CN102981657B - Touch type electronic paper display - Google Patents
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- CN102981657B CN102981657B CN201110259997.9A CN201110259997A CN102981657B CN 102981657 B CN102981657 B CN 102981657B CN 201110259997 A CN201110259997 A CN 201110259997A CN 102981657 B CN102981657 B CN 102981657B
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Abstract
The present invention relates to a kind of touch type electronic paper display, comprise an electronic-paper display screen and a functional layer, this electronic-paper display screen comprises a common electrode layer, and there is a display surface, this functional layer is arranged at this display surface, described functional layer comprises a carbon nano-tube touch function layer further, and described carbon nano-tube touch function layer is arranged on this display surface, and the distance between this common electrode layer and this carbon nano-tube touch function layer is greater than 100 microns and is less than or equal to 2 millimeters.
Description
Technical field
The present invention relates to a kind of electric paper display, particularly relate to a kind of touch type electronic paper display.
Background technology
Owing to having the advantages such as low-power consumption, flexible, thickness is thin, electronic-paper display screen is widely used in, in the electronic products such as mobile phone, e-book, computing machine and personal digital assistant, using as display screen.
The structure of electronic-paper display screen generally includes electric pole plate, lower electrode plate and is arranged at the electrophoretic display medium layer between this electric pole plate and lower electrode plate.This electric pole plate comprises upper substrate and is arranged at public tin indium oxide (ITO) electrode of this upper substrate lower surface, and this lower electrode plate comprises infrabasal plate and is arranged at the thin film transistor (TFT) of this infrabasal plate upper surface (TFT) pixel electrode.This electrophoretic display medium layer fits tightly between this public ITO electrode and TFT pixel electrode.
Notification number is that the Chinese patent of CN101373305B discloses a kind of electric paper display with touch function, existing resistive touch screen is directly sticked to the upper surface of the upper substrate of electronic-paper display screen.But, because electronic-paper display screen carries out image display by reflect external light, usually itself back lighting device is not possessed, when the existing resistive touch screen of superposition further on electronic-paper display screen, metal on touch-screen or ITO circuit meeting stop portions light therethrough, and make the light of arrival electronic-paper display screen have comparatively high attenuation, thus affect the display of electronic-paper display screen.
Summary of the invention
In view of this, necessaryly provide a kind of display device of electronic paper with touch function, utilize comparatively simple structure, avoid light losing, and can touch function be realized.
A kind of touch type electronic paper display, comprise an electronic-paper display screen and a functional layer, this electronic-paper display screen comprises a common electrode layer, and there is a display surface, this functional layer is arranged at this display surface, described functional layer comprises a carbon nano-tube touch function layer further, and described carbon nano-tube touch function layer is arranged on this display surface, and the distance between this common electrode layer and this carbon nano-tube touch function layer is greater than 100 microns and is less than or equal to 2 millimeters.
The touch type electronic paper display of the present invention has carbon nano-tube touch function layer, because carbon nano-tube material and the thin characteristic of layer and solve the known problem being applied to metal on the touch-screen of Electronic Paper or ITO circuit stop portions light, moreover, because carbon nano tube line has impedance anisotropy and spacing is fine and closely woven, therefore the sensing precision of electric paper display can be significantly improved.Further, between the common electrode layer of this electronic-paper display screen and this carbon nano-tube touch function layer, there is enough spacing distances, thus avoid the work because of this electronic-paper display screen 10 cause background capacitance excessive and have an impact to the sensing of touch point electric capacity.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the carbon nano-tube touch function layer of one embodiment of the invention.
Fig. 2 is the drive waveforms schematic diagram of each change-over switch when scanning in the driving circuit of one embodiment of the invention.
Under simulation test shown in Fig. 3 to Fig. 5, the signal received by electrode X3 to X6.
Fig. 6 is the side-looking structural representation of first embodiment of the invention Electronic Paper.
Fig. 7 is the stereoscan photograph of first embodiment of the invention carbon nano-tube film.
Fig. 8 is the structural representation of carbon nano-tube fragment in the carbon nano-tube film of Fig. 7.
Fig. 9 is the side-looking structural representation of second embodiment of the invention Electronic Paper.
Figure 10 is the side-looking structural representation of third embodiment of the invention Electronic Paper.
Main element symbol description
| Electronic-paper display screen | 10 |
| Functional layer | 20 |
| First bonding coat | 30 |
| Carbon nano-tube touch function layer | 100 |
| Carbon nano-tube film | 110 |
| Side | 112、114、116、118 |
| Drive sensing electrode | 120 |
| Driving circuit | 130 |
| Ground unit | 132 |
| Scanning element | 134 |
| Carbon nano-tube fragment | 143 |
| Carbon nano-tube | 145 |
| Transparent insulation wall | 190 |
| Anti-glare layer | 200 |
| Broken line | 310、320、330、340、350、360、370、380、390 |
| Second bonding coat | 400 |
| Waterproof gas-bearing formation | 410 |
| Touch type electronic paper display | 500、510、520 |
| Lower electrode plate | 610 |
| Infrabasal plate | 612 |
| Pixel electrode layer | 614 |
| Electric pole plate | 620 |
| Upper substrate | 622 |
| Common electrode layer | 624 |
| Electrophoretic display medium layer | 630 |
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
Below in conjunction with the accompanying drawings and the specific embodiments touch type electronic paper display provided by the invention is described in further detail.
The invention provides a kind of touch type electronic paper display, comprise an electronic-paper display screen and a functional layer, this electronic-paper display screen comprises a common electrode layer, and there is a display surface, this functional layer is arranged at this display surface, described functional layer comprises a carbon nano-tube touch function layer further, and described carbon nano-tube touch function layer is arranged on this display surface.
Refer to Fig. 1 and Fig. 6, first embodiment of the invention provides a kind of touch type electronic paper display 500, and it comprises electronic-paper display screen 10, first bonding coat 30 and functional layer 20 from bottom to up successively.This first bonding coat 30 is arranged between this electronic-paper display screen 10 and functional layer 20, and bonds this electronic-paper display screen 10 and this functional layer 20.In this manual " on " be direction near user, D score is the direction away from user.This functional layer 20 at least comprises a carbon nano-tube touch function layer 100, and this carbon nano-tube touch function layer 100 is arranged on the display surface of described electronic-paper display screen 10 by this first bonding coat 30.This electronic-paper display screen 10 comprises common electrode layer 624, i.e. a upper electrode layer.Distance between this common electrode layer 624 and this carbon nano-tube touch function layer 100 is greater than 100 microns, is preferably greater than 125 microns, is more preferably greater than 175 microns.
This carbon nano-tube touch function layer 100 is the single layer structure that can realize touch function, and this carbon nano-tube touch function layer 100 comprises carbon nano-tube film 110 and multiple driving sensing electrode 120, and the plurality of driving sensing electrode 120 is electrically connected with this carbon nano-tube film 110.In the present embodiment, this carbon nano-tube touch function layer 100 and bonding coat 30 overlap.This carbon nano-tube film 110 directly covers this first bonding coat 30.This carbon nano-tube touch function layer 100 only can comprise multiple carbon nano-tube films 110 of a carbon nano-tube film 110 or laminating, and drives sensing electrode 120 can realize the function of sensing touch position.
This carbon nano-tube film 110 comprises multiple carbon nano-tube, and the plurality of carbon nano-tube substantially along equidirectional the direction detection extends, thus makes carbon nano-tube film 110 on the bearing of trend of the plurality of carbon nano-tube, have conductivity much larger than other direction.This carbon nano-tube film 110 by pulling formation from a carbon nano pipe array.The described overall bearing of trend pulling most of carbon nano-tube in the carbon nano-tube film 110 of formation from carbon nano pipe array substantially in the same direction and be parallel to the surface of this carbon nano-tube film 110.And, substantially in the most of carbon nano-tube extended in the same direction in described carbon nano-tube film 110, each carbon nano-tube and carbon nano-tube adjacent are in the direction of extension joined end to end by Van der Waals force (vanderwaal ' sforce), thus make this carbon nano-tube film 110 realize self-supporting.The carbon nano-tube film 110 obtained should be pulled from carbon nano pipe array and there is good transparency.Preferably, this carbon nano-tube film 110 is the pure nano-carbon tube film 110 be made up of carbon nano-tube, thus can improve the penetrability of touch-screen.
Refer to Fig. 7, this carbon nano-tube film 110 comprises multiple carbon nano tube line arranged in parallel, and this carbon nano tube line is made up of along multiple carbon nano-tube of equidirectional the direction detection extends substantially described.The self supporting structure that described carbon nano-tube film 110 is made up of some carbon nano-tube.Described some carbon nano-tube are that preferred orientation extends in the same direction.Described preferred orientation refers to the overall bearing of trend of most of carbon nano-tube in carbon nano-tube film 110 substantially in the same direction.And the overall bearing of trend of described most of carbon nano-tube is basically parallel to the surface of carbon nano-tube film 110.Further, in described carbon nano-tube film 110, most carbon nano-tube is joined end to end by Van der Waals force.Particularly, in the most of carbon nano-tube extended substantially in the same direction in described carbon nano-tube film 110, each carbon nano-tube and carbon nano-tube adjacent are in the direction of extension joined end to end by Van der Waals force.Certainly, there is the carbon nano-tube of minority random alignment in described carbon nano-tube film 110, these carbon nano-tube can not form obviously impact to the overall orientation arrangement of carbon nano-tube most of in carbon nano-tube film 110.Described self-supporting is that carbon nano-tube film 110 does not need large-area carrier supported, as long as and relatively both sides provide support power can be unsettled on the whole and keep self membranaceous state, by this carbon nano-tube film 110 be placed in (or being fixed on) keep at a certain distance away arrange two supporters on time, the carbon nano-tube film 110 between two supporters can the membranaceous state of unsettled maintenance self.Described self-supporting mainly through exist in carbon nano-tube film 110 continuously through Van der Waals force join end to end extend arrangement carbon nano-tube and realize.
Particularly, the most carbon nano-tube extended substantially in the same direction in described carbon nano-tube film 110, and nisi linearity, can be suitable bend; Or and non-fully arranges according on bearing of trend, can be suitable depart from bearing of trend.Therefore, can not get rid of between carbon nano-tube arranged side by side in the most carbon nano-tube extended substantially in the same direction of carbon nano-tube film 110 and may there is part contact.
Refer to Fig. 8, particularly, described carbon nano-tube film 110 comprise multiple continuously and the carbon nano-tube fragment 143 aligned.The plurality of carbon nano-tube fragment 143 is joined end to end by Van der Waals force.Each carbon nano-tube fragment 143 comprises multiple carbon nano-tube 145 be parallel to each other, and the plurality of carbon nano-tube 145 be parallel to each other is combined closely by Van der Waals force.This carbon nano-tube fragment 143 has arbitrary length, thickness, homogeneity and shape.Carbon nano-tube 145 in this carbon nano-tube film 110 is arranged of preferred orient in the same direction.Carbon nano tube line in this carbon nano-tube film 110 forms by described carbon nano-tube fragment 143 is end to end.Overlapped by carbon nano-tube between adjacent carbon nano tube line.Can gap be had between carbon nano-tube in this carbon nano-tube film 110, thus make the thickness in this carbon nano-tube film 110 thickness be about 0.5 nanometer to 100 micron, be preferably 0.5 nanometer to 10 micron.
From carbon nano pipe array, pull the concrete grammar obtaining described carbon nano-tube film 110 comprise: (a) be a selected carbon nano-tube fragment 143 from a carbon nano pipe array, the present embodiment is preferably the adhesive tape that adopts and have one fixed width or adherent base bar contacts this carbon nano pipe array with a selected carbon nano-tube fragment 143 with one fixed width; B (), by this stretching tool mobile, pulls this selected carbon nano-tube fragment 143 with certain speed, thus the multiple carbon nano-tube fragment 143 of end to end pull-out, and then form a continuous print carbon nano-tube film 110.The plurality of carbon nano-tube makes this carbon nano-tube fragment 143 have one fixed width mutually side by side.When this chosen carbon nano-tube fragment 143 is under a stretching force along pulling while direction departs from the growth substrate of carbon nano pipe array gradually, due to van der Waals interaction, other carbon nano-tube fragment 143 adjacent with this selected carbon nano-tube fragment 143 is one after the other drawn out end to end, thus is formed one continuously, evenly and have the carbon nano-tube film 110 of one fixed width and preferred orientation.Described carbon nano-tube film 110 has minimum electrical impedance at draw direction, and have perpendicular to draw direction maximum resistance resist, thus electrical impedance anisotropy is possessed, namely carbon nano-tube film 110 has impedance anisotropy, namely, carbon nano-tube film 110 has different resistance in two different directions, with define one comparatively Low ESR direction D(be basically parallel to carbon nano-tube bearing of trend), and one higher resistance direction H(be basically perpendicular to carbon nano-tube bearing of trend), wherein comparatively Low ESR direction D can be vertical with higher resistance direction H.Carbon nano tube line in this carbon nano-tube film 110 also has impedance anisotropy, and the direction of this carbon nano tube line parallel is comparatively Low ESR direction D, and vertically the direction of this carbon nano tube line is higher resistance direction H.Carbon nano-tube film 110 can be rectangle, and has four side, is sequentially side 112, side 114, side 116 and side 118.Side 112 is relative with side 116 and be parallel to higher resistance direction H, and side 114 and side 118 are relatively and be parallel to comparatively Low ESR direction D.Owing to having impedance anisotropy, this carbon nano-tube touch function layer 100 can realize sensing multiple point touching.For the impedance anisotropy scope of the carbon nano-tube film 110 of carbon nano-tube touch function layer 100, be preferably this higher resistance direction H and 50 should be more than or equal to compared with the ratio of Low ESR direction D, being preferably 70 ~ 500.
This carbon nano-tube touch function layer 100 can comprise multiple carbon nano-tube film 110, mutually stacking or be arranged side by side, therefore length and the width of above-mentioned electric paper display are not limit, and can arrange according to actual needs.In addition, this carbon nano-tube film 110 has a desirable penetrability, and visible light transmissivity is greater than 85%.
The plurality of driving sensing electrode 120 is configured at the side 112 of carbon nano-tube film 110.Each drives sensing electrode 120 to connect at least one relative carbon nano tube line and adjacent multiple carbon nano tube lines.Each driving sensing electrode 120 can be between 1mm to 8mm along the length W1 on the H of higher resistance direction, and the spacing W2 of adjacent driven sensing electrode 120 can be between 3mm to 5mm.Thus, each signal driving sensing electrode 120 to input to carbon nano-tube film 110 or to be received from carbon nano-tube film 110 will mainly transmit along comparatively Low ESR direction D.This carbon nano-tube touch function layer 100 just can utilize the directive characteristic of Signal transmissions tool as the basis for estimation of touch position.Certainly, in the product of reality, each application of driving the size of sensing electrode and spacing can look resolution needed for product and product and different.That is, numerical value described above is only the use that illustrates and is not used to limit the present invention.
In detail, carbon nano-tube touch function layer 100 can comprise one drive circuit 130 further, and driving circuit 130 is connected to small part or whole driving sensing electrodes 120.In fact driving circuit 130 can be reached by various different component design and annexation, will illustrate a kind of enforcement aspect of circuit design below.But, the following description and be not used to limit the present invention.In addition, in the present embodiment, a so-called assembly only indicates a kind of and has certain function or the arrangement of components of character in carbon nano-tube touch function layer 100, but not represents the quantity of this assembly.That is, above-mentioned one drive circuit 130 can be only made up of single driving circuit 130, and single one driving circuit 130 can be connected to each driving sensing electrode 120 seriatim through designs such as suitable tupe or multiplexers.But, the quantity of driving circuit 130 also can be multiple, and each driving circuit 130 can connect a driving sensing electrode 120 one to one, or one-to-many ground connects multiple driving sensing electrode 120.In addition, the present embodiment is connected to a driving sensing electrode 120 to make the clear driving circuit 130 that only depicts of drawing, but in fact as shown in the above description, has at least several or whole driving sensing electrodes 120 can be connected to driving circuit 130.
In the present embodiment, driving circuit 130 comprises a ground unit 132 and one scan unit 134, wherein scanning element 134 comprises a charging circuit C, a storage circuit P and a reading circuit R, and wherein charging circuit C is in parallel with storage circuit P, and reading circuit R is connected to storage circuit P.
In addition, driving circuit 130 is such as provided with four change-over switches, and it is respectively interrupteur SW 1, interrupteur SW 2, interrupteur SW 3 and interrupteur SW 4.Whether conducting is to driving sensing electrode 120 in order to the charging circuit C in gated sweep unit 134, storage circuit P and reading circuit R for interrupteur SW 1.Further, in scanning element 134, whether interrupteur SW 2 is connected to interrupteur SW 1 in order to control charging circuit C, and interrupteur SW 3 is then in order to control storage circuit P and whether reading circuit R is connected to interrupteur SW 1.In addition, interrupteur SW 4 is arranged in ground unit 132 in order to control to drive sensing electrode 120 whether ground connection.
In the present embodiment, the type of drive of carbon nano-tube touch function layer 100 be such as step by step turntable driving sensing electrode 120 to receive by the signal of driving sensing electrode 120 scanned.At this, so-called step by step scanning refer to drive sensing electrode 120 can batch ground or one by one with scanning element 134 conducting.When one of them drives sensing electrode 120 and scanning element 134 conducting, other driving sensing electrode 120 all can with ground unit 132 conducting.In addition, scanning sequency of the present invention is not necessarily according to driving sensing electrode 120 arrangement position in space.For example, the driving sensing electrode 120 shown in Fig. 1 can by left and right, by right and a left side, one, interval, interval is multiple or scanned according to the order without ad hoc rules.
In detail, the driving sensing electrode 120 of carbon nano-tube touch function layer 100 such as sequential is electrode X1, electrode X2, electrode X3, electrode X4, electrode X5, electrode X6, electrode X7 and electrode X8.Under the design of the present embodiment, make electrode X3 and scanning element 134 conducting, then the interrupteur SW 1 in scanning element 134 needs conducting and interrupteur SW 4 in ground unit 132 needs to disconnect.In addition, when make electrode X3 and ground unit 132 conducting, then interrupteur SW 4 in ground unit 132 can conducting and interrupteur SW 1 in scanning element 134 can disconnect.At this, ground unit 132 is such as be connected to an earthing potential or the current potential fixed or an assembly for a high impedance.
For example, shown in Fig. 2 be one embodiment of the invention driving circuit in the drive waveforms schematic diagram of each change-over switch when scanning.Please refer to Fig. 2, in the waveform shown in Fig. 2, be from top to bottom sequentially the drive waveforms of interrupteur SW 1, interrupteur SW 2, interrupteur SW 3 and interrupteur SW 4.Time T1 is the time that scanning motion performs.In addition, in the present embodiment, interrupteur SW 1 ~ SW4 that in each drive waveforms, the time representation of high levle is corresponding is switched on (namely opening, turnon), the time of low level then represents that corresponding interrupteur SW 1 ~ SW4 is disconnected (namely closing, turnoff).
Referring to Fig. 1 and Fig. 2, in time T1, interrupteur SW 1 is switched on, and interrupteur SW 4 is disconnected.So corresponding driving sensing electrode 120 can with scanning element 134 conducting to carry out scanning and to sense.In addition, in time T1, interrupteur SW 2 will alternately one be switched on interrupteur SW 3, and another one is disconnected.In the present embodiment, interrupteur SW 2 time switched on interrupteur SW 3 is respectively T2 and T3, and after interrupteur SW 2 is disconnected, interrupteur SW 3 can postpone a period of time t1 and just be switched on.Thus, in time T1, corresponding driving sensing electrode 120 alternately will be connected to charging circuit C and storage circuit P.In one embodiment, time T1 is such as 20 microseconds (μ s), time T2 and time T3 is such as 0.3 microsecond, and time t1 is such as then 0.025 microsecond.But, with different type of drive, time T3 also can and then time T2, that is time t1 can be zero.In brief, the length of these times ought determine depending on factors such as the ability of driving circuit 130 and actual product sizes.
With the present embodiment, charging circuit C such as connects a voltage source (not shown), and storage circuit P then such as connects an external capacitive Cout.When electric paper display is touched with finger or conducting medium by user, between carbon nano-tube film 110 and finger (or conducting medium), a hand capacity can be produced.Now, charging circuit C and storage circuit P alternately will carry out discharge and recharge to hand capacity.Reading circuit R just can read the charge volume of hand capacity in time T1, such as magnitude of voltage, using the basis for estimation as touch position.In the present embodiment, above-mentioned design is only a kind of practice mode of driving circuit 130.In other embodiments, driving circuit 130 can be made up of other functional unit.That is, every can being connected to drives sensing electrode 120 can become the topological design of driving circuit 130 with the circuit design determining hand capacity.
Continue referring to Fig. 1, in a simulation test, contact area that touch action causes each time is such as preset as 5mm × 5mm, and external capacitive Cout set in storage circuit P is such as 100pf.In addition, the emulation of nine touch position will be carried out in this simulation test, and the central point of these touch position is such as position I ~ position IX, wherein position I ~ position III aligning electrodes X4, position IV ~ position VI is offset towards electrode X5 by position I ~ position III respectively, and position VII ~ position IX is offset towards electrode X5 by position IV ~ position VI respectively.And in this experiment, the distance of position VII ~ between position IX and electrode X4 is set equal to the distance of position VII ~ between position IX and electrode X5.
Under simulation test shown in Fig. 3 to Fig. 5, the signal received by electrode X3 to X6.Please first simultaneously with reference to Fig. 1 and Fig. 3, the carbon nano-tube film 110 of the present embodiment has impedance anisotropy, so the path transmission of electric current mainly will be parallel to comparatively Low ESR direction D.When position I is touched, signal received by electrode X3 ~ X6 (namely reading circuit R read voltage) is in fact as shown in Fig. 3 middle polyline 310.When position II and position III is touched, the signal received by electrode X3 ~ X6 is then respectively if Fig. 3 middle polyline 320 is with shown in broken line 330.
Though position I ~ position III similarly aligning electrodes X4, can produce different signals, when wherein position III is touched, the signal received by electrode X4 is minimum.In this emulation, when touch position I ~ IX is nearer with the distance of driving sensing electrode 120, the corresponding signal received by driving sensing electrode 120 is larger.So, carbon nano-tube touch function layer 100 can the numerical values recited of signal that receives of self-driven sensing electrode 120 to judge that touch position is compared with the coordinate on the D of Low ESR direction.
Then, please refer to Fig. 4, broken line 340 ~ broken line 360 is sequentially the signal that when touch position is positioned at position IV ~ position VI, electrode X3 receives to electrode X6.Because position IV ~ position VI offsets towards electrode X5 relative to position I ~ position III respectively, electrode X4 and electrode X5 can carry out the action of discharge and recharge to hand capacity.But, the signal touched a little when position IV ~ position VI received by electrode X4 can higher than the signal received by electrode X5.
Similarly, please refer to Fig. 5, broken line 370 ~ broken line 390 is sequentially the signal that when touch position is positioned at position VII ~ position IX, electrode X3 receives to electrode X6.At this, touch position be positioned at position VII ~ position IX wherein one time, electrode X4 can receive identical signal in fact with electrode X5.From the signal relation of Fig. 3 to Fig. 5, to judge the coordinate of touch position at higher resistance direction H, can the signal of more adjacent three drivings received by sensing electrode 120.For example, judge the coordinate of touch position at higher resistance direction H, can take out adjacent three drives in signal received by sensing electrode 120, both signal value higher, and the signal value both this is obtained corresponding coordinate figure with interpolation or with a proportionate relationship addition.Proportionate relationship described herein can determine based on the change of signal value received in simulation process.
Specifically, after carbon nano-tube touch function layer 100 completes, l-G simulation test can be carried out in the hope of the variation relation of the signal received by each driving sensing electrode 120 corresponding to different touch position according to required resolution in each position.This relation is built on and drives in sensor chip when namely can be used as the carbon nano-tube of user's practical operation in the future touch function layer 100, judge the foundation of touch position.
The carbon nano-tube film 110 of the present embodiment has impedance anisotropy, makes the signal received by each driving sensing electrode 120 directly can reflect the distance of touch position.Therefore, carbon nano-tube touch function layer 100 has and preferably senses accuracy.In addition, carbon nano-tube touch function layer 100 by the numerical value directly reading electrode Received signal strength and the numerical value comparing adjacent electrode received signal to make touch position, can not need complicated driving method and calculation program.Generally, the carbon nano-tube touch function layer 100 of the present embodiment proposition is simple with structure, sensing accuracy is high and the easy feature of driving method.
This functional layer 20 can comprise an anti-glare layer 200 further, and this carbon nano-tube touch function layer 100 can be arranged between this anti-glare layer 200 and this first bonding coat 30, and this anti-glare layer 200 directly covers this carbon nano-tube film 110.This anti-glare layer 200 comprises primary antibodie anti-glare substrate and is arranged at the anti-glare film of this anti-glare upper surface of substrate.This anti-glare film contains particle, and this anti-glare film surface has the meticulous irregularity formed by the coalescent of this particle or its analog.The material of this anti-glare substrate can be transparent plastic, as tri acetyl cellulose (TAC), polyester (TPEE), polyethylene terephthalate (PET), polyimide (PI), polyamide (PA), aromatic poly amide, tygon (PE), polyacrylate (PAR), polyethersulfone, polysulfones, polypropylene (PP), diacetyl cellulose, Polyvinylchloride, acrylic resin (PMMA), polycarbonate (PC), epoxy resin, carbamide resin, carbamate resins and melamine resin.The thickness of this anti-glare substrate can be 20 microns to 100 microns, but is not limited to this scope.This anti-glare film contains described particle and resin.In addition, this anti-glare film optionally can comprise further as adjuvants such as light stabilizer, ultraviolet light absorber, antistatic agent, fire retardant, antioxidants.This particle is mainly coalescent on the copline direction of anti-glare film, coalescent to take this forming two dimension, thus can produce on the surface continuously at anti-glare film and relax the meticulous irregularity of fluctuation, therefore the desirable level of anti-glare characteristic and contrast can be met simultaneously.It is 0.05 micron to 0.5 micron at the arithmetic average roughness Ra of observed the on the surface roughness curve of anti-glare film.The arithmetic average roughness Ra of roughness curve is less than 0.05 micron can make anti-glare characteristic degrades, and contrast can be made to demote more than 0.5 micron.
In the present embodiment, described carbon nano-tube film 110 is set directly at the lower surface of the anti-glare substrate of this anti-glare layer 200.This first bonding coat 30 directly contacts with this carbon nano-tube film 110 and bonds, thus this anti-glare layer 200, this carbon nano-tube film 110 is fixedly connected with this electric pole plate 620.
This electronic-paper display screen 10 is existing electrophoretic display panel, can be but be not limited to the one in microcapsules (micro-capsule) type electrophoretic display panel, micro-cup (microcupelectrophoretic) type electrophoretic display panel, screw (gyriconbead) type electrophoretic display panel, dividing plate (partition) type electrophoretic display panel.
This electronic-paper display screen 10 comprises lower electrode plate 610, electrophoretic display medium layer 630 and electric pole plate 620 from bottom to up successively.This electrophoretic display medium layer 630 is arranged between this electric pole plate 620 and lower electrode plate 610.This electric pole plate 620 comprises upper substrate 622 and is arranged at the common electrode layer 624 of lower surface of this upper substrate 622, and this lower electrode plate 610 comprises infrabasal plate 612 and is arranged at the pixel electrode layer 614 of upper surface of this infrabasal plate 612.This electrophoretic display medium layer 630 contacts and is fitted between this common electrode layer 624 and pixel electrode layer 614.The upper surface of this upper substrate 622 is the display surface of electronic-paper display screen 10.
This electric pole plate 620, electrophoretic display medium layer 630 and lower electrode plate 610 form display layer jointly.Upper substrate 622 and the material of the infrabasal plate 612 of this lower electrode plate 610 of this electric pole plate 620 can be transparent hard material or flexible material, as glass, quartz, plastics or resin, and can be identical with the material of the anti-glare substrate of described anti-glare layer 200.The common electrode layer 624 of this electric pole plate 620 has good transparency and electric conductivity, and material can be tin indium oxide (ITO), conducting polymer or carbon nanotube layer.This carbon nanotube layer comprises multiple equally distributed carbon nano-tube, and the plurality of carbon nano-tube can lack of alignment or be arranged of preferred orient along equidirectional.The pixel electrode layer 614 of this lower electrode plate 610 comprises multiple film crystal pipe electrode.This electrophoretic display medium layer 630 can comprise bistable electric ink display medium.In microcapsule-type electrophoretic display panel, this electrophoretic display medium layer 630 comprises microcapsules formula electrophoretic display medium, and this electrophoretic display medium layer 630 comprises multiple microcapsules, is packaged with some first electrophoresis ions and the second electrophoresis ion in each microcapsules.When being added with voltage between described common electrode layer 624 and pixel electrode layer 614, these microcapsules show under electric field action.All can be combined by cementing agent between this electrophoretic display medium layer 630 with this pixel electrode layer 614 and common electrode layer 624.This electronic-paper display screen 10 can comprise display drive circuit (not shown) further, for this common electrode layer 624 and pixel electrode layer 614 provide voltage driven.
In use, the display of the electronic-paper display screen 10 that user's visual confirmation is arranged below carbon nano-tube touch function layer 100, while by touch objects, the upper surface touching this touch type electronic paper display 500 as finger operates.This carbon nano-tube touch function layer 100 and this electronic-paper display screen 10 all need input electrical signal to drive.Because this carbon nano-tube touch function layer 100 relies on the hand capacity between sensing finger and carbon nano-tube film 110 to judge the position of touch point, and the common electrode layer 624 of this electronic-paper display screen 10 upper end operationally can produce a larger background capacitance, the sensing of carbon nano-tube touch function layer 100 pairs of touch point electric capacity is affected.For addressing this problem, can make, between the common electrode layer 624 of this electronic-paper display screen 10 and this carbon nano-tube touch function layer 100, there is effective spacing distance, this distance matches with the capacitance sensing characteristic of this carbon nano-tube film 110, makes carbon nano-tube touch function layer 100 effectively can tell the surface capacitance of touch point generation from background capacitance.Particularly, distance between the common electrode layer 624 of this electronic-paper display screen 10 and this carbon nano-tube touch function layer 100 should be greater than 100 microns, the upper limit of this distance is not limit, wider scope can be had, as long as make this touch type electronic paper display 500 meet practical thickness, and there is suitable penetrability, such as, the distance between the common electrode layer 624 of this electronic-paper display screen 10 and this carbon nano-tube touch function layer 100 can be less than or equal to 2 millimeters.This distance is preferably 125 microns to 800 microns.For meeting this requirement, the present embodiment is realized by the thickness arranging the upper substrate 622 of this electronic-paper display screen 10, and such as, the thickness of the upper substrate 622 of this electronic-paper display screen 10 is greater than 100 microns and is less than or equal to 800 microns.
This first bonding coat 30 is arranged between this functional layer 20 and this electric pole plate 620, is specifically arranged at the upper surface of this upper substrate 622, for this functional layer is fixed on this electric pole plate 620.The material of this first bonding coat 30 is transparent OCA optical cement or UV glue etc.
Refer to Fig. 9, second embodiment of the invention provides a kind of touch type electronic paper display 510, and it comprises electronic-paper display screen 10, first bonding coat 30 and functional layer 20 from bottom to up successively.The structure of this touch type electronic paper display 510 is substantially identical with the touch type electronic paper display 500 of this first embodiment, and its difference is in this functional layer 20.This functional layer 20 comprises transparent insulation wall 190, carbon nano-tube touch function layer 100 and an anti-glare layer 200 from bottom to up successively.This transparent insulation wall 190 has a upper surface and a lower surface, the carbon nano-tube film 110 of this carbon nano-tube touch function layer 100 is arranged at the upper surface of this transparent insulation wall 190, and this first bonding coat 30 is arranged at the lower surface of this transparent insulation wall 190.This transparent insulation wall 190 is arranged between this electronic-paper display screen 10 and this carbon nano-tube touch function layer 100.
The material of this transparent insulation wall 190 can be transparent hard material or flexible material, as glass, quartz, plastics or resin, and can be identical with the material of the anti-glare substrate of described anti-glare layer 200.In the present embodiment, the material of this transparent insulation wall 190 is polycarbonate (PC).The thickness of this transparent insulation wall 190 is greater than 100 microns and is less than or equal to 800 microns, thus makes to have enough large distance between this carbon nano-tube touch function layer 100 and common electrode layer 624 of this electronic-paper display screen 10.
Refer to Figure 10, third embodiment of the invention provides a kind of touch type electronic paper display 520, and it comprises electronic-paper display screen 10, first bonding coat 30 and functional layer 20 from bottom to up successively.The structure of this touch type electronic paper display 520 is substantially identical with the touch type electronic paper display 510 of this second embodiment, and its difference is in this functional layer 20.This functional layer 20, except comprising transparent insulation wall 190, carbon nano-tube touch function layer 100 and anti-glare layer 200, also comprises waterproof gas-bearing formation 410 further.
This waterproof gas-bearing formation 410 between can be arranged in this transparent insulation wall 190, carbon nano-tube touch function layer 100 and anti-glare layer 200 two-layer, or is arranged between this transparent insulation wall 190 and this electronic-paper display screen 10.The material transparent of this waterproof gas-bearing formation 410 and aqueous vapor can be stoped to pass through, be specifically as follows rubber, fluororesin (fluororesin), polychlorotrifluoroethylene (polychlorotrifluoroethylene, PCTFE) or poly-trifluoro-ethylene (polytrifluoroethylene).The thickness of this waterproof gas-bearing formation 410 can be 0.5 millimeter to 0.05 millimeter, is preferably 0.1 millimeter.This aqueous vapor can be water vapour or moisture.
Further, this functional layer 20 can comprise one second bonding coat 400 further.The material of this second bonding coat 400 is identical with the material of this first bonding coat 30.This second bonding coat 400 is between can be arranged in this transparent insulation wall 190, carbon nano-tube touch function layer 100, anti-glare layer 200 and waterproof gas-bearing formation 410 two-layer.
In the present embodiment, this functional layer 20 comprises waterproof gas-bearing formation 410, transparent insulation wall 190, carbon nano-tube touch function layer 100,1 second bonding coat 400 and an anti-glare layer 200 from bottom to up successively.This transparent insulation wall 190 has a upper surface and a lower surface, the carbon nano-tube film 110 of this carbon nano-tube touch function layer 100 is arranged at the upper surface of this transparent insulation wall 190, and this waterproof gas-bearing formation 410 is arranged at the lower surface of this transparent insulation wall 190.This second bonding coat 400 is arranged between this anti-glare layer 200 and this carbon nano-tube film 110, and is combined with the anti-glare substrate of this anti-glare layer 200 by this carbon nano-tube film 110.
The touch type electronic paper display of the present invention has carbon nano-tube touch function layer, because carbon nano-tube material and the thin characteristic of layer and the problem of the metal solved on known touch-screen or ITO circuit stop portions light, moreover, because the carbon nano tube line in carbon nano-tube film has impedance anisotropy and spacing is fine and closely woven, therefore the sensing precision of electric paper display can be significantly improved.Further, owing to having enough spacing distances between the common electrode layer of this electronic-paper display screen and this carbon nano-tube touch function layer, thus the work because of this electronic-paper display screen 10 is avoided to cause background capacitance excessive and have an impact to the sensing of touch point electric capacity.
In addition, those skilled in the art also can do other change in spirit of the present invention, and certainly, these changes done according to the present invention's spirit, all should be included within the present invention's scope required for protection.
Claims (17)
1. a touch type electronic paper display, comprise an electronic-paper display screen and a functional layer, this electronic-paper display screen comprises a common electrode layer, and there is a display surface, this functional layer is arranged at this display surface, it is characterized in that, described functional layer comprises a carbon nano-tube touch function layer further, described carbon nano-tube touch function layer is arranged on this display surface, this carbon nano-tube touch function layer is single layer structure, comprise carbon nano-tube film and multiple driving sensing electrode, this carbon nano-tube film has impedance anisotropy, comprise a Low ESR direction and a high impedance direction, the plurality of driving sensing electrode is electrically connected with this carbon nano-tube film, be arranged on the side that this carbon nano-tube film is parallel to this high impedance direction, thus realize the function of sensing touch position, distance between this common electrode layer and this carbon nano-tube touch function layer is greater than 100 microns and is less than or equal to 2 millimeters.
2. touch type electronic paper display as claimed in claim 1, it is characterized in that, this electronic-paper display screen comprises lower electrode plate, electrophoretic display medium layer and electric pole plate, this electrophoretic display medium layer is arranged between this electric pole plate and lower electrode plate, this electric pole plate comprises upper substrate and is arranged at the described common electrode layer of lower surface of this upper substrate, this lower electrode plate comprises infrabasal plate and is arranged at the pixel electrode layer of upper surface of this infrabasal plate, and the thickness of this upper substrate is greater than 100 microns and is less than or equal to 800 microns.
3. touch type electronic paper display as claimed in claim 1, it is characterized in that, described functional layer comprises a transparent insulation wall further, this transparent insulation wall is arranged between this electronic-paper display screen and this carbon nano-tube touch function layer, and the thickness of this transparent insulation wall is greater than 100 microns and is less than or equal to 800 microns.
4. touch type electronic paper display as claimed in claim 3, it is characterized in that, the material of this transparent insulation wall is glass, quartz, plastics or resin.
5. touch type electronic paper display as claimed in claim 4, it is characterized in that, the material of this transparent insulation wall is polycarbonate.
6. touch type electronic paper display as claimed in claim 3, it is characterized in that, described functional layer comprises an anti-glare layer further, and described carbon nano-tube touch function layer is arranged between described anti-glare layer and described electronic-paper display screen.
7. touch type electronic paper display as claimed in claim 6, it is characterized in that, described functional layer comprises a waterproof gas-bearing formation further, this waterproof gas-bearing formation between to be arranged in this transparent insulation wall, carbon nano-tube touch function layer and anti-glare layer two-layer arbitrarily, or is arranged between this transparent insulation wall and this electronic-paper display screen.
8. touch type electronic paper display as claimed in claim 7, it is characterized in that, described functional layer comprises one second bonding coat further, and this second bonding coat is between to be arranged in this transparent insulation wall, carbon nano-tube touch function layer, anti-glare layer and waterproof gas-bearing formation two-layer arbitrarily.
9. touch type electronic paper display as claimed in claim 1, it is characterized in that, the ratio in described high impedance direction and Low ESR direction is 50 ~ 500.
10. touch type electronic paper display as claimed in claim 1, it is characterized in that, described carbon nano-tube film comprises multiple carbon nano-tube, and the plurality of carbon nano-tube extends along this Low ESR direction substantially.
11. touch type electronic paper display as claimed in claim 1, is characterized in that, respectively this driving sensing electrode is between 1mm to 8mm along the length in this high impedance direction.
12. touch type electronic paper display as claimed in claim 1, is characterized in that, those drive the spacing of sensing electrode to be between 3mm to 5mm.
13. touch type electronic paper display as claimed in claim 1, is characterized in that, comprise at least one driving circuit further, are connected at least those driving sensing electrodes of part, to scan at least those driving sensing electrodes of part step by step.
14. touch type electronic paper display as claimed in claim 13, it is characterized in that, this driving circuit comprises a ground unit and one scan unit, is connected to this scanning element when respectively this driving sensing electrode is scanned, and is not connected to this ground unit by during scanning.
15. touch type electronic paper display as claimed in claim 14, it is characterized in that, this scanning element comprises a charging circuit, a storage circuit and a reading circuit, and this charging circuit is in parallel with this storage circuit, and this reading circuit is connected to this storage circuit.
16. touch type electronic paper display as claimed in claim 13, it is characterized in that, the quantity of this driving circuit is multiple, and each driving circuit connects one one to one and drives sensing electrode, or one-to-many ground connects multiple driving sensing electrode.
17. touch type electronic paper display as claimed in claim 1, it is characterized in that, when this touch type electronic paper display is touched, touch position is nearer with the distance of driving sensing electrode, the corresponding signal received by driving sensing electrode is larger, and the numerical values recited of the signal that the self-driven sensing electrode of carbon nano-tube touch function layer receives is to judge the coordinate of touch position on this Low ESR direction.
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| CN101989136B (en) * | 2009-08-07 | 2012-12-19 | 清华大学 | Touch screen and display device |
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Effective date of registration: 20210425 Address after: Electronic Information Industrial Park, Gui'an New District, Guiyang City, Guizhou Province Patentee after: Guizhou Funa Yuanchuang Technology Co.,Ltd. Patentee after: Shih Hua Technology Ltd. Address before: 300457 Tianjin Binhai New Area Haiyun Tianjin economic and Technological Development Zone No. 80 Building No. 15 Street Patentee before: TIANJIN FUNAYUANCHUANG TECHNOLOGY Co.,Ltd. Patentee before: Shih Hua Technology Ltd. |