CN103592788B - Touch LCD screen - Google Patents
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- CN103592788B CN103592788B CN201310490033.4A CN201310490033A CN103592788B CN 103592788 B CN103592788 B CN 103592788B CN 201310490033 A CN201310490033 A CN 201310490033A CN 103592788 B CN103592788 B CN 103592788B
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Abstract
The present invention relates to a kind of touch LCD screen, this touch LCD screen includes a touch screen, a transparency conducting layer in this touch screen is carbon nanotube layer, this carbon nanotube layer includes that the most of CNTs in some CNTs, and these some CNTs are arranged of preferred orient in the same direction.This carbon nanotube layer has conduction anisotropy, but also has polarisation effect, and therefore, this carbon nanotube layer acts not only as the transparency conducting layer of this touch screen, and doubles as the first polaroid of this touch LCD screen.The first matrix in this touch screen doubles as the upper matrix of upper substrate.
Description
This case is Application No. 201010187834.X filed in 31 days Mays in 2010, the division of the Chinese invention patent application of entitled " touch LCD screen ".
Technical field
The present invention relates to a kind of LCDs, particularly relate to a kind of touch LCD screen.
Background technology
Liquid crystal display because low-power consumption, miniaturization and high-quality display effect, becomes one of optimal display mode.In recent years, along with high performance and the diversified development of the various electronic equipments such as mobile phone, touch navigation system, integrated computer display and interactive TV, the electronic equipment of the touch screen that the display surface in LCDs installs light transmission is gradually increased.The user of electronic equipment passes through touch screen, and the display content of the LCDs being pointed to the touch screen back side carries out visual confirmation, operates while utilizing the mode such as finger or pen to press touch screen.Thus, it is possible to operate with the various functions of the electronic equipment of this LCDs.
But, the LCDs of existing use capacitance touch screen includes a capacitance touch screen, one first polaroid, one second matrix, one first both alignment layers, liquid crystal layer, one second both alignment layers, a thin film transistor (TFT) template and one second polaroid the most successively.Described capacitance touch screen can be single-point type or multipoint mode, commonly uses as a example by projection-type capacitive touch screen by multi-point capacitive touch screen, and it generally comprises one first matrix, one first indium tin oxide (Indium from outside to inside
Tin Oxide, ITO) layer (calling ITO layer in the following text), one second matrix, one second ITO layer, this second ITO layer contacts setting with described first polaroid.As can be seen here, touch screen is integrated in LCDs and necessarily makes the thickness of LCDs increase, complicated structure, it is unfavorable for miniaturization and the development of slimming of the electronic equipment of LCDs and application LCDs.
In view of this, a kind of touch liquid crystal display of necessary offer, this touch liquid crystal display has relatively thin thickness, and structure is simpler.
Summary of the invention
In view of this, necessary offer is a kind of has the relatively thin thickness of ratio, touch LCD screen relatively simple for structure.
A kind of touch LCD screen includes the most successively: a capacitive touch screen, this capacitive touch screen includes one first matrix and a transparency conducting layer, this transparency conducting layer is arranged at the upper surface of this first matrix, this transparency conducting layer is conduction anisotropy layer, this conduction anisotropy layer is a carbon nanotube layer, this carbon nanotube layer includes that the preferred orientation in the same direction of the CNT in multiple CNT, and this carbon nanotube layer extends；One upper substrate, this upper substrate includes one first polaroid, matrix on, electrode and one first both alignment layers on one the most successively, and wherein, described first polaroid is described carbon nanotube layer, and described upper matrix is described first matrix；One liquid crystal layer；And an infrabasal plate, this infrabasal plate includes one second both alignment layers, a thin-film transistor display panel and one second polaroid the most successively.
A kind of touch LCD screen includes the most successively: a capacitive touch screen, this capacitive touch screen includes the most successively: one second transparency conducting layer, one second matrix, one first transparency conducting layer and one first matrix；One upper substrate, this upper substrate includes one first polaroid, matrix on, electrode and one first both alignment layers on one the most successively；One liquid crystal layer；And an infrabasal plate, this infrabasal plate includes one second both alignment layers, a thin-film transistor display panel and one second polaroid the most successively；Wherein, a transparency conducting layer in described first transparency conducting layer and the second transparency conducting layer is conduction anisotropy layer, this electric anisotropy layer is a carbon nanotube layer, this carbon nanotube layer includes multiple CNT, and the preferred orientation in the same direction of the CNT in this carbon nanotube layer extends, another transparency conducting layer includes that multiple spaced conductive structure, described first polaroid are described carbon nanotube layer, and described upper matrix is described first matrix.
Compared with prior art, the touch LCD screen that the present invention provides uses carbon nanotube layer to serve not only as the transparency conducting layer of touch screen, and double as the first polaroid of this touch LCD screen, the first matrix in described capacitive touch screen doubles as the upper matrix of described upper substrate, therefore, this touch LCD screen has simple structure and relatively thin thickness, simplifies manufacturing process, reduces manufacturing cost.
Accompanying drawing explanation
Fig. 1 is the generalized section of the touch LCD screen that first embodiment of the invention provides.
Fig. 2 is the schematic top plan view of the touch screen in Fig. 1.
Fig. 3 is the stereoscan photograph of the CNT membrane that the transparency conducting layer in Fig. 1 uses.
Fig. 4 is the generalized section of the touch LCD screen that second embodiment of the invention provides.
Fig. 5 is the schematic top plan view of the touch screen in Fig. 4.
Main element symbol description
| Touch LCD screen | 10；20 |
| Touch screen | 110；210 |
| First matrix | 112；211 |
| Transparency conducting layer | 114 |
| First electrode | 115；216 |
| Second electrode | 116；218 |
| Protective clear layer | 118；215 |
| Upper substrate | 120；220 |
| First both alignment layers | 122；222 |
| Upper electrode | 124；224 |
| Infrabasal plate | 130；230 |
| Second both alignment layers | 132；232 |
| Thin-film transistor display panel | 134；234 |
| Second polaroid | 136；236 |
| Liquid crystal layer | 140；240 |
| First transparency conducting layer | 212 |
| Second matrix | 213 |
| Second transparency conducting layer | 214 |
Following detailed description of the invention will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Detailed description of the invention
Below in conjunction with the accompanying drawings and the specific embodiments, the touch LCD screen provided the present invention is described in further detail.
Referring to Fig. 1, first embodiment of the invention provides a kind of touch LCD screen 10.This touch LCD screen 10 is comprising: touch screen 110, upper substrate 120, infrabasal plate 130 and a liquid crystal layer 140.Wherein, described touch screen 110 is arranged at the upper surface of this upper substrate 120；Described infrabasal plate 130 is oppositely arranged with described upper substrate 120；Described liquid crystal layer 140 is arranged between described upper substrate 120 and described infrabasal plate 130.In this manual, " on ", D score only refer to relative orientation, " on " refer to the direction of touch-surface near touch LCD screen, D score then refers to the direction of the touch-surface away from touch LCD screen.
Seeing also Fig. 2, described touch screen 110 is a surface capacitance type touch screen, and this touch screen 110 includes 114, two the first electrodes of one first matrix 112, transparency conducting layer 115, two second electrodes 116 and protective clear layers 118.Wherein, described transparency conducting layer 114 is arranged at the upper surface of described first matrix 112；Said two the first electrode 115 and two the second electrodes 116 electrically connect with described transparency conducting layer 114；Described protective clear layer 118 can be set directly at the upper surface of described transparency conducting layer 114, is used for protecting this transparency conducting layer 114.
Described upper substrate 120 includes electrode 124 and one first both alignment layers 122 on transparency conducting layer 114,1 first matrix 112, the most successively.Wherein, described upper electrode 124 is arranged at the lower surface of described first matrix 112.Described first both alignment layers 122 is arranged at the lower surface of described upper electrode 124, arranges near liquid crystal layer 140.Further, the lower surface of this first both alignment layers 122 can include multiple the first parallel groove, for making the liquid crystal molecule of liquid crystal layer 140 align.
Wherein, transparency conducting layer 114 in described touch screen 110 also doubles as the first polaroid of described upper substrate 120, described first matrix 112 is both as the matrix of described touch screen 110, again as the upper matrix of described upper substrate 120, therefore, described touch LCD screen 10 has relatively thin thickness and simple structure, simplify manufacturing process, reduce manufacturing cost, improve the utilization rate of backlight, improve display quality.
Described liquid crystal layer 140 includes the liquid crystal molecule that multiple length is bar-shaped.The liquid crystal material of described liquid crystal layer 140 is liquid crystal material commonly used in the prior art.The thickness of described liquid crystal layer 140 1 ~ 50 micron, in the present embodiment, the thickness of liquid crystal layer 140 is 5 microns.
Described infrabasal plate 130 includes one second both alignment layers 132, thin-film transistor display panel 134 and one second polaroid 136 the most successively.This second both alignment layers 132 is arranged on the upper surface of this thin-film transistor display panel 134, arranges near described liquid crystal layer 140.Further, the upper surface of the second both alignment layers 132 can include multiple the second parallel groove, and the orientation of this second groove is vertical with the orientation of the first groove of described first both alignment layers 122.This second polaroid 136 is arranged on the lower surface of this thin-film transistor display panel 134.
It is appreciated that the demand according to various functions, between above layers, the most optionally inserts other extra layers.
Described first matrix 112 is transparent thin film or thin plate.The material of this first matrix 112 can be the hard materials such as glass, quartz or diamond.Described first matrix 112 acts primarily as the effect of support.When in flexible touch screen, the material of this first matrix 112 is alternatively the flexible material such as plastics or resin.Specifically, this material used by the first matrix 112 can be the materials such as the polyester materials such as Merlon (PC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), or polyether sulfone (PES), cellulose esters, polrvinyl chloride (PVC), benzocyclobutene (BCB) or acrylic resin.The thickness of this first matrix 112 is 1 millimeter ~ 1 centimetre.In the present embodiment, the material of this first matrix 112 is glass, and thickness is 5 millimeters.It is appreciated that the material forming the first matrix 112 is not limited to the above-mentioned material enumerated, as long as described first matrix 112 can be made to have preferable transparency, plays the effect of support.
Transparency conducting layer 114 in described touch screen 110 is a carbon nanotube layer.Carbon nanotube layer is a resistance anisotropy layer.Described carbon nanotube layer includes multiple CNT, and the plurality of CNT is arranged of preferred orient in the same direction so that carbon nanotube layer at a resistance in direction less than the resistance in other directions.In this carbon nanotube layer, the bearing of trend of most of CNTs is basically parallel to the surface of this carbon nanotube layer, and the resistivity on CNT bearing of trend is less than the resistivity on other directions, preferably, the ratio of the resistivity in described carbon nanotube layer resistivity on CNT bearing of trend and other directions is less than or equal to more than 2 times that 1:2, the i.e. carbon nanotube layer electrical conductivity on CNT bearing of trend is other directions.Described carbon nanotube layer includes at least one CNT membrane.Wherein, when described carbon nanotube layer includes multiple CNT membrane, this CNT membrane stacking is arranged or parallel gapless is laid and arranged, and the most of CNTs in the plurality of CNT membrane are arranged of preferred orient the most in the same direction, the orientation of the most adjacent CNT in CNT membrane is basically identical.In the present embodiment, described carbon nanotube layer is a CNT membrane, and the most described transparency conducting layer 114 is made up of a CNT membrane.The thickness of described carbon nanotube layer does not limits, and can select as required；The thickness of described carbon nanotube layer is 0.5 nanometer ~ 100 micron；Preferably, the thickness of this carbon nanotube layer is 100 nanometer ~ 200 nanometers.
Refer to Fig. 3, the self supporting structure that described CNT membrane is made up of some CNTs.Described some CNTs are for be arranged of preferred orient in the same direction.Described preferred orientation refers to that the overall bearing of trend of most of CNTs is the most in the same direction in CNT membrane.And, the overall bearing of trend of described most of CNTs is basically parallel to the surface of CNT membrane.Further, in described CNT membrane, most CNTs are to be joined end to end by Van der Waals force.Specifically, in the most of CNTs extended the most in the same direction in described CNT membrane, each CNT is joined end to end by Van der Waals force with the most adjacent CNT.Certainly, there is the CNT of minority random alignment in described CNT membrane, the overall orientation of CNTs most of in CNT membrane will not be arranged to make up significantly affecting by these CNTs.Described self-supporting is that CNT membrane need not large-area carrier supported, as long as and relatively both sides provide the support force can be the most unsettled and keep self membranaceous state, will this CNT membrane be placed in (or being fixed on) keep at a certain distance away arrange two supporters on time, the CNT membrane between two supporters can the membranaceous state of unsettled holding self.Described self-supporting mainly by CNT membrane exists continuously through Van der Waals force join end to end extend arrangement CNT and realize.
Specifically, the most CNTs extended the most in the same direction in described CNT membrane, and nisi linearity, bending that can be suitable；Or not arrange fully according on bearing of trend, deviation bearing of trend that can be suitable.Part contact is there may be between CNT arranged side by side in the most CNTs extended the most in the same direction of CNT membrane it is thus impossible to get rid of.
Specifically, described CNT membrane includes CNT fragment that is multiple continuous and that align.The plurality of CNT fragment is joined end to end by Van der Waals force.Each CNT fragment includes that multiple CNT being parallel to each other, the plurality of CNT being parallel to each other are combined closely by Van der Waals force.This CNT fragment has arbitrary length, thickness, uniformity and shape.CNT in this CNT membrane is arranged of preferred orient in the same direction.
Pulling from carbon nano pipe array and obtain the concrete grammar of described CNT membrane and include: (a) be a selected CNT fragment from described carbon nano pipe array, the present embodiment is preferably to use has the adhesive tape of one fixed width or adherent base bar contacts this carbon nano pipe array with a selected CNT fragment with one fixed width；B () by this stretching tool mobile, pulls this selected CNT fragment with certain speed, thus end to end pull-out multiple CNT fragment, and then form a continuous print CNT membrane.The plurality of CNT makes this CNT fragment have one fixed width the most side by side.While edge pulls the growth substrate that direction progressively disengages carbon nano pipe array to this chosen CNT fragment under a stretching force, due to van der Waals interaction, other CNT fragment adjacent with this selected CNT fragment is the most one after the other drawn out, thus is formed one continuously, uniformly and have the CNT membrane of one fixed width and preferred orientation.
Described CNT membrane has an electrical impedance of minimum at draw direction, and has maximum resistance resist being perpendicular to draw direction, thus possesses electrical impedance anisotropy, i.e. conducts electricity anisotropy.
The structure of described CNT membrane refers in disclosed in 13 days Augusts in 2008, the Chinese invention patent application Publication Specification of Publication No. CN101239712A.Owing to the CNT in this CNT membrane has good pliability so that this CNT membrane has good pliability, arbitrary shape can be become to be not easily broken with bending fold；Therefore, described carbon nanotube layer also has preferable pliability, so that use the touch screen 110 of this carbon nanotube layer producing transparent conductive layer to have preferable ruggedness, and then the touch LCD screen 10 using this touch screen 110 is made to have preferable ruggedness.
This carbon nanotube layer has a preferable transmittance, and the visible light transmissivity of single-layer carbon nano-tube membrane is more than 85%, and in this carbon nanotube layer, the number of plies of CNT membrane does not limits, as long as preferable transmittance can be had.
It addition, described carbon nanotube layer may further include reinforcing material, this reinforcing material is uniformly distributed in described some CNTs, thus forms a CNT composite bed.Specifically, this CNT is compound includes at least one CNT membrane and described reinforcing material, and this reinforcing material is uniformly distributed in the gap between the CNT in this at least one CNT membrane.Wherein, described reinforcing material can be a macromolecular material or metal material.Described macromolecular material is a transparent polymer material, its concrete material does not limits, and can be polystyrene, polyethylene, Merlon, polymethyl methacrylate (PMMA), Merlon (PC), ethylene glycol terephthalate (PET), phenylpropyl alcohol cyclobutane (BCB) or polycyclic alkene etc..Described metal material is the metal materials such as nickel, gold, platinum, ferrum, cobalt or copper.
It is appreciated that described carbon nanotube layer can also include the CNT membrane through overetch or laser treatment.This CNT membrane forms multiple laser cut line through laser treatment on its surface, thus further enhances this CNT stacking conduction anisotropy.
Owing to described transparency conducting layer 114 is a carbon nanotube layer, CNT in this carbon nanotube layer to the absorption of electromagnetic wave close to absolute black body, CNT all has a homogeneous absorption characteristic for the electromagnetic wave of various wavelength, therefore described transparency conducting layer 114 also has homogeneous polarization absorption performance for the electromagnetic wave of various wavelength.And, owing to the CNT in this transparency conducting layer 114 arranges the most in the same direction, when light wave incidence, direction of vibration is parallel to the light in length of carbon nanotube direction and is absorbed, it is perpendicular to the light-transmissive in length of carbon nanotube direction, so transmission light becomes line polarized light.Therefore, this transparency conducting layer 114 not only has the effect of conduction, also there is the polarisation effect of polaroid, can be as the first polaroid, upper substrate 120 is without additionally increasing polaroid, thus touch LCD screen 10 can be made to have relatively thin thickness, simplifies structure and the manufacturing cost of touch LCD screen 10, and improve the utilization rate of backlight, improve display quality.
In described touch screen 110, said two the first electrode 115 is disposed on described transparency conducting layer 114 two ends in the first direction or the first matrix 112 two ends in the first direction, electrically connect with described transparency conducting layer 114, described first direction i.e. X-direction shown in Fig. 2, this first direction is arranged essentially parallel to the bearing of trend of most of CNT；Said two the second electrode 116 is disposed on described transparency conducting layer 114 two ends in a second direction or the first matrix 112 two ends in a second direction, electrically connects with described transparency conducting layer 114, described second direction i.e. Y-direction shown in Fig. 2.Wherein, as long as described first direction intersects with second direction；Preferably, described first direction is vertically arranged with second direction.
Specifically, described first electrode 115 and the second electrode 116 can be arranged at the same surface of transparency conducting layer 114；The different surfaces of transparency conducting layer 114 can also being arranged at, as long as electrically connecting with described transparency conducting layer 114, and uniform resistor network can be formed on described transparency conducting layer 114.The material of said two the first electrode 115 and two the second electrodes 116 is metal, CNT or other conductive materials, as long as guaranteeing that these two the first electrodes 115 and two the second electrodes 116 can conduct electricity.In the present embodiment, said two the first electrode 115 is arranged at intervals at the two ends of described transparency conducting layer 114 in X direction, and said two the second electrode 116 is arranged at intervals at the two ends of described transparency conducting layer 114 along Y-direction；And X-direction is orthogonal with Y-direction.Described first electrode 115 and the second electrode 116 are all the silver layer of bar shaped.
In described touch screen 110, described protective clear layer 118 is arranged at the upper surface of described transparency conducting layer 114, can cover said two the first electrode 115 and two the second electrodes 116 simultaneously.Described protective clear layer 118 can be formed by materials such as silicon nitride, silicon oxide, phenylpropyl alcohol cyclobutane (BCB), polyester film or acrylic resins.This protective clear layer 118 may be used without layer of surface through cure process, smooth scratch resistant plastic layer, is used for protecting described transparency conducting layer 114, improves ruggedness.This protective clear layer 118 can also be used with to provide some additional functions, as reduced dazzle or reduce reflection.In the present embodiment, the material of this protective clear layer 118 is polyethylene terephthalate (PET).
In described upper substrate 120, the material of described upper electrode 124 can use the transparent conductive materials such as ITO, and on this, electrode 124 plays the effect applying orientation voltage to liquid crystal layer 140.
The material of the first both alignment layers 122 of described upper substrate 120 can be polystyrene and derivant, polyimides, polyvinyl alcohol, polyester, epoxy resin, Polyurethane, polysilane etc..First groove of described first both alignment layers 122 can use the friction method of prior art, tilts evaporation SiOxEmbrane method and film carries out the method such as very low power facture formed, this first groove can make liquid crystal molecule align.In the present embodiment, the material of described first both alignment layers 122 is polyimides, and thickness is 1 ~ 50 micron.
In described infrabasal plate 130, described second both alignment layers 132 is identical with the material of the first both alignment layers 122, and the second groove of described second both alignment layers 132 can make liquid crystal molecule align.Owing to the first groove of described first both alignment layers 122 is vertical with the orientation of the second groove of the second both alignment layers 132, therefore the arrangement angle that the liquid crystal molecule between the first both alignment layers 122 and the second both alignment layers 132 is between these two both alignment layers produces 90 degree of rotations, thus play the effect of optically-active, by the polarization direction 90-degree rotation of second 136 light to the rear of polaroid.In the present embodiment, the material of described second both alignment layers 132 is polyimides, and thickness is 1 ~ 50 micron.
Described thin-film transistor display panel 134 farther includes one the 3rd matrix, is formed at multiple thin film transistor (TFT)s of the 3rd body upper surface, multiple pixel electrode and a display drive circuit.The plurality of thin film transistor (TFT) connects one to one with pixel electrode, and the plurality of thin film transistor (TFT) is electrically connected with display drive circuit with gate line by source electrode line.Preferably, the plurality of thin film transistor (TFT) and multiple pixel electrode are arranged at the 3rd body upper surface in array fashion.
The material of described second polaroid 136 is polarizing materials commonly used in the prior art, such as dichroism high-molecular organic material, is specifically as follows iodine based material or dye materials etc..The material of described second polaroid 136 can also be described CNT membrane.The thickness of described second polaroid 136 is 1 micron ~ 0.5 millimeter.The light sent from the backlight module being arranged at touch LCD screen 10 lower surface is polarized by the acting as of described second polaroid 136, thus obtains the light along single direction polarization.The polarization direction of described second polaroid 136 and the polarization direction of described transparency conducting layer 114 can vertical can also be parallel, i.e. the polarization direction of this second polaroid 136 and the polarization direction of described carbon nanotube layer can vertical can also be parallel.In the present embodiment, the material of described second polaroid 136 is CNT membrane.The polarization direction of this second polaroid 136 is vertical with the polarization direction of described transparency conducting layer 114, that is, the direction that the most of CNTs in described transparency conducting layer 114 are arranged of preferred orient is vertical with the direction that the most of CNTs in this second polaroid 136 are arranged of preferred orient.
Referring to Fig. 4, second embodiment of the invention provides a touch LCD screen 20, and this touch LCD screen 20 is comprising: a touch screen 210；One upper substrate 220, described capacitance touch screen 210 is arranged at this upper substrate 220；One infrabasal plate 230, this infrabasal plate 230 is oppositely arranged with described upper substrate 220；And a liquid crystal layer 240, this liquid crystal layer 240 is arranged between described upper substrate 220 and described infrabasal plate 230.Wherein, described upper substrate 220 is followed successively by one first polaroid, matrix on, electrode 224 and one first both alignment layers 222 on one from top to bottom；Described infrabasal plate 230 includes one second both alignment layers 232, thin-film transistor display panel 234 and one second polaroid 236 the most successively.
The structure of the touch LCD screen 10 that the touch LCD screen 20 that this second embodiment provides provides with first embodiment is essentially identical, and difference is, the touch screen 210 in the present embodiment is a projection-type capacitive touch screen.Seeing also Fig. 5, this touch screen 210 includes one first matrix 211,1 first transparency conducting layer 212,1 second matrix 213,1 second transparency conducting layer 214, protective clear layer 215, multiple first electrode 216 and multiple second electrode 218.Wherein, described first transparency conducting layer 212 is arranged at the upper surface of described first matrix 211, and described second matrix 213 is arranged between described first transparency conducting layer 212 and the second transparency conducting layer 214.Described protective clear layer 215 is arranged at the upper surface of described second transparency conducting layer 214.The plurality of first electrode 216 is arranged at described first transparency conducting layer 212 is parallel to a side of described X-direction along a first direction such as X-direction is spaced, and electrically connects with this first transparency conducting layer 212 respectively；The plurality of second electrode 218 is arranged at described second transparency conducting layer 214 is parallel to a side of described Y-direction along a second direction such as Y-direction is spaced, and electrically connects with this second transparency conducting layer 214 respectively.
Described first matrix 211 is insulant with described second matrix 213, and all identical with the material of the first matrix 112 in first embodiment.Described first matrix 211 is also the upper matrix of described upper substrate 220 simultaneously, and therefore, described touch LCD screen 20 has relatively thin thickness and simple structure, simplify manufacturing process, reduce manufacturing cost, and improve the utilization rate of backlight, improve display quality.
Described first transparency conducting layer 212 is arranged at the lower surface of described second matrix 213.This first transparency conducting layer 212 is described carbon nanotube layer, and includes multiple CNT, and the plurality of CNT preferred orientation in the same direction extends.The material of this first transparency conducting layer 212 and identical with the material of the transparency conducting layer 114 in first embodiment and structure, so this first transparency conducting layer 212 also doubles as the first polaroid of described upper substrate 220.This carbon nanotube layer includes at least one described CNT membrane, and this at least one CNT membrane has an electrical impedance of minimum at its draw direction, and has maximum resistance resist being perpendicular to draw direction, thus possesses electrical impedance anisotropy, i.e. conducts electricity anisotropy.Wherein, second direction in this first transparency conducting layer 212 such as Y-direction in Fig. 5 is the axially extending direction of entirety of the most of CNTs in this carbon nanotube layer, and namely the CNT in this carbon nanotube layer joins end to end along Y-direction the direction being arranged of preferred orient.This first transparency conducting layer 212 resistivity in the Y direction is less than its resistivity in the other direction, and the resistivity being perpendicular in this Y-direction is maximum.The first direction of this first transparency conducting layer such as X-direction in Fig. 5, this X-direction is parallel to the surface of this carbon nanotube layer, and intersects with Y-direction.In the present embodiment, X-direction is perpendicular to Y-direction, and this first transparency conducting layer 212 resistivity in the Y direction is less than its resistivity in the X direction.
Owing to the carbon nanotube layer in this first transparency conducting layer 212 has good electric conductivity in the Y direction, when the plurality of first electrode 216 is arranged on this first transparency conducting layer 212 side the most spaced reciprocally, this first transparency conducting layer 212 can regard multiple spaced and parallel with the Y-direction conductive strips of formation as, and the plurality of conductive strips are respectively turned on the plurality of first electrode 216.The material of the plurality of first electrode 216 is conductor, such as metal.
Further, the carbon nanotube layer in this first transparency conducting layer 212 may also pass through etching or laser treatment forms multiple laser cut line, and the plurality of laser cut line extends along Y-direction, increases the conduction anisotropy of this carbon nanotube layer.
Described second transparency conducting layer 214 is arranged at the upper surface of described second matrix 213.This second transparency conducting layer 214 has the spaced conductive structure of multiple patterning, such as strip conductive structure, and it is substantially parallel to one another and is spaced a predeterminable range.The plurality of conductive structure extends along described X-direction, and along the Y-direction interval setting of described second transparency conducting layer 214.In general, the conducting direction of the conductive structure of this second transparency conducting layer 214 is perpendicular to the direction of minimum specific resistance of described first transparency conducting layer 212.In the present embodiment, this second transparency conducting layer 214 is the ito thin film of patterning, and includes that multiple strip conductive structure, the conducting direction of the plurality of strip conductive structure are perpendicular to the bearing of trend of the most of CNTs in described first transparency conducting layer 212.
The material being appreciated that described second transparency conducting layer 214 can be also the transparent conductive materials such as CNT.The most described second transparency conducting layer 214 can be a carbon nano-tube film, and this carbon nano-tube film is made up of equally distributed CNT, and is combined closely by Van der Waals force between CNT.CNT in this carbon nano-tube film is unordered or ordered arrangement.So-called lack of alignment refers to that the orientation of CNT is random.So-called ordered arrangement refers to that the orientation of CNT is regular.Specifically, when carbon nano-tube film includes the CNT of lack of alignment, CNT is mutually wound around or carbon nano-tube film isotropism；When carbon nano-tube film includes the CNT of ordered arrangement, the most of CNTs in this carbon nano-tube film are in one direction or multiple directions are arranged of preferred orient.
The plurality of second electrode 218 is spaced the side being arranged at described second transparency conducting layer 214 in a second direction, and is respectively turned on multiple conductive structures of this second transparency conducting layer 214.Each second electrode 218 extends in a first direction.The material of the plurality of second electrode 218 is identical with the material of the plurality of first electrode 216.
Owing to described first transparency conducting layer 212 and the second transparency conducting layer 214 are spaced by described second matrix 213, at multiple conductive strips of described first transparency conducting layer 212 with the cross one another multiple crossover locations of multiple conductive structures of described second transparency conducting layer 214, form multiple electric capacity.The plurality of electric capacity can be recorded by the external circuit electrically connected with described first electrode 216 and the second electrode 218.When the touch objects such as finger are near one or more crossover location, the electric capacity of this crossover location changes, and described external circuit detects the electric capacity of this change, thus obtains the coordinate of this touch location.
The material of the material of described protective clear layer 215 and effect and the protective clear layer 118 in the touch screen 110 in first embodiment and act on identical.
It is appreciated that described first transparency conducting layer 212 can exchange with material and the structure of described second transparency conducting layer 214.As, described first transparency conducting layer 212 can be the transparent conductive material such as ITO or carbon nano-tube film, and has multiple conductive structure；Second transparency conducting layer 214 is described carbon nanotube layer, and this carbon nanotube layer has conduction anisotropy.
The touch LCD screen that the embodiment of the present invention provides, have the advantage that first, the transparency conducting layer of the close described upper substrate that the present invention implements offer is carbon nanotube layer, this carbon nanotube layer serves not only as the transparency conducting layer of touch screen, and double as the first polaroid of this touch LCD screen, the first matrix in the capacitive touch screen that the embodiment of the present invention provides doubles as again the matrix of upper substrate, a matrix and a polaroid is saved relative to traditional touch LCD screen, therefore there is relatively thin thickness and simple structure, simplify manufacturing process, reduce manufacturing cost, and improve the utilization rate of backlight, improve display quality.Second, owing to described carbon nanotube layer has good toughness and mechanical strength, therefore, the carbon nanotube layer producing transparent conductive layer described in employing, the ruggedness of touch screen can be correspondingly improved, and then improve the ruggedness using this touch LCD screen.3rd, owing to CNT aligns in described carbon nanotube layer, therefore, use above-mentioned carbon nanotube layer producing transparent conductive layer, transparency conducting layer can be made to have the distribution of uniform resistance, thus improve touch screen and use the resolution of display device and the degree of accuracy of this touch screen.It addition, those skilled in the art can also do other change in spirit of the present invention, these changes done according to present invention spirit, all should be included in scope of the present invention.
Claims (8)
1. a touch LCD screen, it is characterised in that this touch LCD screen is the most successively
Including:
One capacitive touch screen, this capacitive touch screen includes the most successively: one second electrically conducting transparent
Layer, one second matrix, one first transparency conducting layer and one first matrix；
One upper substrate, this upper substrate include the most successively one first polaroid, matrix on, on one
Electrode and one first both alignment layers；
One liquid crystal layer；And
One infrabasal plate, this infrabasal plate includes one second both alignment layers, a thin film transistor (TFT) face the most successively
Plate and one second polaroid；
It is characterized in that, described first transparency conducting layer is conduction anisotropy layer, this electric anisotropy layer
Being a carbon nanotube layer, this carbon nanotube layer includes in multiple CNT, and this carbon nanotube layer
CNT preferred orientation in a second direction extends, and this carbon nanotube layer includes that at least one CNT draws
Film, when described carbon nanotube layer includes multiple CNT membrane, this CNT membrane stacking is arranged
Or parallel gapless lays and arrange, and this CNT membrane is a continuous print layer structure, and second is saturating
Bright conductive layer includes that multiple conductive structure, the plurality of conductive structure extend in a first direction, and along second
The spaced spread configuration in direction, described first direction is vertical with second direction, described first polaroid
For the carbon nanotube layer of described capacitive touch screen, described upper matrix is the of described capacitive touch screen
One matrix；
Described capacitive touch screen farther includes multiple first electrode and multiple second electrode, and the plurality of
One electrode is arranged at described first transparency conducting layer and is parallel to a side of described first direction, and these are many
Individual first electrode be spaced along this first direction be arranged on this first transparency conducting layer and with this first
Transparency conducting layer electrically connects, and forms spaced multiple conductive strips；The plurality of second electrode is arranged at
Described second transparency conducting layer is parallel to a side of described second direction, and the plurality of second electrode edge
This second direction is spaced and is arranged on this second transparency conducting layer and ties with the plurality of conduction respectively
Structure electrically connects.
2. touch LCD screen as claimed in claim 1, it is characterised in that the material of described conductive structure
Material is tin indium oxide or CNT.
3. touch LCD screen as claimed in claim 1, it is characterised in that described carbon nanotube layer has
There is multiple laser cut line extended in a second direction.
4. touch LCD screen as claimed in claim 1, it is characterised in that in described carbon nanotube layer
Substantially towards each CNT in most of CNTs of second direction extension and at bearing of trend
Upper adjacent CNT is joined end to end by Van der Waals force.
5. touch LCD screen as claimed in claim 1, it is characterised in that described carbon nanotube layer exists
Resistivity in second direction described in CNT is less than the resistivity on other directions.
6. touch LCD screen as claimed in claim 5, it is characterised in that described carbon nanotube layer exists
Resistivity in CNT second direction is less than or equal to the ratio of the resistivity on other directions
1:2。
7. touch LCD screen as claimed in claim 1, it is characterised in that described carbon nanotube layer enters
One step includes reinforcing material, this reinforcing material be uniformly distributed in described at least one CNT membrane.
8. touch LCD screen as claimed in claim 7, it is characterised in that described reinforcing material be nickel,
Gold, platinum, ferrum, cobalt or copper.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310490033.4A CN103592788B (en) | 2010-05-31 | Touch LCD screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310490033.4A CN103592788B (en) | 2010-05-31 | Touch LCD screen |
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| CN201010187834A Division CN101852934A (en) | 2010-05-31 | 2010-05-31 | Touch liquid crystal display |
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