Method for fabricating thin sheets of glass

Information

  • Patent Grant
  • 9615448
  • Patent Number
    9,615,448
  • Date Filed
    Friday, March 14, 2014
    10 years ago
  • Date Issued
    Tuesday, April 4, 2017
    7 years ago
Abstract
Fabrication of thin sheets of glass or other substrate material for use in devices such as touch sensor panels is disclosed. A pair of thick glass sheets, typically with thicknesses of 0.5 mm or greater each, may each be patterned with thin film on a surface, sealed together to form a sandwich with the patterned surfaces facing each other and spaced apart by removable spacers, either or both thinned on their outside surfaces to thicknesses of less than 0.5 mm each, and separated into two thin glass sheets. A single thick glass sheet, typically with a thickness of 0.5 mm or greater, may be patterned, covered with a protective layer over the pattern, thinned on its outside surface to a thickness of less than 0.5 mm, and the protective layer removed. This thinness of less than 0.5 mm may be accomplished using standard LCD equipment, despite the equipment having a sheet minimum thickness requirement of 0.5 mm.
Description
FIELD OF THE INVENTION

This relates generally to the fabrication of thin sheets of substrate material, and more particularly, to the fabrication of thin sheets of glass.


BACKGROUND OF THE INVENTION

The standard process for fabricating LCD panels involves, inter alia, sealing two transparent substrates together to form a sandwich for depositing liquid crystal therebetween, thinning the sandwich to an appropriate LCD panel thickness, and depositing thin film on the outside surfaces of the sandwich. Conventional substrates are made from sheets of glass or some other transparent material. In order to withstand the chemical and mechanical rigors of fabrication without deformation or damage, a conventional sheet is generally at least 0.5 mm thick. Because 0.5 mm is the thinnest dimension for the sheets being used, standard LCD fabrication equipment has been designed to have a minimum thickness tolerance of 0.5 mm. This means that any sheet fabricated using standard LCD technology should have a thickness of at least 0.5 mm in order to be handled properly.


In recent years, touch sensor panels, touch screens, and the like have become available as input devices. Touch screens, in particular, are becoming increasingly popular because of their ease and versatility of operation as well as their declining price. Touch screens can include a touch sensor panel, which can be a clear panel with a touch-sensitive surface, and a display device, such as an LCD panel, that can be positioned partially or fully behind the touch sensor panel so that the touch-sensitive surface can cover at least a portion of the viewable area of the display device. Touch screens can allow a user to perform various functions by touching the touch sensor panel using a finger, stylus or other object at a location dictated by a user interface (UI) being displayed by the display device. In general, touch screens can recognize a touch event and the position of the touch event on the touch sensor panel, and a computing system can then interpret the touch event in accordance with the display appearing at the time of the touch event, and thereafter can perform one or more actions based on the touch event.


Like LCD panels, touch sensor panels in touch screens may be made of glass or other suitable transparent material. However, unlike LCD panels, touch sensor panels may be generally very thin, much more so than LCD panels. Fabrication technology can be similar for both touch sensor panels and LCD panels. However, due to touch sensor panel thinness, difficulties can occur in fabricating them using the same equipment as that used for LCD fabrication because the touch sensor panels may not fit the equipment and/or may be too fragile to withstand the rigors of the fabrication process. As such, equipment specifically designed for fabricating touch screen panels may be needed, which can be very expensive.


SUMMARY

This relates to the fabrication of thin sheets of glass or other substrate material for use in devices such as touch sensor panels. In some embodiments, fabrication can be achieved using standard LCD technology. Standard equipment for fabrication of LCD panels has been designed with a minimum thickness tolerance of 0.5 mm. This is because glass (or other transparent material) used to fabricate LCD panels should be at least 0.5 mm thick in order to withstand the rigors of fabrication. Thinner glass would be subject to deformation or damage.


To fabricate thin sheets of glass, a pair of thick glass sheets may be provided, typically with thicknesses of 0.5 mm or greater each. Patterns of thin film may be deposited on a surface of each glass sheet for use as conductive traces, anti-reflective material, and/or protective layering, for example. The pair of thick glass sheets may be sealed together to form a sandwich with their patterned surfaces facing each other and separated by removable spacers. Either or both of the sandwiched thick glass sheets may be thinned on their respective outside surfaces to thicknesses of less than 0.5 mm each. The sandwich of now thin glass sheets may be separated from each other. Either or both sheets may have thicknesses less than the minimum thickness requirement for standard LCD equipment, yet be fabricated using that same equipment.


To fabricate thin sheets of glass, a thick glass sheet may be provided, typically with a thickness of 0.5 mm or greater. Patterns of thin film may be deposited on a surface of the glass sheet for use as described previously. A removable protective layer may be placed over the patterned thin film. The thick glass sheet may be thinned on its outside surface opposite the protective layer surface to a thickness of less than 0.5 mm. The protective layer may be removed. The sheet may have a thickness less than the minimum thickness requirement for standard LCD equipment, yet be fabricated using that same equipment.





BRIEF DESCRIPTION OF THE DRAWINGS


FIG. 1a illustrates an exemplary pair of thick glass sheets patterned with thin film on a surface according to embodiments of the invention.



FIG. 1b illustrates an exemplary pair of thick glass sheets which are sealed together with their patterned surfaces facing each other and separated by spacers to form a sandwich according to embodiments of the invention.



FIG. 1c illustrates an exemplary sandwich of patterned glass sheets which has been thinned on outside surfaces according to embodiments of the invention.



FIG. 1d illustrates an exemplary sandwich of thin patterned glass sheets which has been coated with thin film on outside surfaces according to embodiments of the invention.



FIG. 1e illustrates an exemplary pair of thin glass sheets which are coated with thin film on one surface and patterned with thin film on the opposite surface according to embodiments of the invention.



FIG. 2 illustrates an exemplary method for fabricating a pair of thin glass sheets according to embodiments of the invention.



FIG. 3a illustrates an exemplary thick glass sheet patterned with thin film on a surface according to embodiments of the invention.



FIG. 3b illustrates an exemplary thick glass sheet patterned with thin film on a surface and with a protective layer of material overlaying the thin film pattern according to embodiments of the invention.



FIG. 3c illustrates an exemplary thick glass sheet patterned with thin film on a surface and with a protective layer of material overlaying the thin film pattern, where the outside surfaces of the sheet and the layer have been thinned according to embodiments of the invention.



FIG. 3d illustrates an exemplary thin patterned glass sheet with a thin protective layer of material thereon, where the sheet has been coated with thin film on the outside surface according to embodiments of the invention.



FIG. 3e illustrates an exemplary thin glass sheet which is coated with thin film on a surface and patterned with thin film on the opposite surface according to embodiments of the invention.



FIG. 4 illustrates an exemplary method for fabricating a thin glass sheet according to embodiments of the invention.



FIG. 5a illustrates an exemplary digital media player having a touch sensor panel that includes a thin glass sheet according to embodiments of the invention.



FIG. 5b illustrates an exemplary mobile telephone having a touch sensor panel that includes a thin glass sheet according to embodiments of the invention.



FIG. 6 illustrates an exemplary computing system including a touch sensor panel utilizing a thin glass sheet according to embodiments of the invention.





DETAILED DESCRIPTION

In the following description of preferred embodiments, reference is made to the accompanying drawings which form a part hereof, and in which it is shown by way of illustration specific embodiments in which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the preferred embodiments of the invention.


This relates to the fabrication of thin sheets of glass or other substrate material for use in devices such as touch sensor panels. In some embodiments, fabrication can be achieved using standard LCD technology. Standard equipment for fabrication of LCD panels has been designed with a minimum thickness tolerance of 0.5 mm. This is because glass (or other transparent material) used to fabricate LCD panels should be at least 0.5 mm thick in order to withstand the rigors of fabrication. Thinner glass would be subject to deformation or damage.


Touch sensor panels may be significantly thinner than LCD panels, but use similar fabrication methods. Therefore, using standard LCD technology to fabricate touch sensor panels may substantially save time, cost, and labor. However, to do so, the touch sensor panels should meet the minimum thickness tolerance of LCD equipment. One way to do so may be by forming a sandwich of two sheets such that the combined thickness of the sandwich during fabrication does not drop below 0.5 mm. As such, each sheet in the sandwich can be thinned during fabrication to a thickness of less than 0.5 mm. Another way to do so may be by applying a protective layer to a sheet such that the combined thickness during fabrication does not drop below 0.5 mm. As such, the sheet can be thinned during fabrication to a thickness of less than 0.5 mm. After thinning, the sheets can be separated, resulting in separate sheets that are thinner than could be achieved had the sandwich not been formed. This process can result in thin glass sheets suitable for touch sensor panels. Moreover, for the pairs of sheets, the throughput may increase substantially because two thin sheets may be processed at once.


Although embodiments of this invention are described and illustrated herein in terms of touch sensor panels with glass substrates, it should be understood that embodiments of this invention are not so limited to such panels and substrates, but is generally applicable to panels utilizing other touch and proximity sensing technologies, and any substrate for which thinness is required.



FIG. 1a illustrates an exemplary pair of thick glass sheets patterned with thin film on a surface according to embodiments of the invention. In the example of FIG. 1a, thick glass sheet 100-a may have a thickness of d1a and thick glass sheet 100-b may gave a thickness of d1b. Thicknesses d1a and d1b may or may not be the same. Conventional thick glass sheets may typically be 0.5 mm thick or greater.


Patterns of thin film 105-a may be deposited on a surface of glass sheet 100-a. Similarly, patterns of thin film 105-b may be deposited on a surface of glass sheet 100-b. The thin film patterns may be used as conductive traces for carrying signals and may include transparent materials, such as indium tin oxide (ITO). Alternatively or additionally, the thin film patterns may be used as an anti-reflective layer to minimize reflection off the glass sheet surface and may include anti-reflective material. Alternatively or additionally, the thin film patterns may be used as a protective layer and may include ceramic material or any other material with similar protective properties. The type of thin film used may depend on the ultimate use of the fabricated thin glass sheet.



FIG. 1b illustrates an exemplary pair of thick glass sheets which are sealed together with their patterned surfaces facing each other and separated by spacers to form a sandwich according to embodiments of the invention. In the example of FIG. 1b, thick glass sheets 100-a and 100-b of FIG. 1a, for example, may be temporarily joined together at their edges using any known method for doing so. For example, the edges of glass sheets 100-a and 100-b may be laminated together using any known laminate. Glass sheets 100-a and 100-b may be joined together with their patterned surfaces facing each other. Removable spacers 110 may be placed between the patterned surfaces to keep them apart. Spacers 110 may include any material that can maintain space between glass sheets 100-a and 100-b and that does not interact with the glass sheets and patterns 105-aand 105-b. Alternatively, a removable sealant may be placed between the patterned surfaces to keep them apart.



FIG. 1c illustrates an exemplary sandwich of patterned glass sheets which have been thinned on outside surfaces according to embodiments of the invention. In the example of FIG. 1c, thick glass sheets 100-a and 100-b of FIG. 1b, for example, that are sandwiched together may be thinned from respective thicknesses of d1a and d1b to thicknesses of d2a and d2b, where d2a<d1a and d2b<d1b. For example, conventional thick glass sheets having thicknesses of 0.5 mm or more each may be thinned to thicknesses of less than 0.5 mm each. The thinning process may include chemical etching, mechanical polishing, a combination of the two, and any other known methods for thinning glass sheets. One or both outside surfaces of the sandwich, i.e., the surfaces of glass sheets 100-a and 100-b opposite the patterned surfaces, may be thinned. Since patterns 105-aand 105-b may be sealed within the sandwich on inside surfaces, the patterns may be protected from deformation or damage during the thinning process. As a result of the thinning process, each glass sheet 100-a and 100-b can have a thickness less than the minimum thickness requirement of 0.5 mm for standard LCD equipment; while the sandwich of the glass sheets maintains a thickness at or above the requirement.



FIG. 1d illustrates an exemplary sandwich of thin patterned glass sheets which have been coated with thin film on outside surfaces according to embodiments of the invention. In the example of FIG. 1d, the thinned outside surfaces of the sandwich of thin glass sheets 100-a and 100-b of FIG. 1c, for example, may be coated with additional thin film material. Thin film coating 115-a may coat the thinned surface of glass sheet 100-a with a coating layer thickness of d3a. Thin film coating 115-b may coat the thinned surface of glass sheet 100-b with a coating layer thickness of d3b. The thin film material used to coat the thinned outside surfaces of the sandwich of thin glass sheets 100-a and 100-b may be similar to the thin film material used to form patterns 105-a and 105-bdescribed above. This can provide double thin filming—the thin film pattern on one surface and the thin film coating on the opposite surface. This coating may be either a complete layer or just a pattern, depending on the particular implementation for the glass sheets. Alternatively, this coating may be optional, thereby providing single thin filming—the thin film pattern on one surface.



FIG. 1e illustrates an exemplary pair of thin glass sheets which are coated with thin film on one surface and patterned with thin film on the opposite surface according to embodiments of the invention. In the example of FIG. 1e, the sandwich of thin glass sheets 100-a and 100-b of FIG. 1d, for example, may be separated to form separate sheets. Thin glass sheet 100-a may have a thin film layer 115-a on one surface and a thin film pattern 105-a on the opposite surface, where the glass sheet may have a thickness of less than 0.5 mm. Similarly, thin glass sheet 100-b may have a thin film layer 115-b on one surface and a thin film pattern 105-b on the opposite surface, where the glass sheet may have a thickness of less than 0.5 mm. Here, both sheets 100-a and 100-b may have thicknesses less than the minimum thickness requirement for standard LCD equipment, yet have been fabricated using that same equipment.


To separate the sandwich to form separate thin glass sheets 100-a and 100-b, the sealed edges of the sheets may be cut from the sandwich and spacers 110 removed. Other mechanical methods may be used to separate the glass sheets. Alternatively, chemical methods may be used, e.g., delamination to remove a laminate that formed the seal. A combination of mechanical and chemical methods may also be used.


In an example, as shown in FIGS. 1a-1e, two thick sheets of glass, each having a thickness of about 0.5 mm could be joined to form a sandwich having a thickness of about 1.0 mm. The sandwich could be thinned to a thickness of about 0.6 mm. After the sandwich is separated, each glass sheet could have a thickness of about 0.3 mm, which would be well below the minimum thickness requirement of standard LCD equipment.


It is to be understood that the thickness of a thin glass sheet is not limited to that described here, but may include any thickness below the minimum thickness requirement of the LCD equipment that may be suitable for touch sensor panels or other devices.



FIG. 2 illustrates an exemplary method for fabricating a pair of thin glass sheets according to embodiments of the invention. Optionally using standard LCD technology, a standard LCD thin film deposition tool may be used to place a thin film pattern on a surface of a thick glass sheet (205). The thick glass sheets may have a thickness of 0.5 mm or more each to meet the minimum thickness requirement of standard LCD equipment. This deposition may be repeated for multiple sheets. A standard LCD sealing tool may be used to join a pair of the patterned thick glass sheets together to form a sandwich, with the patterned surfaces facing each other and with removable spacers placed between the patterned surfaces (210). The sandwich may have a thickness of 1.0 mm or more, which also meets the minimum thickness requirement of standard LCD equipment. A standard LCD thinning tool may be used to thin one or both outside surfaces of the sandwich, where the thicknesses of one or both glass sheets may each be thinned to less than 0.5 mm (215). Here, the thinned sandwich may have a thickness of 0.5 mm or more, depending on how thin the sheets are fabricated, which still meets the minimum thickness requirement of standard LCD equipment. The standard LCD thin film deposition tool may be used again to coat the thinned outside surface of the sandwich (220) to complete the standard LCD fabrication process.


After completing the standard LCD fabrication process, unlike LCD panels, the sandwich of thin glass sheets may now be separated into separate glass sheets. Any suitable unsealing tool known to those skilled in the art may be used to separate the pair of patterned thin glass sheets into separate glass sheets (225). The resulting thin glass sheet or sheets may have a thickness of less than 0.5 mm, which is below the minimum thickness requirement of standard LCD equipment, yet still advantageously have been fabricated using that equipment.



FIG. 3a illustrates an exemplary thick glass sheet patterned with thin film on a surface according to embodiments of the invention. In the example of FIG. 3a, thick glass sheet 300 may have a thickness of d1. Conventional thick glass sheets may typically be 0.5 mm or greater in thickness.


Patterns of thin film 305 may be deposited on a surface of glass sheet 300. As mentioned previously, the thin film patterns may be used as conductive traces for carrying a signal and may include semiconductor materials. Alternatively or additionally, the thin film patterns may be used as an anti-reflective layer to minimize reflection off the glass sheet surface and may include anti-reflective material. Alternatively or additionally, the thin film patterns may be used as a protective layer and may include ceramic, organic, or any other materials with such protective properties.



FIG. 3b illustrates an exemplary thick glass sheet patterned with thin film on a surface and with a protective layer of material overlaying the thin film pattern according to embodiments of the invention. In the example of FIG. 3b, thick glass sheet 300 of FIG. 3a, for example, may have removable protective layer 310 of thickness d2 overlaying patterns 305 on the surface of the thick glass sheet. Protective layer 310 may be any material that is capable of withstanding the standard LCD fabrication equipment and that does not interact with glass sheet 300 and patterns 305. The thickness of protective layer 310 may be any value that would ensure that the combined layer and sheet meets the minimum thickness requirement of the standard LCD equipment. For example, the thickness d2 may be 0.5 mm or more. Protective layer 310 may protect patterns 305 from deformation or damage during the fabrication process.



FIG. 3c illustrates an exemplary thick glass sheet patterned with thin film on a surface and with a protective layer of material overlaying the thin film pattern, where the outside surfaces of the sheet and the layer have been thinned according to embodiments of the invention. In the example of FIG. 3c, thick glass sheet 300 of FIG. 3b, for example, may be thinned from a thickness of d1 to a thickness of d3, where d3<d1. The surface of glass sheet 300 opposite the surface having protective layer 310 may be thinned. For example, conventional thick glass sheets having thicknesses of 0.5 mm or more each may be thinned to thicknesses of less than 0.5 mm each. The thinning process may include chemical etching, mechanical polishing, a combination of the two, and any other known methods for thinning glass sheets. Optionally, protective layer 310 may also be thinned concurrently with glass sheet 300 from a thickness of d2 to a thickness of d4, where d4<d2. Glass sheet 300 can have a thickness less than the minimum thickness requirement of 0.5 mm for standard LCD equipment; while the combined sheet 300 and layer 310 maintains a thickness at or above the requirement.



FIG. 3d illustrates an exemplary thin patterned glass sheet with a thin protective layer of material thereon, where the sheet has been coated with thin film on the outside surface of the sheet according to embodiments of the invention. In the example of FIG. 3d, the thinned outside surface of thin glass sheet 300 of FIG. 3c, for example, may be coated with additional thin film material. Thin film coating 315 may coat the thinned surface of glass sheet 300 with a coating layer thickness of d5. The thin film material used to coat the thinned outside surface of thin glass sheet 300 may be similar to the thin film material used to form patterns 305 described above. This may provide double thin filming—the thin film pattern on one surface and the thin film coating on the opposite surface. This coating may be either a complete layer or just a pattern, depending on the particular implementation for the glass sheet. Alternatively, this coating may be optional, thereby providing single thin filming—the thin film pattern on one surface.



FIG. 3e illustrates an exemplary thin glass sheet which is coated with thin film on a surface and patterned with thin film on the opposite surface according to embodiments of the invention. In the example of FIG. 3e, protective layer 310 on thin glass sheet 300 of FIG. 3d, for example, may be removed, leaving the thin glass sheet remaining. To remove protective layer 310 from thin glass sheet 300, any suitable chemical or mechanical method known to those skilled in the art, or combination thereof, may be used that is capable of removing such a layer. Thin glass sheet 300 may have a thin film layer 315 on one surface and a thin film pattern 305 on the opposite surface, where the glass sheet may have a thickness of less than 0.5 mm. Here, sheet 300 may have a thickness less than the minimum thickness requirement for standard LCD equipment, yet have been fabricated using that same equipment.


In an example, as shown in FIGS. 3a-3e, a thick sheet of glass having a thickness of about 0.5 mm could have a protective layer having a similar thickness applied on a surface of the glass to form a combination having a thickness of about 1.0 mm. The glass sheet could be thinned so that the combination has a thickness of about 0.7 mm. Alternatively, the protective layer could concurrently be thinned so that the combination has a thickness of about 0.6 mm. After the protective layer is removed, the glass sheet could have a thickness of about 0.2 mm, which is well below the minimum thickness requirement of standard LCD equipment.


It is to be understood that the thickness of a thin glass sheet is not limited to that described here, but may include any thickness below the minimum thickness requirement of the LCD equipment that may be suitable for touch sensor panels.



FIG. 4 illustrates an exemplary method for fabricating a thin glass sheet according to embodiments of the invention. Optionally using standard LCD technology, a standard LCD thin film deposition tool may be used to place a thin film pattern on a surface of a thick glass sheet (405). The thick glass sheet may have a thickness of 0.5 mm or more to meet the minimum thickness requirement of standard LCD equipment. A standard LCD material deposition tool may be used to apply a protective layer overlaying the patterns on a surface of the thick glass sheet (410). The combined sheet and layer may have a thickness of more than 0.5 mm, which also meets the minimum thickness requirement of standard LCD equipment. A standard LCD thinning tool may be used to thin the surface of the glass sheet opposite the surface having the protective layer, where the thicknesses of the glass sheet may be thinned to less than 0.5 mm (415). Optionally, the protective layer may also be thinned. The combination of the thinned sheet and layer may maintain a thickness of 0.5 mm or more, which still meets the minimum thickness requirement of standard LCD equipment. The standard LCD thin film deposition tool may be used again to coat the thinned outside surface of the sheet (420) to complete the standard LCD fabrication process.


After completing the standard LCD fabrication process, the protective layer may be removed from the surface of the glass sheet. Any suitable removal tool known to those skilled in the art may be used to do so, leaving the thin glass sheet remaining (425). The resulting thin glass sheet may have a thickness of less than 0.5 mm, which is below the minimum thickness requirement of standard LCD equipment, yet still advantageously have been fabricated using that equipment.



FIG. 5a illustrates exemplary digital media player 510 that can include touch sensor panel 515, the touch sensor panel including a thin glass sheet having a thickness of less than 0.5 mm according to embodiments of the invention.



FIG. 5b illustrates exemplary mobile telephone 520 that can include touch sensor panel 525, the touch sensor panel including a thin glass sheet having a thickness of less than 0.5 mm according to embodiments of the invention.


The media player and the mobile telephone of FIGS. 5a and 5b can achieve lighter weights utilizing thin glass sheets according to embodiments of the invention.



FIG. 6 illustrates exemplary computing system 600 that can include one or more of the embodiments of the invention described above. Computing system 600 can include one or more panel processors 602 and peripherals 604, and panel subsystem 606. Peripherals 604 can include, but are not limited to, random access memory (RAM) or other types of memory or storage, watchdog timers and the like. Panel subsystem 606 can include, but is not limited to, one or more sense channels 608, channel scan logic 610 and driver logic 614. Channel scan logic 610 can access RAM 612, autonomously read data from the sense channels and provide control for the sense channels. In addition, channel scan logic 610 can control driver logic 614 to generate stimulation signals 616 at various frequencies and phases that can be selectively applied to drive lines of touch sensor panel 624. In some embodiments, panel subsystem 606, panel processor 602 and peripherals 604 can be integrated into a single application specific integrated circuit (ASIC).


Touch sensor panel 624 can include a capacitive sensing medium having a plurality of drive lines and a plurality of sense lines, although other sensing media can also be used. Either or both of the drive and sense lines can be coupled to a thin glass sheet according to embodiments of the invention. Each intersection of drive and sense lines can represent a capacitive sensing node and can be viewed as picture element (pixel) 626, which can be particularly useful when touch sensor panel 624 is viewed as capturing an “image” of touch. (In other words, after panel subsystem 606 has determined whether a touch event has been detected at each touch sensor in the touch sensor panel, the pattern of touch sensors in the multi-touch panel at which a touch event occurred can be viewed as an “image” of touch (e.g. a pattern of fingers touching the panel).) Each sense line of touch sensor panel 624 can drive sense channel 608 (also referred to herein as an event detection and demodulation circuit) in panel subsystem 606.


Computing system 600 can also include host processor 628 for receiving outputs from panel processor 602 and performing actions based on the outputs that can include, but are not limited to, moving an object such as a cursor or pointer, scrolling or panning, adjusting control settings, opening a file or document, viewing a menu, making a selection, executing instructions, operating a peripheral device coupled to the host device, answering a telephone call, placing a telephone call, terminating a telephone call, changing the volume or audio settings, storing information related to telephone communications such as addresses, frequently dialed numbers, received calls, missed calls, logging onto a computer or a computer network, permitting authorized individuals access to restricted areas of the computer or computer network, loading a user profile associated with a user's preferred arrangement of the computer desktop, permitting access to web content, launching a particular program, encrypting or decoding a message, and/or the like. Host processor 628 can also perform additional functions that may not be related to panel processing, and can be coupled to program storage 632 and display device 630 such as an LCD panel for providing a UI to a user of the device. Display device 630 together with touch sensor panel 624, when located partially or entirely under the touch sensor panel, can form touch screen 618.


Note that one or more of the functions described above can be performed by firmware stored in memory (e.g. one of the peripherals 604 in FIG. 6) and executed by panel processor 602, or stored in program storage 632 and executed by host processor 628. The firmware can also be stored and/or transported within any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. In the context of this document, a “computer-readable medium” can be any medium that can contain or store the program for use by or in connection with the instruction execution system, apparatus, or device. The computer readable medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, a portable computer diskette (magnetic), a random access memory (RAM) (magnetic), a read-only memory (ROM) (magnetic), an erasable programmable read-only memory (EPROM) (magnetic), a portable optical disc such a CD, CD-R, CD-RW, DVD, DVD-R, or DVD-RW, or flash memory such as compact flash cards, secured digital cards, USB memory devices, memory sticks, and the like.


The firmware can also be propagated within any transport medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. In the context of this document, a “transport medium” can be any medium that can communicate, propagate or transport the program for use by or in connection with the instruction execution system, apparatus, or device. The transport readable medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic or infrared wired or wireless propagation medium.


Although the invention has been fully described in connection with embodiments thereof with reference to the accompanying drawings, it is to be noted that various changes and modifications will become apparent to those skilled in the art. Such changes and modifications are to be understood as being included within the scope of the invention as defined by the appended claims.

Claims
  • 1. A method for fabricating a thin sheet of glass comprising: providing a sheet of glass having a first thickness of at least 0.5 mm;applying a patterned thin film on a first major surface of the sheet of glass;applying a protective layer of material having a second thickness over the patterned thin film;thinning the first thickness of the sheet of glass to less than 0.5 mm; andremoving the protective layer of material from the surface of the sheet of glass.
  • 2. The method of claim 1, further comprising: thinning the second thickness of the protective layer of material to less than 0.5 mm.
  • 3. The method of claim 2, wherein the thinning of the first and second thicknesses occur concurrently.
  • 4. The method of claim 1, wherein the protective layer of material comprises a laminate.
  • 5. The method of claim 1, wherein the thinning comprises thinning a second major surface of the sheet of glass opposite the first major surface having the protective layer applied thereon.
  • 6. The method of claim 1, wherein the removing comprising at least one of chemical etching and mechanical polishing.
  • 7. The method of claim 1, wherein the sheet of glass with the patterned thin film is part of a touch sensor panel.
  • 8. The method of claim 1, wherein the sheet of glass with the patterned thin film is part of a display device for a computing device.
  • 9. The method of claim 5, wherein the method further comprises: after the thinning of the second major surface of the sheet of substrate material, applying a thin film layer on the second major surface of the sheet of glass opposite the patterned surface.
  • 10. A method for fabricating a thin sheet of substrate material comprising: providing a sheet of substrate material having a first thickness of at least 0.5 mm;applying a patterned thin film on a first major surface of the sheet of substrate material;applying a protective layer of material having a second thickness over the patterned thin film on the first major surface of the sheet of substrate material; andthinning the first thickness of the sheet of substrate material.
  • 11. The method of claim 10, wherein the thinning comprises thinning the first thickness to less than 0.5 mm.
  • 12. The method of claim 11, further comprising: thinning the second thickness of the protective layer of material to less than 0.5 mm.
  • 13. The method of claim 12, wherein the thinning of the first and second thicknesses occur concurrently.
  • 14. The method of claim 10, wherein the method further comprises: removing the protective layer of material from the surface of the sheet of substrate material.
  • 15. The method of claim 14, wherein the removing comprising at least one of chemical etching and mechanical polishing.
  • 16. The method of claim 14, wherein the protective layer of material comprises a laminate.
  • 17. The method of claim 14, wherein the thinning comprises thinning a second major surface of the sheet of substrate material opposite the first major surface having the protective layer applied thereon.
  • 18. The method of claim 17, wherein the method further comprises: after the thinning of the second major surface of the sheet of substrate material, applying a thin film layer on the second major surface of the sheet of substrate material opposite the patterned surface.
  • 19. The method of claim 10, wherein the substrate material with the patterned thin film is part of a touch sensor panel.
  • 20. The method of claim 10, wherein the substrate material with the patterned thin film is part of a display device for a computing device.
CROSS-REFERENCE TO RELATED APPLICATION

This application is a divisional application of U.S. application Ser. No. 12/163,701, filed Jun. 27, 2008, now U.S. Pat. No. 8,673,163, and entitled “METHOD FOR FABRICATING THIN SHEETS OF GLASS,” which is hereby incorporated herein by reference.

US Referenced Citations (235)
Number Name Date Kind
3415637 Glynn Dec 1968 A
3467508 Loukes et al. Sep 1969 A
3498773 Due et al. Mar 1970 A
3558415 Rieser et al. Jan 1971 A
3607172 Poole et al. Sep 1971 A
3619240 Toussaint et al. Nov 1971 A
3626723 Plumat Dec 1971 A
3652244 Plumat Mar 1972 A
3753840 Plumat Aug 1973 A
3798013 Hasegawa et al. Mar 1974 A
3843472 Toussaint et al. Oct 1974 A
3857689 Koizumi et al. Dec 1974 A
3951707 Kurtz et al. Apr 1976 A
4015045 Rinehart Mar 1977 A
4119760 Rinehart Oct 1978 A
4156755 Rinehart May 1979 A
4165228 Ebata et al. Aug 1979 A
4178082 Ganswein et al. Dec 1979 A
4212919 Hoda Jul 1980 A
4346601 France Aug 1982 A
4353649 Kishii Oct 1982 A
4425810 Simon et al. Jan 1984 A
4646722 Silverstein et al. Mar 1987 A
4733973 Machak et al. Mar 1988 A
4842629 Clemens et al. Jun 1989 A
4844724 Sakai et al. Jul 1989 A
4846868 Aratani Jul 1989 A
4849002 Rapp Jul 1989 A
4872896 LaCourse et al. Oct 1989 A
4911743 Bagby Mar 1990 A
4937129 Yamazaki Jun 1990 A
4957364 Chesler Sep 1990 A
4959548 Kupperman et al. Sep 1990 A
4983197 Froning et al. Jan 1991 A
4986130 Engelhaupt et al. Jan 1991 A
5041173 Shikata et al. Aug 1991 A
5104435 Oikawa et al. Apr 1992 A
5129934 Koss Jul 1992 A
5157746 Tobita et al. Oct 1992 A
5160523 Honkanen et al. Nov 1992 A
5254149 Hashemi et al. Oct 1993 A
5269888 Morasca Dec 1993 A
5281303 Beguin et al. Jan 1994 A
5369267 Johnson et al. Nov 1994 A
5411563 Yeh May 1995 A
5437193 Schleitweiler et al. Aug 1995 A
5445871 Murase et al. Aug 1995 A
5483261 Yasutake Jan 1996 A
5488204 Mead et al. Jan 1996 A
5525138 Hashemi et al. Jun 1996 A
5625154 Matsuhiro et al. Apr 1997 A
5654057 Kitayama Aug 1997 A
5725625 Kitayama et al. Mar 1998 A
5733622 Starcke et al. Mar 1998 A
5766493 Shin Jun 1998 A
5780371 Rifqi et al. Jul 1998 A
5816225 Koch et al. Oct 1998 A
5825352 Bisset et al. Oct 1998 A
5826601 Muraoka et al. Oct 1998 A
5835079 Shieh Nov 1998 A
5880411 Gillespie et al. Mar 1999 A
5930047 Gunz et al. Jul 1999 A
5953094 Matsuoka et al. Sep 1999 A
5985014 Ueda et al. Nov 1999 A
6050870 Suginoya et al. Apr 2000 A
6114039 Rifqi Sep 2000 A
6120908 Papanu et al. Sep 2000 A
6166915 Lake et al. Dec 2000 A
6188391 Seely et al. Feb 2001 B1
6245313 Suzuki et al. Jun 2001 B1
6287674 Verlinden et al. Sep 2001 B1
6307590 Yoshida Oct 2001 B1
6310610 Beaton et al. Oct 2001 B1
6323846 Westerman et al. Nov 2001 B1
6325704 Brown et al. Dec 2001 B1
6327011 Kim Dec 2001 B2
6350664 Haji et al. Feb 2002 B1
6393180 Farries et al. May 2002 B1
6429840 Sekiguchi Aug 2002 B1
6437867 Zeylikovich et al. Aug 2002 B2
6516634 Green et al. Feb 2003 B1
6521862 Brannon Feb 2003 B1
6621542 Aruga Sep 2003 B1
6690387 Zimmerman et al. Feb 2004 B2
6718612 Bajorek Apr 2004 B2
6769274 Cho et al. Aug 2004 B2
6810688 Duisit et al. Nov 2004 B1
6936741 Munnig et al. Aug 2005 B2
6955971 Ghyselen et al. Oct 2005 B2
6996324 Hiraka et al. Feb 2006 B2
7012700 De Groot et al. Mar 2006 B2
7013709 Hajduk et al. Mar 2006 B2
7015894 Morohoshi Mar 2006 B2
7070837 Ross Jul 2006 B2
7166531 van den Hoek et al. Jan 2007 B1
7184064 Zimmerman et al. Feb 2007 B2
7461564 Glaesemann Dec 2008 B2
7558054 Prest et al. Jul 2009 B1
7626807 Hsu Dec 2009 B2
7663607 Hotelling et al. Feb 2010 B2
7810355 Feinstein et al. Oct 2010 B2
7872644 Hong et al. Jan 2011 B2
7918019 Chang et al. Apr 2011 B2
8013834 Kim Sep 2011 B2
8110268 Hegemier et al. Feb 2012 B2
8111248 Lee et al. Feb 2012 B2
8312743 Pun et al. Nov 2012 B2
8393175 Kohli et al. Mar 2013 B2
8551283 Pakula et al. Oct 2013 B2
8673163 Zhong Mar 2014 B2
8684613 Weber et al. Apr 2014 B2
20020035853 Brown et al. Mar 2002 A1
20020155302 Smith et al. Oct 2002 A1
20020157199 Piltingsrud Oct 2002 A1
20030024274 Cho et al. Feb 2003 A1
20030057183 Cho et al. Mar 2003 A1
20030077453 Oaku et al. Apr 2003 A1
20030234771 Mulligan et al. Dec 2003 A1
20040051944 Stark Mar 2004 A1
20040119701 Mulligan et al. Jun 2004 A1
20040137828 Takahashi et al. Jul 2004 A1
20040142118 Takechi Jul 2004 A1
20040163414 Eto et al. Aug 2004 A1
20050058423 Brinkmann et al. Mar 2005 A1
20050105071 Ishii May 2005 A1
20050135724 Helvajian et al. Jun 2005 A1
20050193772 Davidson et al. Sep 2005 A1
20050245165 Harada et al. Nov 2005 A1
20050285991 Yamazaki Dec 2005 A1
20060026521 Hotelling et al. Feb 2006 A1
20060055936 Yun et al. Mar 2006 A1
20060063351 Jain Mar 2006 A1
20060070694 Rehfeld et al. Apr 2006 A1
20060097991 Hotelling et al. May 2006 A1
20060197753 Hotelling et al. Sep 2006 A1
20060227331 Wollmer et al. Oct 2006 A1
20060238695 Miyamoto Oct 2006 A1
20060250559 Bocko et al. Nov 2006 A1
20060268528 Zadesky et al. Nov 2006 A1
20060292822 Xie Dec 2006 A1
20070003796 Isono et al. Jan 2007 A1
20070013822 Kawata et al. Jan 2007 A1
20070029519 Kikuyama et al. Feb 2007 A1
20070030436 Sasabayashi Feb 2007 A1
20070039353 Kamiya Feb 2007 A1
20070046200 Fu et al. Mar 2007 A1
20070063876 Wong Mar 2007 A1
20070089827 Funatsu Apr 2007 A1
20070122542 Halsey et al. May 2007 A1
20070132737 Mulligan et al. Jun 2007 A1
20070196578 Karp et al. Aug 2007 A1
20070236618 Maag et al. Oct 2007 A1
20080026260 Kawai Jan 2008 A1
20080074028 Ozolins et al. Mar 2008 A1
20080094716 Ushiro et al. Apr 2008 A1
20080135175 Higuchi Jun 2008 A1
20080158181 Hamblin et al. Jul 2008 A1
20080202167 Cavallaro et al. Aug 2008 A1
20080243321 Walser et al. Oct 2008 A1
20080261057 Slobodin Oct 2008 A1
20080264176 Bertrand et al. Oct 2008 A1
20080286548 Ellison et al. Nov 2008 A1
20090046240 Bolton Feb 2009 A1
20090067141 Dabov et al. Mar 2009 A1
20090091551 Hotelling et al. Apr 2009 A1
20090096937 Bauer et al. Apr 2009 A1
20090153729 Hiltunen et al. Jun 2009 A1
20090162703 Kawai Jun 2009 A1
20090197048 Amin et al. Aug 2009 A1
20090202808 Glaesemann et al. Aug 2009 A1
20090220761 Dejneka et al. Sep 2009 A1
20090257189 Wang et al. Oct 2009 A1
20090294420 Abramov et al. Dec 2009 A1
20090324899 Feinstein et al. Dec 2009 A1
20090324939 Feinstein et al. Dec 2009 A1
20100009154 Allan et al. Jan 2010 A1
20100028607 Lee et al. Feb 2010 A1
20100035038 Barefoot et al. Feb 2010 A1
20100053632 Alphonse et al. Mar 2010 A1
20100062284 Watanabe et al. Mar 2010 A1
20100119846 Sawada May 2010 A1
20100137031 Griffin et al. Jun 2010 A1
20100154992 Feinstein et al. Jun 2010 A1
20100167059 Hashimoto et al. Jul 2010 A1
20100171920 Nishiyama Jul 2010 A1
20100179044 Sellier et al. Jul 2010 A1
20100206008 Harvey et al. Aug 2010 A1
20100215862 Gomez et al. Aug 2010 A1
20100216514 Smoyer et al. Aug 2010 A1
20100224767 Kawano et al. Sep 2010 A1
20100265188 Chang et al. Oct 2010 A1
20100279067 Sabia et al. Nov 2010 A1
20100285275 Baca et al. Nov 2010 A1
20100296027 Matsuhira et al. Nov 2010 A1
20100315570 Mathew et al. Dec 2010 A1
20100321305 Chang et al. Dec 2010 A1
20110003619 Fujii Jan 2011 A1
20110012873 Prest et al. Jan 2011 A1
20110019123 Prest et al. Jan 2011 A1
20110019354 Prest et al. Jan 2011 A1
20110030209 Chang et al. Feb 2011 A1
20110063550 Gettemy et al. Mar 2011 A1
20110067447 Prest et al. Mar 2011 A1
20110072856 Davidson et al. Mar 2011 A1
20110102346 Orsley et al. May 2011 A1
20110159321 Eda et al. Jun 2011 A1
20110164372 McClure et al. Jul 2011 A1
20110186345 Pakula et al. Aug 2011 A1
20110199687 Sellier et al. Aug 2011 A1
20110248152 Svajda et al. Oct 2011 A1
20110255000 Weber et al. Oct 2011 A1
20110255250 Dinh Oct 2011 A1
20110267833 Verrat-Debailleul et al. Nov 2011 A1
20110279383 Wilson et al. Nov 2011 A1
20110300908 Grespan et al. Dec 2011 A1
20120018323 Johnson et al. Jan 2012 A1
20120027399 Yeates Feb 2012 A1
20120099113 de Boer et al. Apr 2012 A1
20120105400 Mathew et al. May 2012 A1
20120118628 Pakula et al. May 2012 A1
20120135195 Glaesemann et al. May 2012 A1
20120136259 Milner et al. May 2012 A1
20120151760 Steijner Jun 2012 A1
20120188743 Wilson et al. Jul 2012 A1
20120196071 Cornejo et al. Aug 2012 A1
20120202040 Barefoot et al. Aug 2012 A1
20120236477 Weber et al. Sep 2012 A1
20120236526 Weber et al. Sep 2012 A1
20120281381 Sanford Nov 2012 A1
20120328843 Cleary et al. Dec 2012 A1
20130071601 Bibl et al. Mar 2013 A1
20130083506 Wright et al. Apr 2013 A1
20130182259 Brezinski et al. Jul 2013 A1
20130213565 Lee et al. Aug 2013 A1
20140176779 Weber et al. Jun 2014 A1
Foreign Referenced Citations (102)
Number Date Country
283 630 Oct 1970 AT
1277090 Dec 2000 CN
1369449 Sep 2002 CN
1694589 Nov 2005 CN
101025502 Aug 2007 CN
101206314 Jun 2008 CN
101523275 Feb 2009 CN
101465892 Jun 2009 CN
102131357 Jul 2011 CN
101267509 Aug 2011 CN
1322339 Nov 2011 CN
17 71 268 Dec 1971 DE
32 12 612 Oct 1983 DE
103 22 350 Dec 2004 DE
1038663 Sep 2000 EP
1592073 Nov 2005 EP
2025556 Feb 2009 EP
2036867 Mar 2009 EP
2075237 Jul 2009 EP
2196870 Jun 2010 EP
2233447 Sep 2010 EP
2483216 Aug 2012 EP
2635540 Sep 2013 EP
1 346 747 Feb 1974 GB
B S42-011599 Jun 1963 JP
B-S48-006925 Mar 1973 JP
55031944 Mar 1980 JP
55 067529 May 1980 JP
55-95645 Jul 1980 JP
A S55-136979 Oct 1980 JP
55 144450 Nov 1980 JP
A S59-013638 Jan 1984 JP
59037451 Feb 1984 JP
A S61-097147 May 1986 JP
6066696 Oct 1986 JP
63 060129 Mar 1988 JP
63222234 Sep 1988 JP
5-32431 Feb 1993 JP
05249422 Sep 1993 JP
6242260 Sep 1994 JP
A H07-050144 Feb 1995 JP
52031757 Mar 1997 JP
A H09-507206 Jul 1997 JP
09-312245 Dec 1997 JP
2000-163031 Jun 2000 JP
200203895 Jul 2000 JP
A 2001-083887 Mar 2001 JP
A 2002-160932 Jun 2002 JP
2002-342033 Nov 2002 JP
A2003502257 Jan 2003 JP
A2003-146705 May 2003 JP
A 2004-094256 Mar 2004 JP
A2004-259402 Sep 2004 JP
A2004-339019 Dec 2004 JP
2005-162549 Jun 2005 JP
A 2005-156766 Jun 2005 JP
A 2005140901 Jun 2005 JP
2007-099557 Apr 2007 JP
2008-001590 Jan 2008 JP
2008007360 Jan 2008 JP
2008-63166 Mar 2008 JP
2008-066126 Mar 2008 JP
A 2008-195602 Aug 2008 JP
A 2008-216938 Sep 2008 JP
A 2008-306149 Dec 2008 JP
A 2009-234856 Oct 2009 JP
A2009230341 Oct 2009 JP
2010 064943 Mar 2010 JP
A 2010-060908 Mar 2010 JP
A 2010-116276 May 2010 JP
2010195600 Sep 2010 JP
A 2010-237493 Oct 2010 JP
2011-032124 Feb 2011 JP
A 2011-158799 Aug 2011 JP
2011-527661 Nov 2011 JP
A 2013-537723 Oct 2013 JP
2010-2006-005920 Jan 2006 KR
201007521 Feb 2010 TW
201235744 Sep 2012 TW
WO 0047529 Aug 2000 WO
WO 0242838 May 2002 WO
WO 2004014109 Feb 2004 WO
WO 2004-061806 Jul 2004 WO
WO 2004106253 Dec 2004 WO
WO 2007089054 Aug 2007 WO
WO 2008044694 Apr 2008 WO
WO 2008143999 Nov 2008 WO
WO 2009003029 Dec 2008 WO
WO 2009078406 Jun 2009 WO
WO 2009099615 Aug 2009 WO
WO 2009102326 Aug 2009 WO
WO 2009125133 Oct 2009 WO
WO 2010005578 Jan 2010 WO
WO 2010014163 Feb 2010 WO
WO 2010019829 Feb 2010 WO
WO 2010080988 Jul 2010 WO
WO 2010101961 Sep 2010 WO
WO 2011008433 Jan 2011 WO
WO 2011041484 Apr 2011 WO
WO 2012015960 Feb 2012 WO
WO 2012106280 Aug 2012 WO
WO 2013106242 Jul 2013 WO
Non-Patent Literature Citations (21)
Entry
Chemically Strengthened Glass, Wikipedia, Apr. 19, 2009, http://en/wikipedia.org/w/index.php?title=Chemically—strengthened—glass&oldid=284794988.
Wikipedia: “Iphone 4”, www.wikipedia.org, retrieved Oct. 31, 2011, 15 pgs.
“Toward Making Smart Phone Touch-Screens More Glare and Smudge Resistant”, e! Science News, http://eciencenews.com/articles/2009/08/19toward.making.smart.phone.touch.screens.more.glare.and.smudge.resistant, Aug. 19, 2009, 1 pg.
Arun K. Varshneya, Chemical Strengthening of Glass: Lessons Learned and Yet to be Learned International Journal of Applied Glass Science, 2010, 1, 2, pp. 131-142.
Aben “Laboratory of Photoelasticity”, Institute of Cybernetics at TTU, www.ioc.ee/res/photo.html, Oct. 5, 2000.
Forooghian et al., Investigative Ophthalmology & Visual Science; Oct. 2008, vol. 49, No. 10.
“iPhone 4”, Wikipedia, Jan. 4, 2012, 17 pgs.
Mehrl et al., “Designer's Noticebook: Proximity Detection IR LED and Optical Crosstalk”, http://ams.com/eng/content/view/download/145137, Aug. 1, 2011, 5 pages.
Saxer et al., “High-Speed Fiber-Based Polarization-sensitive optical coherence tomography of in vivo human skin”, Optics Letters, vol. 25, No. 18, Sep. 15, 2000, pp. 1355-1357.
Ohkuma, “Development of a Manufacturing Process of a Thin, Lightweight LCD Cell”, Department of Cell Process Development, IBM, Japan, Section 13.4, 2000.
Lee et al., “A Multi-Touch Three Dimensional Touch-Sensitive Tablet”, Proceedings of CHI: ACM Conference on Human Factors in Computing Systems, Apr. 1985, pp. 21-25.
Rubine, “The Automatic Recognition of Gestures”, CMU-CS-91-202, Submitted in Partial Fulfillment of the Requirements of the Degree of Doctor of Philosophy in Computer Science at Carnegie Mellon University, Dec. 1991, 285 pages.
Rubine, “Combining Gestures and Direct Manipulation”, CHI'92, May 1992, pp. 659-660.
Westerman, “Hand Tracking, Finger Identification and Chronic Manipulation of a Multi-Touch Surface”, A Dissertation Submitted to the Faculty of the University of Delaware in Partial Fulfillment of the Requirements for the degree of Doctor of Philosophy in Electrical Engineering, Spring 1999, 364 pages.
International Search Report for PCT Application No. PCT/US2010/020485 mailed Jul. 21, 2010.
Karlsson et al., “The Technology of Chemical Glass Strengthening-a review”, Apr. 2010, Glass Technology, European Journal of Glass Science and Technology A., vol. 51, No. 2, pp. 41-54.
Restriction Requirement for U.S. Appl. No. 12/163,701, mailed Sep. 1, 2010.
Restriction Requirement for U.S. Appl. No. 12/163,701, mailed Nov. 17, 2010.
Office Action for U.S. Appl. No. 12/163,701, mailed Feb. 11, 2011.
Final Office Action for U.S. Appl. No. 12/895,372, mailed Jun. 24, 2011.
Notice of Allowance for U.S. Appl. No. 12/895,372, mailed Oct. 23, 2013.
Related Publications (1)
Number Date Country
20140196933 A1 Jul 2014 US
Divisions (1)
Number Date Country
Parent 12163701 Jun 2008 US
Child 14211396 US