TWI420353B - Touch pen - Google Patents

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Publication number
TWI420353B
TWI420353B TW99146747A TW99146747A TWI420353B TW I420353 B TWI420353 B TW I420353B TW 99146747 A TW99146747 A TW 99146747A TW 99146747 A TW99146747 A TW 99146747A TW I420353 B TWI420353 B TW I420353B
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TW
Taiwan
Prior art keywords
pen
carbon nanotube
pen tip
tip
touch
Prior art date
Application number
TW99146747A
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Chinese (zh)
Other versions
TW201227432A (en
Inventor
Kai-Li Jiang
Shou-Shan Fan
Original Assignee
Hon Hai Prec Ind Co Ltd
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Priority to TW99146747A priority Critical patent/TWI420353B/en
Publication of TW201227432A publication Critical patent/TW201227432A/en
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Publication of TWI420353B publication Critical patent/TWI420353B/en

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Description

Stylus

The present invention relates to a stylus, and more particularly to a stylus applied to a touch screen.

In recent years, with the development of high performance and diversification of various electronic devices such as mobile phones and touch navigation systems, electronic devices in which a translucent touch panel is mounted on the front surface of a display device such as a liquid crystal are gradually increasing. The user of such an electronic device visually confirms the display content of the display device located on the back surface of the touch panel by the touch panel, and presses the touch panel to operate by a finger or a pen. Thereby, various functions of the electronic device can be operated.

According to the working principle of the touch screen and the transmission medium, the previous touch screens are divided into four types, namely resistive, capacitive, infrared and surface acoustic wave. Among them, the capacitive touch screen is widely used due to its high sensitivity and small touch force.

Previous capacitive touch screens included a transparent conductive layer to which a plurality of electrodes were attached. In use, a finger or a stylus is usually used to touch the surface of the capacitive screen, and a contact capacitance is formed between the touch object and the transparent conductive layer, and the external circuit senses the touch point and the respective electrodes of the transparent conductive layer on the surface of the touch screen. An electrical signal that can determine the location of the touch point on the touch screen. The tip of the previous stylus is generally made of metal in order to obtain good electrical conductivity. However, through gold The tip of the stylus made of a material has a high hardness and is liable to cause damage to the touch screen, and the contact capacitance and sensitivity when it is in contact with the touch screen still needs to be improved.

In view of this, it is necessary to provide a stylus having a large contact capacitance with a touch screen during use, having high sensitivity, and having less damage to the touch screen.

A stylus pen includes a pen holder and a pen tip, the pen tip being flexible and electrically conductive. The tip of the pen forms a contact capacitance with the touch screen when in use. The pen tip includes a flexible polymer material and graphene dispersed in the flexible polymer material.

A stylus pen includes a pen holder and a pen tip. The pen tip has flexibility and conductivity, and the pen tip forms a contact capacitance with the touch screen when in use. The pen tip includes a support body and a layer of a touch material disposed on a surface of the support body, the touch material layer being composed of a flexible polymer matrix and graphene dispersed in the flexible polymer matrix.

Compared with the prior art, since graphene has very good electrical conductivity, large specific surface area and good flexibility, the contact capacitance of the stylus pen of the present invention is in contact with the capacitive touch screen. Large, with high sensitivity. In addition, since the graphene has a smaller friction coefficient than the metal, the tip is less likely to damage the touch screen.

100,200,300‧‧‧ stylus

12‧‧‧Nano Carbon Tube Structure

110‧‧‧ pen

114‧‧‧Fixed end

120,220,320‧‧‧ pen head

121‧‧‧Support

122,222,322‧‧‧Fixed Department

124‧‧‧ Subject

125‧‧‧Touch material layer

126,326‧‧‧Enclosed space

22‧‧‧Nano Carbon Tube

24‧‧‧Flexible polymer matrix

25‧‧‧Nano carbon pipeline structure

28‧‧‧ Graphene

152‧‧‧Nano carbon pipeline

224,324‧‧‧ Touch

225‧‧‧Micropores

226‧‧‧ Conductive material layer

252‧‧‧ fixed end

254‧‧‧Touch end

280‧‧‧graphene layer

FIG. 1 is a schematic structural diagram of a stylus according to a first embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a pen holder of a stylus according to a first embodiment of the present invention.

3 is a cross-sectional view showing a tip of a stylus according to a first embodiment of the present invention.

4 is a schematic view of a pen tip of a hollow structure of a stylus according to a first embodiment of the present invention.

FIG. 5 is a schematic structural view of a stylus pen having a spiral strip-shaped touch material layer according to a first embodiment of the present invention.

FIG. 6 is a schematic diagram of a carbon nanotube polymer composite material used in a tip of a stylus according to a first embodiment of the present invention.

FIG. 7 is a schematic structural view of a carbon nanotube composite material having a carbon nanotube structure used in a tip of a stylus according to a first embodiment of the present invention.

FIG. 8 is a schematic structural view of another carbon nanotube composite material having a carbon nanotube structure used in a tip of a stylus according to a first embodiment of the present invention.

FIG. 9 is a scanning electron micrograph of a carbon nanotube film used in a tip of a stylus according to a first embodiment of the present invention.

FIG. 10 is a structural schematic view of the touch material layer of the tip of the stylus when the carbon nanotube structure of FIG. 8 is a carbon nanotube array.

Figure 11 is a schematic view showing the structure of a contact material layer in which a carbon nanotube in a carbon nanotube array exposes a surface of a flexible polymer substrate.

FIG. 12 is a scanning electron micrograph of a carbon nanotube flocculation film used in the tip of a stylus according to a first embodiment of the present invention.

FIG. 13 is a scanning electron micrograph of a carbon nanotube rolled film comprising carbon nanotubes arranged in a preferred orientation in the same direction, which is used in the tip of the stylus according to the first embodiment of the present invention.

FIG. 14 is a view showing another scanning method of a carbon nanotube rolled film including carbon nanotubes arranged in different orientations according to a preferred embodiment of the stylus according to the first embodiment of the present invention; Electron micrograph.

15 is a schematic view showing a layer of a touch material formed on a surface of a flexible polymer substrate by using a plurality of carbon nanotube tubes formed by parallelly disposed nanocarbon tubes in a tip of a stylus according to a first embodiment of the present invention.

16 is a schematic view showing a layer of a touch material formed on a surface of a flexible polymer substrate by using a plurality of carbon nanotubes formed by a cross-setting nanocarbon line in a tip of a stylus according to a first embodiment of the present invention.

17 is a scanning electron micrograph of a non-twisted nanocarbon pipeline used in the tip of a stylus according to a first embodiment of the present invention.

18 is a scanning electron micrograph of a twisted nanocarbon pipeline used in the tip of a stylus according to a first embodiment of the present invention.

FIG. 19 is a schematic structural view of a porous carbon nanotube composite material formed of a carbon nanotube and a conductive material used in a tip of a stylus according to a first embodiment of the present invention.

20 is a schematic structural view of a graphene polymer composite material used in a tip of a stylus pen according to a first embodiment of the present invention.

FIG. 21 is a schematic structural diagram of graphene used in the tip of a stylus according to a first embodiment of the present invention.

FIG. 22 is a schematic structural diagram of a touch material layer of a stylus according to a first embodiment of the present invention.

FIG. 23 is a schematic structural diagram of a stylus according to a second embodiment of the present invention.

FIG. 24 is a schematic structural view of a tip of a stylus according to a second embodiment of the present invention.

FIG. 25 is a schematic structural view of a stylus according to a third embodiment of the present invention.

The touch screen stylus of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Referring to FIG. 1, a first embodiment of the present invention provides a stylus 100 for a touch screen. The stylus 100 includes a pen holder 110 and a pen tip 120 disposed at one end of the pen holder 110. The tip 120 has flexibility and electrical conductivity.

The function of the pen 110 of the stylus pen 100 of the present invention is mainly to provide the user with a gripping position when the pen tip 120 is operated. When the stylus 100 is a pen that is electrically conductive to achieve a touch operation, the pen 110 needs to have a function of transmitting static charge on the human hand to the pen 120, that is, the pen 110 needs to be electrically connected to the pen 120. connection. When the stylus 100 is not a pen that is electrically conductive to achieve a touch operation, such as a capacitive stylus 100 that is provided with a capacitive conductor electrically connected to the stylus 120 in the stylus 110, the stylus It is not necessary to have a conductive connection between the 110 and the pen tip 120 as long as a contact capacitance can be formed between the pen tip 120 and the touch screen. It can be understood that the material, structure, shape of the pen 110 of the stylus pen 100 of the present invention and the connection manner with the pen tip 120 can be selected or changed according to actual needs. In this embodiment, the structure of the pen tip 120 of the stylus pen 100 of the present invention is mainly described by taking the stylus 100 of the human body and the cylindrical metal pen 110 as an example.

Referring to FIG. 2, the pen holder 110 has a hollow cylindrical structure and has a fixed end 114. The fixed end 114 of the pen holder 110 is internally provided with an internal thread for mounting the pen tip 120 The pen tip 120 is screwed into the fixed end 114 of the pen holder 110. When the pen tip 120 is screwed into the fixed end 114 of the pen holder 110, the pen tip 120 is electrically connected to the pen holder 110. It can be understood that the connection manner of the pen tip 120 and the pen holder 110 is not limited thereto, and an appropriate manner may be selected according to the shapes, structures, and materials of the pen holder 110 and the pen tip 120 in various connection manners in the prior art, as long as the pen holder 110 and the pen tip 120 can be secured. Electrical connection is sufficient.

Referring to FIG. 3, the pen tip 120 is composed of a support body 121 and a touch material layer 125. The touch material layer 125 is disposed on an outer surface of the support body 121. The support body 121 is made of a flexible material, and the touch material layer 125 is made of a flexible conductive material. The shape of the pen tip 120 can be designed according to actual needs, and can be a spherical shape, a tapered shape, a truncated cone shape or the like. In the embodiment, the writing head 120 has a conical shape. Since the pen tip 120 has flexibility, in use, the contact area between the pen tip 120 and the touch screen can be controlled by pressure, thereby controlling the size of the contact capacitance between the stylus pen 10 and the touch screen.

The support body 121 has a fixing portion 122 and a main body 124. The fixing portion 122 and the main body 124 may be an integrally formed solid solid structure. The outer surface of the fixing portion 122 is provided with an external thread, which is matched with the internal thread of the fixed end 114 of the pen holder 110, so that the pen tip 120 can be fixed to the fixed end 114 of the pen holder 110. The shape of the main body 124 can be designed according to actual needs, and can be spherical, tapered, rounded, or the like. The body 124 is used to set the touch material layer 125, and the touch material layer 125 may cover the whole body 124 or may partially cover it. The touch material layer 125 at least partially covers the connection between the fixing portion 122 and the main body 124, so that when the writing head 120 is mounted on the fixed end 114 of the pen holder 110, the material layer 125 and the pen holder are touched. 110 electrical connection.

The support body 121 is made of a flexible polymer material, and the flexible polymer material may be ruthenium rubber, polyurethane, polyethyl acrylate, polybutyl acrylate, polystyrene, polybutadiene, polyacrylonitrile, etc. One or a combination of several. The support body 121 may also be composed of a flexible polymer material having a relatively high dielectric constant, and the high dielectric constant flexible polymer material may be in a colloidal state. The support body 121 can also be a conductive polymer material. The conductive polymer material has a high dielectric constant. When used as the support body 121, the pen head 120 itself can have a large capacitance. The conductive polymer material may be polyaniline, polypyrrole or polythiophene. In this embodiment, the material of the support body 121 is ruthenium rubber.

Referring to FIG. 4, the support body 121 may also be a hollow structure support body 121. A closed space 126 may be formed in the interior of the body 124 to form a hollow structure of the tip 120. When the support body 121 is a hollow structure, its wall thickness can be selected to be 0.1 mm to 2 mm. When the support body 121 has a hollow structure, the flexibility of the pen tip 120 can be further improved.

Referring to FIG. 5, the touch material layer 125 may be formed on the outer surface of the main body 124 in a spiral strip shape. The spiral radius of the spiral strip-shaped touch material layer 125 gradually increases in the direction of the pen tip 110 toward the sheath 110. Specifically, the outer surface of the main body 124 may be provided with a spiral groove whose spiral radius extends spirally from the end of the main body 124 toward the fixing portion 122, and the spiral radius is small to large. The touch material layer 125 may be disposed within the spiral groove, and the thickness of the touch material layer 125 is greater than the groove depth such that the touch material layer 125 protrudes from the outer surface of the body 124 for Contact with the touch screen. Due to the spiral strip of touch material layer 125 The radius of the spiral gradually increases from the tip of the pen tip 120 toward the barrel. In use, as the pressure increases, the degree of bending of the tip 120 increases, and the area in which the touch material layer 125 contacts the touch screen substrate also gradually increases. Thereby, the size of the contact area with the touch screen can be controlled, thereby controlling the thickness of the stroke. Since the spiral strip-shaped touch material layer 125 only partially covers the surface of the body 124, the raw material is saved compared to completely covering the surface of the body 124. It can be understood that the surface of the main body 124 may not be provided with a spiral groove, and the spiral strip-shaped touch material layer 125 is directly disposed on the surface of the main body 124, and spirally extends from the end of the main body toward the fixing portion 122. And the radius of the spiral is small to large along the direction of the pen tip toward the sheath 110.

The layer of touch material 125 is used to contact the surface of the touch screen and form a contact capacitance therewith. The change in contact capacitance is achieved by a change in the contact area with the touch screen, so that the touch screen can sense the thickness of the stroke. The touch material layer 125 may have a thickness of 1 micrometer to 2 millimeters, and the touch material layer 125 has electrical conductivity. In order to increase the specific surface area of the touch material layer 125, the touch material layer 125 may be: a carbon nanotube, a graphene; a composite material composed of a carbon nanotube and a flexible polymer; and a graphene and a flexible polymer. Composite material; or a composite of carbon nanotubes and metal. The following will introduce the composite material formed by uniformly dispersing the carbon nanotubes in the flexible polymer matrix, and the carbon nanotube structure is arranged on the surface of the flexible polymer matrix to form a composite material, and each nanotube in the carbon nanotube structure The surface of the carbon nanotube is coated with a conductive layer, and the graphene is uniformly dispersed in the flexible polymer matrix or a composite material formed on the surface of the flexible polymer matrix.

Referring to FIG. 6, the touch material layer 125 may be composed of a carbon nanotube polymer composite. The carbon nanotube polymer composite material is composed of a flexible polymer matrix 24 and The plurality of carbon nanotubes 22 dispersed in the flexible polymer matrix 24 are composed of a plurality of carbon nanotubes 22. The plurality of carbon nanotubes 22 are uniformly dispersed in the flexible polymer matrix 24 and interconnected to form a conductive network. In order to achieve the formation of a conductive network in the flexible polymer matrix 24 of the carbon nanotubes 22, the mass percentage of the carbon nanotubes 22 should be greater than 5%. Since the carbon nanotubes 22 have a very large specific surface area and high electrical conductivity. When the pen tip 120 is in use, since the touch material layer 125 has a large specific surface area, more static charges conducted from the user's hand can be stored, thereby improving the contact capacitance between the pen tip 120 and the touch screen. . Further, the touch material layer 125 composed of the polymer composite material doped with the carbon nanotubes 22 and the touch panel constitute a larger capacitance per unit area, which is more sensitive. Moreover, since the carbon nanotube 22 is a hollow structure, it has a very small mass, and its special chemical bond structure allows the carbon nanotube 22 to have a very high strength and modulus of elasticity. In addition, since the carbon nanotubes 22 have a very large aspect ratio (greater than 1000:1), the carbon nanotubes 22 have very good flexibility, and the shape can be well restored after applying an external force. Therefore, the tip 120 composed of the polymer composite material formed by the carbon nanotube 22 and the flexible polymer matrix 24 has a lighter weight and a higher scratch resistance, thereby having a longer service life. A pen tip 120 composed of a polymer composite material composed of a dispersed carbon nanotube 22 disposed in the flexible polymer matrix 24 may have a portion of the carbon nanotube 22 outcrops from the outer surface of the polymer matrix 24, thereby being better. Contact with the touch screen, and because the carbon nanotube composite is softer than metal, it is not susceptible to damage to the touch screen.

The flexible polymer matrix 24 is a sheet having a thickness of between 1 micrometer and 2 millimeters. The flexible polymer matrix 24 is made of a flexible polymer material, and the flexible material is not limited in electrical conductivity as long as it has flexibility. The flexible polymer matrix 24 The material is a flexible polymer material such as a combination of one or more of ruthenium rubber, polyurethane, polyethyl acrylate, polybutyl acrylate, polystyrene, polybutadiene and polyacrylonitrile. In this embodiment, the material of the flexible polymer matrix 24 is ruthenium rubber.

Referring to FIG. 7, the touch material layer 125 may also be formed on the surface of the flexible polymer substrate 24 by a carbon nanotube structure 12 having a unitary structure. Referring to FIG. 8 , the carbon nanotube structure 12 having a monolithic structure may be disposed adjacent to the surface of the flexible polymer matrix 24 disposed in the flexible polymer matrix 24 . The surface of the carbon nanotube structure 12 disposed adjacent to the flexible polymer matrix 24 is disposed in the flexible polymer matrix 24, meaning that the carbon nanotube structure 12 is completely or partially embedded in the thickness direction thereof. In the polymer matrix 24, and when the carbon nanotube structure 12 is completely embedded in the flexible polymer matrix 24, the distance from the surface of the carbon nanotube structure 12 to one surface of the flexible polymer matrix 24 is 10 μm or less. Thereby ensuring that the layer of touch material 125 is electrically conductive.

The carbon nanotube structure 12 is a self-supporting structure. The so-called "self-supporting structure" means that the carbon nanotube structure can maintain its own specific shape without being supported by a support. The self-supporting structure of the carbon nanotube structure 12 includes a plurality of carbon nanotubes 22 that are attracted to each other by a van der Waals force so that the carbon nanotube structure 12 has a specific shape. Since the carbon nanotube structure 12 is self-supporting, a layered or linear structure can be maintained without being supported by the support. The carbon nanotube structure 12 has a large amount of gaps between the carbon nanotubes 22, so that the carbon nanotube structure 12 has a large number of pores, and the flexible polymer matrix 24 penetrates into the pores, and the nanocarbon The tube structure 12 is tightly coupled.

In the carbon nanotube polymer composite, the flexible polymer matrix 24 is filled in pores in the carbon nanotube structure 12. The flexible polymer matrix 24 is intimately bonded to the carbon nanotubes 22 in the carbon nanotube structure 12. The flexible polymeric matrix 24 encases the entire carbon nanotube structure 12. The carbon nanotube structure 12 maintains a layered structure in the flexible polymer matrix 24. The vertical distance from the surface of the flexible polymeric matrix 24 to the carbon nanotube structure 12 is greater than 0 microns and less than or equal to 10 microns.

The carbon nanotube structure 12 may be a carbon nanotube film, a carbon nanotube array, a carbon nanotube flocculation film or a carbon nanotube rolled film.

Referring to FIG. 9, the carbon nanotube film is a carbon nanotube film obtained by directly pulling from a carbon nanotube array. Each nano carbon tube is a self-supporting structure composed of a number of carbon nanotubes. The plurality of carbon nanotubes are arranged in a preferred orientation along substantially the same direction. The preferred orientation means that the majority of the carbon nanotubes in the carbon nanotube film extend substantially in the same direction. Moreover, the overall direction of extension of the majority of the carbon nanotubes is substantially parallel to the surface of the carbon nanotube film. Further, most of the carbon nanotubes in the carbon nanotube membrane are connected end to end by van der Waals force. Specifically, each of the carbon nanotubes in the majority of the carbon nanotube membranes extending in the same direction and the carbon nanotubes adjacent in the extending direction are connected end to end by van der Waals force. Of course, there are a few randomly arranged carbon nanotubes in the carbon nanotube film, and these carbon nanotubes do not significantly affect the overall orientation of most of the carbon nanotubes in the carbon nanotube film. The self-supporting carbon nanotube film does not require a large-area carrier support, but can maintain a self-membrane state as long as the supporting force is provided on both sides, that is, the carbon nanotube film is placed (or fixed on) When the two supports are placed at a fixed distance, the carbon nanotube film located between the two supports can be suspended to maintain the film itself. State. The self-supporting is mainly achieved by the presence of continuous carbon nanotubes extending through the end-to-end extension of the van der Waals force in the carbon nanotube film. The thickness of the carbon nanotube film is 0.5 nm to 100 μm, and the width is related to the size of the carbon nanotube array for pulling the carbon nanotube film, and the length is not limited. For the preparation method of the carbon nanotube film, please refer to the patent application "Nano Carbon Tube Membrane Structure", which was filed on February 12, 1996, in the Republic of China, No. 96105016, published on August 16, 1997. And its preparation method", applicant: Hon Hai Precision Industry Co., Ltd. In order to save space, only the above is cited, but all the technical disclosures of the above application are also considered as part of the technical disclosure of the present application. Since the carbon nanotubes in the above-mentioned carbon nanotube film are substantially aligned, when the carbon nanotube structure 12 formed by using the above-mentioned carbon nanotube film is applied to the touch material layer 125 of the pen head 120, the In the touch material layer 125, the carbon nanotubes can be aligned along the direction of the pen tip 120 toward the sheath 110, thereby improving the conductivity of the pen tip 120 in the direction of the sheath 110, so that the stylus 100 has a better response speed.

The carbon nanotube structure 12 can also be an array of carbon nanotubes. Referring to FIG. 10, the carbon nanotube array is disposed in a flexible polymer matrix 24, and the plurality of carbon nanotubes 22 in the array of carbon nanotubes have the same alignment direction. The surface angle of the carbon nanotubes 22 and the flexible polymer matrix 24 in the carbon nanotube array is not limited. Preferably, the carbon nanotubes 22 extend along the normal direction of the surface of the flexible polymer matrix 24. The distance between the roots of the carbon nanotubes 22 in the array of carbon nanotubes is greater than 0 and less than or equal to 1 micron. Thereby, a plurality of gaps are formed in the carbon nanotube array, the flexible polymer matrix 24 is filled in the gaps of the carbon nanotube array, and the flexible polymer matrix 24 is closely packed with the carbon nanotubes 22 in the carbon nanotube array. Combine. The surface of the flexible polymer matrix 24 is less than or equal to 10 micrometers on the surface of the carbon nanotube array, and the carbon nanotube polymer composite layer is The surface is still electrically conductive. Referring to FIG. 11, the carbon nanotubes 22 in the carbon nanotube array may be outcroped from the polymer matrix 24, and the length of the surface of the carbon nanotubes 22 exposed to the polymer matrix 24 is 10 micrometers or less.

Referring to FIG. 12, the carbon nanotube flocculation membrane is a carbon nanotube membrane formed by a flocculation method, and the carbon nanotube flocculation membrane comprises carbon nanotubes which are intertwined and uniformly distributed. The length of the carbon nanotubes is greater than 10 microns, preferably between 200 and 900 microns. The carbon nanotubes are attracted and entangled with each other by van der Waals force to form a network structure. The carbon nanotube flocculation membrane is isotropic. The carbon nanotubes in the carbon nanotube flocculation membrane are uniformly distributed, randomly arranged, and form a large number of pore structures, and the pore size is less than about 10 micrometers. The length and width of the carbon nanotube film are not limited. Referring to FIG. 12, since the carbon nanotubes are intertwined in the carbon nanotube flocculation membrane, the carbon nanotube flocculation membrane has good flexibility and is a self-supporting structure which can be bent and folded into Any shape without breaking. The area and thickness of the carbon nanotube film are not limited, and the thickness is 1 micrometer to 1 mm, preferably 100 micrometers. For the carbon nanotube flocculation membrane and the preparation method thereof, please refer to the patent application "Nano Carbon" of the No. 200844041 published by Fan Shoushan et al. on May 11, 1996 in the Republic of China on November 16, 1997. Method for preparing tube film", applicant: Hon Hai Precision Industry Co., Ltd. In order to save space, only the above is cited, but all the technical disclosures of the above application are also considered as part of the technical disclosure of the present application.

The carbon nanotube rolled film is a carbon nanotube film formed by rolling an array of carbon nanotubes. The carbon nanotube rolled film comprises uniformly distributed carbon nanotubes, and the carbon nanotubes are arranged in the same direction or in different directions. The carbon nanotubes can also be isotropic. The carbon nanotubes in the carbon nanotube rolled film partially overlap each other and pass through The tile forces are attracted to each other and tightly combined, so that the carbon nanotube structure has good flexibility and can be bent and folded into any shape without breaking. Moreover, since the carbon nanotubes in the carbon nanotube rolled film are attracted to each other by the van der Waals force, the carbon nanotube film is a self-supporting structure. The carbon nanotube rolled film can be obtained by rolling an array of carbon nanotubes. The carbon nanotubes in the carbon nanotube rolled film form an angle β with the surface of the growth substrate forming the carbon nanotube array, wherein β is greater than or equal to 0 degrees and less than or equal to 15 degrees, and the angle β is applied The pressure on the carbon nanotube array is related. The larger the pressure, the smaller the angle. Preferably, the carbon nanotubes in the carbon nanotube rolled film are aligned parallel to the growth substrate. The carbon nanotubes in the carbon nanotube rolled film have different arrangements depending on the manner of rolling. Referring to Figure 13, when rolled in the same direction, the carbon nanotubes are arranged in a preferred orientation along a fixed orientation. Referring to Figure 14, when rolled in different directions, the carbon nanotubes are arranged in a preferred orientation in different directions. When the nanotube array is vertically milled from above the array of carbon nanotubes, the nanotube-rolled membrane is isotropic. The length of the carbon nanotubes in the carbon nanotube rolled film is greater than 50 microns.

The area and thickness of the carbon nanotube rolled film are not limited, and may be selected according to actual needs, such as the time to be heated by the object to be heated. The area of the carbon nanotube rolled film is substantially the same as the size of the carbon nanotube array. The thickness of the carbon nanotube film is related to the height of the carbon nanotube array and the pressure of the rolling, and may be from 1 micrometer to 1 millimeter. It can be understood that the larger the height of the carbon nanotube array is, the smaller the applied pressure is, the larger the thickness of the prepared carbon nanotube rolled film is. On the contrary, the smaller the height of the carbon nanotube array is, the more the applied pressure is. Large, the smaller the thickness of the prepared carbon nanotube rolled film. The carbon nanotubes in the carbon nanotubes have a certain gap between adjacent carbon nanotubes, thereby grinding the carbon nanotubes in the carbon nanotubes A plurality of pores are formed in the film, and the pores have a size of less than about 10 microns. The carbon nanotube rolling film and the preparation method thereof are described in Fan Shoushan et al., which was filed on June 29, 1996, and published in the Republic of China on January 1, 1998, No. 200900348 Taiwan Patent Application "Nano Carbon" Method for preparing tube film", applicant: Hon Hai Precision Industry Co., Ltd. In order to save space, only the above is cited, but all the technical disclosures of the above application are also considered as part of the technical disclosure of the present application.

The carbon nanotube structure 12 can also be constructed from one or a plurality of nanocarbon lines 152. When the carbon nanotube structure 12 is composed of a nano carbon line 152, the one carbon carbon line 152 may be bent and disposed on the surface of the flexible polymer substrate 24 to form a planar shape having a certain area. Nano carbon tube structure 12. Referring to FIG. 15, when the carbon nanotube structure 12 includes a plurality of nanocarbon lines 152, the plurality of nanocarbon lines 152 may be disposed in parallel with each other. Referring to FIG. 16, when the carbon nanotube structure 12 includes a plurality of nanocarbon lines 152, the plurality of nanocarbon lines 152 may also cross each other to form a network of carbon nanotube structures 12. The nanocarbon line 152 can be a non-twisted nanocarbon line or a twisted nanocarbon line.

Referring to FIG. 17, the non-twisted nanocarbon pipeline includes a plurality of carbon nanotubes arranged along the length direction of the nanocarbon pipeline and connected end to end. Preferably, the non-twisted nanocarbon pipeline comprises a plurality of carbon nanotube segments, and the plurality of carbon nanotube segments are connected end to end by van der Waals force, and each of the carbon nanotube segments comprises a plurality of parallel and pass each other The silicon carbide tightly combined with the carbon nanotubes. The carbon nanotube segments have any length, thickness, uniformity, and shape. The non-twisted nano carbon line is not limited in length and has a diameter of 0.5 nm to 100 μm.

The twisted nano carbon pipeline uses a mechanical force to pull the carbon nanotube film at both ends Torque obtained in the opposite direction. Referring to FIG. 18, the twisted nanocarbon pipeline comprises a plurality of carbon nanotubes arranged in an axial spiral arrangement around the carbon nanotubes. Preferably, the twisted nanocarbon pipeline comprises a plurality of carbon nanotube segments, and the plurality of carbon nanotube segments are connected end to end by van der Waals force, and each of the carbon nanotube segments includes a plurality of parallel and pass each other The silicon carbide tightly combined with the carbon nanotubes. The carbon nanotube segments have any length, thickness, uniformity, and shape. The twisted nanocarbon line is not limited in length and has a diameter of 0.5 nm to 100 μm. The nano carbon pipeline and its preparation method can be found in Fan Shoushan et al., which was filed on November 5, 1991 in the Republic of China. No. I303239, announced on November 21, 1997, Taiwan’s patent "a carbon nanotube rope and Its manufacturing method", the patentee: Hon Hai Precision Industry Co., Ltd., and Taiwan No. I312337 announced on July 21, 1998, the Taiwan Announced Patent "Nano Carbon Pipe and Its Manufacturing Method", Patentee: Hon Hai Precision Industry Co., Ltd. In order to save space, only the above is cited, but all the technical disclosures of the above application are also considered as part of the disclosure of the present application.

Further, the twisted nanocarbon line can be treated with a volatile organic solvent. Under the action of the surface tension generated by the volatilization of the volatile organic solvent, the adjacent carbon nanotubes in the treated twisted nanocarbon pipeline are tightly bonded by van der Waals to make the diameter of the twisted nanocarbon pipeline and The specific surface area is further reduced, thereby further increasing its density and strength.

Since the nano carbon line is obtained by treating the above carbon nanotube film with an organic solvent or mechanical force, the carbon nanotube film is a self-supporting structure, so the nano carbon line is also a self-supporting structure. In addition, due to the gap between adjacent carbon nanotubes in the nanocarbon pipeline, the nanocarbon pipeline has a large number of pores, and the pore size is less than about 10 micrometers.

Referring to FIG. 19, in the embodiment, the touch material layer 125 may also be composed of the porous carbon nanotube composite material formed by the carbon nanotube structure 12 and the conductive material. The carbon nanotube structure 12 in the porous carbon nanotube composite material maintains its structure, and the surface of each of the carbon nanotube tubes 22 in the carbon nanotube structure 12 is coated with a conductive material layer 226. There is a gap between the carbon nanotubes 22 coated with the conductive material layer 226 in the porous carbon nanotube composite material. Therefore, the porous carbon nanotube composite material includes a plurality of micropores 225. The pores 225 have a pore diameter of 5 μm or less.

The conductive material layer 226 may be a conductive polymer layer, and the conductive polymer layer may be one or more of polyaniline, polypyrrole, polythiophene, polyacetylene, polyparaphenylene, and polyparaphenylene ethylene. . The thickness of the conductive polymer layer is preferably between 30 nm and 150 nm. In this embodiment, the conductive polymer layer has a thickness of 50 nm to 90 nm. The conductive polymer layer preferably has a mass percentage of 20% to 80% in the composite film composed of the carbon nanotube and the conductive polymer material. In this embodiment, the conductive polymer layer is a polyaniline layer, and the conductive polymer layer is coated on the surface of the disordered carbon nanotube network structure. The polyaniline has a relatively high dielectric constant, so the porous carbon nanotube composite material also has a high dielectric constant, so that the tip 120 composed of the porous carbon nanotube composite material has a large contact with the touch screen. Capacitance.

The material of the conductive material layer 226 may also be an elemental metal or a metal alloy, and the elemental metal may be copper, silver or gold. The conductive material layer 226 has a thickness of 1 to 20 nm. In this embodiment, the conductive material layer 226 is made of silver and has a thickness of about 5 nm.

Optionally, a further between the carbon nanotube 22 and the conductive material layer 226 may be included Wetting layer. The wetting layer functions to better bond the layer of conductive material 226 to the carbon nanotubes 22. The material of the wetting layer may be a metal such as nickel, palladium or titanium which is wettable with the carbon nanotubes 22 or an alloy thereof, and the wetting layer has a thickness of 1 to 10 nm.

Alternatively, in order to better bond the wetting layer and the conductive material layer 226, a transition layer may be further included between the wetting layer and the conductive material layer. The material of the transition layer may be a material which can be well combined with the material of the wetting layer and the material of the conductive layer, and the thickness of the transition layer is 1 to 10 nm.

In the carbon nanotube composite layer, after the carbon nanotube structure 12 is combined with the conductive material, the porous carbon nanotube composite material has better electrical conductivity, and the charge transfer speed is faster when contacting the touch screen. Therefore, the reaction speed of the touch screen stylus 10 can be improved. Since the porous carbon nanotube composite layer includes a plurality of micropores 225, the porous carbon nanotube composite material has a large specific surface area, so that the electrostatic charge transmitted by the user's hand can be stored more, thereby When the touch screen is in contact, a large contact capacitance can be generated, so that the sensitivity of the touch screen can be improved.

It can be understood that the touch material layer 125 of the pen tip 120 of the first embodiment of the present invention may also be composed of a pure carbon nanotube. The layer of contact material 125 on the surface of the tip 120 may be formed by wrapping the above-described carbon nanotube structure 12 on the surface of the body 124. Specifically, the carbon nanotube structure 12 may be wound around the outer surface of the body 124 and bonded to the body 124 by an adhesive, and the carbon nanotube structure 12 at least partially covers the fixing portion 122. So as to be electrically connected to the pen holder 110. Since the carbon nanotubes in the carbon nanotube structure 12 have a large specific surface area, the carbon nanotube structure 12 also has a large specific surface area. When the carbon nanotube structure 12 is in contact with the touch screen, a large contact capacitance can be generated, so that the stylus pen 10 has high sensitivity. In addition, nanocarbon The tube is relatively smooth and has a small coefficient of friction, which does not cause damage to the screen of the touch screen during use.

Referring to FIG. 20, the touch material layer 125 may also be formed by a graphene polymer composite material formed by dispersing graphene 28 in the material of the flexible polymer matrix 24. The graphene 28 is uniformly dispersed in the flexible polymer matrix 24. In the graphene polymer composite material, a part of the graphene 24 may also be outcroshed from the flexible polymer matrix 24 to expose the surface of the touch material layer 125. The volume percentage of the graphene 28 in the flexible polymer matrix 24 is from 10% to 60%. Referring to Fig. 21, the graphene 28 is a lamellar structure composed of a plurality of six-membered ring-shaped carbon atoms. The thickness of the graphene 28 is less than or equal to 100 nm. In the present embodiment, the thickness of the graphene 28 is from 0.5 nm to 100 nm. Graphene 28 has good electrical conductivity and it transfers electrons very rapidly at room temperature. Graphene 28 also has a large specific surface area and is flexible. Therefore, the graphene polymer composite material composed of the graphene 28 and the flexible polymer matrix 24 also has a large specific surface area and electrical conductivity. Therefore, the tip 120 formed of the above material is also compared with the capacitance per unit area formed by the touch panel. Large and has good electrical conductivity, the tip 120 has higher sensitivity.

In this embodiment, a raw material of graphene 28 is prepared by a chemical dispersion method. The chemical dispersion method combines graphite oxide and water in a ratio of 1 mg: 1 mL, and shakes with ultrasonic waves until the solution is clear and free of particulate matter. After adding an appropriate amount of rhodium at 100 ° C for 24 h, a black granular precipitate is produced, and the graphite is obtained by filtration and drying. Alkene powder. A pen tip 120 composed of a graphene polymer composite material composed of a dispersed graphene 28 disposed in a flexible polymer matrix 24 may have a portion of the graphene 28 outcrops from the outer surface of the pen tip, thereby being better. Contact with the touch screen. Moreover, the graphene 28 is relatively smooth and has a small coefficient of friction, and does not cause damage to the screen of the touch screen during use.

Referring to FIG. 22, the touch material layer 125 in the first embodiment of the present invention may be formed by covering the surface of the flexible polymer substrate 24 with the graphene layer 28 to form a graphene layer 280. The graphene layer 280 has a thickness of from 100 nanometers to 1 micrometer. The graphenes 28 in the graphene layer 280 may be arranged in an overlapping manner, arranged side by side, or overlapped with each other. Graphene has good electrical conductivity and it delivers electrons very quickly at room temperature. The graphene layer 280 has a thickness of a single layer of graphene to a thickness of 1 mm. In this embodiment, a graphene material is prepared by a chemical dispersion method. The chemical dispersion method combines graphite oxide and water in a ratio of 1 mg: 1 mL, and shakes with ultrasonic waves until the solution is clear and free of particulate matter. After adding an appropriate amount of rhodium at 100 ° C for 24 h, a black granular precipitate is produced, and the graphite is obtained by filtration and drying. Alkene powder. After the graphene 28 is obtained, the flexible polymer matrix 24 is placed in the graphene powder. Since the graphene 28 is a nano material, it has a certain adhesion and can adhere to the surface of the flexible polymer matrix 24 to form. Graphene layer 280. It can be understood that the graphene 28 can also be fixed to the surface of the flexible polymer matrix 24 by an adhesive to form the graphene layer 280.

It can be understood that the touch material layer 125 can also be composed of a graphene material layer formed by directly covering the surface of the main body 124 by the graphene 28 . The graphene material layer has a thickness of from 100 nanometers to 1 micrometer. The graphene in the graphene layer may be arranged in an overlapping manner, arranged side by side, or overlapped with each other. Graphene has good electrical conductivity and it delivers electrons very quickly at room temperature. The graphene has a thickness of from 0.5 nm to 100 nm.

Referring to FIG. 23, a second embodiment of the present invention provides a stylus pen 200. 200 includes a pen holder 110 and a pen tip 220. The main difference between the embodiment and the stylus 100 of the first embodiment is that the tip 220 of the stylus 200 is a solid structure composed of the same material. The material of the pen tip 220 may be selected from any material other than pure graphene in the material constituting the touch material layer 125 in the first embodiment, and the specific material of the touch material layer 125 may be referred to the details of the first embodiment. Record, no longer repeat here.

When the tip 220 of the stylus pen 200 in the second embodiment of the present invention is composed of a pure carbon nanotube, it can be formed by a stamper. Specifically, the carbon nanotube structure 12 in the first embodiment can be placed as a raw material in a mold. This was hot press molded to obtain a pen tip 220 composed of a pure carbon nanotube. Since the carbon nanotube structure 12 is a complete structure formed by interconnecting a plurality of carbon nanotubes by van der Waals force, and also includes a large number of micropores. Therefore, the tip made of pure carbon nanotubes also includes a large number of micropores. Since the carbon nanotube has good electrical conductivity and flexibility, the tip 220 also has good electrical conductivity and flexibility. The tip 220 has a large number of micropores, the diameter of which is less than 10 microns, so that the tip 220 has a larger pen surface area, so that it can store more charge and has a larger capacitance. In addition, in order to improve the conductivity between the pen tip 220 and the pen holder 110, the carbon nanotube tube in the pen tip 220 composed of the pure carbon nanotube tube may be directed along the pen tip 220 toward the pen holder 110, that is, the pen holder 110. The axial arrangement has a higher electrical conductivity in the axial direction of the carbon nanotube, so that the tip 220 has a higher conductivity in the direction of the sheath 110, so that the tip 220 has a better response speed. The carbon nanotubes may be single-walled, double-walled or multi-walled carbon nanotubes, preferably multi-walled carbon nanotubes.

Referring to FIG. 24, in the embodiment, the shape of the pen tip 220 is different from that in the first embodiment. In addition to any of the shapes described above, it is also possible to assemble into a brush shape by a linear conductive material. The material of the brush-like pen tip 220 may be formed by assembling a plurality of nano carbon line-like structures 25 into a bundle. The plurality of nanocarbon line-like structures 25 may be adhered to each other by an adhesive to form the pen tip 220. The pen tip 220 has a fixing portion 222 and a touch portion 224. The fixing portion 222 is configured to fix the pen tip 220 to the pen holder 110, and the touch portion 224 is used to contact the touch screen.

Specifically, each of the above-described nanocarbon line-like structures 25 has a fixed end 252 and a touch end 254 remote from the fixed end 252. The fixed ends 252 of the plurality of nanocarbon line-like structures 25 are aligned with each other and adhered together by an adhesive to form the fixing portion 222. The length distribution of the plurality of nanocarbon line-like structures 25 has a certain regularity, and the central axis of the pen tip 220 is outwardly decreased along the radius of the pen tip. The above distribution law ensures that the writing head is in the shape of a brush. The portion of the plurality of carbon-carbon line-like structures 25 away from the fixed end 252 is a touch end 254, and the touch ends 254 of the plurality of carbon-carbon line-like structures 25 are adhered together by an adhesive to form a touch of the pen head 220. Part 224. In this embodiment, the fixing portion 222 of the pen tip 220 is directly inserted into the fixed end 114 of the pen holder 110, and the pen tip 220 is adhered to the fixed end 114 of the pen holder 110 by a conductive adhesive.

The nanocarbon line-like structure 25 can be the non-twisted nanocarbon line of Figure 17, or the twisted nanocarbon line of Figure 18. The nanocarbon line-like structure 25 may also be a carbon nanotube composite line formed on the basis of the above-described non-twisted nanocarbon line and twisted nanocarbon line. The carbon nanotube composite wire is composed of a polymer material infiltrated into a gap between the carbon nanotubes of the nano carbon pipeline, and the polymer may include polyacrylonitrile (PAN), polyvinyl alcohol (polyvinyl alcohol, Any one or any combination of PVA), Polypropylene (PP), Polystyrene (PS), Polyvinylchlorid (PVC), and Polyethylene terephthalate (PET) . For the preparation method of the above-mentioned carbon nanotube composite line, refer to the application method of "Nano Carbon Tube Composite Structure", which is applied for by Taiwan Patent Application No. 99122581, which is applied by Fan Shoushan et al. Hon Hai Precision Industry Co., Ltd. In order to save space, only the above is cited, but all the technical disclosures of the above application are also considered as part of the technical disclosure of the present application.

In addition, the above-mentioned carbon nanotube composite wire may also be a carbon nanotube metal composite wire having a twisted or non-twisted structure of a carbon nanotube, the carbon nanotube metal composite wire being in the above non-twisted nano carbon pipeline and a carbon nanotube metal composite wire formed on the basis of a twisted nanocarbon pipeline, the arrangement tendency of the carbon nanotubes in the above-mentioned carbon nanotube metal composite wire with the non-twisted nanocarbon pipeline and the twisted nene The carbon carbon pipeline is the same, and the surface of all the carbon nanotubes or some of the carbon nanotubes is coated with a metal material layer. The structure and preparation method of the above-mentioned carbon nanotube metal composite wire can be referred to Fan Shoushan et al. on the 7th of the Republic of China on the 7th of the Republic of China, published on September 16, 1998, the Taiwan Patent Application No. 200939249, the preparation of the stranded wire. Method", applicant: Hon Hai Precision Industry Co., Ltd. You can also refer to the patent application "Twisted Wire" of the Taiwan Patent Application No. 200938481, which was filed on March 16, 1997 by Fan Shoushan and others. The applicant: Hon Hai Precision Industry Co., Ltd. The technical content disclosed in the above application is also considered to be part of the disclosure of the technology of the present application.

Referring to FIG. 25, a third embodiment of the present invention provides a stylus 300, the stylus 300 includes a pen holder 110 and a pen tip 320. The main difference between this embodiment and the first embodiment is that the pen head 320 is a hollow structure composed of the same material. The pen head 320 has a fixing portion 322 and a touch portion 324. The fixing portion 322 is for fixing the pen head 320 to the pen holder 110, and the touch portion 324 is for contacting the touch screen.

The fixing portion 322 and the touch portion 324 may be integrally formed to constitute the pen tip 320. The fixing portion 322 is provided with an external thread for the outer surface, and the external thread is just matched with the internal thread of the fixed end 114 of the pen holder 110, so that the pen tip 120 can be fixed to the fixed end 114 of the pen holder 110. The touch portion 324 is surrounded by a flexible conductive material, and the touch portion 324 defines a closed space 326. The flexible conductive material forms a hollow contact portion 324 around the enclosed space 326. The shape of the touch portion 324 is not limited, and may be designed according to actual needs, and may be a spherical shape, a tapered shape, a truncated cone shape or the like. In the present embodiment, the flexible conductive material constituting the fixing portion 322 and the touch portion 324 of the pen tip 320 is completely the same as the material of the touch material layer 125 in the first embodiment. The specific material of the touch material layer 125 has been described in detail in the first embodiment and will not be described herein.

In addition, a liquid having a higher dielectric constant such as water or an ionic solution may be added to the enclosed space 326 of the pen tip 320. It is used to increase the capacitance of the touch portion 324 of the pen tip 320.

Compared with the prior art, since graphene has very good electrical conductivity, large specific surface area and good flexibility, the contact capacitance of the stylus pen of the present invention is in contact with the capacitive touch screen. Large, with high sensitivity. In addition, since the graphene has a smaller friction coefficient than the metal, the tip is less likely to damage the touch screen.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧ stylus

110‧‧‧ pen

120‧‧‧ pen head

Claims (13)

  1. A stylus pen includes a pen holder and a pen tip, wherein the pen tip has flexibility and conductivity, and the pen tip forms a contact capacitance with the touch screen when used, and the improvement is that the pen tip comprises a flexible polymer matrix and is dispersed in the flexible high Graphene in a molecular matrix, the graphene portion emerging from the surface of the tip.
  2. The stylus according to claim 1, wherein the pen tip is fixed to the pen holder, and the pen holder is electrically conductive and electrically connected to the pen tip.
  3. The stylus according to claim 1, wherein the flexible polymer matrix material is ruthenium rubber, polymethyl methacrylate, polyurethane, epoxy resin, polyethyl acrylate, polyacrylic acid butyl acrylate A combination of one or more of ester, polystyrene, polybutadiene, polyacrylonitrile, polyaniline, polypyrrole, and polythiophene.
  4. The stylus according to claim 1, wherein the volume percentage of the graphene in the flexible polymer matrix is 10% to 60%.
  5. The stylus according to claim 1, wherein the graphene has a thickness of 100 nm or less.
  6. The stylus according to claim 1, wherein the pen tip is spherical, conical, or truncated.
  7. The stylus according to claim 1, wherein the pen holder is a hollow cylindrical structure made of a metal material.
  8. The stylus according to claim 7, wherein the pen holder has a fixed end, and the fixed end is internally provided with an internal thread, and the pen tip is fixed to the fixed end by the internal thread.
  9. A stylus pen includes a pen holder and a pen tip, wherein the pen tip has flexibility and conductivity, and the pen tip forms a contact capacitance with the touch screen during use, wherein the pen tip comprises a support body and a surface disposed on the surface of the support body. Touching the material layer, the touch material layer is composed of a flexible polymer matrix and graphene dispersed in a flexible polymer matrix, the graphene portion emerging from the surface of the flexible polymer matrix.
  10. The stylus according to claim 9, wherein the pen tip is fixed to the pen holder, and the pen holder is electrically conductive and electrically connected to the pen tip.
  11. The stylus according to claim 9, wherein the layer of the touch material is in the form of a spiral ribbon and spirally wound around the surface of the support.
  12. The stylus according to claim 11, wherein the spiral radius of the spiral strip-shaped touch material layer gradually increases from the tip of the pen to the direction of the sheath.
  13. The stylus according to claim 9, wherein the support material is ruthenium rubber, polyurethane, polyethyl acrylate, polybutyl acrylate, polystyrene, polybutadiene, and polypropylene. A combination of one or more of the nitriles.
TW99146747A 2010-12-30 2010-12-30 Touch pen TWI420353B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5067573A (en) * 1989-12-27 1991-11-26 Sony Corporation Hand-writing input apparatus
TWM260799U (en) * 2004-07-16 2005-04-01 Hon Hai Prec Ind Co Ltd Multi-function touching and controlling pen
TW200923733A (en) * 2007-11-19 2009-06-01 Inventec Appliances Corp Stylus pen applicable to capacitive touch panel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5067573A (en) * 1989-12-27 1991-11-26 Sony Corporation Hand-writing input apparatus
TWM260799U (en) * 2004-07-16 2005-04-01 Hon Hai Prec Ind Co Ltd Multi-function touching and controlling pen
TW200923733A (en) * 2007-11-19 2009-06-01 Inventec Appliances Corp Stylus pen applicable to capacitive touch panel

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