PATENT DOCUMENT

Publication Number: US-11109500-B2
Application Number: US-201916564325-A
Country: US
Kind Code: B2

Title: Textured glass component for an electronic device enclosure

Abstract:
The disclosure provides textured glass components as well as electronic device cover assemblies and enclosures which include the textured glass components. In some cases, a protruding portion of the glass component includes a textured region provided over a camera assembly of the electronic device. One or more openings may be provided in the textured region. The textured region may be configured to provide a translucent or hazy appearance to the electronic device while providing a desirable “feel” to the electronic device and level of cleanability.

Claims:
What is claimed is: 
     
       1. An electronic device comprising: a display; an enclosure at least partially surrounding the display and comprising: a front cover assembly including a front glass member positioned over the display; and a rear cover assembly including a rear glass member defining a protruding portion defining an opening and defining a textured region having a gloss value less than 50 as measured at 60 degrees; and a camera assembly coupled to an interior surface of the rear cover assembly and including a camera module positioned at least partially within the opening. 
     
     
       2. The electronic device of  claim 1 , wherein:
 the enclosure further comprises a housing positioned between the front cover assembly and the rear cover assembly; 
 the housing comprises a pair of metal segments separated by a dielectric segment; 
 the rear glass member further defines a base portion surrounding the protruding portion; and 
 the protruding portion extends outward from the base portion. 
 
     
     
       3. The electronic device of  claim 2 , wherein a ratio of a thickness of the protruding portion to a thickness of the base portion is from 1.5 to 2.5. 
     
     
       4. The electronic device of  claim 2 , wherein the rear glass member includes a compressive stress layer extending from an exterior surface of the base portion and an exterior surface of the protruding portion. 
     
     
       5. The electronic device of  claim 4 , wherein the camera assembly is bonded to the interior surface of the rear cover assembly by an adhesive layer thereby limiting a bending-induced tensile stress along the textured region. 
     
     
       6. The electronic device of  claim 2 , wherein the textured region comprises surface features resulting from mechanical grinding and polishing. 
     
     
       7. The electronic device of  claim 6 , wherein:
 the camera assembly is coupled to an interior surface of the protruding portion; and 
 the protruding portion has a translucent appearance. 
 
     
     
       8. An electronic device comprising: an enclosure including a cover member formed from a glass material and defining: an exterior surface comprising: a raised region defining a first texture comprising surface features having a root mean square height from 0.2 microns to 2 microns; and a base region defining a second texture different than the first texture, the raked region protruding with respect to the base region; and a through-hole extending from the raked region to an interior surface of the cover member; and a camera assembly coupled to the interior surface of the cover member and comprising a camera module positioned at least partially in the through-hole. 
     
     
       9. The electronic device of  claim 8 , wherein:
 the second texture has second surface features having a second root mean square height; 
 the root mean square height of the first texture is a first root mean square height; and 
 the first root mean square height of the first texture is greater than the second root mean square height of the second texture. 
 
     
     
       10. The electronic device of  claim 9 , wherein the second root mean square height of the second texture is from 1 nm to 125 nm. 
     
     
       11. The electronic device of  claim 8 , wherein the surface features of the first texture define a mean peak curvature (SSc) ranging from 0.5 microns− to 2 microns −1 . 
     
     
       12. The electronic device of  claim 8 , wherein:
 the raised region defines a plateau; and 
 the exterior surface further defines a side region extending from the base region to the raised region. 
 
     
     
       13. The electronic device of  claim 8 , wherein an end of the camera module is flush with the raised region. 
     
     
       14. The electronic device of  claim 8 , wherein:
 an exterior compressive stress layer extends into the glass material from the raised region and the base region of the exterior surface; and 
 an interior compressive stress layer extends into the glass material from the interior surface. 
 
     
     
       15. An electronic device comprising: an enclosure including: a front cover assembly comprising a front glass member; and a rear cover assembly comprising: a first glass portion having a first thickness and defining a textured region having a translucent appearance and defining:surface features having: a mean peak curvature (SSc) ranging from 0.5 microns 1  to 2 microns 1  and a root mean square slope (Sdq) from 0.1 to 1; and an opening positioned in the textured region; and a second glass portion at least partially surrounding the first glass portion and having a second thickness less than the first thickness; a camera assembly coupled to an interior surface of the rear cover assembly, the camera assembly comprising a camera module positioned at least partially within the opening; and a display positioned below the front cover assembly. 
     
     
       16. The electronic device of  claim 15 , wherein the surface features define an autocorrelation length from 3 microns to 25 microns. 
     
     
       17. The electronic device of  claim 15 , wherein: the first glass portion has a thickness greater than 1 mm and less than or equal to 2 mm; and the second glass portion has a thickness greater than 0.5 mm and less than 1 mm. 
     
     
       18. The electronic device of  claim 15 , wherein:
 the rear cover assembly further comprises a polymer-based coating disposed along an interior surface of the second glass portion; and 
 an interior surface of the first glass portion is free of the polymer-based coating. 
 
     
     
       19. The electronic device of  claim 18 , wherein the camera assembly includes a support structure and the support structure limits bending of the rear cover assembly. 
     
     
       20. The electronic device of  claim 15 , further comprising a wireless charging assembly coupled to the interior surface of the rear cover assembly.

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a non-provisional patent application of and claims the benefit of U.S. Provisional Patent Application No. 62/857,613, filed Jun. 5, 2019, and titled “Electronic Device Enclosure Having a Textured Glass Component,” the disclosure of which is hereby incorporated by reference herein in its entirety. 
    
    
     FIELD 
     The described embodiments relate generally to electronic device enclosures that include textured glass components. More particularly, the present embodiments relate to textured glass components, cover assemblies, and enclosures for electronic devices. 
     BACKGROUND 
     Enclosures for electronic devices may traditionally be formed from a variety of components. Some traditional enclosures are formed from plastic or metal materials, which may be shaped and textured using a traditional molding or a machining technique. However, it may be more difficult to texture or shape enclosure components formed from a brittle material such as a glass. The techniques and articles described herein are directed to forming a texture and other surface features on a glass component of an enclosure. 
     SUMMARY 
     Textured glass components for electronic devices are disclosed herein. In some cases, a textured glass component such as a glass cover member may have a texture configured to provide a desired appearance to an exterior surface of the electronic device. For example, a glass cover member may have a texture configured to provide a particular gloss level and/or translucence level. The texture may also be configured to provide a particular “feel” to the electronic device, to be readily cleaned, or both. 
     As an example, the textured region of a glass component may be provided over a camera assembly of the electronic device. One or more openings may be provided in the textured region of the glass component to facilitate positioning of an optical module such as a camera module. An opening may also facilitate input or output to elements of the optical module. In some cases, the portion of the glass component including the textured region may be thicker than another portion of the glass component. 
     The disclosure provides an electronic device comprising a display, an enclosure at least partially surrounding the display, and a camera assembly. The enclosure comprises a front cover assembly including a front glass member positioned over the display and a rear cover assembly. The rear cover assembly includes a rear glass member defining a protruding portion. The protruding portion defines an opening and a textured region having gloss value less than about 50 as measured at 60 degrees. The camera assembly is coupled to an interior surface of the rear cover assembly and includes a camera module positioned at least partially within the opening. 
     In addition, the disclosure provides an electronic device comprising an enclosure including a cover member formed from a glass material and a camera assembly coupled to the interior surface of the cover member. The cover member defines an exterior surface comprising a raised region defining a first texture comprising surface features having a root mean square height from about 0.2 microns to about 2 microns and a base region defining a second texture different than the first texture, the raised region protruding with respect to the base region. The cover member further defines a through-hole extending from the raised region to an interior surface of the cover member. The camera assembly comprises a camera module positioned at least partially in the through-hole. 
     Further, the disclosure provides an electronic device comprising an enclosure including a front cover assembly comprising a front glass member, a rear cover assembly comprising a rear glass member, a camera assembly coupled to an interior surface of the rear cover assembly, and a display positioned below the front cover assembly. The rear cover assembly comprises a first glass portion having a first thickness and defining a textured region having a translucent appearance and defining surface features having a mean peak curvature (SSc) ranging from about 0.5 microns −1  to about 2 microns −1  and a root mean square slope (Sdq) from about 0.1 to about 1. The first glass portion further defines an opening positioned in the textured region. The rear cover assembly further comprises a second glass portion at least partially surrounding the first glass portion and having a second thickness less than the first thickness. The camera assembly comprises a camera module positioned at least partially within the opening. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure will be readily understood by the following detailed description in conjunction with the accompanying drawings, wherein like reference numerals designate like elements. 
         FIG. 1A  shows front view of an example electronic device including a textured glass component. 
         FIG. 1B  shows a rear view of the electronic device of  FIG. 1A . 
         FIG. 2A  shows a partial cross-section view of an electronic device. 
         FIG. 2B  shows a detail view of one portion of a cover assembly of an electronic device. 
         FIG. 2C  shows a detail view of another portion of the cover assembly of an electronic device. 
         FIG. 3  shows a partial cross-section view of an electronic device. 
         FIG. 4  shows a partial cross-section view of a textured glass cover member of an electronic device. 
         FIG. 5  shows a detailed cross-section view of a textured region of a glass cover member of an electronic device. 
         FIG. 6  shows a flow chart of an example process for forming a textured glass cover component. 
         FIG. 7  schematically shows a textured glass cover member after chemical strengthening. 
         FIG. 8  schematically shows an additional textured glass cover member after chemical strengthening. 
         FIG. 9  shows a block diagram of a sample electronic device that can incorporate a textured glass component. 
     
    
    
     The use of cross-hatching or shading in the accompanying figures is generally provided to clarify the boundaries between adjacent elements and also to facilitate legibility of the figures. Accordingly, neither the presence nor the absence of cross-hatching or shading conveys or indicates any preference or requirement for particular materials, material properties, element proportions, element dimensions, commonalities of similarly illustrated elements, or any other characteristic, attribute, or property for any element illustrated in the accompanying figures. 
     Additionally, it should be understood that the proportions and dimensions (either relative or absolute) of the various features and elements (and collections and groupings thereof) and the boundaries, separations, and positional relationships presented therebetween, are provided in the accompanying figures merely to facilitate an understanding of the various embodiments described herein and, accordingly, may not necessarily be presented or illustrated to scale, and are not intended to indicate any preference or requirement for an illustrated embodiment to the exclusion of embodiments described with reference thereto. 
     DETAILED DESCRIPTION 
     Reference will now be made in detail to representative embodiments illustrated in the accompanying drawings. It should be understood that the following descriptions are not intended to limit the embodiments to one preferred implementation. To the contrary, the described embodiments are intended to cover alternatives, modifications, and equivalents as can be included within the spirit and scope of the disclosure and as defined by the appended claims. 
     The following disclosure relates to textured glass components for electronic devices. A textured region of a glass component, such as a glass cover member or a glass member, may be configured to provide a desired appearance to an exterior surface of an electronic device. In addition, the texture may be configured to provide a particular “feel” to the electronic device, to be readily cleaned, or both. The textured glass component may be chemically strengthened to enhance its resistance to impact and/or bending. 
     In some embodiments, a glass component may have a texture configured to provide certain properties while minimizing other properties which are less desirable. For example, the texture may be configured to have roughness parameters which provide particular levels of optical properties such as gloss and/or transmissive haze, while avoiding an overly rough or sharp “feel.” The texture may provide a balance of functionality. For example, increasing the value of a roughness parameter to reduce the gloss or increase the haziness of the surface may, in some cases, provide an overly rough “feel” or undesirably reduce the cleanability of the surface. In some cases, different regions of the glass component may have different textures in order to provide different properties to the different regions. 
     The textured region of the glass component, such as a glass cover member or glass member, may produce a semi-gloss or a low gloss effect. For example, the gloss may be less than about 50 gloss units, less than about 40 gloss units, from 5 gloss units to 50 gloss units, from 10 gloss units to 50 gloss units, or from 10 gloss units to 45 gloss units as measured at 60 degrees. 
     The textured region of a glass component may produce a translucent or hazy effect. The transmissive haze may relate to the amount of light subject to wide angle scattering (e.g., greater than 2.5 degrees). Glass components with greater amounts of transmissive haze may have reduced transmissive contrast. The transmissive haze may be greater than or equal to about 50%, greater than or equal to about 60%, greater than or equal to about 70%, from about 60% to about 90%, or from about 70% to about 80%. 
     The textured region of the glass component and of a cover assembly including the glass component may be configured to provide a particular coefficient of friction or otherwise may produce a particular tactile feel to a user when the textured region is touched. For example, the textured region may be configured to have a coefficient of friction, for a finger touching or sliding along the textured region, that is within a specified range, thereby providing a desired tactile feel to the enclosure. A user may touch or slide a finger along the textured region, for example, as a result of normal handling of the electronic device. 
     The textured region of the glass component and of the cover assembly may also be configured so that dirt or debris accumulated from normal handling of the electronic device is readily cleanable or removable. For example, the textured region may be configured so that it does not create and/or trap textile debris. As explained in more detail below, the texture may be configured so that a root mean square (RMS) height of the features, a root mean square (RMS) slope of the surface features is not overly large, and/or the mean peak curvature provides the desired optical and tactile properties. More detailed description of these and other texture parameters is provided with respect to  FIG. 5  and, for brevity, will not be repeated here. 
     The discussion herein with respect to properties of textured glass cover members also relates more generally to textured glass components as described herein. These and other embodiments are discussed below with reference to  FIGS. 1A-9 . However, those skilled in the art will readily appreciate that the detailed description given herein with respect to these figures is for explanatory purposes only and should not be construed as limiting. 
       FIG. 1A  shows a front view of an example electronic device  100  including a textured glass component. The electronic device  100  may be a mobile telephone (also referred to as a mobile phone). In additional embodiments, the electronic device  100  may be a notebook computing device (e.g., a notebook or laptop), a tablet computing device (e.g., a tablet), a portable media player, a wearable device, or another type of portable electronic device. The electronic device  100  may also be a desktop computer system, computer component, input device, appliance, or virtually any other type of electronic product or device component. 
     As shown in  FIG. 1A , the electronic device  100  has an enclosure  110  including a cover assembly  122 . The cover assembly  122  may at least partially define a front surface  102  of the electronic device  100 . In this example the cover assembly  122  defines a substantial entirety of a front surface of the electronic device  100 . The cover assembly  122  is positioned over the display  144  and may define a transparent portion positioned over the display  144 . The enclosure  110  may at least partially surround the display  144 . 
     As shown in  FIG. 1A , the enclosure  110  further includes a housing member  112  (which may also be referred to simply as a housing or a housing component). The cover assembly  122  may be coupled to the housing  112 . For example, the cover assembly  122  may be coupled to the housing  112  with an adhesive, a fastener, an engagement feature, or a combination thereof. 
     The housing  112  may at least partially define a side surface  106  of the electronic device  100  and may include one or more metal members or one or more glass members. In this example, the housing  112  defines all four sides or a continuous side surface of the electronic device  100 . As shown in  FIG. 1A , the housing  112  is formed from a series of metal segments ( 114 ,  116 ) that are separated by polymer or dielectric segments  115  that provide electrical isolation between adjacent metal segments. For example, a polymer segment  115  may be provided between a pair of adjacent metal segments. One or more of the metal segments ( 114 ,  116 ) may be coupled to internal circuitry of the electronic device  100  and may function as an antenna for sending and receiving wireless communication. 
     The housing  112  may define one or more openings or ports. As shown in  FIG. 1A , the metal segment  116  of the housing  112  defines an opening  117 . The opening  117  may allow (audio) input or output from a device component such as a microphone or speaker or may contain an electrical port or connection. 
     A cover assembly such as the cover assembly  122  typically includes a glass cover member  132 , also referred to herein as a glass member. As shown in  FIG. 1A , the cover assembly  122  is a front cover assembly and the glass member  132  is a front glass member. Examples of glass cover members are shown in  FIGS. 2A-5 and 7-8  and the description provided with respect to these figures is generally applicable herein. In some embodiments a cover assembly may be described as a glass cover. More generally, a cover assembly may be formed from multiple layers. For example, a multilayer cover assembly may include one or more glass sheets, polymer sheets, and/or various coatings and layers. In some cases, a glass cover member may extend laterally across the cover assembly, such as substantially across the width and the length of the cover assembly. In additional cases, a cover assembly may include multiple cover glass members that together substantially extend laterally across the cover assembly. 
     Typical cover assemblies herein are thin, and typically have a glass cover member that is less than 5 mm in thickness, and more typically less than 3 mm in thickness. In some aspects, a glass cover member of a cover assembly, such as glass cover members  132  and  134 , can have a thickness from about 0.1 mm to 2 mm, from 0.5 mm to 2 mm, or from 0.2 mm to 1 mm. As described herein, the glass cover members may have a non-uniform thickness. 
     Although the cover assembly  122  is shown in  FIG. 1A  as being substantially planar, the principles described herein also relate to cover assemblies and glass components which define a surface protrusion (such as shown in  FIG. 1B ), a surface recess, and/or one or more curved surfaces. In embodiments, a glass component such as a glass cover member may be three-dimensional or define a contoured profile. For example, the glass component may define a peripheral portion that is not coplanar with respect to a central portion. The peripheral portion may, for example, define a side wall of a device housing or enclosure, while the central portion defines a front surface (which may define a transparent window that overlies a display). 
     In additional embodiments, cover assemblies as described herein may be included in an all glass or a multi-faceted glass enclosure. In such embodiments, a cover assembly may define one or more surfaces of the enclosure, such as a front surface and a side surface, or a front surface, a side surface and a rear surface. A cover assembly for such an enclosure may include a glass component, a glass cover member, or a combination thereof. 
       FIG. 1B  shows a rear view of the electronic device  100 . As shown in  FIG. 1B , the enclosure  110  includes a cover assembly  124 , which defines a rear surface  104  of the electronic device. In the example of  FIG. 1B , the cover assembly  124  defines a substantial entirety of the rear surface of the electronic device. The cover assembly  124  includes a glass cover member  134 . As shown in  FIG. 1B , the cover assembly  124  is a rear cover assembly and the glass cover member  134  is a rear glass member. In some cases, the electronic device  100  includes a camera assembly coupled to an interior surface of the cover assembly  124  (as shown in  FIGS. 2A and 3 ). 
     As shown in  FIG. 1B , the cover assembly  124  defines a first portion  126  which protrudes or is offset with respect to a second portion  128  of the cover assembly  124 . The first portion  126  may also be referred to herein as a protruding portion and the second portion  128  may also be referred to herein as a base portion. The second portion  128  may at least partially surround the first portion  126 . The first portion  126  may have a thickness greater than the second portion  128 . For example, the first portion  126  may be at least 10%, 25%, or 50% and up to about 250% thicker than the second portion  128 . In some cases, the first portion  126  may have a thickness greater than about 1 mm and less than or equal to about 2 mm and the second portion may have a thickness greater than about 0.5 mm and less than about 1 mm. The amount of protrusion or offset between a raised exterior surface of the first portion  126  and an exterior surface of the second portion  128  may be from about 0.5 mm to about 1.5 mm. The size of the first portion  126  may depend at least in part on the size of the camera assembly. In some embodiments, a lateral dimension (e.g., a width) of the protruding portion may be from about 5 mm to about 30 mm or from about 10 mm to about 20 mm. 
     The cover assembly  124  shown in  FIG. 1B  further defines a third region  127 . In some cases, the third region  127  may define an exterior surface which extends between a raised exterior surface of the first portion  126  and the exterior surface of the second portion  128 . The third region  127  may also be referred to herein as a side region.  FIG. 2A  provides additional description of exterior surface regions of a cover assembly. The description provided with respect to  FIG. 2A  is generally applicable herein and, for brevity, is not repeated here. 
     As shown in  FIG. 1B , the first portion  126  defines a textured region  156  of the electronic device  100 . The textured region  156  may have a texture configured to provide a desired appearance to an exterior surface of the electronic device  100 . In addition, the texture of the textured region  156  may be configured to provide a particular “feel” to the electronic device, to be readily cleaned or both. The textured region  156  typically has at least one roughness parameter greater than that of a polished surface, such as a conventionally polished surface. In some cases, the textured region  156  may extend over a raised exterior surface of the first portion  126 , but may not substantially extend over the third region  127 . 
     The texture of the textured region  156  may be similar or different to that of another portion of the cover assembly. For example, the second portion  128  may have a texture which is smoother than that of the textured region  156  of the first portion  126 . In some cases, the second portion  128  may have a texture similar to that of a polished surface. In addition, the third region  127  may have a texture which is smoother than that of the textured region  156 . In some cases, the third portion  127  may have a texture similar to that of a polished surface. 
     Typically, the electronic device  100  includes a camera assembly which includes one or more optical modules  157 . The example of  FIG. 1B  shows three optical modules  157 , but more generally the camera assembly may define any number of optical modules  157 , such as one, two, three, four, or five optical modules. Each of the optical modules  157  may be substantially flush with, proud of, or recessed with respect to the textured region  156 . 
     The optical modules  157  may include, but are not limited to, a camera module, an illumination module, a sensor, and combinations thereof. In some cases, a camera module includes an optical sensing array and/or an optical component such as a lens, filter, or window. In additional cases, a camera module includes an optical sensing array, an optical component, and a camera module housing surrounding the optical sensing array and the optical components. The camera module may also include a focusing assembly. For example, a focusing assembly may include an actuator for moving a lens of the camera module. In some cases, the optical sensing array may be a complementary metal-oxide semiconductor (CMOS) array or the like. 
     The first portion  126  of the cover assembly  124  may define at least one hole (also referred to herein as a through-hole) which extends through the cover assembly from the textured region  156  to an interior surface of the cover assembly. Therefore, the first portion  126  of the cover assembly may also define at least one opening in the exterior surface  104  with the opening corresponding to the entrance to (or exit from) the through-hole. The opening in the exterior surface  104  may be located in the textured region  156 . As examples, the through-hole or opening may have a lateral dimension (e.g., a width or diameter) from about 1 mm to about 10 mm. A lateral dimension of a textured region between edges of adjacent openings may be from about 1 mm to about 15 mm or from about 1 mm to about 10 mm. 
     In some cases, the first portion  126  may define an arrangement, array, or set of through-holes extending through the first portion  126  (as shown in the partial cross-section views of  FIG. 2A ). The first portion  126  may further define an arrangement, array, or set of openings in the exterior surface of the cover assembly  124 . 
     An optical module  157  may be positioned at least partially within an opening in the textured region  156 , as shown in  FIG. 1B . The optical module  157  may also be positioned at least partially within a through-hole in the first portion  126  (as shown in the partial cross-section view of  FIGS. 2A and 3 ). The camera assembly may be coupled to an interior surface of the cover assembly as shown in  FIGS. 2A and 3 . 
     As previously noted, the cover assembly  124  includes a glass cover member  134 . In some cases, the shape of the glass cover member  134  may generally correspond to the shape of the cover assembly and may extend across a substantial entirely of the rear surface of the electronic device. In additional cases, the cover assembly may include multiple glass cover members. For example, a first glass cover member may define the first portion of the cover assembly and a second glass cover member may define the second portion of the cover assembly. The first glass cover member and the second glass cover member may be coupled together by a fastener or other attachment part alone or in combination with an adhesive. The fastener or other attachment part may at least partially define a third region of the cover assembly. The cover assembly  124  may further include a smudge-resistant coating, a cosmetic coating, or a combination thereof (as shown, for example, in  FIGS. 2B-2C ). 
     The texture of the textured region  156  may result from texturing of the glass cover member  134 . In some cases, the glass cover member  134  may have multiple textured regions. Each of the various textured regions of the glass cover member  134  may have similar textures to each other or may have different textures from each other. Different textures may result from using different process conditions in a single type of texturing process or may result from using different types of texturing processes. In some embodiments, a textured region of the glass cover member  134  may have a texture formed by overlap of two different textures. Such a texture may result from using two different texturing processes to create the textured region. Different methods for forming textures on the glass cover member  134  are discussed with respect to  FIG. 6  and those details are generally applicable herein. Further, the discussion of surface textures provided with respect to  FIG. 5  is generally applicable herein. 
     In addition to a display and a camera assembly, the electronic device  100  may include additional components. These additional components may comprise one or more of a processing unit, control circuitry, memory, an input/output device, a power source (e.g., battery), a charging assembly (e.g., a wireless charging assembly), a network communication interface, an accessory, and a sensor. Components of a sample electronic device are discussed in more detail below with respect to  FIG. 9 . and the description provided with respect to  FIG. 9  is generally applicable herein. 
       FIG. 2A  shows a partial cross-section view of an electronic device  200 . The electronic device  200  may be similar to the electronic device  100  of  FIGS. 1A and 1B  and the cross-section may be taken along A-A. The electronic device  200  includes a cover assembly  222  at the front and a cover assembly  224  at the rear of the electronic device  200 . Each of the cover assembly  222  and the cover assembly  224  is coupled to a housing component  212 , such as with an adhesive, a fastener, or a combination thereof. The housing component  212  may be similar to the housing components  112 ,  114 , and  116  of  FIG. 1 . The housing component  212  at least partially defines an interior cavity  205  of the electronic device  200 . 
     The cover assembly  222  includes a glass cover member  232  and the cover assembly  224  includes a glass cover member  234 . A glass cover member, such as glass cover members  232  and  234 , may be formed from a glass material. The cover assembly  224  defines a protruding portion  226  (also referred to as a first portion) which protrudes with respect to a base portion  228  (also referred to as a second portion) due to the greater thickness of the glass cover member  234  in the protruding portion. Typically at least part of the base portion  228  is substantially adjacent the protruding portion  226 . 
     As shown in  FIG. 2A , the cover assembly  224  further defines an exterior surface  244 . A region  246  of the exterior surface  244  is defined by the protruding portion  226  and a region  248  of the exterior surface  244  is defined by the base portion  228 . The region  246  protrudes or is raised with respect to the second portion  248  and may therefore be referred to as a raised region, an offset region, or an outer region. As an example, the raised region  246  may define a plateau. The region  248  may be referred to herein as a base region. A region  247  of the exterior surface  244  may extend between the region  246  and the region  248  and may define a side of the protruding portion  226 . As schematically shown in  FIG. 2A , the region  246  may include a textured region. In the example of  FIG. 2A , the region  246  has a rougher texture than the region  248  or the region  247 , as shown in more detail in  FIGS. 2B and 2C . 
     The electronic device  200  further includes a display  274  and a touch sensor  272  provided below the front cover assembly  222 . The display  274  and the touch sensor  272  may be coupled to the front cover assembly  222 . The display  274  may be a liquid-crystal display (LCD), a light-emitting diode (LED) display, an LED-backlit LCD display, an organic light-emitting diode (OLED) display, an active layer organic light-emitting diode (AMOLED) display, and the like. The touch sensor  272  may be configured to detect or measure a location of a touch along the exterior surface of the front cover assembly  222 . 
     The cover assembly  224  further includes a cosmetic or decorative coating  260  disposed along an interior surface  233  of the glass cover member  234 , as shown in  FIGS. 2A and 2C . When the cover assembly and glass cover member over the cosmetic coating is textured, the appearance of the electronic device may be due to the combined effect of the textured region and the cosmetic coating. As shown in  FIG. 2A , the cosmetic coating  260  is positioned underneath the base portion  228  of the cover assembly  224  and in some cases may provide the base portion  228  with a desired color. In additional cases, the cosmetic coating  260  may function as a masking layer. In the example of  FIG. 2A , the cosmetic coating does not substantially extend under the protruding portion  226  and the protruding portion  226  may have a different color than the base portion  228 . In some cases, the protruding portion  226  (or the corresponding protruding portion of the glass cover member) may appear to be substantially colorless. For example, the absolute value of each of a* and b* may be less than 5, less than 3, or less than or equal to 2 and the value of L* may be greater than 90, greater than 95, or greater than 98. 
     The electronic device  200  further includes a camera assembly  275 . The partial cross-section view of  FIG. 2A  shows two optical modules ( 277 ,  278 ) of the camera assembly  275 . As shown in  FIG. 2A , the camera assembly  275  is coupled to an interior surface  233  of the glass cover member  234 , although in additional examples the camera assembly may be coupled to another interior surface of the cover assembly  224  (as shown in  FIG. 3 ). For example, the camera assembly  275  may be coupled to the interior surface of the cover assembly  224  with an adhesive bond, as may be provided by an adhesive layer. As an additional example, the camera assembly  275  may be coupled to the interior surface of the cover assembly  224  with a fastener or other form of mechanical attachment. 
     The camera assembly  275  further includes a support structure  276  which is coupled to an interior surface  233  of the glass cover member  234  of the cover assembly  224 . The support structure  276  may be configured to hold various elements of the camera assembly  275  in place. For example each of the optical modules  277  and  278  and a printed circuit board (PCB)  279  may be mounted to the support structure  276 . The shape of the support structure  276  is not limited to the example of  FIG. 2A . In some cases, the support structure  276  may include a plate, a bracket, or a combination thereof. 
     The support structure  276  and the coupling between the camera assembly  275  and the interior surface of the cover assembly  224  may be configured to limit bending of the glass cover member  234  in the vicinity of the protruding portion  226 . For example, the support structure  276  may be configured to limit bending which would tend to increase outwards curvature of the region  246  of the protruding portion  226  (and increase its convexity). Limiting bending of the protruding region can limit bending-induced tensile stress along the textured region  256 . Further, the coupling between the camera assembly  275  and the interior surface of the cover assembly  224  may be sufficiently rigid so that the position of a neutral axis of the combination of the cover assembly  224  and the camera assembly  275  is shifted as compared to the corresponding neutral axis of the cover assembly  224  alone. For example, the neutral axis of the combination of the cover assembly  224  and the camera assembly  275  may be shifted inward, away from the exterior surface  244 , as compared to the corresponding neutral axis of the cover assembly  224  alone. In some cases, the shifting of the neutral axis may be most pronounced in the protruding portion  226  of the cover assembly  224 . 
     As previously described with respect to  FIG. 1B , the cover assembly  224  may define holes  237  and  238  extending through the protruding portion  226 . Holes  237  and  238  may also be referred to herein as through-holes. As shown in  FIG. 2A , the glass cover member  234  also at least partially defines the holes  237  and  238 . The cover assembly  224  further defines openings  267  and  268  to the holes  237  and  238 . The openings  267  and  268  are located in the region  246 , which may be a textured region. 
     The first optical module  277  and the second optical module  278  are respectively aligned with the through-holes  237  and  238 . As shown in  FIG. 2A , the first optical module  277  extends substantially through the first through-hole  237  and the second optical module  278  extends at least partially through the second through-hole  238 . In the example of  FIG. 2A , the optical module  277  may extend through the opening  267  so that an end of the optical module  277  extends beyond (is proud of) the opening  267  and the surface region  246 . The end of the optical module  278  is recessed with respect to the opening  268 . In other examples, an end of an optical module may be flush with an opening, as shown in  FIG. 3 . 
     As previously described with respect to  FIG. 1B , an optical module may comprise a camera module, an illumination module, an optical sensor or the like. Typically the camera assembly  275  includes at least one camera module and may include two, three, four or five camera modules. The camera module is electrically connected to the PCB  279 . 
     In some cases, a window may be positioned within an opening. As shown in  FIG. 2A , a window  269  is positioned within the second opening  268 . The first optical module  277  may also include a window as part of its optical components, with the window being positioned within its housing. 
       FIG. 2B  is a detail view showing the protruding portion  226  (detail  1 - 1 ) and  FIG. 2C  is a detail view showing the base portion  228  (detail  2 - 2 ) of the cover assembly  224 . The scale of  FIGS. 2B and 2C  is exaggerated in order to better illustrate details of the cover assembly  224 . As schematically shown in  FIGS. 2A-2C , the region  246  may define a first texture and the region  248  may define a second texture which is different than the first texture. In the example of  FIGS. 2A   2 C, the region  246  has a rougher texture than the region  248 . In addition, the region  246  has a rougher texture than the region  247 . For example, the region  246  may have at least one roughness parameter, such as a root mean square surface height, a root mean square slope, and/or a mean peak curvature, which is greater than that of the region  248  and/or the region  247 . More generally, the different regions of the exterior surface  244  may have similar textures to each other or may have different textures from each other as previously described with respect to  FIG. 1B . 
     In some cases, the first texture of the protruding portion  226  and the second texture of the base portion  228  may be configured to provide somewhat different optical effects. For example, when the decorative coating  260  provides a desired color to the base portion  228  and the protruding portion  226  has a substantially colorless appearance, the first texture of the protruding portion  226  may be configured to provide a greater amount of translucency than the second texture of the base portion  228 . In some cases, the second texture of the base portion  228  may be substantially transparent and may correspond to the texture of a polished surface. As an additional example, the first texture of the protruding portion may be configured to provide a lower gloss than the window  269 , but may provide a higher gloss than the second texture of the base portion  228 . 
     In addition, the first texture of the protruding portion  226  and the second texture of the base portion  228  may be configured to provide somewhat different tactile effects. For example, the second texture of the base portion  228  may be configured to provide a smoother feel to a user than the first texture of the protruding portion. 
     The texture of a given region of the cover assembly  224  may result, at least in part, from texturing of the glass cover member  234 . Surface features (e.g., surface features  286  and  288 ) formed on the glass cover member  234  and the exterior coating  265  together may define surface structures on the cover assembly (e.g., surface structures  296  and  298 ). Different textures of the glass cover member  234  may result from using different process conditions in a single type of texturing process or may result from using different types of texturing processes. Different methods for forming textures on the glass cover member  234  are discussed with respect to  FIG. 6  and those details are applicable here. Further, the discussion of surface textures and surface features provided with respect to  FIG. 5  is applicable herein but, for brevity, is not repeated here. 
     In some cases, the cosmetic coating  260  comprises a polymer. The cosmetic coating  260  may comprise at least 40%, 50%, 60%, or 70% of the polymer and may therefore be referred to as a polymer-based coating or a polymeric coating. When the coating  260  further comprises a colorant, the polymer may act as a binder for the colorant. The colorant (e.g., a pigment) may be substantially dispersed in a matrix of the polymer. As examples, the polymer may be polyester-based, epoxy-based, urethane-based, or based on another suitable type of polymer or copolymer. The cosmetic coating  260  may further comprise optional additives such as one or more extenders, diluents, polymerization initiators, and/or stabilizers. In some embodiments, the polymer has a cross-linked structure. 
     In some cases, the cosmetic coating may include a color layer (e.g., an ink, dye, paint, etc.) and/or a metal layer. As previously described, the cosmetic coating  260  may include at least one color layer. The color layer may comprise a polymer and a colorant dispersed in the polymer and may be transparent, translucent, or opaque. More generally, any pigment, paint, ink, dye, sheet, film, or other layer may be used as the cosmetic coating  260  or a portion thereof. In some embodiments, the cosmetic coating  260  is a multilayer coating that includes a first color layer and a second color layer. Each of the color layers may be transparent, translucent, or opaque. Each of the color layers may include the same colorant or different color layers may include different colorants. The thickness of each of the color layers in the cosmetic coating  260  may be from about 2 microns to about 10 microns. 
     The color layer(s) and the cosmetic coating  260  may have a chromatic color or an achromatic color. The color of the cosmetic coating  260  may be characterized using a color model. For example, in the hue-saturation-value (HSV) color model, the hue relates to the wavelength(s) of visible light observed when the color feature is viewed (e.g., blue or magenta) and the value relates to the lightness or darkness of a color. The saturation relates to the perceived colorfulness as judged in proportion to its brightness. As another example, coordinates in CIEL*a*b* (CIELAB) color space may be used to characterize the color, wherein L* represents brightness, a* the position between red/magenta and green, and b* the position between yellow and blue. 
     In some cases, the cosmetic coating  260  as viewed through given region of the cover assembly  224  may have a uniform appearance. For example, the cosmetic coating  260  may appear uniform to the unaided eye (also referred to as being visually uniform). The cosmetic coating  260  may have a color variation less than a specified value. For example, an image of the coating as viewed through the glass cover member may be obtained using a digital camera and the color of each pixel of the image may be determined, thereby allowing determination of the color and/or lightness variation. The color uniformity over the textured region may be assessed by assessing the uniformity of the color values obtained using a given color model. For example, the variation in L*, a*, b*, or a combination thereof may be less than about 20%, 15%, 10%, or 5% as measured through a textured region, such as region  248 . 
     In some cases a reference value of the color uniformity may be measured for the cosmetic coating  260  and a perceived color uniformity value of the cosmetic coating  260  as viewed through the textured region  230  may be compared to the reference value. For example, the reference value of the color uniformity may be a first color uniformity value and the perceived color uniformity value of the cosmetic coating  260  as viewed through region of the cover assembly  224  may be a second color uniformity value. In some cases, the second color uniformity value may be the same or substantially the same as the first color uniformity value. For example, the difference between the second color uniformity value and the first color uniformity value may be visually imperceptible. In additional examples, the variation between the second color uniformity value and the first color uniformity value may be less than about 20%, 15%, 10%, or 5%. As previously discussed, a color uniformity value may be determined from the variation in L*, a*, b*, or a combination thereof or by other color measurement techniques. 
     For example, a reference value of the color uniformity may be obtained for the cosmetic coating  260  as applied to a glass cover member who lacks a textured surface as described herein. Instead, the glass cover member used to obtain the reference value may have an as-manufactured surface or a polished surface. The as-manufactured surface or polished surface may have an RMS surface height less than that of a textured surface as described herein. 
     In some cases, the cosmetic coating  260  may include multiple layers, such as a first layer  262  and a second layer  264  as schematically shown in  FIG. 2C . As examples, the cosmetic coating  260  may include an additional color layer, a metal layer, an optically clear layer, an optically dense layer, and combinations thereof. In additional cases, the cosmetic coating need not include a color layer, but may include one or more of an optically dense layer and a metal layer. 
     For example, the cosmetic coating  260  may include an optically dense layer The optically dense layer may substantially reduce or prevent transmission of visible light, thereby “blocking” the view through the cover assembly  224  of components positioned behind the optically dense layer. In addition, the optical properties of the optically dense layer may be configured to adjust the lightness and/or the chroma of the cosmetic coating  260 . 
     For example, the optical density of the optically dense layer may be described by OD=log 10  (initial intensity/transmitted intensity) and may be greater than or equal to 1, greater than or equal to 2, or greater than or equal to 3. Generally, the optically dense layer (e.g., layer  264 ) comprises a polymer. The optically dense layer may further comprise one or more pigments, dyes, or a combination thereof. As an example, the optically dense layer has a substantially wavelength independent (neutral) reflectance and/or absorption spectrum over the visible range. In addition, the optically dense layer may have an achromatic characteristic color. The thickness of the optically dense layer may be from about 2 microns to about 10 microns. 
     In further embodiments, the cosmetic coating  260  may comprise a metal layer in addition to one or more color layers. Such a metal layer may give a metallic effect to the cosmetic coating as seen through the cover assembly  224 . When used to form a metallic marking, the metal layer may be a partial layer (e.g., having a smaller lateral dimension than a color layer). For example, the metal of the layer may be selected from aluminum, copper, nickel, silver, gold, platinum, and alloys thereof. In some cases, the metal layer may be configured to at least partially transmit visible light. For example, the metal layer may have a thickness greater than about 0.5 nm and less than 10 nm, less than 5 nm, less than 3 nm, less than 2 nm, or less than 1 nm. Thicker metal layers may be used for forming an indicium or another marking under the glass cover member. The marking may be in the form of an image, a pattern, text, a glyph, a symbol, indicia, a geometric shape, or a combination thereof. 
     The metal layer may be disposed along an interior surface of the glass cover member  234 . In some cases the metal layer may be used in combination with an optically clear layer. The optically clear layer may have one or more mechanical properties (e.g., modulus, hardness and/or toughness) which limit or prevent propagation of cracks from the metal layer into the glass cover member  234 . The optically clear layer may be a polymeric layer and may have a thickness from about 1 micron to about 5 microns. The optically clear layer may be disposed along the interior surface  233  of the glass cover member  234 , the metal layer may be positioned between the optically clear layer and the optically dense layer, a first color layer may be positioned between the metal layer and the optically dense layer, and a second color layer may be positioned between the first color layer and the optically dense layer. 
     In addition, the cosmetic coating may comprise additional polymeric layers behind and disposed along the optically dense layer. If components of the electronic device are glued to the cosmetic coating, these additional layers may include a protective layer which protects the color layers of the multilayer coating from damage due to the glue. The additional layers may further include a layer inwards of the protective layer which facilitates adhesion of the cosmetic coating to the glue. 
     In addition, the detail views of  FIGS. 2B and 2C  show that regions of the exterior surface  244 , such as regions  246  and  248 , may be defined by an exterior coating  265  applied to the glass cover member  234 . The exterior coating  265  may provide resistance to oils and other deposits on the electronic device and may be referred to as a smudge-resistant coating or as an oleophobic coating. The exterior coating  265  may comprise a fluorinated material, such as a fluorinated oligomer or polymer, to impart oleophobic and/or hydrophobic properties. In embodiments, the layer of the fluorinated material is from about 5 nm to about 20 nm thick or from about 10 nm to about 50 nm thick. The layer of the fluorinated material may be bonded directly to the surface features or may be bonded to an intermediate adhesion layer. 
       FIG. 3  shows a partial cross-section view of an electronic device  300 . The electronic device  300  may be similar to the electronic device  100  of  FIGS. 1A and 1B . The electronic device  300  includes a cover assembly  322  at the front and a cover assembly  324  at the rear of the electronic device  300 . Each of the cover assembly  322  and the cover assembly  324  is coupled to a housing component  312 , such as with an adhesive, a fastener, or a combination thereof. The housing component  312  may be similar to the housing components  112 ,  114  and  116  of  FIG. 1 . The housing component  312  at least partially defines an interior cavity  305  of the electronic device  300 . 
     The cover assembly  322  includes a glass cover member  332  and the cover assembly  324  includes a glass cover member  334 . The cover assembly  324  defines a protruding portion  326  (also referred to as a first portion) which protrudes with respect to a base portion  328  (also referred to as a second portion) due to the greater thickness of the glass cover member  334  in the protruding portion  326 . 
     In a similar fashion as described for  FIG. 2A , the cover assembly  324  defines an exterior surface  344 . A region  346  of the exterior surface  344  is defined by the protruding portion  326  and a region  348  of the exterior surface  344  is defined by the base portion  328 . The region  346  protrudes or is raised with respect to the second portion  348  and may therefore be referred to as a raised region, an offset region, or an outer region. As an example, the raised region  346  may define a plateau. A region  347  of the exterior surface  344  may extend between the region  346  and the region  348  and may define a side of the protruding portion  326 . As schematically shown in  FIG. 3 , the region  346  may include a textured region. In the example of  FIG. 3 , the region  346  has a rougher texture than the region  348  or the region  347 . More generally, the different regions of the exterior surface  344  may have similar textures to each other or may have different textures from each other as previously described with respect to  FIG. 1B . 
     The electronic device  300  further includes a display  374  and a touch sensor  372  provided below the front cover assembly  322 . The display  374  and the touch sensor  372  may be as previously described for  FIG. 2A  and, for brevity, that description is not repeated here. 
     The cover assembly  324  further includes a cosmetic or decorative coating  360  disposed along an interior surface  332  of the glass cover member  334 . The cosmetic coating  360  may directly contact the interior surface  332 . In the example of  FIG. 3 , the cosmetic coating  360  extends under the protruding portion  326 . In some cases, the protruding portion  326  has substantially the same color as the base portion  328 . 
     The electronic device  300  further includes a camera assembly  375 . The partial cross-section view of  FIG. 3  shows one optical module  377  of the camera assembly  375 . The camera assembly  375  further includes a support structure  376  which is coupled to an interior of the cover assembly  324 . As shown in  FIG. 3 , the decorative coating  360  extends between the support structure  376  and the glass cover member  334  and the support structure  376  may be coupled to the interior surface  332  through the cosmetic coating in a similar manner as previously described for support structure  276 . The support structure  376  may have similar features and functions as support structure  276 . The description provided with respect to support structure  276  is generally applicable herein and, for brevity, is not repeated here. 
     As previously described with respect to  FIG. 2A , the cover assembly  324  may define a hole  337  extending through the protruding portion  326 . The hole  337  may also be referred to herein as a through-hole. As shown in  FIG. 3 , the glass cover member  334  also at least partially defines the hole  337 . The cover assembly  324  further defines an opening  367  to the hole  337 . The opening  367  is located in the region  346  includes a textured region. 
     The optical module  377  is aligned with the through-hole  337 . As shown in  FIG. 3 , the optical module  377  extends substantially through the through-hole  337 . The optical module  377  is also positioned at least partially within the opening  367 . In the example of  FIG. 3 , an end of the optical module  377  is substantially flush with the opening  367 . In another example, the optical module  377  may extend through the opening  367  so that an end of the optical module extends beyond (is proud of) the opening and the surface region  346 . 
     In a similar fashion as previously described with respect to  FIGS. 1B and 2A , the different regions of the exterior surface  344  may have similar textures to each other or may have different textures from each other. The texture of a given region of the cover assembly  324  may result from texturing of the glass cover member  334 . Different textures of the glass cover member  334  may result from using different process conditions in a single type of texturing process or may result from using different types of texturing processes. Different methods for forming textures on the glass cover member  334  are discussed with respect to  FIG. 6  and those details are applicable here. Further, the discussion of surface textures provided with respect to  FIG. 5  is applicable herein but, for brevity, is not repeated here. 
     In some cases, the cosmetic coating  360  may include a color layer (e.g., an ink, dye, paint, etc.) and/or a metal layer. The cosmetic coating is positioned underneath the base portion  328  of the cover assembly  324  and may therefore provide the base portion  328  with a desired color. The cosmetic coating may have similar feature to the cosmetic coating  260  and, for brevity, that description is not repeated here. 
       FIG. 4  shows a partial cross-section view of a glass cover member  434  of an electronic device. The glass cover member  434  is shown in  FIG. 4  with the exterior surface  444  of the glass cover member  434  facing upwards, which is rotated with respect to the view of  FIGS. 2A-2C and 3 . The glass cover member  434  may be an example of the glass cover member  134  of  FIG. 1B . As shown in  FIG. 4 , the glass cover member  434  defines a base portion  438  and protruding portion  436  (also referred to as a protrusion), which protrudes or is at least partially offset with respect to the base portion  438 . The thickness T 2  of the protruding portion is greater than the thickness T 1  of the base portion  438 . As examples, the ratio T 2 /T 1  may be from about 1.25 to about 3 or from about 1.5 to about 2. In some cases, the protruding portion  436  has a thickness greater than about 1 mm and less than or equal to about 2 mm and the base portion  438  has a thickness greater than about 0.5 mm and less than about 1 mm. 
     As shown in  FIG. 4 , the exterior surface  444  of the glass cover member  434  includes a base portion  448  defined by the base portion  438  of the glass cover member  434 . The exterior surface  444  further includes a raised region  446  and a side region  447  defined by the protruding portion  436 . The raised region  446  may also be referred to as an offset region, as an outer region, or as a central region (of the protruding portion  436 ). The raised region  446  is offset with respect to the base region  448  of the exterior surface  444 . In particular, the raised region  446  protrudes outwards, away from the interior cavity of the electronic device. The raised region  446  may define a plateau. 
     As shown in  FIG. 4 , the protruding portion  436  of the glass cover member  434  may further define a through-hole, such as the through-hole  435 . The through-hole  435  may allow input to, output from, or placement of a device component such as an optical module as previously described with respect to  FIGS. 1B, 2A, and 3 . The protruding portion  436  may further define an opening  467  to the through-hole, with the opening  467  being located in the textured region  456 . In some cases, the protruding portion  436  may define an arrangement, array, or set of through-holes and openings extending through the protruding portion  436 . For example, the glass cover member  434  may define any number of through-holes and openings, such as one, two, three, four, or five through-holes and openings. 
     The glass cover member  434  may be of unitary construction. For example, the glass cover member  434  may be formed from a single piece of a glass material to define a monolithic glass component. The protrusion  436  may be formed into the glass cover member  434  by a molding or a slumping process to define the protruding profile shape. The protrusion  436  may also be formed into the glass cover member  434  by machining away material around the portion of the glass cover member  434  that is to become the protrusion  436 . In some cases, the exterior surface of the glass cover member  434  formed by an initial shaping process may be ground, polished, or otherwise processed to achieve the desired surface finish(es) as described further with respect to  FIG. 6 . 
     As shown in  FIG. 4 , the raised region  446  of the exterior surface  444  includes a textured region  456 . The textured region  456  may extend across a substantial entirety of the raised region  446  except for the opening(s) such as  467 . For example, the textured region  456  may extend substantially across the plateau defined by the raised region  446  and in some cases may be confined to the plateau. In some cases, the textured region  456  of the raised region  446  may be configured to produce a gloss level which is lower than that of a window or lens of an optical module in the opening  467  (e.g., the window  269  of  FIG. 2A ). The textured region  456  may also be configured to produce a translucent and/or hazy appearance. 
     In some embodiments, the base region  448  and/or the side region  447  of the exterior surface  444  is also textured. In general, each of the various textured regions of the glass cover member  434  may have similar textures to each other or may have different textures from each other. Different textures may result from using different process conditions in a single type of texturing process or may result from using different types of texturing processes. In some embodiments, a textured region of the glass cover member  434  may have a texture formed by overlap of two different textures. Such a texture may result from using two different texturing processes to create the textured region. 
     In one example, the base region  448  and the raised region  446  may both define respective textured regions of the exterior surface  444  (also referred to herein as textured surface regions). For example, the raised region  446  may define a first texture and the base region  448  may define a second texture different than the first texture, as was previously illustrated with respect to  FIGS. 2A-2C . In some cases, the side region  447  (which may also be referred to as a peripheral region) may define a third texture. As examples, the third texture may be the same as the first texture or the second texture or may be formed by an overlap of the first texture and the second texture. As used herein, a texture may include a relatively smooth texture, such as a texture produced by a polishing process. 
     As schematically illustrated in  FIG. 4 , the texture of the textured region  456  (of the raised region  446 ) may be rougher than the texture of the base region  448 . For example, the textured region  456  may have at least one roughness parameter, such as a root mean square surface height, a root mean square slope, and/or a mean peak curvature, which is greater than that of the base region  448 . In some cases, the base region  448  may not include a textured region or may have a smooth texture that is tactilely and/or visually distinct from that of the textured region  456 . For example, the base region  448  may have a relatively smooth texture resulting from a polishing or a glass forming process, such as a texture corresponding to that of a polished surface. 
     In addition, the side region  447  may have a texture which is smoother than that of the textured region  456 . In some cases, the side region  447  may have a texture similar to that of the base region  448 , such as a texture corresponding to that of a polished surface. In some cases, the textured region  456  may not substantially extend along the side region  447 , so that the raised region  446  and the side region  447  are visually distinct. 
     In additional examples, the texture of the textured region  456  (of the raised region  446 ) may be configured to produce a similar visual effect to the texture of the base region  448 . The side region  447  may also define a texture configured to produce a similar effect to the texture(s) of the raised region  446  and the base region  448  in order to provide visual continuity between the base region  448 , the side region  447 , and the raised region  446 . For example, the texture(s) of the base region  448 , the side region  447 , and the raised region  446  may be configured to produce a hazy effect and may have a relatively high value of transmissive haze. 
       FIG. 5  shows a detail view of a textured region  556  of a glass cover member  534 . The textured region  556  may be an example of the textured region  456  of  FIG. 4  in detail area  3 - 3 . The textured region  556  may be defined by a raised region  546  of the exterior surface of the glass cover member  534 , as previously described with respect to  FIG. 4 , and may also be referred to herein as a textured surface region. 
     The textured region  556  comprises a plurality of surface features  580 . The example of the surface features  580  provided in  FIG. 5  is not limiting and in general the surface features  580  of a surface region of the glass cover member  534  may define any of a range of shapes or configurations. The surface features  580  may have a variety of shapes, such as rounded or angular features. As examples, the surface features  580  may define a circular, oval, polygonal, rectangular, or irregular surface contour. Furthermore, the surface features  580  may define protrusions, recesses, or a combination thereof and may have any suitable shape and may be pyramidal, conical, cylindrical, arched, have a curved upper surface or a frustum of a shape such as a cone, and so on. 
     As shown in  FIG. 5 , the surface features  580  may define one or more recesses, such as the surface feature  584 . A recess may define a minimum point, such as the point  585 . The surface features  580  may also define one or more protrusions, such as the surface feature  586 . A protrusion may define a maximum point, such as the point  587 . As schematically shown in  FIG. 5 , the surface features  580  may define a set of minimum points as well as a set of maximum points. The set of maximum points may also be referred to as a set of peaks. The surface features  580  may define a set of recesses, each recess being positioned between adjacent peaks of the set of peaks. The shapes of the peaks and the valleys are not limited to those schematically shown in  FIG. 5 . For example, at least some of the peaks may have a somewhat larger radius of curvature (and smaller curvature) as shown in  FIG. 2B  to provide the desired tactile properties in addition to the desired level of cleanability for the textured surface. 
     In some embodiments, the surface features  580  define a set of hills and valleys. The hills and valleys may be defined using areal texture analysis techniques as described below. The surface feature  586  may generally correspond to a hill feature and the surface feature  584  may generally correspond to a valley feature. In some embodiments, a set of hills and valleys has a substantially uniform spacing between hill features, valley features, or a combination thereof. In additional embodiments, a set of valleys may have a non-uniform or an irregular spacing between hill features and/or valley features. 
     The heights of the surface features  580  may be measured with respect to a reference surface  582 . For example, the heights of the hills may be determined from the maximum points (e.g., point  587 ) and the heights of the valleys may be determined from the minimum points (e.g., point  585 ). The glass cover member  534  may be an example of glass cover member  234  or any other glass cover members described herein. Details of these glass cover members are applicable to the glass cover member  534  and, for brevity, will not be repeated here. 
     In some cases, the textured region  556  may be a mechanically textured region and the surface features  580  may be formed by one or more mechanical grinding and polishing applications. For example, the surface features  580  may result at least in part from brittle fracture of the glass during the grinding and/or polishing process. Surface features resulting from brittle fracture may be more angular than those resulting from ductile fracture or etching. For example, peaks and/or valleys of the texture may be more pointed and/or contain more distinct edges than those resulting from ductile fracture or etching. Further description of operations for forming surface features is provided with respect to  FIG. 6  and, for brevity, is not repeated here. 
     The surface features  580  may be configured to provide particular optical properties to one or more surface regions of the glass cover member  534 , as well as to a cover assembly and electronic device including the glass cover member  534 . However, the surface features  580  defining the texture of the surface region may not be individually visually perceptible. In some cases, the texture of the surface region may cause the glass cover member  534  to appear translucent, rather than transparent. In some cases, the texture may be configured to provide particular levels of such optical properties such as transmissive haze, clarity, gloss, graininess, and combinations thereof. 
     A textured surface region of the glass cover member, such as the textured region  556 , may be configured to provide a specified gloss level to the surface. In some embodiments, the textured region  556  may have a gloss value of less than about 50 gloss units, less than about 40 gloss units, from 5 gloss units to 50 gloss units, from 10 gloss units to 50 gloss units, from 10 gloss units to 45 gloss units, or from 15 gloss units to 45 gloss units as measured at 60 degrees. The gloss level may be measured in the absence of a cosmetic coating. 
     The gloss value of another region of the exterior surface of the glass cover member, such as the base region, may be similar to or different from that of the textured region  556 . For example, the other region of the exterior surface may have a higher gloss than the textured region  556 , such as when the other region has a smoother surface. As another example, the other region of the exterior surface may have a lower gloss than the textured region  556 . For example, the gloss of the other region may be less than about 20 gloss units, less than about 15 gloss units, less than about 10 gloss units, from 5 gloss units to 20 gloss units, or from 10 gloss units to 20 gloss units as measured at 60 degrees. The difference between the gloss of the textured region and the other region may be at least 10% and less than 100% or at least 10% and less than 50%. In some cases, the gloss of the textured region may be measured using commercially available equipment and according to ASTM or ISO standard test methods. The angle measurement may refer to the angle between the incident light and the perpendicular to the textured region of the surface. 
     A textured surface region of the glass cover member, such as the textured region  556 , may be configured to provide a specified level of transmissive haze to the corresponding portion of the glass cover member. In some cases, the transmissive haze of the textured region may be measured using commercially available equipment and according to ASTM or ISO standard test methods. The transmissive haze may relate to the amount of light subject to wide angle scattering (e.g., greater than 2.5 degrees). The transmissive haze may be greater than or equal to about 50%, greater than or equal to about 60%, or greater than or equal to about 70%. For example, the transmissive haze may be from about 60% to about 90% or from about 70% to about 80%. As non-limiting examples, the transmissive haze may be measured using a haze-gard i device available from BYK or a GC 5000L variable photometer available from Nippon Denshoku. The transmissive haze scattering may be measured for the cover assembly or glass cover member as removed from the electronic device. The transmissive haze of another region of the exterior surface of the glass cover member, such as the base region, may be similar to or different from that of textured region  556 . For example, the other region of the exterior surface may have a lower amount of transmissive haze than the textured region  556 , such as less than 50%, less than 40%, less than 30%, or less than 25%. 
     A textured surface region of the glass cover member, such as the textured region  556 , may be configured to provide a specified level of clarity to the corresponding portion of the glass cover member. The clarity or the transmissive narrow angle scattering of the textured region may be measured using commercially available equipment and according to ASTM or ISO standard test methods. The clarity may be less than about 50%, less than about 40%, less than about 30%, less than about 20%, less than about 15%, or less than about 10%. For example, the clarity may be from about 5% to about 30%, from about 5% to about 20%, from about 5% to about 15%, or from about 5% to about 15%. The transmissive narrow angle scattering may be measured using a haze-gard i device available from BYK or a GC 5000L variable photometer available from Nippon Denshoku. A clarity value may be determined from measurements of the intensity in a central region (I central ) and an intensity in a ring around the central region (I ring ). For example, the clarity value may be equal to 100%*(I central −I ring )/(I central −I ring ). The clarity or the transmissive narrow angle scattering may be measured for the cover assembly or glass cover member as removed from the electronic device. 
     In some cases, a textured region of the glass cover member may be configured to provide a specified level of visual uniformity to the corresponding portion of the glass cover member. The level of visual uniformity of another region of the exterior surface of the glass cover member, such as the base region, may be similar to or different from that of textured region  556 . The graininess of a textured region may be measured under diffused illumination using commercially available equipment. The graininess may be measured similarly for a textured region of a cover assembly. In some cases, an image of the textured surface of the glass cover member  534  may be obtained using a digital camera and the lightness of each pixel of the image may be determined, thereby allowing determination of the lightness variation across the textured surface. For example, the BYK-mac device available from BYK may produce a graininess value determined from a histogram of the lightness levels. The graininess of the textured surface may be less than about 1.5 or less than about 1.0. In addition, the graininess may be from about 0.1 to about 1.5, from about 0.1 to about 1.0, from about 0.25 to about 1.5, from about 0.25 to about 1.0, from about 0.5 to about 1.5, or from about 0.5 to about 1.0. These graininess values may be measured prior to application of any cosmetic coating to the glass cover member. 
     A textured surface region of the glass cover member, such as the textured region  556 , may be configured to provide a specified level of cleanability. For example, the texture of the textured region  556  may be configured so that a root mean square (RMS) height of the features is not overly large. The texture may also be configured so that a size of any recessed surface features is sufficiently large to facilitate cleaning. In addition, the texture may be configured so that the root mean square (RMS) slope and/or the mean peak curvature of the surface features is small enough to provide the desired tactile properties in addition to the desired level of cleanability. 
     Surface texture parameters include areal surface texture parameters such as amplitude parameters, spatial parameters, and hybrid parameters. Surface filtering may be used to exclude surface noise and/or surface waviness before determining the surface texture parameters. In addition, a segmentation technique may be used to determine feature parameters such as the maximum diameter, the minimum diameter, the area, and the perimeter. These parameters may be calculated on the basis of the feature shape as projected onto the reference surface (e.g., a reference plane). Mean values may be determined for a given class of surface features (e.g., hills or valleys). Surface texture parameters and methods for determining these parameters (including filtering and segmentation) are described in more detail in International Organization for Standardization (ISO) standard 25178 (Geometric Product Specifications (GPS)—Surface texture: Areal). These surface texture parameters may be measured using commercially available equipment. 
     For example, the surface features  580  of one or more surface regions of the glass cover member  534  may be characterized, in part, by the heights of the surface features. The height may be measured with respect to a reference surface, such as the arithmetical mean of the surface (schematically shown by line  582  in  FIG. 5 ). The heights of the surface features  580  may not be uniform, so that the surface features have a distribution of heights. The magnitude of the heights of the surface features  580  may fall in the range from zero to about 5 microns, zero to about 2.5 microns, from zero to about 2 microns, from zero to about 1.5 microns, or from zero to about 1 micron. The surface features  580  may be characterized by the root mean square height Sq or the arithmetic mean height Sa of the surface. The root mean square (RMS) height of the surface features  580  may be greater than zero and less than about 2.5 microns, greater than zero and less than about 2 microns, greater than zero and less than about 1.5 microns, greater than zero and less than about 1 micron, from about 0.1 microns to about 2.5 microns, from about 0.1 microns to about 2 microns, from about 0.1 microns to about 1.5 microns, from about 0.1 microns to about 1.25 microns, from about 0.1 microns to about 1.0 micron, from about 0.2 microns to about 2.5 microns from about 0.2 microns to about 2 microns, from about 0.2 microns to about 1.5 microns, from about 0.2 microns to about 1.25 microns, from about 0.2 microns to about 1.0 micron, from about 0.25 microns to about 2.5 microns, from about 0.25 microns to about 2 microns, from about 0.25 microns to about 1.5 microns, from about 0.25 microns to about 1.25 microns, from about 0.25 microns to about 1.0 micron, from about 0.5 microns to about 2.5 microns, from about 0.5 microns to about 2 microns, from about 0.5 microns to about 1.5 microns, from about 0.5 microns to about 1.25 microns, or from about 0.5 microns to about 1.0 micron. In some cases, one textured region may be referred to as being rougher than another textured region when it has a greater RMS height. 
     The RMS height of another region of the exterior surface of the glass cover member, such as the base region, may be similar to or different from that of textured region  556 . For example, the RMS height of the raised region may be greater than that of the base region. For example, the RMS height of the raised region may be at least 10% and less than 150%, at least 10% and less than 100%, or at least 10% and less than 50% greater than that of the base region. In some cases, the RMS height of the base region may be similar to that of a polished surface, such as from about 1 nm to about 150 nm, from about 1 nm to about 125 nm, from about 1 nm to about 100 nm, from about 1 nm to about 75 nm, from about 1 nm to about 50 nm, from about 1 nm to about 25 nm, or from 1 nm to about 10 nm. 
     In addition, the surface features  580  of one or more surface regions may be characterized by lateral parameters, such as the distance between peaks. The spacing between peaks may not be uniform, so that there is a distribution of spacings between peaks. The average (mean) distance or spacing between peaks may be referred to as the average pitch or mean pitch. The average pitch may be from about 1 micron to about 20 microns, from about 1 micron to about 15 microns, from about 1 micron to about 10 microns, from about 2.5 microns to about 20 microns, from about 2.5 microns to about 15 microns, from about 2.5 microns to about 10 microns, from about 5 microns to about 20 microns, from about 5 microns to about 15 microns, or from about 5 microns to about 10 microns. 
     In some embodiments, the surface features  580  of one or more surface regions may be configured so to have a particular ratio of the average height of the peaks to the average spacing of the peaks. For example, the ratio of the RMS height to the mean pitch may be from about 0.01 to about 0.6, from about 0.01 to about 0.3, from about 0.02 to about 0.6, from about 0.02 to about 0.3, from about 0.03 to about 0.6, from about 0.03 to about 0.3, from about 0.04 to about 0.6, or from about 0.04 to about 0.3. 
     The surface features  580  of one or more surface regions may also be characterized by a lateral size. For example, the surface features  580  may be characterized by a maximum lateral (or linear) size and a minimum lateral (or linear size). The surface features  580  may have a maximum lateral size small enough that they are not visually perceptible as individual features. In addition, the lateral size and spacing of the surface features  580  may be configured so that the glass cover member has a sufficiently low level of graininess. 
     The surface features  580  of one or more surface regions may be characterized by the root mean square slope (Sdq), also referred to as the root mean square gradient. In some embodiments, the root mean square slope may be greater than zero and less than about 1.25, greater than zero and less than about 1, from 0.1 to less than about 1.25, from about 0.1 to less than about 1, from about 0.25 to less than about 1, from about 0.25 to about 0.75, or from about 0.1 to about 0.5. In some cases, the root mean square slope of the raised region is greater than that of the base region. For example, the root mean square slope of the raised region may be at least 10% and less than 60% greater than that of the base region. 
     The surface features  580  of one or more surface regions may also be characterized by the curvature of the peaks (also referred to as summits), such as by the arithmetic mean summit curvature S SC , also referred to herein as the mean peak curvature. In some embodiments, the arithmetic mean summit curvature is greater than zero and less than about 2.0 microns, greater than zero and less than or equal to about 1.5 microns −1 , from about 0.1 microns −1  to about 2.0 microns −1 , from about 0.1 microns −1  to about 1.5 microns −1 , from about 0.25 microns −1  to about 2.0 microns −1 , from about 0.25 microns −1  to about 1.5 microns −1 , from about 0.5 microns −1  to about 2.0 microns −1 , from about 0.5 microns −1  to about 1.5 microns −1 , from about 0.75 microns −1  to about 2.0 microns −1 , or from about 0.75 microns −1  to about 1.5 microns −1 . In some cases, the mean peak curvature of the raised region is greater than that of the base region. For example, the mean peak curvature of the raised region may be at least 10% and less than 50% greater than that of the base region. 
     The surface features  580  of one or more surface regions may also be characterized by an autocorrelation length. In some embodiments, the autocorrelation length is from about 1 micron to about 50 microns, from about 2 microns to about 30 microns, or from about 3 microns to about 25 microns. 
     As previously described with respect to  FIGS. 2A and 3 , a cosmetic coating may be disposed along an interior surface of the glass cover member  535 . In some cases, the surface features  580  of the glass cover member  534  may be configured to minimize less desirable visual effects when the cosmetic coating is viewed through a textured region, such as the textured region  536 . For example, it may be preferred that the texture does not produce an undesirable amount of visual contrast variation and/or a visual texture. 
       FIG. 6  shows a flow chart of an example process  600  for forming a textured glass component, such as a glass cover member. The textured glass component may be formed from a workpiece or blank of a glass material. The process  600  includes an operation  610  of machining a glass workpiece to form a glass member having a protruding portion, operations  620  and  620  of forming a texture (other than the as-machined texture) on the protruding portion and a base portion of the glass member, and an operation  630  of chemically strengthening the glass member. 
     Typically, the glass material of the workpiece and the member includes a silica-based glass material. The glass material of the glass cover member may have a network structure, such as a silicate-based network structure. In some embodiments, the glass material includes an aluminosilicate glass. As used herein, an aluminosilicate glass includes the elements aluminum, silicon, and oxygen, but may further include other elements. Typically, the glass material includes an ion-exchangeable glass material, such as an alkali metal aluminosilicate glass (e.g., a lithium aluminosilicate glass). An ion-exchangeable aluminosilicate glass may include monovalent or divalent ions which compensate for charges due to replacement of silicon ions by aluminum ions. Suitable monovalent ions include, but are not limited to, alkali metal ions such as Li + , Na + , or K + . Suitable divalent ions include alkaline earth ions such as Ca 2+  or Mg 2+ . The description of suitable glass materials provided with respect to  FIG. 6  is generally applicable to the glass components and cover members described herein. 
     As shown in  FIG. 6 , the process  600  includes an operation  610  of machining a glass workpiece or blank to a desired shape. In some cases, the operation  610  removes glass material from the workpiece or blank to define a glass member having protruding portion and a base portion. For example, the operation  610  may include removing glass around the portion of the workpiece that is to become the protruding portion. In some cases, this portion of the operation  610  may be omitted when the protruding portion is formed via a molding operation. The operation  610  may further include drilling one or more through-holes in the protruding portion. The operation  610  may involve one or more of a computer numerical control (CNC) machining process such as a CNC milling process, a CNC grinding process, and/or a CNC drilling process. In some cases, the protruding portion (e.g., the protruding portion  436 ) has a thickness greater than about 1 mm and less than or equal to about 3 mm and the base portion  438  has a thickness greater than about 0.5 mm and less than about 2 mm after operation  610 . Optionally, the glass member may be washed following the operation  610 . 
     The process  600  further includes an operation  620  of forming a texture on the protruding portion of the glass member. The operation  620  may include using a mechanical treatment to mechanically remove glass material from the protruding portion of the glass member. Mechanical treatments include grinding operations, polishing operations, or combinations thereof. Typically the operation  620  involves removing glass material from the surface of the protruding portion using particles of an abrasive material, such cubic boron nitride, diamond, or silicon carbide. When the operation  620  involves multiple mechanical treatment steps, the earlier steps typically use a coarser abrasive than the later steps. The grinding operation may be CNC grinding process using a fixed abrasive material (e.g., metal or resin bonded to the grinding tool). The polishing operation may use a loose abrasive material, which may be supplied in a slurry to a polishing pad. In some cases, a polishing operation may have a polishing depth (the depth of the glass material removed) which is less than the full height of the surface features resulting from a previous grinding or polishing operation. In some cases, the operation  620  may produce a texture on a raised region of the protruding portion (e.g., a region similar to region  446  in  FIG. 4 ). Optionally, the glass member may be washed following the operation  620 . 
     The process  600  further includes an operation  630  of forming a texture on the base portion of the glass member. In some cases, the operation  630  is different than the operation  620 . For example, the operation  630  may use a different technique than the operation  620  in forming the texture of the base portion. In some cases, the operation  630  may also produce a texture on a side or peripheral region of the protruding portion (e.g., a region similar to region  447  of  FIG. 4 ). Further, in some cases the operation  630  may texture both the base and the protruding portion of the member and then the operation  620  may further texture the protruding portion of the member. Optionally, the glass member may be washed following the operation  630 . 
     In some embodiments, the operation  630  may include a sequence of mechanical removal steps to remove glass material from the surface of the base portion. In some cases, the final step in the sequence may produce a smoother texture than the texture produced by the operation  620 . For example, the final mechanical removal step of the operation  630  may use a finer abrasive and/or apply lesser force than is used in the operation  620 . In some cases, operation  630  produces a texture corresponding to that of a polished surface. 
     In some cases, the operation  630  may include a mechanical removal step followed by an etching step. For example, the mechanical removal step may involve directing a stream of abrasive particles at the base portion using a wet or dry grit blasting process. Following the grit blasting, a chemical etching technique may be used to further remove glass material from the glass member. Some or all of the protruding portion of the glass may be shielded using a mask, such as a wax or polymer mask, during the operation  630 . The chemical etching may occur in the liquid phase or in a gas phase. Etching techniques also include reactive ion etching, which may use a mixture of a fluorine containing compound such as CH 4 , CHF 3 , SF 6  and the like in a gas such as argon or xenon. The etch treatment may etch the glass cover member to a sufficient depth to remove at least some of the small pits, small fissures, or other such features formed during grit blasting. 
     Other techniques for removing a portion of the glass cover member which may be used in the operation  630  include, but are not limited to, chemical etching, mechanical removal of material such as abrasive treatment, laser ablation, lithography in combination with etching, and combinations thereof. In some cases, a laser ablation technique may involve multiple operations of directing a sequence of laser pulses onto a surface of the glass member. 
     The process  600  further includes an operation  640  of chemically strengthening the glass member. In some cases, the operation  640  may take place after the operation  620  and the operation  630  have been completed. In other cases, the operation  640  may take place prior to the final mechanical treatment step (e.g., a polishing step) of the operation  620  and/or the operation  630  has been completed. 
     The operation  640  may include an ion exchange operation which chemically strengthens the glass cover member. During the ion exchange operation, ions present in the glass material can be exchanged for larger ions in a region extending from a surface of the glass cover member. The ion exchange may form a compressive stress layer extending from a surface of the glass cover member, as schematically illustrated in  FIGS. 7 and 8 . In some cases, the operation  640  includes multiple ion exchange operations. In some embodiments, a compressive stress layer is formed at each of the textured exterior surface and the interior surface of the glass cover member. A tensile stress layer may be formed between these compressive stress layers. 
     For example, an ion-exchangeable glass material of the glass member may include monovalent or divalent ions such as alkali metal ions (e.g., Li + , Na + , or K + ) or alkaline earth ions (e.g., Ca 2+  or Mg 2+ ) which may be exchanged for other alkali metal or alkaline earth ions. If the glass member comprises sodium ions, the sodium ions may be exchanged for potassium ions. Similarly, if the glass member comprises lithium ions, the lithium ions may be exchanged for sodium ions and/or potassium ions. In some embodiments, the compressive stress layer extends to a depth (or thickness) in the glass member which is greater than a lowest depth of the surface texture. 
     In an example, the chemical strengthening process involves exposing the glass member to a medium containing the larger ion, such as by immersing the glass member in a bath containing the larger ion or by spraying or coating the glass member with a source of the ions. For example, a salt bath comprising the ion of interest (e.g., a potassium nitrate bath) may be used for ion exchange. Suitable temperatures for ion exchange are above room temperature and are selected depending on process requirements. The ion exchange process may be conducted at a temperature below the strain point of the glass. The glass member may be cooled following the ion exchange operation. Depending on the factors already discussed above, a compression layer as deep as about 10-250 microns can be formed in the glass member. The surface compressive stress (CS) may be from about 300 MPa to about 1100 MPa. A mask can be used to shield portions of the glass member from ion exchange as desired. Optionally, the glass member is washed after the ion exchange operation  640 . 
     In some embodiments, the operations of the process  600  may be performed in a different order than shown in  FIG. 6 . For example, some or all of the operation  630  may precede some or all of the operation  620 , so that the base portion of the member may be at least partially textured before the protruding portion. Further, an operation of forming one or more though holes in the glass member may occur after one or more of the steps of operations  620  and/or  630 . In addition, process  600  may include one or more additional operations. For example, the process  600  may include a separate or additional operation of forming a texture on a side or peripheral region of the protruding portion of the member. In addition, the process  600  may include a washing operation, a polishing operation, and/or a coating operation. 
       FIG. 7  schematically shows a glass cover member  734  after a chemical strengthening operation. The glass cover member  734  includes a protruding portion  736 , a base region  738 , and a textured region  756 . As shown in  FIG. 7 , a compressive stress layer  794  extends from the exterior surface  744  and a compressive stress layer  796  extends from the interior surface  742  of the glass cover member  734  (not shown to scale). The compressive stress layer  794  may therefore be referred to as an exterior compressive stress layer and the compressive stress layer  796  may therefore be referred to as an interior compressive stress layer. The tensile stress layer  795  is positioned between the compressive stress layers  794  and  796 . In the example of  FIG. 7 , the compressive stress layer  794  has substantially the same depth as the compressive stress layer  796 . However, this example is not limiting and in some cases the depth of the compressive stress layer  794  may be different from that of the compressive stress layer  796 . For example, the depth of the compressive stress layer  794  may be substantially greater than that of the compressive stress layer  796 . 
     As examples, the depth of the compressive stress layer  794  may be from 75 microns to 250 microns, from 100 microns to 250 microns, or from 125 microns to 250 microns. In some cases, a compressive stress layer (e.g.,  794 ,  796 , or  798 ) may have a depth greater than the depth of any subsurface features remaining from the texturing process. The depth of the compressive stress layer  796  may be the same as that of the compressive stress layer  794  or may be from about 5 microns to about 100 microns or from about 5 microns to about 50 microns. 
     As shown in  FIG. 7 , the glass cover member  734  also includes a compressive stress layer  798  extending from a wall surface  745  defining a through-hole  735 . For example, the compressive stress layer  798  may be formed when the through-hole  735  is formed prior to a chemical strengthening operation. The compressive stress layer may have a depth substantially the same as that of the compressive stress layer  794  or  796 , or may have some other depth. The glass cover member  734  may be an embodiment of the glass cover member  134  of  FIG. 1B  or any other glass cover member described herein. 
       FIG. 8  schematically shows a glass cover member  834  after a chemical strengthening operation. The glass cover member  834  includes a protruding portion  836 , a base region  838 , and a textured region  856 . As shown in  FIG. 8 , a compressive stress layer  894  extends from the exterior surface  844  and a compressive stress layer  896  extends from the interior surface  842  of the glass cover member  834  (not shown to scale). The tensile stress layer  895  is positioned between the compressive stress layers  894  and  896 . In the example of  FIG. 8 , the compressive stress layer  894  has substantially the same depth as the compressive stress layer  896 . However, this example is not limiting and in some cases the depth of the compressive stress layer  896  may be different from that of the compressive stress layer  894 . For example, the depth of the compressive stress layer may be substantially greater than that of the compressive stress layer  894 . The depths of the compressive stress layers may be as previously described for  FIG. 7  and for brevity that description is not repeated here. 
     As shown in  FIG. 8 , the glass cover member  834  does not include a compressive stress layer extending from a wall surface defining the through-hole  835 . In some cases, a masking operation may be used to prevent ion exchange along this wall surface. The glass cover member  834  may be an embodiment of the glass cover member  134  of  FIG. 1B  or any other glass cover member described herein. 
       FIG. 9  shows a block diagram of a sample electronic device that can incorporate a textured glass component, such as a textured glass cover member. The schematic representation depicted in  FIG. 9  may correspond to components of the devices depicted in  FIGS. 1A-8  as described above. However,  FIG. 9  may also more generally represent other types of electronic devices with cover assemblies as described herein. 
     In embodiments, an electronic device  900  may include sensors  920  to provide information regarding configuration and/or orientation of the electronic device in order to control the output of the display. For example, a portion of the display  908  may be turned off, disabled, or put in a low energy state when all or part of the viewable area of the display  908  is blocked or substantially obscured. As another example, the display  908  may be adapted to rotate the display of graphical output based on changes in orientation of the device  900  (e.g., 90 degrees or 180 degrees) in response to the device  900  being rotated. 
     The electronic device  900  also includes a processor  906  operably connected with a computer-readable memory  902 . The processor  906  may be operatively connected to the memory  902  component via an electronic bus or bridge. The processor  906  may be implemented as one or more computer processors or microcontrollers configured to perform operations in response to computer-readable instructions. The processor  906  may include a central processing unit (CPU) of the device  900 . Additionally, and/or alternatively, the processor  906  may include other electronic circuitry within the device  900  including application specific integrated chips (ASIC) and other microcontroller devices. The processor  906  may be configured to perform functionality described in the examples above. 
     The memory  902  may include a variety of types of non-transitory computer-readable storage media, including, for example, read access memory (RAM), read-only memory (ROM), erasable programmable memory (e.g., EPROM and EEPROM), or flash memory. The memory  902  is configured to store computer-readable instructions, sensor values, and other persistent software elements. 
     The electronic device  900  may include control circuitry  910 . The control circuitry  910  may be implemented in a single control unit and not necessarily as distinct electrical circuit elements. As used herein, “control unit” will be used synonymously with “control circuitry.” The control circuitry  910  may receive signals from the processor  906  or from other elements of the electronic device  900 . 
     As shown in  FIG. 9 , the electronic device  900  includes a battery  914  that is configured to provide electrical power to the components of the electronic device  900 . The battery  914  may include one or more power storage cells that are linked together to provide an internal supply of electrical power. The battery  914  may be operatively coupled to power management circuitry that is configured to provide appropriate voltage and power levels for individual components or groups of components within the electronic device  900 . The battery  914 , via power management circuitry, may be configured to receive power from an external source, such as an alternating current power outlet. The battery  914  may store received power so that the electronic device  900  may operate without connection to an external power source for an extended period of time, which may range from several hours to several days. 
     In some embodiments, the electronic device  900  includes one or more input devices  918 . The input device  918  is a device that is configured to receive input from a user or the environment. The input device  918  may include, for example, a push button, a touch-activated button, capacitive touch sensor, a touch screen (e.g., a touch-sensitive display or a force-sensitive display), capacitive touch button, dial, crown, or the like. In some embodiments, the input device  918  may provide a dedicated or primary function, including, for example, a power button, volume buttons, home buttons, scroll wheels, and camera buttons. 
     The device  900  may also include one or more sensors  920 , such as a force sensor, a capacitive sensor, an accelerometer, a barometer, a gyroscope, a proximity sensor, a light sensor, or the like. The sensors  920  may be operably coupled to processing circuitry. In some embodiments, the sensors  920  may detect deformation and/or changes in configuration of the electronic device and be operably coupled to processing circuitry which controls the display based on the sensor signals. In some implementations, output from the sensors  920  is used to reconfigure the display output to correspond to an orientation or folded/unfolded configuration or state of the device. Example sensors  920  for this purpose include accelerometers, gyroscopes, magnetometers, and other similar types of position/orientation sensing devices. In addition, the sensors  920  may include a microphone, acoustic sensor, light sensor, optical facial recognition sensor, or other types of sensing device. 
     In some embodiments, the electronic device  900  includes one or more output devices  904  configured to provide output to a user. The output device  904  may include display  908  that renders visual information generated by the processor  906 . The output device  904  may also include one or more speakers to provide audio output. The output device  904  may also include one or more haptic devices that are configured to produce a haptic or tactile output along an exterior surface of the device  900 . 
     The display  908  may include a liquid-crystal display (LCD), a light-emitting diode (LED) display, an LED-backlit LCD display, an organic light-emitting diode (OLED) display, an active layer organic light-emitting diode (AMOLED) display, an organic electroluminescent (EL) display, an electrophoretic ink display, or the like. If the display  908  is a liquid-crystal display or an electrophoretic ink display, the display  908  may also include a backlight component that can be controlled to provide variable levels of display brightness. If the display  908  is an organic light-emitting diode or an organic electroluminescent-type display, the brightness of the display  908  may be controlled by modifying the electrical signals that are provided to display elements. In addition, information regarding configuration and/or orientation of the electronic device may be used to control the output of the display as described with respect to input devices  918 . In some cases, the display is integrated with a touch and/or force sensor in order to detect touches and/or forces applied along an exterior surface of the device  900 . 
     The electronic device  900  may also include a communication port  912  that is configured to transmit and/or receive signals or electrical communication from an external or separate device. The communication port  912  may be configured to couple to an external device via a cable, adaptor, or other type of electrical connector. In some embodiments, the communication port  912  may be used to couple the electronic device  900  to a host computer. 
     The electronic device  900  may also include at least one accessory  916 , such as a camera, a flash for the camera, or other such device. The camera may be part of a camera assembly which may be connected to other parts of the electronic device  900  such as the control circuitry  910 . 
     As used herein, the terms “about,” “approximately,” “substantially,” “similar,” and the like are used to account for relatively small variations, such as a variation of +/−10%, +/−5%, +/−2%, or +/−1%. In addition, use of the term “about” in reference to the endpoint of a range may signify a variation of +/−10%, +/−5%, +/−2%, or +/−1% of the endpoint value. In addition, disclosure of a range in which at least one endpoint is described as being “about” a specified value includes disclosure of the range in which the endpoint is equal to the specified value. 
     The following discussion applies to the electronic devices described herein to the extent that these devices may be used to obtain personally identifiable information data. It is well understood that the use of personally identifiable information should follow privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy of users. In particular, personally identifiable information data should be managed and handled so as to minimize risks of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to users. 
     The foregoing description, for purposes of explanation, used specific nomenclature to provide a thorough understanding of the described embodiments. However, it will be apparent to one skilled in the art that the specific details are not required in order to practice the described embodiments. Thus, the foregoing descriptions of the specific embodiments described herein are presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the embodiments to the precise forms disclosed. It will be apparent to one of ordinary skill in the art that many modifications and variations are possible in view of the above teachings.

Metadata:
Filing Date: 20190909
Publication Date: 20210831
Grant Date: 20210831
Priority Date: 20190605
Inventors: SHANNON, JASON P.
LIMARGA, Andi M.
Assignee: APPLE INC
CPC Classifications: [{"code": "H04N23/57", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04N23/54", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04N23/51", "inventive": true, "first": false, "tree": "[]"}, {"code": "H05K5/03", "inventive": true, "first": true, "tree": "[]"}, {"code": "C03C21/002", "inventive": true, "first": false, "tree": "[]"}, {"code": "H05K5/0217", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04M1/0264", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F1/1686", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F1/1656", "inventive": true, "first": true, "tree": "[]"}, {"code": "C03C15/00", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F1/1686", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F1/1626", "inventive": true, "first": false, "tree": "[]"}, {"code": "H05K5/03", "inventive": true, "first": true, "tree": "[]"}, {"code": "G06F1/1626", "inventive": true, "first": false, "tree": "[]"}, {"code": "C03C19/00", "inventive": true, "first": false, "tree": "[]"}, {"code": "H05K5/0017", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04B1/3827", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F1/1686", "inventive": true, "first": false, "tree": "[]"}, {"code": "C03C15/00", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04B1/3827", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04N5/2253", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04N5/2257", "inventive": true, "first": false, "tree": "[]"}, {"code": "H05K5/0017", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04M1/0264", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F1/1626", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04N5/2252", "inventive": true, "first": false, "tree": "[]"}, {"code": "C03C19/00", "inventive": true, "first": false, "tree": "[]"}, {"code": "C03C21/002", "inventive": true, "first": false, "tree": "[]"}, {"code": "H05K5/03", "inventive": true, "first": true, "tree": "[]"}]
Family ID: 70918235