CN101556767B - Method for driving electrophoresis display unit - Google Patents
Method for driving electrophoresis display unit Download PDFInfo
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- CN101556767B CN101556767B CN2009101117651A CN200910111765A CN101556767B CN 101556767 B CN101556767 B CN 101556767B CN 2009101117651 A CN2009101117651 A CN 2009101117651A CN 200910111765 A CN200910111765 A CN 200910111765A CN 101556767 B CN101556767 B CN 101556767B
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Abstract
A method for driving an electrophoresis display unit sequentially comprises the following steps of: writing first grayscale data into a first pixel; writing second grayscale data into a second pixel; resetting the first pixel; resetting the second pixel; after resetting the first pixel, writing third grayscale data into the first pixel immediately; and after resetting the second pixel, writing fourth grayscale data into the second pixel immediately. The method for driving the electrophoresis display unit has the advantages of shortening the time required for displaying a picture by writing the next grayscale data immediately after resetting each pixel, thus improving the ghost phenomenon when the electrophoresis display unit updates pictures.
Description
[technical field]
The invention relates to a kind of driving method of electrophoresis type display, refer to a kind of driving method of electrophoresis type display of the ghost that improves frame update especially.
[background technology]
Paper is present widely used display device, because paper has broad angular field of view, frivolous tool pliability, advantage such as be easy to carry.Need expend a large amount of natural resourcess yet make traditional paper, and the information on the traditional paper be non-renewable or only renewable minority several times.Therefore, electrophoresis type display (claiming Electronic Paper again, Electronic Paper) can be taken into account the advantage of paper and the characteristic of the renewable information of electronic installation, and is widely used.
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of the displaying principle of electrophoresis type display 100.Electrophoresis type display 100 comprises a plurality of charged particles 101, electrophoretic medium 102, top electrode 103 and bottom electrode 104.Top electrode 103 and bottom electrode 104 are arranged at the two ends of electrophoretic medium 102 respectively, and top electrode 103 is a transparency electrode, and bottom electrode 104 is the segmentation metal electrode.Charged particle 101 is positively charged, be suspended between the electrophoretic medium 102, and with electrophoretic medium 102 be different colours.Usually charged particle 101 is white Titanium particles (TiO
2), and electrophoretic medium 102 is a black.By applying external electrical field, can change the position of the charged particle 101 that is suspended in the electrophoretic medium 102 in top electrode 103 and bottom electrode 104.Electrophoresis type display 100 utilizes the position that changes charged particle 101, shows charged particle 101 and electrophoretic medium 102, or the color contrast between charged particle 101 and the charged particle 101, with the color that shows as image.
The diverse location that charged particle 101 rests on electrophoretic medium 102 can produce different GTG colors.As shown in Figure 1, the charged particle 101 of pixel P1 rests on the top electrode 103 near electrophoretic medium 102, makes pixel P1 present white.The charged particle 101 of pixel P2 rests on the bottom electrode 104 near electrophoretic medium 102, makes pixel P2 present black.The white charged particles 101 of pixel P3 rests on the centre position of electrophoretic medium 102, makes pixel P3 present a GTG color.Therefore, charged particle 101 rests on the position in the electrophoretic medium 102, can determine the dark bright degree of GTG of corresponding pixel.That is to say that electrophoresis type display 100 is reflective display mechanism, does not need backlight.The position of charged particle 101 in electrophoretic medium 102 determined that by driving voltage and voltage pulse periods driving voltage puts on top electrode 103 and bottom electrode 104.The polarity of driving voltage has determined on the position of charged particle 101 in electrophoretic medium 102 to rise or descend (the also deepening that brightens that shows for GTG), and the length of voltage pulse periods has then determined to rise on the position of charged particle 101 in electrophoretic medium 102 or the degree that the descends size of GTG demonstration variation (also for).
Please also refer to Fig. 1 and Fig. 2.Fig. 2 applies the synoptic diagram of driving voltage in charged particle 101.When electrophoresis type display 100 comes into operation, because the charged particle 101 among the pixel P1 is through all not moving after a while, so apply a positive voltage V earlier
POSWith a negative voltage V
NEGMake its activation in charged particle 101, with initialization electrophoresis type display 100.After finishing initialization, by applying positive voltage V
POSIn bottom electrode 104, elapsed time t
G1, make charged particle 101 move to the position of corresponding luma data G1 in the electrophoretic medium 102, so that luma data G1 is write pixel P1.Pixel P1 must reset and just can write next record luma data G2 after (Erase), and the time of resetting approximates the time that writes greatly usually, therefore, and by applying negative voltage V
NEGIn bottom electrode 104, elapsed time t
G1, make charged particle 101 get back to initialized position.Pixel P1 is after resetting, by applying positive voltage V
POSIn bottom electrode 104, through burst length t
G2, luma data G2 is write pixel P1.After charged particle 101 arrived the pairing position of luma data, even no longer apply positive voltage, charged particle 101 can not move to initial position or other position yet, and this is bistable state (Bi-stable) feature of electrophoresis type display 100.Therefore, electrophoresis type display 100 still can keep original show image behind power-off, and only just needs electrification when frame update (also promptly apply electric field and come mobile charged particle).
Please refer to Fig. 3.Fig. 3 is the sequential chart of driving voltage of the electrophoresis type display of prior art.t
0Be the required time of initialization.t
WRITEFor whole pixels write the required time of luma data.t
ERASEFor resetting the required time of whole pixels.t
REFRESHFor upgrading the time that picture is required.As shown in Figure 3, the image that the electrophoresis type display of prior art shows comprises pixel PX1～PXm, wherein writes the required write time t of luma data Gm of pixel PXm
mFor the longest, so when resetting, the replacement time t that pixel PXm is required
mFor also the longest.When the electrophoresis type display frame update, other pixel must wait for that after finishing replacement pixel PXm also finishes replacement and just can write the next record luma data.Therefore, the required time t of whole pixels that resets
ERASEEqual the longest replacement time t
m, and t update time of prolongation picture
REFRESHWhen the frame updating overlong time of electrophoresis type display, can cause ghost and influence picture quality.
[summary of the invention]
Technical matters to be solved by this invention is to provide a kind of driving method of electrophoresis type display of the ghost can improve frame update the time.
The present invention solves the problems of the technologies described above by the following technical programs: a kind of driving method of electrophoresis type display comprises the following step of carrying out in regular turn:
Write one first luma data in one first pixel;
Write one second luma data in one second pixel;
This first pixel of resetting;
This second pixel of resetting;
After this first pixel of resetting, write one the 3rd luma data immediately in this first pixel; And
After this second pixel of resetting, write one the 4th luma data immediately in this second pixel.
This invention further is specially:
Write this first luma data when this first pixel, apply that a positive electricity is pressed on this first pixel and through a very first time; Write this second luma data when this second pixel, apply that this positive electricity is pressed on this second pixel and through one second time.
When resetting this first pixel, apply a negative electricity and be pressed on this first pixel and this very first time of process; When resetting this second pixel, apply this negative electricity and be pressed on this second pixel and this second time of process.
This very first time is not equal to this second time.
Write the 3rd luma data when this first pixel, apply that this positive electricity is pressed on this first pixel and through one the 3rd time; Write the 4th luma data when this second pixel, apply that this positive electricity is pressed on this second pixel and through one the 4th time.
Writing one first luma data before the step of one first pixel, also comprising provides an electrophoretic medium and a plurality of charged particles is provided.
Write this first luma data in this first pixel for the charged particle of this first pixel being urged to this electrophoretic medium to position that should first GTG, write this second luma data and be urged to this electrophoretic medium to position that should second GTG for charged particle this second pixel in this second pixel.
This first pixel of resetting is for being urged to the charged particle of this first pixel the initial position of this electrophoretic medium, and this second pixel of resetting is for being urged to the charged particle of this second pixel the initial position of this electrophoretic medium.
The advantage of the driving method of electrophoresis type display of the present invention is: each pixel writes the next record luma data immediately after finishing replacement, need not wait for after other pixel is finished replacement and just carry out next write step.Like this, just can shorten time that picture is required of demonstration, and then reduce the ghost phenomena of previous picture.
[description of drawings]
The invention will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the synoptic diagram of the displaying principle of electrophoresis type display.
Fig. 2 applies the synoptic diagram of driving voltage in charged particle.
Fig. 3 is the sequential chart of driving voltage of the electrophoresis type display of prior art.
Fig. 4 is the synoptic diagram of electrophoresis type display of the present invention.
Fig. 5 is the explanation data exported of time schedule controller of the present invention and the synoptic diagram of pixel corresponding relation.
The synoptic diagram of the truth table of the data corresponding voltage that Fig. 6 exports for time schedule controller.
Fig. 7 is the sequential chart of time schedule controller output data of the present invention.
Fig. 8 is the sequential chart of the driving voltage of electrophoresis type display of the present invention.
[embodiment]
Please refer to Fig. 4.Fig. 4 is the synoptic diagram of electrophoresis type display 400 of the present invention.Electrophoresis type display 400 comprises an electrophoresis showed (electrophoretic display, EPD) material substrate 401, a TFT (Thin Film Transistor, thin film transistor (TFT)) substrate 402 and a drive system 420.Electrophoresis showed material substrate 401 comprises one first transparency conducting layer 410 and an electrophoretic medium 411.TFT substrate 402 comprises one second transparency conducting layer 412 and a glass substrate 413.Drive system 420 comprises time schedule controller (Timing Controller) 421, one internal memory, 422, one DC-DC converters (DC/DCconverter) 423 and one source pole/base drive device (Source/gate driver) 424.Time schedule controller 421 provides a Control of Voltage signal to DC-DC converter 423, and the while also provides data D7～D0 to source electrode/base drive device 424.Internal memory 422 is electrically connected at time schedule controller 421, is used for storing writing/the replacement data of each pixel.DC-DC converter 423 is electrically connected at time schedule controller 421, is used for producing driving voltage V according to the Control of Voltage signal
COM, V
GH, V
GL, V
POSAnd V
NEGSource electrode/base drive device 424 is electrically connected at time schedule controller 421 and DC-DC converter 423, and the driving voltage V that the data D7～D0 that provided according to time schedule controller 421 and DC-DC converter 423 provided is provided
GH, V
GL, V
POSAnd V
NEG, export the thin film transistor (TFT) (TFT) of a driving voltage to the glass substrate 413, produce electric fields by second transparency conducting layer 412 and move it with the charged particle that drives in the electrophoretic medium 411.
Please also refer to the 4th, Fig. 5 and Fig. 6.Fig. 5 is the explanation data D7～D0 that exported of time schedule controller 421 of the present invention and the synoptic diagram of pixel PX1～PX4 corresponding relation, the synoptic diagram of the truth table of data D7～D0 corresponding voltage that Fig. 6 is exported for time schedule controller 421.As shown in Figure 4, data D7～D0 of being exported of time schedule controller 421 is 8.Source electrode/base drive device 424 decides the magnitude of voltage that exports the thin film transistor (TFT) on the glass substrate 413 to according to the data D7～D0 that receives.As shown in Figure 5, data D7～D0 can determine the magnitude of voltage of four pixel PX1～PX4 in the picture.For instance, data D7 and D6 are used for controlling pixel PX1, data D5 and D4 is used for controlling pixel PX2, data D3 and D2 is used for controlling pixel PX3, and data D1 and D0 are used for controlling pixel PX4.As shown in Figure 6, different output combinations can determine the magnitude of voltage that source electrode/424 pairs of corresponding pixels of base drive device are exported through data D7～D0.For instance, when data D5 is logical zero (electronegative potential) and data D4 when being logical one (noble potential), source electrode/base drive device 424 output voltage V
NEGGive pixel PX2.Further, suppose that first data that pixel PX1 desire shows are GTG G1, and GTG G1 needs 5 signal cycles just can finish, time schedule controller 421 can make source electrode/base drive device 424 output voltage values V at the data D7 of the time remaining ground in 5 signal cycles output logic " 0 " (electronegative potential) and the data D6 of logical zero (electronegative potential)
POSTherefore, pixel PX1 finishes at all after dates of 5 signals and writes GTG G1 (charged particle arrives GTG G1 pairing position in electrophoretic medium), and time schedule controller 421 just stops the data D7 of output logic " 0 " (electronegative potential) and the data D6 of logical zero (electronegative potential).When replacement pixel PX1, because the time of resetting approximates the time that writes greatly, time schedule controller 421 can make source electrode/base drive device 424 output voltage values V at the data D7 of the time remaining ground in 5 signal cycles output logic " 0 " (electronegative potential) and the data D6 of logical one (noble potential)
NEGTherefore, pixel PX1 5 signals week after date finish replacement (charged particle is got back to the initial position in electrophoretic medium), time schedule controller 421 is the data D6 of the data D7 of output logic " 0 " (electronegative potential) and logical one (noble potential) no longer just.Pixel PX1 must reset earlier before writing the next record luma data, and in embodiments of the present invention, after replacement pixel PX1, write the next record luma data immediately.
Please refer to Fig. 7.Fig. 7 is the sequential chart of time schedule controller 321 output data D7～D0 of the present invention.t
WRITE_1For pixel PX1 writes required time of first luma data, t
ERASE_1For pixel PX1 resets the required time of first luma data, and t
WRITE_2For pixel PX1 writes the required time of second luma data.Time schedule controller 421 utilizes internal memory 422 to store writing/the replacement data of each pixel, can make the replacement step of each pixel independent.That is to say, after pixel PX1 resets first luma data, can carry out writing of second luma data immediately, just carry out t
WRITE_2Therefore, the replacement step of each pixel does not just need to wait for other pixel and the data that can directly carry out next step write.Thus, the needed replacement time of frame update just can reduce, and then improves the ghost phenomena of picture.
Please refer to Fig. 8.Fig. 8 is the sequential chart of the driving voltage of electrophoresis type display of the present invention.Pixel PX1 and pixel PX2 with Fig. 5 are example, at first, respectively pixel PX1 and pixel PX2 are applied positive voltage V
POS, elapsed time t0/2 applies negative voltage V again
NEGElapsed time t0/2 is to carry out initialization to pixel PX1 and pixel PX2.Then, pixel PX1 is applied positive voltage V
POSElapsed time t1 applies positive voltage V so that luma data G1 is write pixel PX1 to pixel PX2
POSElapsed time t2 is to write pixel PX2 with luma data G2.Before pixel PX1 and pixel PX2 were write the next record luma data, pixel PX1 and pixel PX2 reset earlier.Pixel PX1 finishes and writes the required time of luma data G1 is t1, so the required time of replacement pixel PX1 is approximately t1, pixel PX2 finishes and writes the required time of luma data G2 is t2, so the required time of replacement pixel PX2 is approximately t2.Because the replacement time of each pixel is all different, in order to shorten the update time of whole image, each pixel just writes the next record luma data immediately after resetting.Therefore, after finishing replacement pixel PX1, immediately pixel PX1 is write luma data G3, similarly, after finishing replacement pixel PX2, immediately pixel PX2 is write luma data G4.Each pixel can write the next record luma data after resetting, and does not need to wait for that other pixel finishes replacement.Therefore, the replacement pixel required time t of each pixel
ERASEBe all independence, make and upgrade t update time that picture is required
REFRESHSignificantly shorten, and then improve the ghost phenomena of picture.
In sum, the invention provides a kind of driving method of electrophoresis type display, the ghost during with reduction electrophoresis type display frame updating.This electrophoresis type display comprises a plurality of pixels, and wherein one first pixel writes one first luma data, and one second pixel writes one second luma data.When this electrophoresis type display frame update, this first pixel of resetting respectively and this second pixel, then, after this first pixel of resetting, write one the 3rd luma data immediately in this first pixel, similarly, after this second pixel of resetting, write one the 4th luma data immediately in this second pixel.Therefore, each pixel writes the next record luma data immediately finishing replacement, need not wait for after other pixel is finished replacement and just carry out next write step.Like this, just can shorten time that picture is required of demonstration, and then reduce the ghost phenomena of previous picture.
Though more than described the specific embodiment of the present invention; but being familiar with those skilled in the art is to be understood that; our described specific embodiment is illustrative; rather than be used for qualification to scope of the present invention; those of ordinary skill in the art are in the modification and the variation of the equivalence of doing according to spirit of the present invention, all should be encompassed in the scope that claim of the present invention protects.
Claims (7)
1. the driving method of an electrophoresis type display is characterized in that: comprise the following step of carrying out in regular turn:
One electrophoretic medium is provided and a plurality of charged particles are provided;
Write one first luma data in one first pixel;
Write one second luma data in one second pixel;
This first pixel of resetting;
This second pixel of resetting;
After this first pixel of resetting, write one the 3rd luma data immediately in this first pixel; And
After this second pixel of resetting, write one the 4th luma data immediately in this second pixel.
2. the driving method of electrophoresis type display as claimed in claim 1 is characterized in that: write this first luma data when this first pixel, apply that a positive electricity is pressed on this first pixel and through a very first time; Write this second luma data when this second pixel, apply that this positive electricity is pressed on this second pixel and through one second time.
3. the driving method of electrophoresis type display as claimed in claim 2 is characterized in that: when resetting this first pixel, apply a negative electricity and be pressed on this first pixel and this very first time of process; When resetting this second pixel, apply this negative electricity and be pressed on this second pixel and this second time of process.
4. as the driving method of claim 2 or 3 described electrophoresis type displays, it is characterized in that: this very first time is not equal to this second time.
5. as the driving method of claim 2 or 3 described electrophoresis type displays, it is characterized in that: write the 3rd luma data when this first pixel, apply that this positive electricity is pressed on this first pixel and through one the 3rd time; Write the 4th luma data when this second pixel, apply that this positive electricity is pressed on this second pixel and through one the 4th time.
6. the driving method of electrophoresis type display as claimed in claim 1, it is characterized in that: write this first luma data in this first pixel for the charged particle of this first pixel being urged to this electrophoretic medium to position that should first GTG, write this second luma data and be urged to this electrophoretic medium to position that should second GTG for charged particle this second pixel in this second pixel.
7. the driving method of electrophoresis type display as claimed in claim 1, it is characterized in that: this first pixel of resetting is for being urged to the charged particle of this first pixel the initial position of this electrophoretic medium, and this second pixel of resetting is for being urged to the charged particle of this second pixel the initial position of this electrophoretic medium.
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| CN2009101117651A CN101556767B (en) | 2009-05-14 | 2009-05-14 | Method for driving electrophoresis display unit |
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|---|---|---|---|
| CN2009101117651A CN101556767B (en) | 2009-05-14 | 2009-05-14 | Method for driving electrophoresis display unit |
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| CN101556767B true CN101556767B (en) | 2011-11-30 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101819752B (en) * | 2010-03-23 | 2012-07-25 | 友达光电股份有限公司 | Electrophoresis display device and driving method thereof |
| CN102254516B (en) * | 2010-05-18 | 2014-04-30 | 华映科技（集团）股份有限公司 | Electrophoresis type display and drive method thereof |
| CN102376256A (en) * | 2010-08-10 | 2012-03-14 | 台达电子工业股份有限公司 | Driving method of display unit |
| US9349327B2 (en) * | 2010-12-06 | 2016-05-24 | Lg Display Co., Ltd. | Electrophoretic display apparatus, method for driving same, and method for measuring image stability thereof |
| TWI490839B (en) * | 2013-02-07 | 2015-07-01 | Sipix Technology Inc | Electrophoretic display and method of operating an electrophoretic display |
| KR20130040997A (en) | 2013-03-13 | 2013-04-24 | 주식회사 나노브릭 | Method and apparatus for controlling transmittance and reflectance by usnig particles |
| CN105139811B (en) * | 2015-09-30 | 2017-12-22 | 深圳市国华光电科技有限公司 | A kind of electrophoretic display device (EPD) weakens the driving method of ghost |
| CN106601195B (en) * | 2016-12-29 | 2019-03-26 | 深圳市国华光电科技有限公司 | A kind of method and apparatus for eliminating electrophoretic electronic paper image boundary |
| CN110010080B (en) * | 2018-01-05 | 2020-11-17 | 元太科技工业股份有限公司 | Electrophoretic display and driving method thereof |
| CN110738972B (en) * | 2018-01-22 | 2021-05-18 | 青岛海信移动通信技术股份有限公司 | Page refreshing method and device for ink screen |
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Effective date of registration: 20180816 Address after: 1# third, fourth floor, No. 6, Ru Jiang West Road, Mawei District, Fuzhou City, Fujian Province Co-patentee after: Chunghwa Picture Tubes Ltd. Patentee after: CPT DISPLAY TECHNOLOGY (SHENZHEN)CO., LTD. Address before: 350015 Mawei Technology Park, Fuzhou, Fuzhou, Fujian Co-patentee before: Chunghwa Picture Tubes Ltd. Patentee before: Fujian Huaying Display Technology Co., Ltd. |
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