein each display pixel EM only carries out brightness degree and the corresponding light emission operation of video data (grading current Idata) in the delimiting period in the middle of a frame period Tfr.As a result, can clearly illustrate moving image, and not have smudgy and obfuscation.
In this case, with the identical mode of the display drive method shown in the prior art (with reference to Figure 26), by utilizing the whole time of a frame period Tfr, the display pixel in all row (12 row) of display panel 110 is sequentially carried out write operation.Therefore, in each row, do not shorten write cycles Twrt, and can guarantee the write time fully.In addition, by suppressing the deterioration that writes insufficient display quality that causes, realize showing with the corresponding suitable grade of video data owing to video data.
In addition, in light emission operation period Tn em not, reverse biased is applied to the on-off element that is used for display driver (thin film transistor (TFT) Tr13) that is arranged on each display pixel EM, so that on-off element can be set at reverse bias condition.The result, even amorphous silicon film transistor is being used as under the situation of above-mentioned on-off element, also can suppress variations in threshold voltage (Vth skew) widely, and allow organic EL OEL to carry out the light emission operation that has with the corresponding appropriate brightness grade of video data.
The 3rd embodiment
Next, with the display device and the display drive method thereof that illustrate with reference to the accompanying drawings according to the 3rd embodiment.
Figure 17 illustrates the structural drawing that is applied to according to the major part of an example of the display panel of the display device of the 3rd embodiment.
Figure 18 illustrates the structural drawing that is applied to according to the major part of an example of the peripheral circuit of the display panel of the display device of the 3rd embodiment.
With with mode identical under the situation of second embodiment, the 3rd embodiment has following structure: the grid and the voltage between the source electrode of the display driver on-off element of each display pixel EM are made as 0V (no-voltage) or negative voltage (reverse biased), to suppress the variations in threshold voltage of on-off element in the not light emission operation cycle (non-display operation cycle) that is different from light emission operation (display operation) in a frame period.
Shown in Figure 17 and 18, in the mode identical, will be configured to comprise display panel 110, scanner driver (scan drive cell) 120, power supply driver (power drives unit) 130, reverse biased driver (setting state unit) 170 and data driver (data-driven unit) 140 according to the display device 100C of the 3rd embodiment with second embodiment.Display panel 110 have be expert at and column direction on a plurality of display pixel EM disposed thereon.Scanner driver 120 is selected level sweep signal Vsel by sequentially applying to the sweep trace SL of display panel 110, and each display pixel EM that goes is set at selection mode.Power supply driver 130 is connected with parallel many power lead VL of sweep trace SL that are arranged to in each row, and in advance this line is divided into each the capable group that is used for any a plurality of row.Be used for the predetermined instant of each group, the power supply driver 130 sequentially power lead VL in the row in being included in group applies driving voltage Vsc.Reverse biased driver 170 is connected with parallel many reverse biased line BL of sweep trace SL that are arranged to in each row.For in each group of dividing in above-mentioned a plurality of row each, reverse biased line (bias voltage signal line) BL of reverse biased driver 170 in the row of predetermined instant in being included in group applies reverse biased setting signal (setting signal) Vbs, sequentially each display pixel of going is set at reverse bias condition (particular bias voltage state) thus.Data driver 140 provides and the corresponding level signal of video data (grading current Idata) to display pixel EM via each data line DL.
Figure 19 illustrates the structural drawing that is applied to according to the major part of another example of the display panel of the display device of present embodiment and peripheral circuit (scanner driver, power supply driver and reverse biased driver) thereof.
Promptly, as shown in figure 19, construct another example of display panel 110 and peripheral circuit thereof (scanner driver 120, power supply driver 130 and reverse biased driver 170) as follows: for the display pixel EM in each row of display panel 110, independent sweep trace SL, power lead VL and reverse biased line BL are set respectively, and apply independent sweep signal Vsel, driving voltage Vsc and reverse biased setting signal Vbs from scanner driver 120, power supply driver 130 and reverse biased driver 170 to each row respectively.
Here, for power supply driver 130, can use following structure: according to by with row in the shift signal of the corresponding shift register of power lead VL 131 order outputs, the driving voltage Vsc that will have same voltage level in output circuit unit 132 is applied to the independent power lead VL in the row that is included in same group simultaneously, for example, as shown in figure 19, the feasible power lead VL that the driving voltage Vsc with same voltage level can be applied to simultaneously in the row that is included in same group.
Equally, for reverse biased driver 170, can use following structure: according to by with row in the shift signal of the corresponding shift register of reverse biased line BL 141 order outputs, the reverse biased setting signal Vbs that will have same voltage level in output circuit unit 142 is applied to the independent reverse biased line BL in the row that is included in same group simultaneously, for example, as shown in figure 19, the feasible reverse biased line BL that the reverse biased setting signal Vbs with same voltage level can be applied to simultaneously in the row that is included in same group.
The display drive method of＜display device 〉
Next, with the display drive method of explanation according to the display device of the 3rd embodiment.
Figure 20 illustrates the sequential chart that is applied to according to an example of the display drive method of the display device of present embodiment.
Incidentally, in the present embodiment,, provide a kind of 12 row (n=12 that wherein on display panel, are provided with easily with elaboration in order to illustrate; The first to the 12 row) structure of display pixel.In addition, in the accompanying drawings, symbol k represents positive integer, and is represented the reverse biased setting cycle of above-mentioned video data respectively by the dash area shown in the parallax of each row in the accompanying drawing.Represent the write cycles of above-mentioned video data respectively by the dash area shown in the crossing net, and represent the above-mentioned light emission operation cycle respectively by the dash area shown in the point.
In display drive method according to the display device 100C of present embodiment, when beginning, for each the display pixel EM in a plurality of row of dividing in advance about the display pixel EM (display driver circuit DC) that is arranged on each row on the display panel 110 in groups, carry out the not light emission operation (non-display operation) of the display operation (preventing the light emission operation of organic EL OEL) that prevents display pixel EM.Then, any time in light emission operation period Tn em not (constantly in the present embodiment), each row is sequentially carried out the write operation that writes with the corresponding grading current Idata of video data in the termination of light emission operation period Tn em not., allow each display pixel EM in a plurality of row in each group simultaneously carry out the light emission operation that have with video data (grading current) corresponding predetermined luminance grade, so that show an image information of shielding in the part of display panel 110 thereafter.
Particularly, in when beginning, in a plurality of row each, all display pixel EM that are arranged on the display panel 110 are divided in groups in advance.For example, as shown in figure 20, by respectively triplex row display pixel EM being set at one group, for example adjacent first to the third line; The the 4th to the 6th row; The the 7th to the 9th row; And the tenth to the 12 row, 12 the display pixel EM in capable that will constitute display panel 110 are divided into four groups.
Then, among not light emission operation cycle in a frame period Tfr (the non-display operation cycle) Tnem (representing) by the general introduction printed words in the accompanying drawing, from the power lead VL of power supply driver 130 in the multirow of the phase that is included in display panel 110 on the same group apply low level driving voltage (second voltage) Vsc (=Vs).Thus, as among above-mentioned Figure 12 and the 13A, do not produce electric potential difference between the drain electrode of the display driver thin film transistor (TFT) Tr13 among the display pixel EM in all row in being included in this group and the source electrode.As a result, there is not the display driver current Ib to flow to organic EL OEL, so that all the display pixel EM in will organizing are set at not luminance (carrying out not light emission operation) via thin film transistor (TFT) Tr13.
Here, in the not light emission operation period Tn em except that above-mentioned write cycles, apply non-selection level sweep signal Vsel for the sweep trace SL in all row that are included in the group of carrying out light emission operation not from retouching driver 120, simultaneously display pixel EM is set at wherein nonrated electric current I data offers each data line DL from data driver 140 state (wherein stopping to provide the state of grading current Idata).
Then, among the reverse biased setting cycle Tbs (representing by parallax in the accompanying drawings) that any time in light emission operation period Tn em not (synchronous with the initial moment of light emission operation period Tn em not in the present embodiment) is set, reverse biased setting signal Vbs is applied to from reverse biased driver 170 is included in to carry out reverse biased line BL in all row the group of light emission operation not with mode identical shown in above-mentioned Figure 12 and the 13B.As a result, reverse biased is applied between the grid and source electrode of the display driver thin film transistor (TFT) Tr13 among each the display pixel EM that is included in this group (reverse biased setting operation), so that thin film transistor (TFT) Tr13 carries out by operation.
Among the not light emission operation period Tn em after reverse biased setting cycle Tbs stops (representing) by the general introduction printed words in the accompanying drawing, keep being applied to the grid of thin film transistor (TFT) Tr13 and the reverse biased between the source electrode, thin film transistor (TFT) Tr13 remain off state thus by above-mentioned reverse biased setting operation.
Then, as shown in figure 20, by the above-mentioned reverse biased setting operation among the light emission operation period Tn em not under reverse bias condition, in the write cycles Twrt (representing) of any time setting of limiting time after in the past by the crossing net in the accompanying drawing, with with identical mode shown in above-mentioned Figure 12 and the 14A, select level sweep signal Vsel by sequentially applying, the display pixel EM in each row sequentially is set at selection mode from the sweep trace SL of scanner driver 120 to each row of display panel 110.
Then, select constantly synchronously with this, from data driver 140 to each data line DL provide have with each row the grading current Idata of the corresponding current value of video data.Thus, with with identical mode shown in above-mentioned Figure 14 A, flow among the display driver circuit DC of each the display driver pixel EM in this row with the corresponding write current Ia of grading current Idata, so that between the grid of each thin film transistor (TFT) Tr13 and source electrode (two ends of capacitor Cs), keep and grading current Idata correspondent voltage component (Vdata).
For the display pixel EM that is arranged on the display panel 110, utilize moving of timing sequentially to carry out this write cycles Twrt, make for each row write cycles not overlapping in time.Here, in write cycles Twrt, when the display pixel EM in the row that will comprise in same group is set at selection mode, from power supply driver 130 to same group all the row in power lead VL apply low level driving voltage Vsc (=Vs), apply reverse biased to organic EL OEL thus.As a result, do not have electric current to flow to organic EL OEL, and all the display pixel EM in will organizing are set at not luminance (carrying out not light emission operation) from display driver circuit DC.
Then, as shown in figure 20, in light emission operation (display operation cycle) Tem (by the some shadow representation in the accompanying drawing), with identical mode shown in above-mentioned Figure 12 and the 14B, the sweep trace SL from the row of scanner driver 120 to being included in mutually on the same group applies non-selection level sweep signal Vsel.As a result, all the display pixel EM in this group are set at nonselection mode, stop simultaneously providing grading current Idata to each data line DL from data driver 140.
Then, with this constantly synchronously, the power lead VL from the row of power supply driver 130 to being included in this group apply high level driving voltage (first voltage) Vsc (=Ve).The result, with with identical mode shown in above-mentioned Figure 14 B, according to the component of voltage of (between the grid and source electrode of display driver thin film transistor (TFT) Tr13) among each the display pixel EM that remains in this group, will offer organic EL OEL with the corresponding display driver current Ib of video data (grading current Idata).Therefore, carry out light emission operation with predetermined luminance grade.
With relevant for the termination of the above-mentioned write operation of the display pixel EM in all row of this group constantly synchronously (after it stops at once), the display pixel EM that is included in all row in same group is begun this light emission operation simultaneously, and carry out light emission operation continuously, up to next time not till the zero hour of light emission operation (comprising the reverse biased setting operation) of each row relevant for this group.
That is, as present embodiment, the display pixel EM in each row that wherein first the display pixel EM in the third line is set in one group the group carries out not light emission operation and reverse biased setting operation simultaneously.Thereafter, after carrying out write operation according to the order of the display pixel of display pixel in the third line from first row, the display pixel EM in each row carries out light emission operation simultaneously.For being included in the display pixel EM of first in this group in the third line, this light emission operation lasted till till the zero hour of the not light emission operation of next frame period T fr and reverse biased setting operation always.
Hereinafter, utilize mobile execution identical operations regularly as follows: for wherein display pixel EM in the display pixel EM in the 4th to the 6th row, the 7th to the 9th row and the display pixel EM in the tenth to the 12 row being set at each group of one group, the write operation in each row is not overlapping in time.
Therefore, in this display drive method of display device, the not light emission operation period Tn em that will have predetermined length is set at a frame period Tfr who is used for each group, in this group the display pixel in the multirow is set at one group.As a result, can realize the control of false pulse type display driver, wherein carry out the corresponding light emission operation of brightness degree and video data (grading current Idata) in the delimiting period of each display pixel EM in the middle of a frame period Tfr.
Incidentally, can utilize as timing controling signal and offer scan control signal, power control signal, reverse biased control signal and the data controlling signal of scanner driver 120, power supply driver 130, reverse biased driver 170 and data driver 140 from system controller 150, the execution that is arranged on the not light emission operation, reverse biased setting cycle Tbs, write cycles Twrt and the light emission operation period T em that carry out among the frame period Tfr arbitrarily constantly and the execution time (length).
Here, in sequential chart shown in Figure 20, control as follows: will constitute display panel 110 12 the row in display pixel EM be divided into four groups, carried out not light emission operation (comprising the reverse biased setting operation) and light emission operation every a different set of moment simultaneously thus.The result, the ratio of the non-display cycle of utilizing above-mentioned not light emission operation among the one frame period Tfr (black insert than) is made as about 50% so that half of the image information (display screen) that shows can be made as black display (not showing) on display panel 110.
In order to allow clearly to discern moving image and do not have smudgy and obfuscation with the mankind's vision, usually about 30% or above black insert than being preferred.As a result, according to present embodiment, can realize to show the display device of moving image with superior display quality.Incidentally, the black among the frame period Tfr inserts than (ratio of non-display cycle) and is not limited to above-mentioned 50%.The quantity that depends on group can be set black arbitrarily and insert ratio.Especially, expectation black inserts more above-mentioned 30% than being not less than, but 30% or following value also be feasible.
In addition, in the present embodiment, as shown in figure 20, will be described as follows situation:, the display pixel in all row (12 row) of display panel 110 is sequentially carried out write operation by the most of the time (three/two cycles among the frame period Tfr among Figure 20) of utilizing a frame period Tfr.Even will wherein keep the cycle of reverse bias condition to be arranged to relatively short time (for example 1/5th of a frame period Tfr) among the frame period Tfr, also can suppress to be arranged on the variations in threshold voltage (Vth side-play amount) of the on-off element that is used for display driver (thin film transistor (TFT) Tr13) on each display pixel EM widely.As a result, can sequentially carry out write operation to the display pixel EM in all row of display panel 110 by utilizing the most of the time of a frame period Tfr.
In this case, display drive method shown in the image pattern 27 is the same, do not shorten the write cycles Twrt (corresponding to view data write cycle time of the prior art) in each row greatly, with write operation and the black display operation that realizes the blanking data, can guarantee the write time of each row fully, and, can realize and the corresponding suitable grade demonstration of video data by suppressing the deterioration that writes insufficient display quality that causes owing to video data.In addition, the timing controlled that this makes it possible to allow to various signals can suppress the generation of the faulty operation of display device thus.
In addition, can be by in light emission operation period Tn em not, applying reverse biased reverse bias condition be set to being arranged on the on-off element that is used for display driver (thin film transistor (TFT) Tr13) on each display pixel EM.The result, even using under the situation of amorphous silicon film transistor as above-mentioned on-off element, also can organic EL OEL be carried out have and the corresponding suitably light emission operation of brightness degree of video data by suppressing variations in threshold voltage (Vth side-play amount) widely.
In addition, in the present embodiment, set the voltage level of driving voltage Vsc, so that control light emission operation and non-light emission operation for each group.Therefore, shown in Figure 17 and 10, for the single driving voltage Vsc of each group output, and can be with driving voltage Vsc via branch and be arranged on power lead VL in this group and be applied to each display pixel EM in capable simultaneously.In addition, in order to suppress to be arranged on the variations in threshold voltage of the on-off element that is used for display driver (thin film transistor (TFT) Tr13) on each display pixel EM, set the state that applies (apply and stop) of reverse biased setting signal Vsc for each group.Therefore, shown in Figure 17 and 18, to the single reverse biased setting signal Vbs of each group output, so that can be with reverse biased setting signal Vbs via branch and be arranged on reverse biased line BL in this group and be applied to each display pixel EM in capable simultaneously.
Therefore, the quantity that is used in the quantity of the link of transmission driving voltage Vsc between display panel 110 and the power supply driver 130 and be used for transmitting the link of reverse biased setting signal Vbs between display panel 110 and reverse biased driver 170 can be made as and be arranged on the corresponding quantity of quantity (being four in the present embodiment) of the group of display panel 110 at least.As a result, for each power lead VL that goes provides the situation of link to compare with reverse biased line BL, the quantity of link can be reduced greatly, the circuit structure of power supply driver 130 and reverse biased driver 170 can be simplified simultaneously with wherein.
Incidentally, in the present embodiment, shown in sequential chart shown in Figure 20,, will be described below situation: in a frame period Tfr, carry out and comprise that the not light emission operation (non-display operation) of reverse biased setting cycle and write cycles carries out light emission operation (display operation) afterwards in order to illustrate.Control operation is basic identical, for example, have the light emission operation of predetermined length even after the write operation that execution does not have the light emission operation (display operation of display pixel EM) of organic EL OEL to follow, carry out, and thereafter, carry out the not light emission operation that comprises the reverse biased setting operation.
Next, explanation with reference to the accompanying drawings can be applied to second example according to the display drive method of the display device of present embodiment.
Figure 21 is the sequential chart that illustrates according to second example of the display drive method of the display device of present embodiment.
Here, will simplify explanation for the display drive method identical with above-mentioned first embodiment (with reference to Figure 20).
In second example, in a frame period Tfr, carry out following the operation according to the display drive method of the display device 100C of present embodiment.Promptly, to be arranged on the display panel 110 and a plurality of display pixel EM of (continuously) not adjacent one another are are divided into group as one group, display pixel EM for each group, carry out above-mentioned not light emission operation (comprising the reverse biased setting operation) and light emission operation simultaneously, and carry out the operation of sequentially carrying out above-mentioned write operation of moving that is used for the display pixel EM of each row is utilized timing.
Especially, for example as shown in figure 21, by respectively triplex row display pixel EM being set at one group, that is, for example the first, the 5th and the 9th behavior is one group; The second, the 6th and the tenth behavior is one group; Three, the 7th and the 11 behavior is one group; And the 4th, the 8th and the 12 one group of behavior, the display pixel EM that constitutes in 12 row of display panel 110 is divided into four groups.For example, therein the display pixel in the first, the 5th and the 9th row is set in one group the group, carries out not light emission operation and reverse biased setting operation being included in this group all display pixel EM in capable.According to the order of first row, fifth line and nine row display pixel carried out above-mentioned write operation thereafter.After the display pixel EM in the 9th row was finished write operation, the display pixel EM that is included in all row in the row of the first, the 5th and the 9th in this group carried out light emission operation simultaneously.For the display pixel in the first, the 5th and the 9th row, this light emission operation lasted till till the moment of carrying out the not light emission operation (comprise reverse biased setting operation) of next frame in the cycle always.
In addition, in the moment that the write operation of the display pixel EM in the 9th row is finished, carry out not light emission operation and reverse biased setting operation or light emission operation simultaneously in the predetermined moment by this way, to such an extent as to display pixel EM is carried out above-mentioned write operation according to the order that therein display pixel in the second, the 6th and the tenth row is set at second row, the 6th row and the tenth row in one group the group.Hereinafter, therein the 3rd, the 7th and the tenth delegation is set in the group that one group group neutralization is set at the 4th, the 8th and the 12 row one group therein and repeats identical operations.
The result, even utilize the display drive method of this display device, also can with the mode identical according to the display drive method of first example, realize the control of false pulse type display driver, wherein only in the delimiting period of a frame period Tfr who is used for each group, carry out brightness degree and the corresponding light emission operation of video data, in the cycle except that light emission operation, carry out not light emission operation (comprising reverse biased setting operation and write operation) simultaneously.Here, equally in this display drive method, can with utilize not the ratio of the non-display cycle of light emission operation (black insert than) be made as 30% or more than, can realize thus wherein by suppressing the display device that the smudgy of moving image and obfuscation improve sharpness.
In addition, each row for being included in each group can be set at reverse bias condition with the on-off element that is used for display driver (thin film transistor (TFT) Tr13) that is arranged on each display pixel EM.Therefore, can be suppressed at the big variation (Vth side-play amount) of the threshold voltage that causes by the driving process in the amorphous silicon film transistor that is applied to on-off element widely, and allow organic EL OEL execution to have and the corresponding suitably light emission operation of brightness degree of video data.
In addition, equally in this case, suitably set moment of write operation by system controller 150, can sequentially carry out write operation to the display pixel EM in all row (12 row) of display panel 110 by the most of the time of utilizing a frame period Tfr thus.As a result, can guarantee the write time of each row fully, and can suppress because the deterioration that writes insufficient display quality that causes of video data makes it possible to realize show with the corresponding suitable grade of video data thus.
In addition, set the voltage level of driving voltage Vsc and the state that applies of reverse biased setting signal Vbs, so that control light emission operation and non-light emission operation and reverse biased setting operation for each group.Therefore, the quantity of the link between display panel 110 and the power supply driver 130 and the quantity of the link between display panel 110 and the reverse biased driver 170 can be reduced to and the corresponding quantity of above-mentioned group quantity (being four in the present embodiment), make it possible to simplify the circuit structure of power supply driver 130 and reverse biased driver 170 thus.
Incidentally, in display drive method, will be described as follows situation: be divided into four groups by triplex row being set at one group of display pixel EM with formation display panel 110 according to above-mentioned first and second examples.Yet, the invention is not restricted to this.Certainly by suitably increasing and reduce the quantity that its quantity is set group.
The 4th embodiment
Next, with the display device and the display drive method thereof that illustrate with reference to the accompanying drawings according to the 4th embodiment.
＜display device 〉
Figure 22 illustrates the structural drawing that is applied to according to the major part of an example of the display panel of the display device of the 4th embodiment and peripheral circuit thereof.
Here, the parts identical with above-mentioned the 3rd embodiment are by same or analogous symbolic representation, and simplification is to its explanation.
With with the identical mode of the second and the 3rd embodiment, present embodiment has following structure: in the not light emission operation cycle except that the time of light emission operation (display operation) (non-display operation cycle) in a frame period, the grid and the voltage between the source electrode of the display driver on-off element of each display pixel EM are made as 0V (no-voltage) or negative voltage (reverse biased), to suppress the variations in threshold voltage of on-off element.
As shown in figure 22, according to display device 100D of the present invention, with with the identical mode of above-mentioned first embodiment, have the structure that comprises display panel 110, scanner driver 120, power supply driver 130, reverse biased driver 170, data driver 140, system controller 150 and shows signal generation circuit 160.On display panel 110, will be divided into each the group that is used for any a plurality of row according to a plurality of display pixels of two-dimensional approach setting.Sweep trace SL in each row of scanner driver 120 and display panel 110 is connected.Power supply driver 130 with each the row in power lead VL be connected.Reverse biased driver 170 with each the row in reverse biased line BL be connected.Data driver 140 with each row in data line DL be connected.System controller 150 is to above-mentioned each driver output timing controling signal (scan control signal, power control signal, reverse biased control signal and data controlling signal).Shows signal generation circuit 160 produces video data (brightness degree data) and these data is offered data driver 140.Especially, present embodiment has following structure: with single power lead VL branch and be arranged to be used for each row of each group of above-mentioned group in display pixel corresponding, and in addition independent reverse biased line BL is arranged to be included in each group in each display pixel EM in capable corresponding.
Promptly, with with the identical mode of above-mentioned the 3rd embodiment, power supply driver 130 is configured to for the corresponding single driving voltage Vsc of power lead VL in a plurality of row in the output sequentially of each group and each group, with the same in above-mentioned scanner driver 120, reverse biased driver 170 is configured to for the corresponding independent reverse biased setting signal Vbs of reverse biased line BL in each capable a plurality of row of sequentially exporting and be included in each row simultaneously.
As a result, for each group, the driving voltage Vsc that will have a predetermined voltage level is applied to power lead VL in the row that is contained in each group simultaneously from power supply driver 130.Therefore, (under=Vs) the situation, the display pixel EM in all row in this group is set at luminance simultaneously applying low level driving voltage (second voltage) Vsc.On the other hand, (under=Ve) the situation, the display pixel in all row of this group is set at luminance (grade show state) simultaneously applying high level driving voltage (first voltage) Vsc.
In addition, for each the row, with reverse biased setting signal Vbs from bias voltage driver 170 sequentially be applied to be included in each the group each the row in reverse biased line BL.As a result, the display pixel each row sequentially is set at the identical mode of situation of selection mode with utilizing, the display pixel EM in each row sequentially is set to reverse bias condition from the sweep signal Vsel of scanner driver 120 outputs.
The display drive method of＜display device 〉
Next, will illustrate according to the display drive method in the display device of present embodiment (operation of displays image information).
Figure 23 is the sequential chart that illustrates according to first example of the display drive method of the display device of the 4th embodiment.Here, will the drive controlling method of the display pixel shown in above-mentioned first embodiment be described suitably with reference to the accompanying drawings.In addition, simplification is to the explanation of the display drive method identical with above-mentioned the 3rd embodiment.
In first example, in a frame period Tfr, carry out following the operation according to the display drive method of the display device 100D of present embodiment.Promptly, be divided into group with being arranged on display pixel EM in the row of a plurality of adjacent (continuously) on the display panel 110 as a set, display pixel EM to each group carries out above-mentioned not light emission operation and light emission operation simultaneously, and utilizes moving of timing sequentially to carry out reverse biased setting operation and write operation to the display pixel EM of each row.
Especially, in when beginning, with the mode identical according to first example of above-mentioned the 3rd embodiment, in a plurality of row each, all display pixel EM that will be arranged in advance on the display panel 110 divide in groups.For example, as shown in figure 23, by respectively triplex row display pixel EM being set at one group, for example adjacent (continuously) first to the third line, the 4th to the 6th row and the tenth to the 12 row, the display pixel EM that constitutes in 12 row of display panel 110 is divided into four groups.
Then, among the not light emission operation period Tn em (representing) in a frame period Tfr by the general introduction printed words in the accompanying drawing, with single low level driving voltage Vsc (=Vs) be applied to power lead VL in a plurality of row on the same group mutually that are included in display panel 110 via the power lead VL of branch and setting from power supply driver 130.Thus, all the display pixel EM in this group are set at simultaneously not luminance (carrying out not light emission operation).
In this reverse biased setting cycle Tbs (representing) that any time among the light emission operation period Tn em (synchronous with the initial moment of light emission operation period Tn em not in the present embodiment) is not set, utilize the reverse biased line BL that reverse biased setting signal Vbs is applied to the independent layout that is used for each row from reverse biased driver 170 according to the order from first row that moves regularly by the parallax in the accompanying drawing.As a result, reverse biased is applied between the grid and source electrode of the display driver thin film transistor (TFT) Tr13 on the display pixel EM that is arranged in each row, thus, sequentially display pixel EM is set at reverse bias condition.Reverse bias condition of setting for each row last till in described write operation subsequently always will and till video data (grading current Idata) correspondent voltage component Vdata remains between the grid of the thin film transistor (TFT) Tr13 on the display pixel EM that is arranged in each row and the source electrode.
Then, being included among the write cycles Twrt (representing) that reverse biased setting operation in each row in each group any time after stopping sets in above-mentioned not light emission operation period Tn em by the crossing net in the accompanying drawing, with selecting level sweep signal Vsel to set gradually sweep trace SL each row according to order, sequentially the display pixel EM in each row is set at selection mode from first row from scanner driver 120.Select constantly synchronously with this, from the data line DL of data driver 140 to each row provide have with each row in the grading current Idata of the corresponding current value of video data so that carry out write operation be used for and grading current Idata correspondent voltage component Vdata remain between the grid and source electrode of the display driver thin film transistor (TFT) Tr13 on each the display pixel EM that is arranged on this row.
Subsequently, in light emission operation period T em (by the some shadow representation in the accompanying drawing), with single high level driving voltage Vsc (=Vs) be applied to branch and be arranged on power lead VL in each row that is included in the group of write operation that wherein stops each row from power supply driver 130, all the display pixel EM in will organizing thus are set at luminance (execution light emission operation) simultaneously.The light emission operation that each group is carried out last till always begin next time not light emission operation (comprising reverse operation) for each row in this group till.
Hereinafter, by this way to wherein respectively the 4th to the 6th row, the 7th to the 9th row and the tenth being carried out identical operations to each group that is set to 12 row display pixel EM in one group the group, to such an extent as to each row of display panel 110 is utilized moving and sequentially carry out above-mentioned reverse biased setting operation and write operation (not overlapping in time) regularly.As a result, an image information of shielding in the part that shows display panel 110.
Therefore, because can be to realize the control of false pulse type display driver, so the display device that can realize wherein suppressing the smudgy of moving image and obfuscation and improve its sharpness with utilize this display drive method of display device according to the identical mode of the display drive method of above-mentioned first embodiment.
In addition, can with therein by independently to each row carry out cycle that reverse setting operation and write operation keep being arranged on the reverse bias condition between reverse biased setting cycle and the write operation set for in the ranks be certain at interval.Therefore, the feasible amount of suppression unanimity that is arranged on the variations in threshold voltage (Vth skew) of the on-off element that is used for display driver (thin film transistor (TFT) Tr13) on each display pixel EM, and can realize more gratifying image quality by allowing organic EL OEL execution have with the corresponding suitably light emission operation (display operation) of grade of video data.
Next, explanation with reference to the accompanying drawings can be applied to second example according to the display drive method of the display device of present embodiment.
Figure 24 is the sequential chart that illustrates according to second example of the display drive method of the display device of present embodiment.Here, will simplify explanation to the display drive method identical with above-mentioned first example (with reference to Figure 23).
In second example, in a frame period Tfr, carry out following the operation according to the display drive method of the display device 100D of present embodiment.Promptly, to be arranged on the display panel 110 and a plurality of row of (continuously) not adjacent one another are in display pixel EM divide in groups, display pixel EM to each group carries out above-mentioned not light emission operation and light emission operation simultaneously, and utilizes moving of timing sequentially to carry out above-mentioned reverse biased setting operation and write operation to the display pixel EM of each row.
Especially, for example, as shown in figure 24, by triplex row display pixel EM is arranged to one group, as in such a way going of non-conterminous (discontinuous) being provided with in groups: the first, the 5th and the 9th row; The second, the 6th and the tenth row; Three, the 7th and the tenth delegation; And the 4th, the 8th and the 12 row, and the display pixel EM that will be arranged on the display panel 110 is divided into four groups.
Then, for example, display pixel EM with the first, the 5th and the 9th row is set in one group the group therein, the display pixel EM that is included in all row in this group is carried out not light emission operation simultaneously, and then, display pixel EM is carried out the reverse biased setting operation according to the order of first row, fifth line and the tenth row.Thereafter, first row, fifth line and the tenth row are carried out write operation, and the display pixel EM of the 9th row is finished write operation, and then, the display pixel EM during all that are included in the row of the first, the 5th and the tenth in this group are gone carries out light emission operation simultaneously.This light emission operation lasts till till next frame is carried out the moment of light emission operation not to the display pixel EM in the first, the 5th and the 9th row in the cycle always.
In addition, in the moment that the display pixel EM in above-mentioned the 9th row is finished the reverse biased setting operation, therein the display pixel in the second, the 6th and the tenth row is set in one group the group and carries out not light emission operation simultaneously, and display pixel EM is carried out the reverse biased setting operation according to the order of second row, fifth line and the tenth row.In the moment that the display pixel EM in above-mentioned the 9th row is finished write operation, carry out not light emission operation, reverse biased setting operation and write operation by this way in the predetermined moment, display pixel EM is carried out write operation according to the order of second row, the 6th row and the tenth row to such an extent as to therein the display pixel EM in the second, the 6th and the tenth row is set in one group the group.Hereinafter, therein the 3rd, the 7th and the tenth delegation is set in the group that one group group neutralization is set at the 4th, the 8th and the 12 row one group therein and repeats identical operations.
Therefore, utilize this display drive method of display device, with the mode identical according to the display drive method of above-mentioned first example, realize the control of false pulse type display driver, so that can suppress the smudgy of moving image and obfuscation.Simultaneously, setting remains on cycle between each row with reverse bias condition, thus can be so that be arranged on the amount of suppression unanimity of variation (Vth skew) of the threshold voltage of the on-off element that is used for display driver (thin film transistor (TFT) Tr13) on each display pixel EM.

Claims (38)

1. one kind is used to show and the display device of the corresponding image information of video data, comprising:
Display panel, it comprise be arranged on thereon the multi-strip scanning line that is provided with according to line direction with according near a plurality of display pixels each point of crossing of many data lines of column direction setting;
Scan drive cell, its sequentially each bar in described multi-strip scanning line apply sweep signal, and will be set at selection mode with the corresponding described display pixel of the described sweep trace of each bar;
The data-driven unit, it produces and the corresponding level signal of described video data, and this grade signal is offered the described display pixel that is set to described selection mode;
The power drives unit, it provides driving voltage to control the driving condition of each described display pixel to described display pixel; And
Driving control unit, its: (i) the described power drives of control unit is operated in the non-display cycle described display pixel is set at non-display operation state, does not show described video data at display pixel described in the described non-display cycle; And (ii) control described scan drive cell and operate in the described non-display cycle, described display pixel is set at described selection mode.
2. display device according to claim 1, wherein said power drives unit optionally provides as first voltage of described driving voltage and second voltage, described first voltage be used for the corresponding bias state of described level signal under described display pixel is set at the display operation state, and described second voltage is used for described display pixel is set at described non-display operation state.
3. display device according to claim 2, wherein said driving control unit is controlled described power drives unit, described first voltage that provides in display cycle of described video data as described driving voltage is provided with described display pixel therein, and described second voltage as described driving voltage was provided in the described non-display cycle.
4. display device according to claim 1 also comprises:
The setting state unit, its eliminate be set to described display pixel in each row based on described level signal with the corresponding bias state of described video data, and its generation is used for specific bias state is set to the setting signal of described display pixel of each row of described display panel; And
Many bias lines, it is arranged on the described display panel described setting signal is applied to each described display pixel of going of described display panel.
5. display device according to claim 4, wherein said driving control unit are controlled described setting state unit in the part of described non-display cycle described setting signal is offered and the corresponding described bias line of described display pixel.
6. display device according to claim 4, wherein each described display pixel comprises the display driver circuit of the operation of current-control type optical element and this optical element of control, and
Wherein said display driver circuit comprises:
Charge accumulation circuit, it keeps and described level signal correspondent voltage component;
The supply control circuit, it produces the drive current with predetermined current value according to the described component of voltage that remains in the described charge accumulation circuit, and it offers described optical element with this drive current; And
Write control module, it controls the supply status that electric charge is provided to described charge accumulation circuit according to described level signal.
7. display device according to claim 6, wherein said optical element comprises light-emitting component, this light-emitting component is to carry out light emission operation with the corresponding brightness of the value of the described drive current that is applied to it.
8. display device according to claim 7, wherein said data-driven unit comprises the circuit of generation as the grading current of described level signal, and the current value that described grading current has makes described light-emitting component carry out brightness degree and the corresponding light emission operation of described video data.
9. display device according to claim 7, wherein said light-emitting component comprises organic electroluminescent device.
10. display device according to claim 6, wherein said display panel comprise respectively and corresponding many power leads of the row of described display panel, and described driving voltage is offered described power lead, and
Wherein the described supply control circuit of each described display pixel comprises:
Conducting channel, it has first end that is connected with one of described power lead and second end that is connected with described light-emitting component one end, and described display driver electric current flows through from described conducting channel; And
The control terminal that is connected with described charge accumulation circuit.
11. display device according to claim 10, wherein the described write control circuit of each described display pixel comprises:
Conducting channel, it has first end that is connected with one of described data line and second end that is connected with the described control terminal of described control circuit via described charge accumulation circuit; And
The control terminal that is connected with one of described sweep trace.
12. display device according to claim 6, wherein said display driver circuit also comprises bias control circuit, its electric charge that will be accumulated in the described charge accumulation circuit discharges, and applies a kind of in no-voltage and the reverse biased to described supply control circuit.
13. display device according to claim 12, wherein said bias control circuit comprises:
Conducting channel, it has second end that first end that is connected with one of described sweep trace is connected with control terminal with described supply control circuit; And
The control terminal that is connected with one of described bias line.
14. display device according to claim 12, wherein said display driver circuit comprises:
First on-off circuit, it comprises the conducting channel with first end and second end, and described driving voltage is applied to described first end, and described second end is connected to the connection contact point of an end of described optical element;
The second switch circuit, it comprises the control terminal that is connected with a described sweep trace and has first end and the conducting channel of second end, described driving voltage is applied to described first end, the control terminal of described first on-off circuit is connected to described second end;
The 3rd on-off circuit, it comprises the control terminal that is connected with a described sweep trace and has first end and the conducting channel of second end, and described data line is connected to described first end, will connect contact point and be connected to described second end;
Capacity cell, its described control terminal that is connected described first on-off circuit is connected between the contact point with described; And
The 4th on-off circuit, the conducting channel that it comprises the control terminal that is connected with a described bias line and has first end that is connected with a described sweep trace and second end that is connected with the described control terminal of described first on-off circuit,
Wherein said supply control circuit comprises described first on-off circuit,
Wherein said bias control circuit comprises described the 4th on-off circuit, and
Wherein said charge accumulation circuit comprises described capacity cell.
15. display device according to claim 14, each in wherein said first on-off circuit to the, four on-off circuits all comprises amorphous silicon film transistor.
16. display device according to claim 2, wherein the described a plurality of image pixels with described display panel are divided into a plurality of groups, and each group comprises a plurality of row; And
Wherein said driving control unit is controlled described power drives unit, in the display cycle that shows described video data at the described display pixel of operation described first voltage is offered each described display pixel of described group as described driving voltage, and in each described group, simultaneously described display pixel is set at the display operation state.
17. display device according to claim 16, wherein each described a plurality of row of described group comprises a plurality of adjacent row.
18. display device according to claim 16, wherein each described a plurality of row of described group comprises the row of a plurality of separation.
19. display device according to claim 16, wherein said driving control unit is controlled described power drives unit in the described non-display cycle described second voltage is offered each described display pixel of described group as described driving voltage, and in each described group, simultaneously described display pixel is set at described non-display operation state.
20. display device according to claim 19, wherein said display panel comprise and corresponding many power leads of row difference of described display panel, and apply described driving voltage via described power lead,
Wherein described power lead is divided into each described a plurality of row of described group and organizes accordingly, and
Wherein, in each described group, described power drives unit offers described driving voltage each in the described power lead in this group usually, and simultaneously described driving voltage is offered the described display pixel in this group.
21. display device according to claim 16 also comprises:
The setting state unit, its eliminate be set to described display pixel in each row based on described level signal with the corresponding bias state of described video data, and its generation is used for specific bias state is set to the setting signal of described display pixel of each row of described display panel; And
Many bias lines, it is arranged on the described display panel described setting signal is applied to each described display pixel of going of described display panel;
Wherein described many bias lines are divided into some groups, each group comprises and corresponding many bias lines of each described a plurality of row of described group, and
Wherein, in each described group, described setting state unit offers described many bias lines in this group with described setting signal, and simultaneously described setting signal is offered the described a plurality of display pixels in this group.
22. display device according to claim 16 also comprises:
The setting state unit, its eliminate be set to described display pixel in each row based on described level signal with the corresponding bias state of described video data, and its generation is used for specific bias state is set to the setting signal of described display pixel of each row of described display panel; And
Many bias lines, it is arranged on the described display panel described setting signal is applied to each described display pixel of going of described display panel;
Wherein said setting state sequence of unit ground offers described setting signal and corresponding described many bias lines of each described a plurality of row of described group, and in each described group, sequentially described setting signal is offered the described display pixel in the described a plurality of row in this group.
23. control display device with the drive controlling method of demonstration for one kind with the corresponding image information of video data, wherein said display device comprises display panel, this display panel comprise be arranged on thereon the multi-strip scanning line that is provided with according to line direction with according near a plurality of display pixels the point of crossing of many data lines of column direction setting, this method comprises:
Line by line, described display pixel sequentially is set at selection mode;
Line by line, will with the corresponding level signal of described video data sequentially offer be set at described selection mode each the row in described display pixel;
With the corresponding bias state of described level signal under, each described display pixel is set at the display operation state; And
Do not show at described display pixel and in the non-display cycle of described video data described display pixel to be set at non-display operation state;
Wherein described display pixel is set at described selection mode, is set simultaneously and is described non-display operation state.
24. drive controlling method according to claim 23 wherein is set at each display pixel described display operation state and comprises first voltage that is provided for described display pixel is set at forward bias, and
Wherein each display pixel is set at non-display operation state and comprises second voltage that is provided for described display pixel is set at described non-display operation state.
25. drive controlling method according to claim 23 wherein is set at each display pixel described non-display operation state and comprises by eliminating with the corresponding bias state of described level signal that is set in the described display pixel described display pixel is set at specific bias state.
26. drive controlling method according to claim 25 wherein is set at specific bias state by a kind of execution that applies in no-voltage and the reverse biased with described display pixel.
27. drive controlling method according to claim 25, wherein each described display pixel all comprises the display driver circuit of current-control type optical element and the described optical element operation of control, and
Wherein be used for described display driver circuit is set at first voltage with the corresponding forward bias condition of described level signal by applying to described display driver circuit, and, carry out that described display pixel is set at described display operation state by in described display driver circuit, keeping and described level signal correspondent voltage component.
28. drive controlling method according to claim 27, wherein by the described component of voltage that remains in the described display driver circuit is discharged, and, carry out that described display pixel is set at specific bias state by in described display driver circuit, applying and keeping a kind of in no-voltage and the reverse biased.
29. drive controlling method according to claim 27, wherein said optical element comprises light-emitting component, and this light-emitting component to be carrying out light emission operation with the corresponding brightness of the current value of the electric current that is applied to it, and
Wherein, make described display pixel carry out display operation by making described light-emitting component carry out brightness degree and the corresponding light emission operation of described level signal.
30. drive controlling method according to claim 29, wherein said light-emitting component comprises organic electroluminescent device.
31. drive controlling method according to claim 29, wherein provide described level signal to comprise to described display pixel to described display pixel grading current is provided, its current value that has makes described light-emitting component carry out brightness degree and the corresponding light emission operation of described video data.
32. drive controlling method according to claim 23, wherein the described a plurality of display pixels with described display panel are divided into a plurality of groups, and each group comprises a plurality of row, and
Wherein described display pixel is set at described display operation state and comprises first voltage that is provided for described display pixel is set at forward bias to each described display pixel of described group, make in each described group, simultaneously described display pixel is set at described display operation state.
33. drive controlling method according to claim 32, wherein each described a plurality of row of described group comprises a plurality of continuous row.
34. drive controlling method according to claim 32, wherein each described a plurality of row of described group comprises the row of a plurality of separation.
35. drive controlling method according to claim 32, wherein described display pixel is set at described non-display operation state and comprises second voltage that is provided for described display pixel is set at described non-display operation state to each described display pixel of described group, make in each described group, simultaneously described display pixel is set at described non-display operation state.
36. drive controlling method according to claim 32, wherein described display pixel is set at described non-display operation state comprise eliminate be set to described display pixel with the corresponding bias state of described level signal so that described display pixel is set at specific bias state.
37. drive controlling method according to claim 36, the operation that wherein described display pixel is set at described specific bias state comprises, simultaneously described a plurality of display pixels is set at described specific bias state in each described group.
38. drive controlling method according to claim 36 wherein is set at described display pixel described specific bias state and comprises that the row with described display pixel in each described group sequentially is set at described specific bias state.
CN2006800044944A 2005-05-24 2006-05-23 Display apparatus and drive control method thereof Expired - Fee Related CN101283391B (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2005150566A JP2006330138A (en) 2005-05-24 2005-05-24 Display device and display driving method thereof
JP150566/2005 2005-05-24
JP153382/2005 2005-05-26
JP2005153382A JP5110341B2 (en) 2005-05-26 2005-05-26 Display device and display driving method thereof
PCT/JP2006/310616 WO2006126703A2 (en) 2005-05-24 2006-05-23 Display apparatus and drive control method thereof

Publications (2)

Publication Number Publication Date
CN101283391A true CN101283391A (en) 2008-10-08
CN101283391B CN101283391B (en) 2011-03-23

Family

ID=37551912

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2006800044944A Expired - Fee Related CN101283391B (en) 2005-05-24 2006-05-23 Display apparatus and drive control method thereof

Country Status (2)

Country Link
JP (1) JP2006330138A (en)
CN (1) CN101283391B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102142228A (en) * 2010-01-28 2011-08-03 索尼公司 Display device, method of driving the display device, and electronic device
CN102214439A (en) * 2010-04-05 2011-10-12 精工爱普生株式会社 Light emitting device, electronic apparatus, and driving method of light emitting device
CN104424888A (en) * 2013-08-29 2015-03-18 索尼公司 Display panel, method of driving the same, and electronic apparatus
CN104424889A (en) * 2013-08-29 2015-03-18 索尼公司 Display panel, method of driving the same, and electronic apparatus
WO2015180354A1 (en) * 2014-05-26 2015-12-03 京东方科技集团股份有限公司 Pixel circuit, drive method for pixel circuit and display device
CN105493492A (en) * 2013-09-09 2016-04-13 奥林巴斯株式会社 Display control apparatus
CN107123400A (en) * 2016-02-25 2017-09-01 株式会社日本显示器 The driving method of display device and display device
CN107784987A (en) * 2016-08-31 2018-03-09 晶门科技有限公司 Method and apparatus for driving display pannel during closing period is shown
CN111696483A (en) * 2020-07-10 2020-09-22 京东方科技集团股份有限公司 Display panel, driving method thereof and display device

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5176522B2 (en) 2007-12-13 2013-04-03 ソニー株式会社 Self-luminous display device and driving method thereof
US8482494B2 (en) 2008-02-05 2013-07-09 Casio Computer Co., Ltd. Display drive apparatus, and display apparatus and display drive method thereof
JP4753096B2 (en) * 2008-02-05 2011-08-17 カシオ計算機株式会社 Display driving device, display device and display driving method thereof
JP4780121B2 (en) * 2008-03-04 2011-09-28 カシオ計算機株式会社 Display driving device, display device and display driving method thereof
JP2010039176A (en) * 2008-08-05 2010-02-18 Sony Corp Image display, and method for driving image device
JP5176799B2 (en) 2008-09-08 2013-04-03 船井電機株式会社 Laser driving circuit and laser display
KR101056317B1 (en) * 2009-04-02 2011-08-11 삼성모바일디스플레이주식회사 Pixel and organic light emitting display device using same
JP5077390B2 (en) * 2010-05-28 2012-11-21 カシオ計算機株式会社 Display driving device, display device and display driving method thereof
JP2012247731A (en) * 2011-05-31 2012-12-13 Nippon Hoso Kyokai <Nhk> Pixel circuit of active matrix display and driving method thereof
CN112885299B (en) * 2021-01-22 2022-06-24 合肥京东方卓印科技有限公司 Display brightness compensation method, compensation circuit and display device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1409402A (en) * 2001-09-21 2003-04-09 株式会社半导体能源研究所 Luminous device, luminous device driving method, and electronic equipment
US20030095087A1 (en) * 2001-11-20 2003-05-22 International Business Machines Corporation Data voltage current drive amoled pixel circuit
WO2004019314A1 (en) * 2002-08-26 2004-03-04 Casio Computer Co., Ltd. Display device and display device driving method
US20040090434A1 (en) * 2002-05-31 2004-05-13 Seiko Epson Corporation Electronic circuit, optoelectronic device, method for driving optoelectronic device, and electronic apparatus
WO2004086347A2 (en) * 2003-03-25 2004-10-07 Casio Computer Co., Ltd. A drive device and a display device
CN1575051A (en) * 2003-06-06 2005-02-02 罗姆股份有限公司 Organic el panel drive circuit and organic el display device using the same drive circuit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4074995B2 (en) * 2003-06-16 2008-04-16 カシオ計算機株式会社 CURRENT DRIVE CIRCUIT, CONTROL METHOD THEREOF, AND DISPLAY DEVICE PROVIDED WITH THE CURRENT DRIVE CIRCUIT
JP2004341267A (en) * 2003-05-16 2004-12-02 Casio Comput Co Ltd Display drive device, display device and driving control method thereof
JP4486335B2 (en) * 2003-09-30 2010-06-23 カシオ計算機株式会社 Display device and display panel driving method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1409402A (en) * 2001-09-21 2003-04-09 株式会社半导体能源研究所 Luminous device, luminous device driving method, and electronic equipment
US20030095087A1 (en) * 2001-11-20 2003-05-22 International Business Machines Corporation Data voltage current drive amoled pixel circuit
US20040090434A1 (en) * 2002-05-31 2004-05-13 Seiko Epson Corporation Electronic circuit, optoelectronic device, method for driving optoelectronic device, and electronic apparatus
WO2004019314A1 (en) * 2002-08-26 2004-03-04 Casio Computer Co., Ltd. Display device and display device driving method
WO2004086347A2 (en) * 2003-03-25 2004-10-07 Casio Computer Co., Ltd. A drive device and a display device
CN1575051A (en) * 2003-06-06 2005-02-02 罗姆股份有限公司 Organic el panel drive circuit and organic el display device using the same drive circuit

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102142228A (en) * 2010-01-28 2011-08-03 索尼公司 Display device, method of driving the display device, and electronic device
CN102142228B (en) * 2010-01-28 2014-10-22 索尼公司 Display device, method of driving the display device, and electronic device
CN102214439A (en) * 2010-04-05 2011-10-12 精工爱普生株式会社 Light emitting device, electronic apparatus, and driving method of light emitting device
CN104424889B (en) * 2013-08-29 2019-03-08 索尼公司 Display panel, the method and electronic equipment for driving display panel
CN104424889A (en) * 2013-08-29 2015-03-18 索尼公司 Display panel, method of driving the same, and electronic apparatus
CN104424888B (en) * 2013-08-29 2019-03-08 索尼公司 Display panel and its driving method and electronic equipment
CN104424888A (en) * 2013-08-29 2015-03-18 索尼公司 Display panel, method of driving the same, and electronic apparatus
CN105493492A (en) * 2013-09-09 2016-04-13 奥林巴斯株式会社 Display control apparatus
CN105493492B (en) * 2013-09-09 2018-10-12 奥林巴斯株式会社 Display control unit
WO2015180354A1 (en) * 2014-05-26 2015-12-03 京东方科技集团股份有限公司 Pixel circuit, drive method for pixel circuit and display device
US9886906B2 (en) 2014-05-26 2018-02-06 Boe Technology Group Co., Ltd. Pixel circuit, pixel circuit driving method and display device
CN107123400A (en) * 2016-02-25 2017-09-01 株式会社日本显示器 The driving method of display device and display device
CN107123400B (en) * 2016-02-25 2019-10-18 株式会社日本显示器 The driving method of display device and display device
CN107784987A (en) * 2016-08-31 2018-03-09 晶门科技有限公司 Method and apparatus for driving display pannel during closing period is shown
CN111696483A (en) * 2020-07-10 2020-09-22 京东方科技集团股份有限公司 Display panel, driving method thereof and display device
CN111696483B (en) * 2020-07-10 2022-04-08 京东方科技集团股份有限公司 Display panel, driving method thereof and display device

Also Published As

Publication number Publication date
CN101283391B (en) 2011-03-23
JP2006330138A (en) 2006-12-07

Similar Documents

Publication Publication Date Title
CN101283391B (en) Display apparatus and drive control method thereof
KR100962768B1 (en) Display apparatus and drive control method thereof
CN1989539B (en) Display drive apparatus, display apparatus and drive control method thereof
TWI330817B (en) Display drive apparatus, display apparatus and drive control method thereof
JP4852866B2 (en) Display device and drive control method thereof
CN100423070C (en) OLED display with ping pong current driving circuit and simultaneous scanning of lines
EP2595140B1 (en) Display device and method for driving same
JP5110341B2 (en) Display device and display driving method thereof
CN1918617B (en) Light emission drive circuit and its drive control method and display unit and its display drive method
US20050280613A1 (en) Display device and associated drive control method
CN101933075B (en) Display device and driving control method for the same
US20060017668A1 (en) Drive device and a display device
CN109308879A (en) Organic light emitting display and the method for sensing its deterioration
CN101430862A (en) Driving apparatus for organic electro-luminescence display device
JP4743485B2 (en) Display device and display driving method thereof
CN110517641A (en) Pixel circuit, parameter detection method, display panel and display device
CN107507574A (en) OLED display panel and its compensation method and device, display device
US7126566B2 (en) Driving circuit and driving method of active matrix organic electro-luminescence display
JP5182382B2 (en) Display device
CN102063862B (en) Display device, method of driving the same, and electronic unit
JP4780121B2 (en) Display driving device, display device and display driving method thereof
JP4753096B2 (en) Display driving device, display device and display driving method thereof
US20100214274A1 (en) Active-matrix display panel and device, and method for driving same
JP5182383B2 (en) Display device
JP5077390B2 (en) Display driving device, display device and display driving method thereof

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
C41 Transfer of patent application or patent right or utility model
TR01 Transfer of patent right

Effective date of registration: 20170117

Address after: Irish Ross Kang Wangjun

Patentee after: Soras OLED

Address before: Tokyo, Japan, Japan

Patentee before: Casio Computer Co., Ltd.

CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110323

Termination date: 20210523

CF01 Termination of patent right due to non-payment of annual fee