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US20100001975A1 - Portable computer - Google Patents

Portable computer Download PDF

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Publication number
US20100001975A1
US20100001975A1 US12/459,544 US45954409A US2010001975A1 US 20100001975 A1 US20100001975 A1 US 20100001975A1 US 45954409 A US45954409 A US 45954409A US 2010001975 A1 US2010001975 A1 US 2010001975A1
Authority
US
United States
Prior art keywords
carbon nanotube
nanotube film
portable computer
conductive layer
transparent conductive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/459,544
Other languages
English (en)
Inventor
Kai-Li Jiang
Qun-Qing Li
Shou-Shan Fan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tsinghua University
Hon Hai Precision Industry Co Ltd
Original Assignee
Tsinghua University
Hon Hai Precision Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tsinghua University, Hon Hai Precision Industry Co Ltd filed Critical Tsinghua University
Assigned to HON HAI PRECISION INDUSTRY CO., LTD, TSINGHUA UNIVERSITY reassignment HON HAI PRECISION INDUSTRY CO., LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FAN, SHOU-SHAN, JIANG, KAI-LI, LI, QUN-QING
Publication of US20100001975A1 publication Critical patent/US20100001975A1/en
Priority to US14/837,415 priority Critical patent/US10901565B2/en
Abandoned legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1626—Constructional details or arrangements for portable computers with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1643—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being associated to a digitizer, e.g. laptops that can be used as penpads
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0447—Position sensing using the local deformation of sensor cells
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/047—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using sets of wires, e.g. crossed wires
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0426—Layout of electrodes and connections

Definitions

  • the present disclosure relates to portable computers, and, in particular, to a portable computer having a carbon nanotube based touch panel.
  • Conventional portable computers include display panels and bodies connected to the display panels. Touch panels are mounted on surfaces of the display panels.
  • the touch panels can function as inputting devices, effectively replacing a mouse or keyboard, to control and input information.
  • a user of any such electronic apparatus operates the touch panel by pressing or touching the touch panel with a finger, a pen, a stylus, or any tool while visually observing the display panel.
  • a resistance-type a capacitance-type
  • an infrared-type a capacitance-type
  • a surface sound wave-type a capacitance-type
  • the resistance-type and capacitance-type touch panels have been widely used in the portable computers because of higher accuracy and resolution.
  • ITO indium tin oxide
  • the ITO layer of the conventional touch panel have poor mechanical durability, low chemical endurance, and uneven resistance over an entire area of the touch panel.
  • the ITO layer has relatively low transparency in humid environments. All the above-mentioned problems of the ITO layer tend to yield a touch panel with relatively low sensitivity, accuracy, and brightness.
  • the ITO layer is generally formed by means of ion-beam sputtering, a relatively complicated method.
  • FIG. 1 is an isometric view of one embodiment of a portable computer having one embodiment of a resistive-type touch panel.
  • FIG. 2 is an isometric, partial exploded view of the resistive-type touch panel of FIG. 1 .
  • FIG. 3 is a schematic, cross-sectional view of the resistive-type touch panel of FIG. 1 .
  • FIG. 4 is a schematic view of the resistive-type touch panel of FIG. 1 when in use.
  • FIG. 5 is a schematic view of another embodiment of a portable computer having one embodiment of a capacitive-type touch panel when in use.
  • FIG. 6 is a schematic, cross-sectional view of the capacitive-type touch panel of FIG. 5 .
  • a portable computer 100 includes a display panel 80 , a body 90 , and one embodiment of a touch panel 10 .
  • the display panel 80 has a display surface 801 .
  • the body 90 is disposed on another surface of the display panel 80 opposite to the display surface 801 .
  • the touch panel 10 is mounted on the display surface 801 of the display panel 80 .
  • the display panel 80 may be one of a liquid crystal display panel, a field emission display panel, a plasma display panel, an electroluminescent display panel, a vacuum fluorescent display panel, or the like.
  • the display panel 80 is used to display data, images, and other objects from the body 90 .
  • the display panel 80 is a liquid crystal display panel. Electrical connections between the display panel 80 , the body 90 and the touch panel 10 are achieved via internal input and output ports because the display panel 80 , the body 90 , and the touch panel 10 are integrated together.
  • the portable computer 100 includes an external input port 60 and at least one external output port 70 disposed on a side wall of the body 90 .
  • the input port 60 may be used to connect a mouse and/or a keyboard to the body 90 .
  • the output port 70 may be used to connect to another device.
  • the body 90 includes a mother board, a central processing unit (CPU), a memory, and a hard disk.
  • the mother board includes a system bus, a data bus, a control bus, sockets, and connectors disposed thereon.
  • the CPU, the memory, a display card, an audio card, a net card, or a video card may be directly installed on the mother board.
  • the hard disk and a power source mounted in the body 90 are electrically connected to the mother board via cables.
  • One end of the display card electrically connects to an inner input port (not shown) to transport signals to the display panel 80 from the body 90 .
  • the portable computer 100 may further include buttons, lamps, or switches installed to the mother board, and two speakers 904 and a hard disk drive 902 disposed on side walls thereof.
  • the touch panel 10 has a function of inputting signals.
  • the signals can be command signals, text signals, and so on.
  • the touch panel 10 can replace conventional input means, such as a mouse and a keyboard.
  • a user of any such electronic apparatus operates the touch panel 10 by pressing or touching the touch panel 10 with a finger, a pen, a stylus, or another like tool to input signals to the body 90 .
  • the touch panel 10 can be spaced from the display surface 801 or installed directly on the display panel 80 . When the display panel 80 is installed directly on the touch panel 10 , the touch panel 10 can be adhered on the display surface 801 via paste, such as silver paste. In the present embodiment, the touch panel 10 is installed directly on the display panel 80 .
  • the touch panel 10 may have substantially the same surface area as the display surface 801 of the display panel 80 . Understandably, when the touch panel 10 has an area sufficiently less than that of the display surface 801 , more than one touch panel 10 may be mounted on the display surface 801 for inputting different instructions at the same time via different touch panels 10 .
  • the touch panel 10 and the display panel 80 may be integrated, such as using a same base.
  • a screen keyboard 802 can be disposed on the display surface 801 of the display panel 80 for directly inputting information via the touch panel 10 .
  • one embodiment of the touch panel 10 is a resistive-type touch panel, and includes a first electrode plate 12 , a second electrode plate 14 , and a plurality of transparent dot spacers 16 interposed between the first and second electrode plates 12 , 14 .
  • the first electrode plate 12 includes a first substrate 120 , a first transparent conductive layer 122 , and two first electrodes 124 .
  • the first substrate 120 has a planar structure, and includes a first surface.
  • the first transparent conductive layer 122 and the two first electrodes 124 are mounted on the first surface of the first substrate 120 .
  • the two first electrodes 124 are respectively disposed on the two ends of the first substrate 120 along a first direction and electrically connected to the first transparent conductive layer 122 .
  • the second electrode plate 14 includes a second substrate 140 , a second transparent conductive layer 142 and two second electrodes 144 .
  • the second substrate 140 has a planar structure, and includes a second surface facing the first surface.
  • the second transparent conductive layer 142 and the two second electrodes 144 are disposed on the second surface of the second substrate 140 .
  • the two second electrodes 144 are respectively disposed on the two ends of the second surface of the second substrate 140 along a second direction and electrically connected to the second transparent conductive layer 142 .
  • the first direction is substantially perpendicular to the second direction, namely, the two first electrodes 124 are orthogonal to the two second electrodes 144 .
  • the second substrate 140 of the touch panel 10 is mounted on the display surface 801 of the display panel 80 .
  • the first substrate 120 can be a transparent and flexible film or plate made of polymer, resin, or any other suitable flexible material.
  • the second substrate 140 can be a rigid and transparent board made of glass, diamond, quartz, plastic or any other suitable material, or can be a transparent flexible film or plate similar to the first substrate 120 when the touch panel 10 is flexible.
  • the first electrodes 124 and the second electrodes 144 are made of metal, metallic carbon nanotube film or any other conductive material, so long as it is electrically conductive.
  • the first substrate 120 is made of resin material
  • the second substrate 140 is made of glass
  • the first and second electrodes 124 , 144 are carbon nanotube films having a width of about 1 ⁇ m to about 1 mm.
  • an insulating pad 18 is disposed on the periphery of the second surface of the second electrode plate 14 .
  • the first electrode plate 12 is disposed on the insulating pad 18 .
  • the first transparent conductive layer 122 of the first electrode plate 12 faces the second transparent conductive layer 142 of the second electrode plate 14 .
  • the plurality of transparent dot spacers 16 are spaced apart from one another and disposed on the second transparent conductive layer 142 of the second electrode plate 14 .
  • a distance between the first and second electrode plates 12 , 14 are in a range of about 2 ⁇ m to about 100 ⁇ m.
  • the insulating pad 18 and the transparent dot spacers 16 are made of transparent resin or the like and are used for insulating the first electrode plate 14 with the second electrode plate 12 . Understandably, if the resistive-type touch panel 10 is small enough, the dot spacers 16 may be omitted.
  • a transparent protective film 126 may be disposed on the top surface of the first electrode plate 12 opposite to the first surface of the first electrode plate 12 .
  • the transparent protective film 126 may be directly adhered on the first electrode plate 12 via paste, or combined with the first electrode plate 12 via a heat-press method.
  • the transparent protective film 126 may be a plastic layer or a resin layer, which are dealt with via surface rigid treating.
  • the resin layer may be made of benzo-cyclo-butene, polymethyl methacrylate, polymer resin, polyethylene terephthalate, or the like.
  • the transparent protective film 126 is made of polyethylene terephthalate, and configured for protecting the first electrode plate 12 by improving wearability thereof.
  • the transparent protective film 126 may provide some additional function, such as decreasing glare and reflection.
  • At least one of the first and second transparent conductive layers 122 , 142 includes a carbon nanotube structure.
  • the carbon nanotube structure includes one or more carbon nanotube films.
  • the carbon nanotube film is formed by a plurality of carbon nanotubes, ordered or otherwise, and has a uniform thickness.
  • the carbon nanotube film can be an ordered film or a disordered film.
  • the ordered carbon nanotube film consists of ordered carbon nanotubes.
  • Ordered carbon nanotube films include films where the carbon nanotubes are arranged along a primary direction. Examples include films where the carbon nanotubes are arranged approximately along a same direction or have two or more sections within each of which the carbon nanotubes are arranged approximately along a same direction (different sections can have different directions).
  • the carbon nanotubes can be primarily oriented along a same direction.
  • the ordered carbon nanotube film can also have sections of carbon nanotubes aligned in a common direction.
  • the ordered carbon nanotube film can have two or more sections, and the sections can have different alignments.
  • the ordered carbon nanotube film may have a free-standing structure.
  • the free-standing carbon nanotube film may include two types. One type is that the carbon nanotube film needs no substrate to support the carbon nanotubes thereof. Another type is that the carbon nanotube film only needs one or more supporting dots (not shown) to support one or more points thereof. Thus, left parts of the carbon nanotube film are hung.
  • the carbon nanotubes are oriented along a same preferred orientation and approximately parallel to each other.
  • the term “approximately” as used herein means that it is impossible and unnecessary that each of the carbon nanotubes in the carbon nanotube films are exactly parallel to one another, namely that every carbon nanotube is parallel to each other, because in the course of fabricating the carbon nanotube film, some factor, such as the change of drawing speed, affects the non-uniform drawing force on the carbon nanotube film as the carbon nanotube film is drawn from a carbon nanotube array.
  • a film can be drawn from a carbon nanotube array, to form the ordered carbon nanotube film, namely a drawn carbon nanotube film. Examples of drawn carbon nanotube film are taught by U.S. Pat. No.
  • the drawn carbon nanotube film includes a plurality of successive and oriented carbon nanotubes joined end-to-end by van der Waals attractive force therebetween.
  • the drawn carbon nanotube film is a free-standing film.
  • the carbon nanotube film can be treated with an organic solvent to increase the mechanical strength and toughness of the carbon nanotube film and reduce the coefficient of friction of the carbon nanotube film.
  • a thickness of the carbon nanotube film can range from about 0.5 nanometers to about 100 micrometers.
  • the ordered film also can be a pressed carbon nanotube film.
  • the carbon nanotubes in the pressed carbon nanotube film can overlap each other.
  • the adjacent carbon nanotubes are combined and attracted by van der Waals attractive force, thereby forming a free-standing structure.
  • the pressed carbon nanotube film has two or more sections, each of which has the carbon nanotubes arranged approximately along a same direction (different sections can have different directions).
  • the pressed carbon nanotube film can be formed by pressing a carbon nanotube array on a substrate.
  • An angle between a primary alignment direction of the carbon nanotubes and the substrate is in a range from about 0 degrees to about 15 degrees. The angle is closely related to pressure applied to the carbon nanotube array. The greater the pressure, the smaller the angle.
  • the carbon nanotubes in the pressed carbon nanotube film can be approximately parallel to the surface of the pressed carbon nanotube film when the angle is about 0 degrees.
  • the disordered carbon nanotube film consists of disordered carbon nanotubes.
  • Disordered carbon nanotube films include randomly aligned carbon nanotubes. When the disordered carbon nanotube film has a number of the carbon nanotubes aligned in every direction that are substantially equal, the disordered carbon nanotube film can be isotropic. The disordered carbon nanotubes can be entangled with each other and/or are approximately parallel to a surface of the disordered carbon nanotube film.
  • the disordered carbon nanotube film may be a flocculated carbon nanotube film.
  • the flocculated carbon nanotube film can include a plurality of long, curved, disordered carbon nanotubes entangled with each other.
  • the carbon nanotubes in the flocculated carbon nanotube film can be isotropic.
  • the carbon nanotubes can be substantially uniformly dispersed in the carbon nanotube film. Adjacent carbon nanotubes are attracted by van der Waals attractive force to form an entangled structure with micropores defined therein. It is understood that the flocculated carbon nanotube film is very porous. Sizes of the micropores can be less than 10 micrometers. The porous nature of the flocculated carbon nanotube film will increase a specific surface area of the carbon nanotube structure.
  • the touch panel 10 employing the flocculated carbon nanotube film has excellent durability, and can be fashioned into desired shapes with a low risk to the integrity of the flocculated carbon nanotube film.
  • the thickness of the flocculated carbon nanotube film can range from about 0.5 nanometers to about 1 millimeter.
  • a length and a width of the carbon nanotube film can be arbitrarily set as desired.
  • a thickness of the drawn carbon nanotube film is in a range from about 0.5 nanometers to about 100 micrometers.
  • a thickness of the pressed or flocculated carbon nanotube film is in a range from about 0.5 nm to about 1 mm.
  • the carbon nanotubes in the carbon nanotube film can be selected from the group consisting of single-walled, double-walled, multi-walled carbon nanotubes, and combinations thereof.
  • Diameters of the single-walled carbon nanotubes, the double-walled carbon nanotubes, and the multi-walled carbon nanotubes can, respectively, be in the approximate range from about 0.5 nm to about 50 nanometers, about 1 nm to about 50 nanometers, and about 1.5 nm to about 50 nanometers.
  • the first transparent conductive layer 122 and the second transparent conductive layer 124 each include a carbon nanotube structure.
  • the first and second transparent conductive layers 122 , 124 are free standing carbon nanotube films and are made of the carbon nanotube film.
  • the carbon nanotube structure is an ordered drawn carbon nanotube film.
  • the drawn carbon nanotube structure may include a number of carbon nanotube films stacked with each other.
  • the carbon nanotubes of each of the drawn carbon nanotube films are arranged along a preferred orientation.
  • the drawn carbon nanotube film includes a number of carbon nanotube segments joined end by end via van der Waals attractive forces.
  • the carbon nanotube segments have a substantially same length and composed of a number of substantially parallel arranged carbon nanotubes.
  • the drawn carbon nanotube films of the first transparent conductive layer 122 are overlapped along the first direction
  • the drawn carbon nanotube films of the second transparent conductive layer 124 are overlapped along the second direction.
  • the drawn carbon nanotube films have a thickness of about 0.5 nm to about 100 mm and a width of about 0.01 centimeters to about 10 meters.
  • the touch panel 10 further includes a touch controller 19 .
  • the touch controller 19 is configured to control and handle data and signals of touch points of the touch panel 10 .
  • the display panel 80 further includes a display controller 82 .
  • the display controller 82 is configured to control the input and output of data of the display panel 80 .
  • a voltage of about 5 volts is applied to the first and second electrodes 124 , 144 , forming equipotential lines respectively substantially parallel to the first and second electrodes 124 , 144 in the first and second transparent conductive layers 122 , 142 .
  • a user operates the portable computer 100 by pressing or touching the first electrode plate 12 of the touch panel 10 with a touch tool 180 , such as a finger, or an electrical pen/stylus, while visually observing the display panel 80 through the touch panel 10 .
  • This pressing causes a deformation of the first electrode plate 12 .
  • the deformation of the first electrode plate 12 causes a connection between the first and second transparent conductive layers 122 , 124 .
  • Changes in voltages in the first direction of the first transparent conductive layer 122 and the second direction of the second transparent conductive layer 142 can be detected by the touch controller 19 . Then, the touch controller 19 transforms the changes in voltages into coordinates of a touch point 51 , and sends the coordinates of the touch point 51 to the body 90 .
  • the body 90 finds an instruction according to the coordinates of the touch point 51 and executes the instruction, such as sending a control signal to the display panel 82 of the display panel 80 , and the display panel 80 operates according to the control signal.
  • another embodiment of the portable computer 200 includes a display panel 180 , a body 190 , and a capacitive-type touch panel 30 .
  • a passivation layer 104 is disposed on the touch panel 30 and the display panel 180 .
  • the passivation layer 104 is used for preventing crosstalk, electrochemical corrosion, and reducing power consumption.
  • the passivation layer 104 is made of silicon nitrogen, silicon oxide, or the like.
  • the portable computer 200 may further includes a supporter 108 for supporting the capacitive-type touch panel 30 .
  • the supporter 108 is sandwiched between the capacitive-type touch panel 30 and the display panel 180 . Understandably, when the touch panel 30 is directly disposed on the display panel 80 , the supporter 108 can be omitted, and the passivation layer 104 can be directly mounted on the display surface 181 of the display panel 80 .
  • the touch panel 30 is a capacitive-type touch panel.
  • the touch panel 30 includes a substrate 32 , a transparent conductive layer 34 , at least two electrodes 38 , and a transparent protective film 36 .
  • the substrate 32 includes a first surface 321 and a second surface 322 opposite to the first surface 321 .
  • the transparent conductive layer 34 is mounted on the first surface 321 of the substrate 32 .
  • the electrodes 38 are disposed at the periphery of the transparent conductive layer 34 , spaced from each other, and electrically connected to the transparent conductive layer 34 to form equipotential lines thereon.
  • the transparent protective layer 36 can be directly disposed on the transparent conductive layer 34 and the electrodes 38 .
  • the substrate 32 can have a curved structure or a planar structure and functions as a supporter.
  • the substrate 32 may be made of a rigid material or a flexible material, such as glass, silicon, diamond, plastic, or the like.
  • the transparent conductive layer 34 includes a carbon nanotube layer.
  • the carbon nanotube structure includes a number of uniformly arranged carbon nanotubes, orderly or disorderly.
  • the carbon nanotube structure of the transparent conductive layer 34 has a same configuration as the first and second transparent conductive layer 122 , 124 .
  • the touch panel 30 may have a linear-shaped, triangular-shaped or rectangular-shaped touch area. In the present embodiment, the touch panel 30 has a rectangular-shaped touch area.
  • the transparent conductive layer 34 and the substrate 32 also have a rectangular shape.
  • the touch panel 30 has four electrodes 38 respectively disposed at the four sides of the transparent conductive layer 34 . Understandably, the four electrodes 38 can be disposed on different surfaces of the transparent conductive layer 34 as long as equipotential lines can be formed on the transparent conductive layer 34 .
  • the four electrodes 38 are made of conductive metal, carbon nanotube thin film, or the like. In the present embodiment, the four electrodes 38 are layers of silver, copper, or foils of metal, and have strip-shaped structures.
  • the electrodes 38 can be formed on the transparent conductive layer 34 via a deposition method, such as sputter, electroplating, chemical plating, or the like. Furthermore, the four electrodes 38 can be adhered on the transparent conductive layer 34 via paste, such as silver paste.
  • a transparent protective film 36 is disposed on the transparent conductive layer 34 and the electrodes 38 .
  • the transparent protective film 36 is made of polyethylene terephthalate, silicon nitrogen, silicon oxide or the like, and configured for protecting the transparent conductive layer 34 for improving wearability thereof.
  • the transparent protective film 36 may provide some additional function, such as decreasing glare and reflection after special surface treatment.
  • the transparent protective film 36 which is made of silicon dioxide, is disposed on the transparent conductive layer 34 on which the electrodes 38 are mounted.
  • the transparent protective film 36 has a hardness of about 7H (H established according to Rockwell hardness test). Understandably, the hardness and the thickness of the transparent protective film 36 may be determined in practice as desired.
  • the transparent protective film 36 is directly adhered on the transparent conductive layer 34 via paste.
  • the portable computer 200 further includes a shielding layer 35 disposed on the second surface 322 of the touch panel 30 when the touch panel 30 is integrated with the display panel 180 .
  • the material of the shielding layer 35 can be a conductive resin film, indium tin oxide; antimony doped tin oxide, carbon nanotube film, or another kind of flexible and conductive film.
  • the shielding layer 35 is a carbon nanotube film.
  • the carbon nanotube film includes a plurality of carbon nanotubes, and the orientation of the carbon nanotubes therein can be arbitrarily determined. Understandably, the carbon nanotubes in the carbon nanotube film of the shielding layer 35 can be arranged along a same direction.
  • the carbon nanotube film is connected to ground and acts as shielding, thus enabling the touch panel 30 to operate without interference (e.g., electromagnetic interference).
  • the touch panel 30 includes a touching controller 39 .
  • the touching controller 39 is configured to control and calculate the information of the touch panel 30 .
  • the display panel 180 further includes a touch panel control element 182 .
  • the touch panel control element 182 is configured to control the input and output of data of the displaying panel 180 .
  • a user operates the portable computer 200 by pressing or touching the transparent protective layer 36 of the touch panel 30 with a touch tool 150 , such as a finger, or an electrical pen/stylus, while visually observing the display panel 180 through the touch panel 30 .
  • a coupling capacitance forms between the user and the transparent conductive layer 34 due to an electrical field from the user.
  • the coupling capacitance is a conductor, and thus the touch tool takes away little current from the touch point.
  • Currents flowing through the four electrodes 38 cooperatively replace the current lost at the touch point.
  • the quantity of current supplied by each electrode 38 is directly proportional to the distance from the touch point to the electrodes 38 .
  • the touch panel control element 182 is used to calculate the proportion of the four supplied currents, thereby detecting coordinates of the touch point on the touch panel 30 .
  • the touch panel control element 182 then sends the coordinates of the touch point to the body 190 .
  • the body 190 then sends out commands corresponding to the touch point, such as to the display control element 182 , and the display control element 182 further controls the display of the display panel 180 .
  • the carbon nanotube films employed in the touch panel have superior properties, such as excellent toughness, high mechanical strength, and uniform conductivity.
  • the touch panel and the mobile phone using the same are durable and highly conductive.
  • Each of the carbon nanotube films includes a number of successively oriented carbon nanotubes joined end to end by the van der Waals attractive force therebetween.
  • the carbon nanotube films are flexible, and suitable for using as the conductive layer in a flexible touch panel.
  • the carbon nanotube films have high transparency, thereby promoting improved brightness of the touch panel and the mobile phone using the same.
  • the carbon nanotubes have excellent electrical conductivity properties, the carbon nanotube films have a uniform resistance distribution.
  • the touch panel and the mobile phone adopting the carbon nanotube films have improved sensitivity and accuracy.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
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