CN101324732B - Electronic paper display device and drive method thereof - Google Patents
Electronic paper display device and drive method thereof Download PDFInfo
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- CN101324732B CN101324732B CN2008101177304A CN200810117730A CN101324732B CN 101324732 B CN101324732 B CN 101324732B CN 2008101177304 A CN2008101177304 A CN 2008101177304A CN 200810117730 A CN200810117730 A CN 200810117730A CN 101324732 B CN101324732 B CN 101324732B
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Abstract
The invention relates to an electronic paper display device and a drive method thereof. The electronic paper display device comprises a plurality of pixels, wherein each pixel comprises at least two sub-pixels. The pixel electrode of each pixel is electrically connected with a signal bus and a gate bus, respectively. The pixel electrode area of each pixel increases progressively. The drive methodcan be used for driving the electronic paper display device of the invention, and comprises the steps as follows: acquiring the grey scales of the pixels; determining the grey scales of the sub-pixels as a combined grey scale display proposal according to the number of the sub-pixels and the grey scales of the pixels; applying signal voltages to the pixel electrodes of the sub-pixels belonging tothe pixels through a plurality of signal buses according to the combined grey scale display proposal while applying gate voltages to gate electrodes corresponding to the sub-pixels through the gate bus. The drive method improves the grey scale display capability of the electric paper display device, and improves the stability and the accuracy of the grey scale display effect.
Description
Technical field
The present invention relates to a kind of electronic paper display device, relate in particular to a kind of electronic paper display device that adopts the active matrix electrophoretic display technology.
Background technology
Electronic paper display device generally abbreviates Electronic Paper as, also is called digital paper, is the product that the characteristics of plain paper display message combine with the characteristics of computer display.Existing printed matter mainly adopts paper to realize, along with increasing sharply of paper consumption figure, environment has been caused very big destruction.In this case, electronic paper display device arises at the historic moment, the thickness of electronic paper display device can be suitable with plain paper, can duplicate the display property of paper and can reuse, and electronic paper display device can show dynamic menu, thereby electronic paper display device is considered to be expected to replace in the near future existing paper document and shows means.
Study the more electronic paper display device that is based on electrophoretic techniques at present.Electrophoresis is meant that charged particle moves in the electric field that applies.Electrophoresis showed belongs to a kind of bistable state and shows that the particle in the electrophoresis liquid all has two steady state (SS)s, if there is not the external force effect, this stable state can not change, thereby maintenance display pattern that can be permanent, so electrophoresis showed has extremely low power consumption levels.
Though the research of electrophoretic electronic paper display device just began as far back as the seventies, for solving problems such as its poor stability, life-span weak point, (the Massachusetts Institute ofTechnology of Massachusetts Institute Technology, abbreviation MIT) researcher handles by electrophoresis particle being carried out microencapsulation, solve the natural coagulation problems of particle, improved the stability of electrophoresis showed greatly.The microcapsules electric ink has successfully been realized industrialization by " E-INK " company at present.Some companies have released the e-book product based on the microcapsules electronic ink technologies." Sipix " company of the U.S. has then proposed another and has improved the means of electrophoresis solution stability, promptly little cup (micro-cup) technology.Little glass of technology injected electrophoresis liquid then by at first produce the grid of isolation on substrate in grid, intercept the cohesion of electrophoresis displaying particle by the dividing wall between the grid, so the stability and the life-span of having improved electrophoresis showed.
No matter microcapsules technology still is a little glass of technology, wants to realize the demonstration of text message, all needs to use the driven with active matrix technology.For example, thin film transistor (TFT) (Thin Film Transistor is hereinafter to be referred as TFT) technology is exactly realize active matrix a kind of.
The electrophoretic electronic paper display device is generally formed box by last substrate and following substrate, is filled with electrophoresis particle therebetween, and last substrate is provided with common electrode, and following substrate is provided with pixel electrode, and pixel electrode generally is rectangular laying, the corresponding pixel of each pixel electrode.With the tft active matrix is example, and pixel electrode links to each other by via hole with drain electrode among the TFT, and the source electrode among the TFT links to each other with signal bus, and the gate electrode among the TFT is connected on the grid bus.Based on said structure, gating with total each pixel of line traffic control of grid, when gate electrode feeds gate voltage, by active layer with drain electrode and source electrode conduction, then pixel electrode is applied with signal voltage by signal bus, cooperate the common electric voltage on the common electrode on electrophoresis particle, to form electric field, make electrophoresis particle can under electric field action, form required pattern.
But, the electrophoretic electronic paper display device of employing driven with active matrix technology, because the bistable characteristic of electrophoresis particle, the realization that causes many gray scales to show is comparatively difficult.For realizing that many gray scales show, traditional way is to improve driving voltage and the control accuracy of action time, the different corresponding different gray levels of driving voltage accumulation.But because the difference of the electrophoresis particle particle diameter and the quantity of electric charge, and the homogeneity of thicknesses of layers, having limited attainable valid gray level number, general attainable gray scale is no more than eight grades.
Summary of the invention
The purpose of this invention is to provide a kind of electronic paper display device, with the multi-grayscale demonstration of effective realization electronic paper display device.
For achieving the above object, the invention provides a kind of electronic paper display device, comprise a plurality of pixels, wherein: each pixel comprises N sub-pixel, the pixel electrode of each described sub-pixel is electrically connected with signal bus and grid bus respectively, and the pixel electrode area of each sub-pixel increases progressively, wherein, N is a natural number, and N 〉=2; The pixel electrode of each sub-pixel of each pixel is electrically connected with a grid bus, and is electrically connected with different signal bus; The pixel electrode area ratio of N described sub-pixel is greater than 2
0: ... 2
i: ...: 2
N, and less than (2
0)
2: ... (2
i)
2: ...: (2
N)
2, wherein, i is the natural number that increases progressively, and 0＜i＜N.
For achieving the above object, the present invention also provides a kind of driving method of electronic paper display device, comprising:
Obtain the gray shade scale of pixel, according to the number N of the sub-pixel that is comprised in the pixel, area increases progressively and the gray shade scale of described pixel, the gray shade scale of determining each described sub-pixel is as combination gray scale displaying scheme;
By the grid bus when the pairing gate electrode of each sub-pixel of described pixel applies gate voltage, apply signal voltage by N bars bus to the pixel electrode of the N that belongs to a described pixel sub-pixel according to described combination gray scale displaying scheme, present its gray shade scale to drive each sub-pixel respectively, the gray shade scale combination of each sub-pixel presents the gray shade scale of described pixel
Wherein, N is a natural number, and N 〉=2.
By above technical scheme as can be known, the present invention adopts pixel is divided into a plurality of sub-pixels, obtain the technological means of the gray shade scale of this pixel with bright, the dark gray levels combination of sub-pixel, improved the gray scale display capabilities of electronic paper display device, this gradation display method can not be subjected to the influence of factors such as pulsewidth, time, and the gray scale display effect is stable and more accurate.
Also in conjunction with the accompanying drawings the present invention is described in further detail below by specific embodiment.
Description of drawings
Fig. 1 is the plan structure synoptic diagram of electronic paper display device specific embodiment of the present invention;
Fig. 2 is the part section structural representation of electronic paper display device specific embodiment of the present invention.
Among the figure:
Substrate under the last substrate 2-of the 1-common electrode 3-
4-microcapsules 5-electrophoresis particle 6-pixel electrode
7- grid bus 81,82,83-signal bus 9-gate electrode
10-drain electrode 11-source electrode 12-ohmic contact layer
13-via hole 14-active layer 15-TFT channel protective layer
The 16-gate insulation layer 61-first pixel electrode 62-second pixel electrode
63-the 3rd pixel electrode
Embodiment
Electronic paper display device of the present invention comprises a plurality of pixels, and each pixel specifically comprises N sub-pixel again, and the pixel electrode of each sub-pixel correspondence is electrically connected with signal bus and grid bus respectively, and the pixel electrode area of each sub-pixel increases progressively, wherein, N is a natural number, and N 〉=2.Electronic paper display device of the present invention specifically be will existing electronic paper display device pixel segmentation become a plurality of sub-pixels and realize.Introduce respectively below in conjunction with embodiment.
Be illustrated in figure 1 as the plan structure synoptic diagram of electronic paper display device specific embodiment of the present invention, Fig. 2 is the part section structural representation of this electronic paper display device one subpixel area.In the present embodiment, as shown in Figure 1, pixel in the electronic paper display device is split into three sub-pixels, be respectively first sub-pixel, second sub-pixel and the 3rd sub-pixel, first pixel electrode 61, second pixel electrode 62 and the 3rd pixel electrode 63 in each subpixel area links to each other with 83 with TFT independently and different signal bus 81,82 respectively, and is connected jointly on the same grid bus 7 with TFT independently.As shown in Figure 2, this electronic paper display device is formed box by transparent last substrate 1 and following substrate 3 substrates, and last substrate 1 and following substrate 3 can adopt flexible transparent substrate, also can adopt rigidity transparent materials such as glass; Electrophoresis particle 5 is arranged within the microcapsules 4, fills between last substrate 1 and following substrate 3; Be provided with common electrode 2 at last substrate 1 towards the inboard of electrophoresis particle 5; Be provided with pixel electrode 6, grid bus 7, signal bus 81,82,83 and TFT towards the inboard of electrophoresis particle 5 at following substrate 3.Wherein, pixel electrode 6 is rectangular arrangement, and is corresponding with each sub-pixel respectively; Grid bus 7 and signal bus 81,82,83 are generally under crisscross being laid on the substrate 3, gate voltage in the grid bus 7 plays the effect of control TFT turn-on and turn-off, and then the writing and refresh of control picture element signal data, the displaying contents of pixel then offers pixel electrode 6 by the signal voltages of signal bus 81,82 and 83 inputs.TFT is made up of parts such as drain electrode 10, source electrode 11 and gate electrodes 9, particularly, the structure of TFT can adopt amorphous silicon (a-Si:H) the TFT structure of using in the available liquid crystal demonstration, be the structure of falling grid, the concrete annexation of TFT is: an end of drain electrode 10 is electrically connected with the pixel electrode 6 of each sub-pixel by via hole 13; One end of each source electrode 11 is electrically connected with signal bus 81,82 or 83 respectively; The other end of the other end of drain electrode 10 and source electrode 11 is oppositely arranged, and covers on the end of gate electrode 9; Between drain electrode 10 and source electrode 11 and gate electrode 9, also be provided with active layer 14, the material of active layer 14 can have multiple, for example amorphous silicon (a-Si:H), low temperature polycrystalline silicon, zinc paste or organic semiconductor etc., between active layer 14 and drain electrode 10 and source electrode 11, ohmic contact layer 12 can also be set, the material of ohmic contact layer 12 and active layer 14 materials adapt, for example, when adopting amorphous silicon (a-Si:H) preparation active layer 14, then can adopt N+ amorphous silicon (a-Si:H) material to prepare ohmic contact layer 12; Between pixel electrode 6 and following substrate 3, also be provided with layer structure such as TFT channel protective layer 15 and gate insulation layer 16; The other end of gate electrode 9 is electrically connected with grid bus 7, each sub-pixel that preferably belongs to same pixel is connected on same the grid bus 7 can control its break-make in the lump, and can be connected on different signal bus 81,82 and 83 to control the gray shade scale of sub-pixel respectively.Wherein, the pairing pixel electrode area ratio of first sub-pixel, second sub-pixel and the 3rd sub-pixel is 1: 2: 4, as shown in Figure 1.
The course of work of present embodiment electronic paper display device is: when gate voltage is high level, the grid bus by the gate electrode of company feed high level; Gate electrode makes corresponding source electrode and drain electrode conducting by active layer, thereby the signal voltage in the signal bus that these source electrodes are connected is applied on the pixel electrode of each sub-pixel, by the corresponding signal information of voltage three sub-pixels are write or refresh operation, make electrophoresis particle in each subpixel area can be under pixel electrode and the formed electric field of common electrode display image.Because each pixel in the present embodiment all is split into three sub-pixels, and each sub-pixel can access the independent control of signal bus, can present bright, dark two kinds of gray scales according to each sub-pixel calculates, then each pixel can present eight gray shade scales by the different show state combinations of three sub-pixels, as shown in table 1, the big more then pixel of pixel grey scale value of series is bright more:
Table 1
| First sub-pixel | Second sub-pixel | The 3rd sub-pixel | Pixel grayscale |
| Bright | Bright | Bright | 7? |
| Secretly | Bright | Bright | 6? |
| Bright | Secretly | Bright | 5? |
| Secretly | Secretly | Bright | 4? |
| Bright | Bright | Secretly | 3? |
| Secretly | Bright | Secretly | 2? |
| Bright | Secretly | Secretly | 1? |
| Secretly | Secretly | Secretly | 0? |
The technical scheme of present embodiment is a kind of novel dot structure design proposal, the existing single pixel that realizes that gray scale shows is divided into a plurality of sub-pixels by certain area ratio, the pairing pixel electrode of each sub-pixel all passes through the TFT on-off element and links to each other with the grid bus with signal bus, can control its brightness respectively, thereby realize many gray scales expressive ability of pixel.TFT in the present embodiment is liquid crystal indicator (Liquid Crystal Display, abbreviation LCD) standard bottom gate amorphous silicon (a-Si:H) structure commonly used in, in concrete the application, the technology that present embodiment is cut apart pixel also goes for adopting structures such as top gate type amorphous silicon (a-Si:H) TFT, microcrystal silicon TFT or low temperature polycrystalline silicon TFT, and can be with zinc paste (ZnO) or organic semiconductor as active layer.
In concrete the application, each pixel is cut apart the sub-pixel number that obtains and is not limited to three, two or more all can, can think that N is individual, N is a natural number, and N 〉=2, this is to be decided by the gray shade scale quantity that will reach.And the sub-pixel number that each pixel is cut apart in the electronic paper display device can not wait yet, and for example, can reduce the number of sub-pixel in edge or the insensitive place of gray shade scale.Simultaneously, each sub-pixel also is not limited to the series arrangement that increases progressively according to area, can design according to the distribution needs of picture element matrix.
The area ratio relation of each sub-pixel can be followed two cardinal rules and distribute.The one, the linear relationship principle, i.e. gray level and brightness is linear, so the pixel electrode area ratio of sub-pixel can be 2
0: ... 2
i: ...: 2
N, wherein, i is the natural number that increases progressively, and 0＜i＜N, for example when being divided into three sub-pixels, the pixel electrode area ratio just is 1: 2: 4.Another principle is based on visual effect, and brightness and normalized gray level square are approximated to direct ratio, and this pixel electrode area that requires sub-pixel is than near (2
0)
2: ... (2
i)
2: ...: (2
N)
2, for example when being divided into three sub-pixels, the pixel electrode area ratio should be near 1: 4: 16.Because of the latter causes the pixel electrode area of parton pixel too small, design and manufacturing are all very difficult, so the pixel electrode area ratio of actual sub-pixel should be between between the two, i.e. preferably two approaching sub-pixels of pixel electrode area, its pixel electrode area ratio should be controlled between 1: 2～1: 4, and the pixel electrode area ratio of N sub-pixel can be greater than 2 so
0: ... 2
i: ...: 2
N, and less than (2
0)
2: ... (2
i)
2: ...: (2
N)
2Have only at each sub-pixel under the situation of bright, dark two states, the attainable number of greyscale levels of this pixel is 2
NIndividual, need not in driving circuit, increase the circuit that drive signal waveform and application time are controlled this moment, can simplify existing drive unit circuit design.
In the present embodiment, because of swimming only just can take place in electrophoresis particle under electric field action, after removing extra electric field, particle meeting holding position is constant, in theory can be by to drive voltage amplitude with apply voltage time and control, increase the gray shade scale number of each sub-pixel, thereby the gray level that will go up in the table is further segmented increase overall gray level expressive ability.In the present embodiment, can also comprise a drive unit, link to each other with the grid bus, be used for each sub-pixel of respective pixel and produce drive signal, with each sub-pixel of this drive with setting amplitude and pulsewidth with each signal bus.When the attainable gray shade scale of each sub-pixel was M, the attainable number of greyscale levels of then whole pixel was (M-1) * 2
N, can further increase attainable gray shade scale quantity, wherein M is a natural number, is the drive signal control gray shade scale number of attainable each sub-pixel down.
Technical scheme of the present invention has realized the multi-grayscale display capabilities of pixel with the form of sub-pixel gray shade scale combination, and gray shade scale is more.And this display mode can not be subjected to the influence of labile factors such as pulse height and width, can not influence gray scale owing to the inconsistency of particle diameter, carried charge and microcapsules yardstick yet and show, so the demonstration of gray shade scale is stable more, accurate.
The electrophoresis particle of electronic paper display device of the present invention both can be arranged in the microcapsules, also can be arranged in little cup, and promptly existing microcapsules technology electronic paper display device and little glass of technology electronic paper display device all can adopt pixel segmentation technique of the present invention.
The driving method embodiment of electronic paper display device
The specific embodiment of the driving method of electronic paper display device of the present invention can be used to drive electronic paper display device of the present invention, for example drives the electronic paper display device of the foregoing description, and this driving method comprises the steps:
Drive unit is according to the video data signal of input, obtain the gray shade scale of each pixel in the electronic paper display device, the number N of the sub-pixel that increases progressively according to the pixel electrode area that is comprised in a certain pixel, and the gray shade scale of this pixel, the gray shade scale of determining each sub-pixel in this pixel specifically can only be determined bright, the dark state of sub-pixel as combination gray scale displaying scheme;
Drive unit applies gate voltage by the grid bus to the pairing gate electrode of each sub-pixel of this pixel, so that the pixel electrode of gating correspondence, meanwhile, drive unit applies signal voltage by N bars bus to the pixel electrode of the N that belongs to this a pixel sub-pixel according to combination gray scale displaying scheme, present its gray shade scale to drive each sub-pixel respectively, for example brighten or deepening, so that the gray shade scale of each sub-pixel is combined the gray scale that presents this pixel.Wherein, N is a natural number, and N 〉=2.
With above-mentioned electronic paper display device embodiment one is example, when each pixel has three sub-pixels, drives each sub-pixel and brightens or deepening, can obtain eight kinds of combinations, and then this pixel can correspondence present eight gray shade scales.
Further, drive unit can apply signal voltage by N bars bus to the pixel electrode of N sub-pixel according to combination gray scale displaying scheme, and drive the gray shade scale that each sub-pixel presents setting respectively with the signal voltage of setting amplitude and/or setting-up time, then each sub-pixel not only can present bright, dark two states, can also further be subdivided into a plurality of gray shade scales, then a plurality of sub-pixels can access more gray scale combination, to present the gray shade scale of this pixel.
The driving method of electronic paper display device of the present invention can be used to drive electronic paper display device of the present invention, pixel is divided into a plurality of sub-pixels, thereby obtain the technological means of a plurality of gray shade scales with array mode, improved the gray scale display capabilities of electronic paper display device, and it is stable, accurate that gray scale shows, is not subjected to the restriction of factors such as particle diameter, carried charge and microcapsules yardstick.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of programmed instruction, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (5)
1. an electronic paper display device comprises a plurality of pixels, it is characterized in that: each pixel comprises N sub-pixel, the pixel electrode of each described sub-pixel is electrically connected with signal bus and grid bus respectively, and the pixel electrode area of each sub-pixel increases progressively, wherein, N is a natural number, and N 〉=2;
The pixel electrode of each sub-pixel of each pixel is electrically connected with a grid bus, and is electrically connected with different signal bus;
The pixel electrode area ratio of N described sub-pixel is greater than 2
0: ... 2
i: ...: 2
N, and less than (2
0)
2: ... (2
i)
2: ...: (2
N)
2, wherein, i is the natural number that increases progressively, and 0＜i＜N.
2. electronic paper display device according to claim 1 is characterized in that: the electrophoresis particle in the described electronic paper display device is arranged in the microcapsules or is arranged in little cup.
3. electronic paper display device according to claim 1 and 2, it is characterized in that: described electronic paper display device is formed box by last substrate and following substrate, described inboard of going up substrate is provided with common electrode, the described inboard of substrate down is provided with each described pixel electrode, many grid buses, many barss bus and a plurality of thin film transistor (TFT), described pixel electrode and thin film transistor (TFT) are rectangular arrangement, corresponding with each sub-pixel respectively setting, drain electrode in each described thin film transistor (TFT) is electrically connected with the pixel electrode of each sub-pixel respectively, source electrode in each described thin film transistor (TFT) is electrically connected with each described signal bus respectively, gate electrode in each described thin film transistor (TFT) is electrically connected with described grid bus respectively, and described drain electrode and described source electrode are oppositely arranged and folded being located on active layer and the described gate electrode.
4. electronic paper display device according to claim 3 is characterized in that: the material of described active layer is a-Si:H, low temperature polycrystalline silicon, zinc paste or organic semiconductor.
5. electronic paper display device according to claim 3, it is characterized in that, also comprise: drive unit, be connected with the grid bus with each signal bus, be used for each sub-pixel of corresponding respectively described pixel and produce drive signal, drive each sub-pixel respectively with each described drive signal with setting amplitude and pulsewidth.
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| CN102156359B (en) * | 2010-06-13 | 2014-05-07 | 京东方科技集团股份有限公司 | Array base plate, liquid crystal panel, liquid crystal display and driving method |
| CN102568384B (en) * | 2010-12-17 | 2016-03-16 | 上海天马微电子有限公司 | Electronic paper display device |
| CN102654980B (en) | 2012-01-09 | 2015-01-14 | 京东方科技集团股份有限公司 | Electronic paper display device and driving method thereof |
| CN106782353B (en) * | 2013-03-01 | 2020-01-10 | 伊英克公司 | Method for driving electro-optic display |
| CN105022201B (en) * | 2014-04-22 | 2018-12-21 | 元太科技工业股份有限公司 | Electrophoretic display device |
| US10423028B2 (en) | 2014-04-22 | 2019-09-24 | E Ink Holdings Inc. | Display apparatus |
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| CN1892775A (en) * | 2005-07-04 | 2007-01-10 | 株式会社半导体能源研究所 | Display device and driving method of display device |
| CN1975547A (en) * | 2005-11-28 | 2007-06-06 | 元太科技工业股份有限公司 | Electronic ink displaying device |
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| CN1892775A (en) * | 2005-07-04 | 2007-01-10 | 株式会社半导体能源研究所 | Display device and driving method of display device |
| CN1975547A (en) * | 2005-11-28 | 2007-06-06 | 元太科技工业股份有限公司 | Electronic ink displaying device |
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