CN101739960A - Electrophoretic display device and driving method thereof - Google Patents
Electrophoretic display device and driving method thereof Download PDFInfo
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- CN101739960A CN101739960A CN200910252559A CN200910252559A CN101739960A CN 101739960 A CN101739960 A CN 101739960A CN 200910252559 A CN200910252559 A CN 200910252559A CN 200910252559 A CN200910252559 A CN 200910252559A CN 101739960 A CN101739960 A CN 101739960A
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Abstract
The invention discloses an electrophoretic display device with a critical voltage offset compensation function. The electrophoretic display device comprises a grid drive circuit, a data drive circuit, a controller and a pixel array, wherein the grid drive circuit provides a plurality of grid signals according to a scanning control signal; the data drive circuit provides a plurality of data signals according to a data control signal; the controller is used to provide the scanning control signal and the data control signal; and the pixel array is used to display images according to the multiple grid signals and data signals. During the operation of the electrophoretic display device of the invention, each frame time also contain the compensation frame time to perform the critical voltage offset compensation operation for multiple data switches of the pixel array unit, thus the reliability and service life of the electrophoretic display device can be significantly improved.
Description
Technical field
The present invention relates to a kind of electrophoretic display apparatus and driving method thereof, relate in particular to a kind of electrophoretic display apparatus and driving method thereof of tool critical voltage offset compensation function.
Background technology
Flat display apparatus (Flat Panel Display) has that external form is frivolous, power saving and advantage such as radiationless, so be widely used on the electronic products such as computer screen, mobile phone, personal digital assistant (PDA), flat-surface television.In in recent years, the display dealer has developed electrophoresis type display (claiming Electronic Paper again, Electronic Paper) in addition, so that more frivolous, soft and portable display further to be provided.Generally speaking, electrophoretic display apparatus comprises gate driver circuit, data drive circuit and a plurality of pixel.Gate driver circuit is used to provide a plurality of signals, and data drive circuit is used to provide a plurality of data-signals.A plurality of charged particles that each pixel has data switch, electrophoretic medium and is suspended in electrophoretic medium, the color of wherein a plurality of electrochondria is different from the color of electrophoretic medium.Data switch is according to the running that writes of signal control data signal, change the voltage difference at electrophoretic medium two ends according to this and adjust the levitation position of a plurality of charged particles in electrophoretic medium, so by the color contrast between a plurality of charged particles and the electrophoretic medium to represent required pixel gray level.
In the running of electrophoretic display apparatus, each image time comprises and writes the period and keep the period.Writing in the period, a plurality of charged particles of each pixel move to suitable levitation position, are used for representing required GTG, and are keeping in the period, a plurality of charged particles of all pixels maintain respectively and write the levitation position that the period adjusts, show image according to this.Yet electrophoretic display apparatus is when operation, because each signal remains on the accumulated time of low reference voltage and remains on the accumulated time of high reference voltage much larger than it, that is data switch bears the voltage stress of low reference voltage for a long time, so cause the critical voltage skew easily, thereby the fiduciary level and the serviceable life of reducing electrophoretic display apparatus.
Summary of the invention
According to embodiments of the invention, it discloses a kind of electrophoretic display apparatus of tool critical voltage offset compensation function.This kind electrophoretic display apparatus comprises gate driver circuit, data drive circuit, controller and pixel-array unit.Gate driver circuit is used for according to scan control signal and high reference voltage so that a plurality of signals to be provided, and wherein each signal comprises write-enable pulse and compensated pulse.Data drive circuit is used for according to data controlling signal so that a plurality of data-signals to be provided, and wherein a plurality of data-signals are set to common voltage in the compensation period.Controller is electrically connected on gate driver circuit and data drive circuit, is used to provide scan control signal and data controlling signal.Pixel-array unit is electrically connected on gate driver circuit and data drive circuit, is used for according to a plurality of signals and a plurality of data-signal with show image.In the running of electrophoretic display apparatus, gate driver circuit is writing in the period in order to the write-enable pulse of the high reference voltage of tool to be provided, gate driver circuit in the compensation period in order to the compensated pulse of the high reference voltage of tool to be provided.
According to embodiments of the invention, it discloses a kind of electrophoretic display apparatus of tool critical voltage offset compensation function in addition.This kind electrophoretic display apparatus comprises driving voltage generator, gate driver circuit, data drive circuit, controller, pixel-array unit, compensating unit and a plurality of gate line.The driving voltage generator is used to provide the first high reference voltage and low reference voltage.Gate driver circuit is electrically connected on the driving voltage generator, is used for according to scan control signal, the first high reference voltage and low reference voltage so that a plurality of signals to be provided.Data drive circuit is used for according to data controlling signal so that a plurality of data-signals to be provided, and wherein a plurality of data-signals are set to common voltage in the compensation period.Controller is electrically connected on gate driver circuit and data drive circuit, is used to provide scan control signal and data controlling signal.Pixel-array unit is electrically connected on gate driver circuit and data drive circuit, is used for according to a plurality of signals and a plurality of data-signal with show image.Compensating unit is electrically connected on pixel-array unit, is used to provide a plurality of compensated pulses of the tool second high reference voltage.A plurality of gate lines are electrically connected on gate driver circuit, compensating unit and pixel-array unit, are used for transmitting a plurality of signals or a plurality of compensated pulse.In the running of electrophoretic display apparatus, a plurality of gate lines are used for transmitting a plurality of signals that gate driver circuit provides writing in the period, and a plurality of gate lines are used for transmitting a plurality of compensated pulses that compensating unit provides in the compensation period.
The present invention discloses a kind of electrophoretic display apparatus driving method in addition, and it comprises: write in the period at one of an image time, data-signal to a pixel is provided; In this write the period, the signal of a write-enable pulse that tool one first high reference voltage is provided was used for this data-signal is write this pixel with a data switch of this pixel of conducting; In a compensation period of this image time, provide tool to use this data-signal of voltage altogether to this pixel; And in this compensation period, the compensated pulse that tool one second high reference voltage is provided is used for this data switch is carried out the running of critical voltage migration to this data switch.
In the running of the electrophoretic display apparatus of the embodiment of the invention, each image time all comprises the compensation period in addition, be used for a plurality of data switches of pixel-array unit are carried out the running of critical voltage migration, so can significantly improve the fiduciary level and the serviceable life of electrophoretic display apparatus.
Description of drawings
Fig. 1 is the synoptic diagram of the electrophoretic display apparatus of first embodiment of the invention.
Fig. 2 is the running coherent signal oscillogram of the electrophoretic display apparatus of Fig. 1, and wherein transverse axis is a time shaft.
Fig. 3 is the synoptic diagram of the electrophoretic display apparatus of second embodiment of the invention.
Fig. 4 is the running coherent signal oscillogram of the electrophoretic display apparatus of Fig. 3, and wherein transverse axis is a time shaft.
Fig. 5 is the synoptic diagram of the electrophoretic display apparatus of third embodiment of the invention.
Fig. 6 is the running coherent signal oscillogram of the electrophoretic display apparatus of Fig. 5, and wherein transverse axis is a time shaft.
Fig. 7 is the synoptic diagram of the electrophoretic display apparatus of fourth embodiment of the invention.
Fig. 8 is the process flow diagram of electrophoretic display apparatus driving method of the present invention.
Drawing reference numeral:
100,200,400,600 electrophoretic display apparatus
110,210,410 gate driver circuits
115 gate lines
120 data drive circuits
125 data lines
130,230,430 controllers
140,240,440 driving voltage generators
190 pixel-array unit
193 pixels
195 data switches
197 electrophoresis electric capacity
250 voltage selectors
251 first switches
253 second switches
460,660 compensating units
470,670 compensating controllers
475,675 switches
900 flow processs
Pn_m, Pn_m+1, pixel
Pn+1_m、Pn+1_m+1
S905～S940 step
Scs selects control signal
Sc_n, Sc_n+1, Sctr switch controlling signal
The Scd data controlling signal
SDm, SDm+1 data-signal
SGn, SGn+1 signal
The Sscan scan control signal
SW_n, SW_n+1 switch
Tcmp, Tcmp_n, compensation sub-period
Tcmp_n+1
Tw_n, Tw_n+1 write sub-period
The Vcom common voltage
The high reference voltage of Vgh
The Vgh1 first high reference voltage
The Vgh2 second high reference voltage
Vg1 hangs down reference voltage
Vneg bears driving voltage
The positive driving voltage of Vpos
The Vpx pixel voltage
Embodiment
Hereinafter according to electrophoretic display apparatus of the present invention and driving method thereof, elaborate especially exemplified by the embodiment conjunction with figs., but the embodiment that is provided not is the scope that contains in order to restriction the present invention, carry out precedence and the method flow number of steps is more non-in order to limit it, any execution flow process that reconfigures by method step, the method with impartial effect that produces is all the scope that the present invention is contained.
Fig. 1 is the synoptic diagram of the electrophoretic display apparatus of first embodiment of the invention.As shown in Figure 1, electrophoretic display apparatus 100 comprises gate driver circuit 110, data drive circuit 120, a plurality of gate line 115, a plurality of data line 125, controller 130, driving voltage generator 140 and pixel-array unit 190.Pixel-array unit 190 comprises a plurality of pixels 193, such as pixel Pn_m, pixel Pn_m+1, pixel Pn+1_m and pixel Pn+1_m+1.Each pixel 193 has data switch 195 and electrophoresis electric capacity 197.Driving voltage generator 140 is used to provide high reference voltage Vgh, low reference voltage Vg1, common voltage Vcom, positive driving voltage Vpos and negative driving voltage Vneg, and wherein common voltage Vcom is fed into each electrophoresis electric capacity 197.Controller 130 is used to provide scan control signal Sscan and data controlling signal Scd.
Fig. 2 is the running coherent signal oscillogram of the electrophoretic display apparatus 100 of Fig. 1, and wherein transverse axis is a time shaft.In Fig. 2, basipetal signal is respectively signal SGn, signal SGn+1, data-signal SDm and data-signal SDm+1.When electrophoretic display apparatus 100 has just come into operation, in reset stage, signal SGn, SGn+1 all comprises the replacement pulse of the high reference voltage Vgh of tool with a plurality of data switches 195 of conducting, be used for data-signal SDm, SDm+1 is fed into a plurality of electrophoresis electric capacity 197, activates a plurality of charged particles in electrophoretic medium according to this, and a plurality of charged particles are moved to initialized location.
Writing in the period of each image time, gate driver circuit 110 is exported signal SGn in regular turn, and the write-enable pulse of the high reference voltage Vgh of the tool of SGn+1 is used for control data signal SDm, and SDm+1 writes running.For example, in writing sub-period Tw-n, the write-enable pulse of the high reference voltage Vgh of the tool of signal SGn is used for enabling pixel Pn_m data-signal SDm is write its electrophoresis electric capacity 197, and is used for enabling pixel Pn_m+1 data-signal SDm+1 is write its electrophoresis electric capacity 197.Thereafter, in writing sub-period Tw_n+1, the write-enable pulse of the high reference voltage Vgh of the tool of signal SGn+1 is used for enabling pixel Pn+1_m data-signal SDm is write its electrophoresis electric capacity 197, and is used for enabling pixel Pn+1_m+1 data-signal SDm+1 is write its electrophoresis electric capacity 197.Please note, the high reference voltage Vgh of write-enable pulse can be identical or be different from the high reference voltage Vgh of replacement pulse, and signal SGn, SGn+1 also can be identical or be different from signal SGn at the low reference voltage Vg1 that writes the period, and SGn+1 is at the low reference voltage Vg1 of reset stage.
In the compensation period of each image time, gate driver circuit 110 is exported signal SGn in regular turn, and the compensated pulse of the high reference voltage Vgh of the tool of SGn+1 is used for the data switch 195 of pixel 193 is carried out the running of critical voltage migration.For example, in compensation sub-period Tcmp_n, the compensated pulse of the high reference voltage Vgh of the tool of signal SGn is used for the data switch 195 of pixel Pn_m and pixel Pn_m+1 is carried out the running of critical voltage migration.Thereafter, in compensation sub-period Tcmp_n+ 1, the compensated pulse of the high reference voltage Vgh of the tool of signal SGn+1 is used for the data switch 195 of pixel Pn+1_m and pixel Pn+1_m+1 is carried out the running of critical voltage migration.Note that data drive circuit 120 is used for all data-signals all are set at common voltage Vcom in the compensation period.
In one embodiment, controller 130 is used for writing second accumulated time that the period remains on first accumulated time of low reference voltage Vg1 and/or remain on low reference voltage Vg1 at reset stage to adjust the duration of compensated pulse according to each signal in addition.Furthermore, controller 130 can be according to first accumulated time and the duration of second ratio that writes first ratio of period and/or second accumulated time and reset stage with the adjustment compensated pulse.In another embodiment, driving voltage generator 140 is used for according to first accumulated time and/or second accumulated time in addition to adjust the high reference voltage Vgh of compensated pulse.Furthermore, driving voltage generator 140 can be according to first ratio and/or second ratio to adjust the high reference voltage Vgh of compensated pulse.That is compensated pulse and write-enable pulse can have different high reference voltage Vgh.
In the maintenance period of each image time, all signals are at floating state, so all data switches 195 make all pixel voltage Vpx all remain on common voltage Vcom all in cut-off state according to this.Because this moment, data-signal can't be fed into electrophoresis electric capacity 197, so data-signal might not remain on common voltage Vcom.From the above, in the running of electrophoretic display apparatus 100, comprise the compensation period in the image time, be used for a plurality of data switches 195 of pixel-array unit 190 are carried out the running of critical voltage migration, so can significantly improve the fiduciary level and the serviceable life of electrophoretic display apparatus 100.
Fig. 3 is the synoptic diagram of the electrophoretic display apparatus of second embodiment of the invention.As shown in Figure 3, electrophoretic display apparatus 200 comprises gate driver circuit 210, data drive circuit 120, a plurality of gate line 115, a plurality of data line 125, controller 230, driving voltage generator 240, voltage selector 250 and pixel-array unit 190.Driving voltage generator 240 is used to provide the first high reference voltage Vgh1, the second high reference voltage Vgh2, low reference voltage Vg1, common voltage Vcom, positive driving voltage Vpos and negative driving voltage Vneg, and wherein common voltage Vcom is fed into each electrophoresis electric capacity 197.The second high reference voltage Vgh2 can be identical or be different from the first high reference voltage Vgh1.Controller 230 is used to provide scan control signal Sscan, data controlling signal Scd and selects control signal Scs.Voltage selector 250 is electrically connected on driving voltage generator 240, controller 230 and gate driver circuit 210, is used for according to selecting control signal Scs to choose the first high reference voltage Vgh1 or the second high reference voltage Vgh2 as high reference voltage Vgh.Gate driver circuit 210 is electrically connected on controller 230, voltage selector 250 and driving voltage generator 240, be used for according to scan control signal Sscan, high reference voltage Vgh and low reference voltage Vg1 so that a plurality of signals to be provided, such as signal SGn and signal SGn+1.
In the embodiment shown in fig. 3, voltage selector 250 comprises first switch 251 and second switch 253.First switch 251 is electrically connected on controller 230, driving voltage generator 240 and gate driver circuit 210, is used for according to selecting control signal Scs that the first high reference voltage Vgh1 is output as high reference voltage Vgh.Second switch 253 is electrically connected on controller 230, driving voltage generator 240 and gate driver circuit 210, is used for according to selecting control signal Scs that the second high reference voltage Vgh2 is output as high reference voltage Vgh.In the running of electrophoretic display apparatus 200, writing in the period of each image time, the controller 230 output devices first State Selection control signal Scs is used for according to this first high reference voltage Vgh1 being output as high reference voltage Vgh by second switch 253 and conducting first switch 251.In addition, in the compensation period of each image time, the controller 230 output devices second State Selection control signal Scs is used for according to this second high reference voltage Vgh2 being output as high reference voltage Vgh by first switch 251 and conducting second switch 253.
Fig. 4 is the running coherent signal oscillogram of the electrophoretic display apparatus 200 of Fig. 3, and wherein transverse axis is a time shaft.In Fig. 4, basipetal signal is respectively signal SGn, signal SGn+1, data-signal SDm and data-signal SDm+1.When electrophoretic display apparatus 200 has just come into operation, in reset stage, voltage selector 250 is chosen the first high reference voltage Vgh1 as high reference voltage Vgh, and the signal SGn that gate driver circuit 210 is exported, SGn+1 promptly comprises the replacement pulse of the tool first high reference voltage Vgh1 with a plurality of data switches 195 of conducting, be used for data-signal SDm, SDm+1 is fed into a plurality of electrophoresis electric capacity 197, activate a plurality of charged particles in electrophoretic medium according to this, and a plurality of charged particles are moved to initialized location.
Writing in the period of each image time, voltage selector 250 is also chosen the first high reference voltage Vgh1 as high reference voltage Vgh, and gate driver circuit 210 is promptly exported signal SGn in regular turn, the write-enable pulse of the tool first high reference voltage Vgh1 of SGn+1, be used for control data signal SDm, SDm+1 writes running.For example, in writing sub-period Tw_n, the write-enable pulse of the tool first high reference voltage Vgh1 of signal SGn is used for enabling pixel Pn_m data-signal SDm is write its electrophoresis electric capacity 197, and is used for enabling pixel Pn_m+1 data-signal SDm+1 is write its electrophoresis electric capacity 197.Thereafter, in writing sub-period Tw_n+ 1, the write-enable pulse of the tool first high reference voltage Vgh1 of signal SGn+1 is used for enabling pixel Pn+1_m data-signal SDm is write its electrophoresis electric capacity 197, and is used for enabling pixel Pn+1_m+1 data-signal SDm+1 is write its electrophoresis electric capacity 197.Note that signal SGn, SGn+1 can be identical or be different from signal SGn at the low reference voltage Vg1 that writes the period, and SGn+1 is at the low reference voltage Vg1 of reset stage.
In the compensation period of each image time, voltage selector 250 is chosen the second high reference voltage Vgh2 as high reference voltage Vgh, and gate driver circuit 210 is promptly exported signal SGn in regular turn, the compensated pulse of the tool second high reference voltage Vgh2 of SGn+1 is used for the data switch 195 of pixel 193 is carried out the running of critical voltage migration.For example, in compensation sub-period Tcmp_n, the compensated pulse of the tool second high reference voltage Vgh2 of signal SGn is used for the data switch 195 of pixel Pn_m and pixel Pn_m+1 is carried out the running of critical voltage migration.Thereafter, in compensation sub-period Tcmp_n+ 1, the compensated pulse of the tool second high reference voltage Vgh2 of signal SGn+1 is used for the data switch 195 of pixel Pn+1_m and pixel Pn+1_m+1 is carried out the running of critical voltage migration.Note that as previously mentioned in the compensation period, data drive circuit 120 is used for all data-signals all are set at common voltage Vcom.
In one embodiment, controller 230 is used for writing second accumulated time that the period remains on first accumulated time of low reference voltage Vg1 and/or remain on low reference voltage Vg1 at reset stage to adjust the duration of compensated pulse according to each signal in addition.Furthermore, controller 230 can be according to first accumulated time and the duration of second ratio that writes first ratio of period and/or second accumulated time and reset stage with the adjustment compensated pulse.In another embodiment, driving voltage generator 240 is used for according to first accumulated time and/or second accumulated time in addition to adjust the second high reference voltage Vgh2.Furthermore, driving voltage generator 240 can be according to first ratio and/or second ratio to adjust the second high reference voltage Vgh2.Electrophoretic display apparatus 200 is keeping the running in the period to be same as the running of above-mentioned electrophoretic display apparatus 100 in the maintenance period, so repeat no more.From the above in the running of electrophoretic display apparatus 200, in image time, comprise the compensation period, be used for a plurality of data switches 195 of pixel-array unit 190 are carried out the running of critical voltage migration, so can significantly improve the fiduciary level and the serviceable life of electrophoretic display apparatus 200.
Fig. 5 is the synoptic diagram of the electrophoretic display apparatus of third embodiment of the invention.As shown in Figure 5, electrophoretic display apparatus 400 comprises gate driver circuit 410, data drive circuit 120, a plurality of gate line 115, a plurality of data line 125, controller 430, driving voltage generator 440, compensating unit 460 and pixel-array unit 190.Driving voltage generator 440 is used to provide the first high reference voltage Vgh1, low reference voltage Vg1, common voltage Vcom, positive driving voltage Vpos and negative driving voltage Vneg, and wherein common voltage Vcom is fed into each electrophoresis electric capacity 197.Controller 430 is used to provide scan control signal Sscan and data controlling signal Scd.Gate driver circuit 410 is electrically connected on controller 430 and driving voltage generator 440, be used for according to scan control signal Sscan, the first high reference voltage Vgh1 and low reference voltage Vg1 so that a plurality of signals to be provided, such as signal SGn and signal SGn+ 1.
Compensating unit 460 is electrically connected on pixel-array unit 190 via a plurality of gate lines 115, the a plurality of compensated pulses that are used for providing the tool second high reference voltage Vgh2 in the compensation period are as signal, and the data switch 195 to a plurality of pixels 193 carries out the running of critical voltage migration according to this.In other words, writing in the period, a plurality of gate lines 115 are used for transmitting a plurality of signals that gate driver circuit 410 is provided, and in the compensation period, a plurality of gate lines 115 are used for transmitting a plurality of compensated pulses that compensating unit 460 is provided.In the embodiment shown in fig. 5, compensating unit 460 comprises compensating controller 470 and a plurality of switch 475.Compensating controller 470 is used to provide second high reference voltage Vgh2 and the switch controlling signal Sctr.The second high reference voltage Vgh2 can be identical or be different from the first high reference voltage Vgh1.Each switch 475 comprises first end, second end and control end, wherein first end is electrically connected on compensating controller 470 to receive the second high reference voltage Vgh2, second end is used for exporting compensated pulse to corresponding gate line 115, and control end is electrically connected on compensating controller 470 with receiving key control signal Sctr.
Fig. 6 is the running coherent signal oscillogram of the electrophoretic display apparatus 400 of Fig. 5, and wherein transverse axis is a time shaft.In Fig. 6, basipetal signal is respectively signal SGn, signal SGn+1, data-signal SDm and data-signal SDm+1.When electrophoretic display apparatus 400 has just come into operation, in reset stage, signal SGn, SGn+1 all comprises the replacement pulse of the tool first high reference voltage Vgh1 with a plurality of data switches 195 of conducting, be used for data-signal SDm, SDm+1 is fed into a plurality of electrophoresis electric capacity 197, activates a plurality of charged particles in electrophoretic medium according to this, and a plurality of charged particles are moved to initialized location.
Writing in the period of each image time, gate driver circuit 410 is exported signal SGn in regular turn, and the write-enable pulse of the tool first high reference voltage Vgh1 of SGn+1 is used for control data signal SDm, and SDm+1 writes running.For example, in writing sub-period Tw_n, the write-enable pulse of the tool first high reference voltage Vgh1 of signal SGn is used for enabling pixel Pn_m data-signal SDm is write its electrophoresis electric capacity 197, and is used for enabling pixel Pn_m+1 data-signal SDm+1 is write its electrophoresis electric capacity 197.Thereafter, in writing sub-period Tw_n+ 1, the write-enable pulse of the tool first high reference voltage Vgh1 of signal SGn+1 is used for enabling pixel Pn+1_m data-signal SDm is write its electrophoresis electric capacity 197, and is used for enabling pixel Pn+1_m+1 data-signal SDm+1 is write its electrophoresis electric capacity 197.Note that signal SGn, SGn+1 can be identical or be different from signal SGn at the low reference voltage Vg1 that writes the period, and SGn+1 is at the low reference voltage Vg1 of reset stage.
In the compensation period of each image time, compensating unit 460 compensated pulse of the output device second high reference voltage Vgh2 simultaneously is fed into all gate lines 115 as signal, is used for carrying out the running of critical voltage migration.For example, in compensation sub-period Tcmp, signal SGn and signal SGn+1 are the compensated pulse of the tool second high reference voltage Vgh2, are used for simultaneously the data switch 195 of pixel Pn_m, Pn_m+1, Pn+1_m and Pn+1_m+1 is carried out the running of critical voltage migration.Note that as previously mentioned in the compensation period, data drive circuit 120 is used for all data-signals all are set at common voltage Vcom.
In one embodiment, compensating unit 460 can be used to writing second accumulated time that the period remains on first accumulated time of low reference voltage Vg1 and/or remain on low reference voltage Vg1 at reset stage to adjust the duration of compensated pulse according to each signal.Furthermore, compensating unit 460 can be according to first accumulated time and the duration of second ratio that writes first ratio of period and/or second accumulated time and reset stage with the adjustment compensated pulse.In another embodiment, compensating unit 460 is used for according to first accumulated time and/or second accumulated time in addition to adjust the second high reference voltage Vgh2.Furthermore, compensating unit 460 can be according to first ratio and/or second ratio to adjust the second high reference voltage Vgh2.Electrophoretic display apparatus 400 is keeping the running in the period to be same as the running of above-mentioned electrophoretic display apparatus 100 in the maintenance period, so repeat no more.From the above in the running of electrophoretic display apparatus 400, in image time, comprise the compensation period, be used for a plurality of data switches 195 of pixel-array unit 190 are carried out the running of critical voltage migration, so can significantly improve the fiduciary level and the serviceable life of electrophoretic display apparatus 400.
Fig. 7 is the synoptic diagram of the electrophoretic display apparatus of fourth embodiment of the invention.As shown in Figure 7, electrophoretic display apparatus 600 is similar to electrophoretic display apparatus shown in Figure 5 400, and main difference is compensating unit 460 is replaced into compensating unit 660.Compensating unit 660 comprises compensating controller 670 and a plurality of switch 675.Compensating controller 670 is used to provide second high reference voltage Vgh2 and a plurality of switch controlling signal, such as switch controlling signal Sc_n and switch controlling signal Sc_n+1.The second high reference voltage Vgh2 can be identical or be different from the first high reference voltage Vgh1.Each switch 675 comprises first end, second end and control end, wherein first end is electrically connected on compensating controller 670 to receive the second high reference voltage Vgh2, second end is used for exporting compensated pulse to corresponding gate line 115, and control end is electrically connected on compensating controller 670 to receive corresponding switch controlling signal.For example, the control end of switch SW _ n is electrically connected on compensating controller 670 with receiving key control signal Sc_n, and the control end of switch SW _ n+1 is electrically connected on compensating controller 670 with receiving key control signal Sc_n+ 1.
The running coherent signal waveform of electrophoretic display apparatus 600 is similar to waveform shown in Figure 4.Please refer to Fig. 4, when electrophoretic display apparatus 600 operates in compensation during the period, a plurality of switch controlling signals that compensating controller 670 is provided are used for a plurality of switches 675 of conducting in regular turn, the compensated pulse that the tool second high reference voltage Vgh2 is provided according to this in regular turn is used for the data switch 195 of pixel 193 is carried out the running of critical voltage migration as signal.For example, in compensation sub-period Tcmp_n, the switch controlling signal Sc_n that compensating controller 670 is provided is used for actuating switch SW_n, the compensated pulse of the tool second high reference voltage Vgh2 is provided according to this, is used for the data switch 195 of pixel Pn_m and pixel Pn_m+1 is carried out the running of critical voltage migration.Thereafter, in compensation sub-period Tcmp_n+1, the switch controlling signal Sc_n+1 that compensating controller 670 is provided is used for actuating switch SW_n+1, the compensated pulse of the tool second high reference voltage Vgh2 is provided according to this, is used for the data switch 195 of pixel Pn+1_m and pixel Pn+1_m+1 is carried out the running of critical voltage migration.Note that as previously mentioned in the compensation period, data drive circuit 120 is used for all data-signals all are set at common voltage Vcom.Compared to electrophoretic display apparatus shown in Figure 5 400, the compensating unit 660 of electrophoretic display apparatus 600 does not need to provide simultaneously a plurality of compensated pulses simultaneously all data switches 195 are carried out the running of critical voltage migration, so can significantly reduce the required driving force of the compensating controller 670 output second high reference voltage Vgh2.All the other runnings of electrophoretic display apparatus 600 are same as electrophoretic display apparatus shown in Figure 5 400, so repeat no more.
Fig. 8 is the process flow diagram of electrophoretic display apparatus driving method of the present invention.Flow process 900 shown in Figure 8 is the electrophoretic display apparatus driving method based on the pixel-array unit 190 shown in above-mentioned first to fourth embodiment.Electrophoretic display apparatus driving method shown in the flow process 900 comprises the following step:
Step S905: in a reset stage, provide signal to a pixel of tool one replacement pulse;
Step S910: write in the period at one of an image time, provide a data-signal to this pixel;
Step S920: in this write the period, this signal of a write-enable pulse that the tool first high reference voltage is provided was used for this data-signal is write this pixel with a data switch of this pixel of conducting;
Step S930: in a compensation period of this image time, provide tool to use this data-signal of voltage altogether to this pixel; And
Step S940: in this compensation period, the compensated pulse that the tool second high reference voltage is provided is used for this data switch is carried out the running of critical voltage migration to this data switch.
In the flow process 900 of electrophoretic display apparatus driving method, the second high reference voltage of this compensated pulse can write the period at this according to this signal and remain on one first accumulated time of low reference voltage and/or adjust in one second accumulated time that this reset stage remains on low reference voltage.Furthermore, second of this compensated pulse high reference voltage can according to this first accumulated time and this writes one first ratio of period and one second ratio of this second accumulated time and/or this reset stage is adjusted.Perhaps, the duration of this compensated pulse is adjusted according to this first accumulated time and/or this second accumulated time.Furthermore, the duration of this compensated pulse is adjusted according to this first ratio and/or this second ratio.
In sum, in the running of electrophoretic display apparatus of the present invention, each image time all comprises the compensation period in addition, is used for a plurality of data switches of pixel-array unit are carried out the running of critical voltage migration, so can significantly improve the fiduciary level and the serviceable life of electrophoretic display apparatus.
Though the present invention discloses as above with embodiment; right its is not in order to limit the present invention; any have a technical field of the invention know the knowledgeable usually; without departing from the spirit and scope of the present invention; when can doing various changes and retouching, so protection scope of the present invention is as the criterion when looking the claim scope person of defining.
Claims (26)
1. an electrophoretic display apparatus is characterized in that, described electrophoretic display apparatus comprises:
One gate driver circuit is used for according to one scan control signal and a high reference voltage so that a plurality of signals to be provided, and wherein each signal comprises a write-enable pulse and a compensated pulse;
One data drive circuit is used for according to a data controlling signal so that a plurality of data-signals to be provided, and wherein said data-signal is set in a compensation period and uses voltage altogether;
One controller is electrically connected on described gate driver circuit and described data drive circuit, is used to provide described scan control signal and described data controlling signal; And
One pixel-array unit is electrically connected on described gate driver circuit and described data drive circuit, is used for according to described signal and described data-signal with show image;
Wherein said gate driver circuit writes in the period in order to the said write enabling pulse of the described high reference voltage of tool to be provided one, described gate driver circuit in the described compensation period in order to the described compensated pulse of the described high reference voltage of tool to be provided.
2. electrophoretic display apparatus as claimed in claim 1 is characterized in that, described electrophoretic display apparatus also comprises:
One driving voltage generator is electrically connected on described gate driver circuit, is used to provide described high reference voltage.
3. electrophoretic display apparatus as claimed in claim 2 is characterized in that, described driving voltage generator remains on an accumulated time of a low reference voltage to adjust the described high reference voltage of described compensated pulse according to described signal in the said write period.
4. electrophoretic display apparatus as claimed in claim 3 is characterized in that, described driving voltage generator according to described accumulated time and the ratio of said write period to adjust the described high reference voltage of described compensated pulse.
5. electrophoretic display apparatus as claimed in claim 1 is characterized in that, described controller remains on an accumulated time of a low reference voltage to adjust a duration of described compensated pulse according to described signal in the said write period.
6. electrophoretic display apparatus as claimed in claim 5 is characterized in that, described controller according to described accumulated time and the ratio of said write period to adjust the described duration.
7. electrophoretic display apparatus as claimed in claim 1 is characterized in that, in order to provide one to select control signal, described electrophoretic display apparatus also comprises described controller in addition:
One driving voltage generator is used to provide one first high reference voltage and one second high reference voltage; And
One voltage selector is electrically connected on described driving voltage generator, described controller and described gate driver circuit, is used for choosing the described first high reference voltage or the described second high reference voltage as described high reference voltage according to described selection control signal.
8. electrophoretic display apparatus as claimed in claim 7, it is characterized in that, described voltage selector is chosen the described first high reference voltage as described high reference voltage in said write in the period, described voltage selector is chosen the described second high reference voltage as described high reference voltage in the described compensation period.
9. electrophoretic display apparatus as claimed in claim 8 is characterized in that, described driving voltage generator remains on an accumulated time of a low reference voltage to adjust the described second high reference voltage according to described signal in the said write period.
10. electrophoretic display apparatus as claimed in claim 9 is characterized in that, described driving voltage generator according to described accumulated time and the ratio of said write period to adjust the described second high reference voltage.
11. electrophoretic display apparatus as claimed in claim 7 is characterized in that, described voltage selector comprises:
One first switch is electrically connected on described controller, described driving voltage generator and described gate driver circuit, is used for according to described selection control signal the described first high reference voltage being output as described high reference voltage; And
One second switch is electrically connected on described controller, described driving voltage generator and described gate driver circuit, is used for according to described selection control signal the described second high reference voltage being output as described high reference voltage;
Wherein when described selection control signal is one first state, described first switch conduction is to be output as described high reference voltage with the described first high reference voltage, when described selection control signal was one second state, described second switch conducting was to be output as described high reference voltage with the described second high reference voltage.
12. an electrophoretic display apparatus is characterized in that, described electrophoretic display apparatus comprises:
One driving voltage generator is used to provide one first a high reference voltage and a low reference voltage;
One gate driver circuit is electrically connected on described driving voltage generator, is used for according to one scan control signal, the described first high reference voltage and described low reference voltage so that a plurality of signals to be provided;
One data drive circuit is used for according to a data controlling signal so that a plurality of data-signals to be provided, and wherein said data-signal is set in a compensation period and uses voltage altogether;
One controller is electrically connected on described gate driver circuit and described data drive circuit, is used to provide described scan control signal and described data controlling signal;
One pixel-array unit is electrically connected on described gate driver circuit and described data drive circuit, is used for according to described signal and described data-signal with show image;
One compensating unit is electrically connected on described pixel-array unit, is used to provide a plurality of compensated pulses of tool one second high reference voltage; And
A plurality of gate lines are electrically connected on described gate driver circuit, described compensating unit and described pixel-array unit, are used for transmitting described signal or described compensated pulse;
Wherein said gate line writes one and is used for transmitting the described signal that described gate driver circuit provides in the period, and described gate line is used for transmitting the described compensated pulse that described compensating unit provides in the described compensation period.
13. electrophoretic display apparatus as claimed in claim 12 is characterized in that, described compensating unit remains on an accumulated time of described low reference voltage to adjust the described second high reference voltage in the said write period according to each signal.
14. electrophoretic display apparatus as claimed in claim 13 is characterized in that, described compensating unit according to described accumulated time and the ratio of said write period to adjust the described second high reference voltage.
15. electrophoretic display apparatus as claimed in claim 12 is characterized in that, described compensating unit remains on an accumulated time of described low reference voltage to adjust a duration of each compensated pulse in the said write period according to each signal.
16. electrophoretic display apparatus as claimed in claim 15 is characterized in that, described compensating unit according to described accumulated time and the ratio of said write period to adjust the described duration.
17. electrophoretic display apparatus as claimed in claim 12 is characterized in that, described compensating unit comprises:
One compensating controller is used to provide the described second high reference voltage and a switch controlling signal; And
A plurality of switches, each switch comprises:
One first end is electrically connected on described compensating controller to receive the described second high reference voltage;
One second end is electrically connected on a corresponding gate line of described gate line, is used for exporting described benefit
Repay a corresponding compensated pulse of pulse; And
One control end is electrically connected on described compensating controller to receive described switch controlling signal.
18. electrophoretic display apparatus as claimed in claim 12 is characterized in that, described compensating unit comprises:
One compensating controller is used to provide the described second high reference voltage and a plurality of switch controlling signal; And
A plurality of switches, each switch comprises:
One first end is electrically connected on described compensating controller to receive the described second high reference voltage;
One second end is electrically connected on a corresponding gate line of described gate line, is used for exporting described benefit
Repay a corresponding compensated pulse of pulse; And
One control end is electrically connected on described compensating controller to receive one of described switch controlling signal
Corresponding switch controlling signal.
19. an electrophoretic display apparatus driving method is characterized in that, described electrophoretic display apparatus driving method comprises:
Write in the period at one of an image time, data-signal to a pixel is provided;
In said write in the period, the signal of a write-enable pulse that tool one first high reference voltage is provided is used for described data-signal is write described pixel with a data switch of the described pixel of conducting;
In a compensation period of described image time, provide tool altogether with the described data-signal of voltage to described pixel; And
In the described compensation period, the compensated pulse that tool one second high reference voltage is provided is used for described data switch is carried out the running of critical voltage migration to described data switch.
20. electrophoretic display apparatus driving method as claimed in claim 19 is characterized in that, the described second high reference voltage of described compensated pulse is adjusted according to the accumulated time that described signal remains on a low reference voltage in the said write period.
21. electrophoretic display apparatus driving method as claimed in claim 20 is characterized in that, the described second high reference voltage of described compensated pulse is adjusted according to described accumulated time and the ratio of said write period.
22. electrophoretic display apparatus driving method as claimed in claim 19 is characterized in that, a duration of described compensated pulse is adjusted according to the accumulated time that described signal remains on a low reference voltage in the said write period.
23. electrophoretic display apparatus driving method as claimed in claim 22 is characterized in that, the described duration of described compensated pulse is adjusted according to described accumulated time and the ratio of said write period.
24. electrophoretic display apparatus driving method as claimed in claim 19 is characterized in that, described electrophoretic display apparatus driving method also comprises:
In the reset stage before described image time, the described signal that tool one replacement pulse is provided is to described pixel.
25. electrophoretic display apparatus driving method as claimed in claim 24, it is characterized in that, the described second high reference voltage of described compensated pulse according to described signal in that to remain on a low reference voltage be one first accumulated time the said write period and adjust in one second accumulated time that described reset stage remains on described low reference voltage; And
One duration of described compensated pulse is adjusted according to described first accumulated time and described second accumulated time.
26. electrophoretic display apparatus driving method as claimed in claim 25, it is characterized in that the described second high reference voltage of described compensated pulse is adjusted according to one first ratio of described first accumulated time and said write period and one second ratio of described second accumulated time and described reset stage; And
The described duration of described compensated pulse is adjusted according to described first ratio and described second ratio.
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| CN2009102525592A CN101739960B (en) | 2009-12-29 | 2009-12-29 | Electrophoretic display device and driving method thereof |
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| CN2009102525592A CN101739960B (en) | 2009-12-29 | 2009-12-29 | Electrophoretic display device and driving method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102779477A (en) * | 2012-05-02 | 2012-11-14 | 友达光电股份有限公司 | Driving method of organic light emitting diode display panel |
| CN103854622A (en) * | 2014-03-03 | 2014-06-11 | 昆山龙腾光电有限公司 | Gate drive circuit |
| CN110070835A (en) * | 2018-01-22 | 2019-07-30 | 矽创电子股份有限公司 | Electronic paper display driving circuit |
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2009
- 2009-12-29 CN CN2009102525592A patent/CN101739960B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102779477A (en) * | 2012-05-02 | 2012-11-14 | 友达光电股份有限公司 | Driving method of organic light emitting diode display panel |
| CN102779477B (en) * | 2012-05-02 | 2015-01-07 | 友达光电股份有限公司 | Driving method of organic light emitting diode display panel |
| CN103854622A (en) * | 2014-03-03 | 2014-06-11 | 昆山龙腾光电有限公司 | Gate drive circuit |
| CN103854622B (en) * | 2014-03-03 | 2016-05-11 | 昆山龙腾光电有限公司 | A kind of gate driver circuit |
| CN110070835A (en) * | 2018-01-22 | 2019-07-30 | 矽创电子股份有限公司 | Electronic paper display driving circuit |
| CN110070835B (en) * | 2018-01-22 | 2021-05-28 | 矽创电子股份有限公司 | Electronic paper display driving circuit |
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| CN101739960B (en) | 2011-12-07 |
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