US20130215642A1 - Portable Computer Housing with Integral Display - Google Patents
Portable Computer Housing with Integral Display Download PDFInfo
- Publication number
- US20130215642A1 US20130215642A1 US13/855,259 US201313855259A US2013215642A1 US 20130215642 A1 US20130215642 A1 US 20130215642A1 US 201313855259 A US201313855259 A US 201313855259A US 2013215642 A1 US2013215642 A1 US 2013215642A1
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- United States
- Prior art keywords
- light guide
- light
- housing
- guide panel
- structures
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1615—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function
- G06F1/1616—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
Abstract
An electronic device such as a portable computer may have a housing with a rectangular recess in which layers of display structures such as a light guide panel layer and other light guide structures are directly mounted without intervening chassis members. Mating alignment features in the housing and display structures may be used to align the display structures relative to the housing. A display may be formed from glass layers such as a color filter glass layer and a thin-film transistor glass layer. Backlight for the display may be generated by an array of light-emitting diodes. The light guide panel may direct light from the light-emitting diodes through the glass layers. A clamp may be used to hold the light-emitting diodes and light guide structures in place in the recess. An undercut in the housing may also hold the light guide structures in place.
Description
- This application claims the benefit of provisional patent application No. 61/257,807, filed Nov. 3, 2009, which is hereby incorporated by reference herein in its entirety.
- This invention relates to electronic devices and, more particularly, to display structures for electronic devices such as portable computers.
- Portable computers typically have upper and lower housing portions that are connected by a hinge. The lower housing portion contains components such as printed circuit boards, disk drives, a keyboard, and a battery. The upper housing portion contains a display. When the computer is in an open configuration, the upper housing portion is vertical and the display is visible to the user of the portable computer. When the computer is closed, the upper housing lies flat against the lower housing. This protects the display and keyboard and allows the portable computer to be transported.
- Portable computer displays typically contain fragile structures such as layers of glass. Displays can therefore be challenging to mount properly within the upper housing. If care is not taken, the display and the surrounding portions of the upper housing will be bulky and unsightly. At the same time, the elimination of certain structures in the display may result in display that is overly fragile. This could lead to damage to the display during normal use.
- It would therefore be desirable to be able to provide improved display structures in electronic devices such as portable computers.
- An electronic device such as a portable computer may have a housing. The housing may have upper and lower portions that are connected by a hinge. Display structures for a display may be mounted in a portion of the housing such as the upper housing portion.
- The display structures may include a color filter glass layer and a thin-film transistor substrate layer. Light-guide structures may be mounted under the thin-film transistor substrate layer. The light guide structures may include a reflective sheet of material such as white polyester (e.g., Mylar®), a layer of light guide material (sometimes referred to as a light guide panel or LGP), and one or more layers of optical film (e.g., diffuser layers, light collimating layers, etc.). The light guide structures may be mounted directly in a rectangular recess in the interior of the housing without using chassis structures. For example, the light guide structures may be provided with tabs that mate directly with corresponding features in the housing.
- Undercut structures may be formed in the housing to accommodate the display structures. For example, the undercut structures may receive some or all of the light guide structures.
- An array of light-emitting diodes may provide backlight for the display structures. The light-emitting diodes may emit light into an edge of the light guide panel. A reflective sheet on the rear of the light guide panel may be used to reflect light outwards through the display structures. The edges of the reflective sheet may be wrapped around the edges of the light guide panel to reflect light that would otherwise leak out of the edges of the panel. Light may also be reflected by coating interior housing surfaces with a reflective coating.
- Clamp structures may be used to hold the light-emitting diode array and light-guide panel in place.
- Reflective tape and reflective sheets of material may be used to help guide light from the light-emitting diode array into the edge of the light guide panel. Reflective tape may be placed on the lower surface of a clamp member.
- A cosmetic bezel may be used to cover edges of the display structures. For example, in display structure configurations in which a driver integrated circuit might be visible from the exterior of the device, a bezel may be used to hide the integrated circuit from view.
- Further features of the invention, its nature and various advantages will be more apparent from the accompanying drawings and the following detailed description of the preferred embodiments.
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FIG. 1 is a perspective view of an illustrative portable computer with display structures in accordance with an embodiment of the present invention. -
FIG. 2 is a cross-sectional side view of a conventional liquid crystal display (LCD) module in a portable computer display housing. -
FIG. 3 is a cross-sectional side view of an edge portion of a conventional LCD module. -
FIG. 4 is an exploded view of a conventional computer housing and conventional display structures. -
FIG. 5 is a cross-sectional side view of a conventional light-emitting-diode array in a conventional display module. -
FIG. 6 is a perspective view of conventional light-emitting-diodes mounted on a flex circuit. -
FIG. 7 is a cross-sectional side view of conventional backlight component in a conventional computer housing. -
FIG. 8 is a cross-sectional side view of illustrative display structures in an electronic device such as a portable computer in accordance with an embodiment of the present invention. -
FIG. 9 is an exploded view showing how display components may be mounted directly in a recess in a computer housing in accordance with an embodiment of the present invention. -
FIG. 10 is a top view of a computer housing in which a ledge has been formed to ensure that a light guide panel does not damage an associated array of light-emitting diodes in accordance with an embodiment of the present invention. -
FIG. 11 is a cross-sectional side view of illustrative display structures in an electronic device such as a computer in which a device housing has been provided with an undercut groove portion to accommodate an edge of a light guide panel and other light guide components in accordance with an embodiment of the present invention. -
FIG. 12 is a perspective view showing how light guide components may have alignment features such as tabs that mate with corresponding housing alignment features such as tab-shaped recesses in accordance with an embodiment of the present invention. -
FIG. 13 is a perspective view showing how a reflective layer may be wrapped around the back and edges of a light guide panel to ensure that light is reflected back into the panel in accordance with an embodiment of the present invention. -
FIG. 14 is a perspective view of a portion of an electronic device housing showing how a clamp structure may be used to help retain an array of light emitting diodes while reflecting and guiding light that is produced by the light emitting diodes in accordance with an embodiment of the present invention. -
FIG. 15 is a cross-sectional side view of an illustrative electronic device showing how a planar clamp structure may be used to help retain an array of light emitting diodes in accordance with an embodiment of the present invention. -
FIG. 16 is a cross-sectional side view of a light-emitting diode array showing how a reflective sheet may be placed over the edge of the light-emitting diode flex circuit in accordance with an embodiment of the present invention. -
FIG. 17 is a cross-sectional side view of a light-emitting diode array showing how reflective tape may be placed over the edge of the light-emitting diode flex circuit and under the edge of a reflective sheet in accordance with an embodiment of the present invention. -
FIG. 18 is a cross-sectional side view of a light-emitting diode array showing how a reflective coating such as reflective paint may be used to reflect light in accordance with an embodiment of the present invention. -
FIG. 19 is a cross-sectional side view of a light-emitting diode array showing how exposed interior surfaces of a computer housing may be coated with reflective coating such as reflective paint in accordance with an embodiment of the present invention. -
FIG. 20 is a cross-sectional side view of an illustrative electronic device such as a computer in which a bezel is used in covering display structures in accordance with an embodiment of the present invention. - An illustrative electronic device such as a portable computer in which display structures may be provided is shown in
FIG. 1 . As shown inFIG. 1 ,portable computer 10 may have housing 12.Housing 12, which is sometimes referred to as a case, may be formed from one or more individual structures. For example,housing 12 may have a main structural support member that is formed from a solid block of machined aluminum or other suitable metal. One or more additional structures may be connected to thehousing 12. These structures may include, for example, internal frame members, external coverings such as sheets of metal, etc.Housing 12 and its associated components may, in general, be formed from any suitable materials such as such as plastic, ceramics, metal, glass, composites, etc. An advantage of forminghousing 12 at least partly from metal is that metal is durable and attractive in appearance. Metals such as aluminum may be anodized to form an insulating oxide coating. - In general, the components of
portable computer 10 can be formed from any suitable materials. As examples, the components ofportable computer 10 may be formed from materials such as metals (e.g., aluminum, stainless steel, alloys of metals, electroplated metals, plated and other coated metals, etc.), plastics (e.g., polycarbonate (PC) plastics, acrylonitrile butadiene styrene (ABS) plastics, thermoplastics, PC/ABS plastic blends, etc.), composite materials (e.g., carbon fibers or other fibers bound by a binder such as a polymer resin), plastics that have been injection molded around metal structures, laminated plastic layers, ceramics, metal, glass, composites, metal-filled epoxy, other suitable materials, and combinations of these and other materials. Components ofportable computer 10 which are described herein as being formed from one or more specific materials (e.g.,housing 12 which is sometimes described herein as being formed from machined aluminum as an example) can be formed from any of the above-mentioned materials, other suitable materials, or combinations of such materials. -
Housing 12 may have anupper portion 26 and alower portion 28.Lower portion 28 may be referred to as the base or main unit ofcomputer 10 and may contain components such as a hard disk drive, battery, and main logic board.Upper portion 26, which is sometimes referred to as a cover, lid, or display housing, may rotate relative tolower portion 28 aboutrotational axis 16.Portion 18 ofcomputer 10 may contain a hinge and associated clutch structures and is sometimes referred to as a clutch barrel. -
Lower housing portion 28 may have a slot such asslot 22 through which optical disks may be loaded into an optical disk drive. Lower housing portion may also have a touchpad such astouchpad 24 and may havekeys 20. If desired, additional components may be mounted to upper andlower housing portions lower housing portions housing 12. Speaker openings such asspeaker openings 30 may be formed inlower housing portion 28 by creating an array of small openings (perforations) in the surface ofhousing 12. - A display such as
display 14 may be mounted withinupper housing portion 26.Display 14 may be, for example, a liquid crystal display (LCD), organic light emitting diode (OLED) display, or plasma display (as examples).Display 14 may contain a number of layers of material. These display structures may include, for example, layers of optically transparent materials such as plastic and glass. Layers of plastic and optical adhesive may also be incorporated intodisplay 14. In a liquid crystal display, layers of polarizer, light diffusing elements and light guides for backlight structures, a liquid crystal layer, and a thin-film transistor array that drives the image pixels in the display may be incorporated into the display. -
Computer 10 may have input-output components such astouch pad 24.Touch pad 24 may include a touch sensitive surface that allows a user ofcomputer 10 to controlcomputer 10 using touch-based commands (gestures). A portion oftouchpad 24 may be depressed by the user when the user desires to “click” on a displayed item onscreen 14. - A cross-sectional side view of a conventional liquid crystal display (LCD) display module mounted in a computer housing is shown in
FIG. 2 . As shown inFIG. 2 ,display module 32 may havedisplay structures 46 such as an upper polarizer layer, a color filter, a thin-film transistor glass layer, a lower polarizer, and a layer of light-guide structures. The light guide structures may include a reflective bottom sheet, a light guide panel that guides light from an array of edge-mounted light-emitting diodes over the full surface area of the display, and layers of optical films such as diffuser layers.Display module 32 may also have a plastic chassis member such asplastic chassis member 44 and a metal chassis member such asmetal chassis member 42 into which the layers of glass and other display module structures may be mounted.Cover glass 36 may be placed on top ofstructures 46. -
Metal chassis member 42 may have a tab with a hole through which screw 40 passes.Screw 40 may be screwed into a threaded hole inhousing 34. In the arrangement ofFIG. 2 ,housing 34 is formed of aluminum. The presence of the extending tab portion ofchassis 42 allowsmodule 32 to be firmly secured inhousing 34, but adds undesirable width to the perimeter ofdisplay module 32. -
Elastomeric gasket 38 is used to form a cushioned interface betweencover glass layer 36 andhousing 34. This helps to prevent damage to coverglass layer 36.Cover glass 36 is formed from clear glass and helps to protectlayers 46 ofLCD module 32 from damage, but adds undesirable thickness. - Another cross-sectional view of a conventional liquid crystal display module is shown in
FIG. 3 . As shown inFIG. 3 ,display module 32 may have polarizers such asupper polarizer layer 50 andlower polarizer 62.Light guide structure 64 may provide backlight formodule 32. The light fromstructure 64 passes through the display pixels ofmodule 32 and exits displaymodule 32 indirection 31. - Color
filter glass layer 52,liquid crystal layer 54, and thin-film transistor (TFT)glass layer 58 are interposed between polarizer layers 50 and 62. - The polarization of individual pixels of liquid crystal material in
liquid crystal layer 54 interacts with the polarizing effects oflayers filter glass layer 52 contains an array of colored filters that providedisplay 32 with the ability to represent different colors. The polarization of liquid crystal material inliquid crystal layer 54 is controlled electrically by thin-film transistor array 56. Thin-film transistors inarray 56 are formed on the upper surface of thin-film transistor (TFT)glass layer 58. - Thin-
film transistors 56 are controlled by drivers contained indriver circuit 60.Color filter layer 52 is horizontally (laterally) recessed with respect toTFT layer 58 to form a ledge on whichdriver circuit 60 is mounted. In a typical display module, there may be a number of driver chips such ascircuit 60 that are mounted around the periphery of the display. Conductive traces on the upper surface ofTFT layer 58interconnect driver circuit 60 with thin-film transistors 56. - In conventional arrangements of the type shown in
FIG. 3 ,black ink 48 is placed on the underside ofcover glass 36 around the periphery of the display. This creates an opaque region that blocks inactive peripheral portions ofdisplay module 32 from view.Black ink 48 can also hide mounting structures such asscrew 40 ofFIG. 2 from view.Display glass 36 may help provide structural support to the display housing of the portable computer in whichdisplay module 32 is mounted, but the presence ofglass 36 can add a non-negligible amount of extra thickness and weight to a display. - An exploded view of a conventional display and computer housing is shown in
FIG. 4 . As shown inFIG. 4 ,light guide structures 64 may havetabs 68 that mate with recesses inplastic chassis 44. Light-emittingdiode array 66 is covered with plastic chassis parts inregions 72. In region 74, part of metal chassis 42 (shown asmetal chassis portion 42′) is bent up and over the light-emitting diode array to hold the array in place.Chassis 42 andchassis 44 may be mounted inhousing 34. - A cross-sectional side view of the conventional structures of
FIG. 4 taken along line 76-76 ofFIG. 4 is shown inFIG. 5 . As shown inFIG. 5 ,light guide structures 64 include reflective polyester sheet 80 (e.g., white polyester), light-guide panel 82, andoptical films 84.Metal chassis portion 42′ covers light-emittingdiode array 66. Light-emittingdiode array 66 contains light-emitting diodes that provide backlight for the display. The light-emitting diode chips are mounted on flexible printed circuit (“flex circuit”) 78. The edge ofreflective sheet 80 covers the edge offlex circuit 78. -
FIG. 6 shows a perspective view of a conventional light-emitting diode array containing light-emittingdiodes 66 andflex circuit substrate 78. - Conventional
light guide structures 64 may be provided with a peripheral strip of double-sided tape, as shown bytape 86 inFIG. 7 . -
FIG. 8 shows a cross-sectional side view of a portion ofupper housing 26 of device 10 (FIG. 1 ) in which displaystructures 106 have been mounted.Upper housing 26 may, for example, be formed from machined aluminum.Elastomeric gasket 104 may be used to provide a soft interface between potentially fragile glass layers instructures 106 andhousing 26. -
Display structures 106 may produce an image using any suitable display technology (e.g., light-emitting diodes such as an array of organic light-emitting diodes, liquid crystal display pixels, plasma-based pixels, etc.). In general,display structures 106 may be formed from any suitable materials (e.g., plastic, glass, other optically suitable materials, etc.). An arrangement in which displaystructures 106 are based on liquid crystal display (LCD) technology is sometimes described herein as an example. The use of LCD structures indisplay structures 106 is, however, merely illustrative.Display structures 106 may, in general, be formed from any suitable type of display structures. - As shown in
FIG. 8 ,display structures 106 may have anupper polarizer layer 102 and alower polarizer layer 96.Light guide structures 88 may provide backlight forstructures 106. Light-guide structures 88 may include reflective structures such as reflective sheet 90 (e.g., white polyester), light-guide panel 92, andoptical films 94.Optical films 94 may include a diffuser layer and light collimating layers (as an example). If desired, light reflection functions may be provided byhousing 26.Housing 26 may be formed from a reflective material such as metal and/or the interior surfaces ofhousing 26 may be coated with a reflective coating such white paint or ink, silver paint or ink, a reflective material such as chromium, etc. In arrangements in whichhousing 26 is highly reflective, some or all ofreflective sheet 90 may be omitted. - Clearances D2 and D1 help prevent damage to display
structure 106 during use ofdevice 110. In a typical arrangement, clearance D2 may be about 1.2 to 1.8 mm and clearance D1 may be about 0.11 mm. End clearance D3 may be about 0.3 mm. - Light from a light-emitting diode array or other backlight source is provided to an edge of
light guide panel 92.Panel 92 and the other structures inlight guide structures 88 direct this light upwards indirection 108 through thinfilm transistor layer 98 andcolor filter layer 100. - Thin-film transistor
substrate glass layer 98 may contain thin-film transistors inarray 110. Colorfilter glass layer 100 may contain an array of optical filters of different colors to providedisplay structures 106 with the ability to display color images.Color filter layer 100 may be formed from glass into which dye of different colors has been impregnated, from a glass layer coated with a pattern of colored dye, from a glass or plastic layer that is covered with a pattern of thin colored filter structures (e.g., filters formed from polymer or glass containing dye), or any other suitable color filter structures.Liquid crystal layer 112 may be controlled by the electric fields produced by the thin-film transistors ofarray 110. - As shown in
FIG. 8 , the layer of cover glass that is present in conventional display modules need not be present indisplay structures 106 anddevice 10. Rather,color filter layer 100 may serve as the uppermost glass layer instructures 106 anddevice 10. To ensure thatstructures 106 are sufficiently robust,color filter layer 100 may be thickened or may be stiffened using support structures withindisplay structures 106.Color filter layer 100 may be formed of a durable clear layer (e.g., a strong glass or plastic) that resists damage from contact. Anti-scratch coatings may also be provided on the surface of color filter layer 100 (e.g., as part ofpolarizer layer 102 or above polarizer layer 102). - To hide the peripheral portions of
display structures 106 that lie along the outer edges ofdisplay housing 26 from view, an opaque material such asink layer 114 may be incorporated around the periphery ofdisplay structures 106 to form a border.Opaque layer 114 may be formed on the underside ofcolor filter layer 100 or on the upper surface of thin-film transistor glass layer 98 (as examples). The opaque material may have any suitable color (e.g., black, grey, silver, white, blue, red, etc.). - With the arrangement of
FIG. 8 ,color filter layer 100 and thin-film transistor layer 98 extend outwardly (in the leftward direction in the orientation ofFIG. 8 ) so as to form an overhangingportion 116 that is supported by the matching ledge inhousing 26. If desired, onlycolor filter layer 100 may extend in this way (e.g., so that the overhanging portion oflayer 100 rests on the ledge formed by housing 26). In this type of arrangement, the thin-film transistor layer may extend only as far as light-guide structures 88 ofFIG. 8 . If desired, portions ofgasket 104 may be interposed betweendisplay structures 106 andhousing 26 inregion 116, as illustrated by protrudinglower lip portion 105 ofgasket 104 in the example ofFIG. 8 .Display driver circuitry 118 may, if desired, be formed in region 116 (e.g., as part of thinfilm transistor layer 98 or in a chip mounted on thin film transistor layer or color filter layer 100). - To ensure that
light guide structures 88 are properly aligned withinhousing 26 even in the absence of conventional structures such asplastic chassis 44 and metal chassis 42 (FIG. 2 ),housing 26 may be provided with alignment features such asrectangular recesses 122 ofFIG. 9 that mate with corresponding alignment features onlight guide structures 88 such as protrudingtabs 120 ofFIG. 9 . Whenhousing 26 is formed by a molding process (e.g., plastic injection molding), alignment features can be molded intohousing 26 as part of the housing fabrication process. Whenhousing 26 is formed by a machining process (e.g., a process in which an aluminum block or other block of material is machined using a computer-controlled machining tool), alignment features can be machined directly into the aluminum housing. In the example ofFIG. 9 , there are fouralignment tabs 120 and four corresponding housing pockets 122. This is merely illustrative. There may be one tab and one recess, two or more tabs and recesses, etc. - Light-emitting
diode array 122 may be received withinrecess 124 inhousing 26.Rectangular recess 134 inhousing 26 may be sized to receive the rectangular outline oflight guide structures 88. The depth of these recesses inhousing 26 may be about 0.2 mm to 5 mm (as an example). The diagonal distance across the rectangularlight guide structures 88 may be, for example, 5 to 20 inches. - With an arrangement of the type shown in
FIG. 9 , recesses 122 andtabs 120 may help align light guide inrecess 134. For example, tabs may hold at least one of the edges oflight guide structures 88 at a slight distance (clearance) fromhousing 26 to avoid creating pressure that might otherwise bucklelight guide structures 88. Alongedge 136structures 88 may, if desired, protrude under a lip in housing 26 (i.e., a lip that forms a capturing groove). This optional lip (groove) may help retainlight guide structures 88 in housing 26 (e.g., by receiving and retaining the edge of light guide structures 88). Along edge 138 ofhousing 26,clamp structure 130 may be used to help retainlight guide structures 88 and light-emittingdiode array 122 inhousing 26.Clamp structure 130 may be secured tohousing 26 using adhesive, fasteners such asscrews 132, or other suitable attachment mechanisms.Screws 132 may pass throughholes 128 inclamp 130 and may be received in threadedholes 126 in housing 26 (as an example).Clamp structure 130 may be formed in a single piece (as shown inFIG. 9 ) or one or more separate members may be used in formingclamp structure 130. -
Clamp structure 130 may be formed from metal, plastic, composites, or other materials. For example,clamp structure 130 may be formed from a material such as stainless steel. Stainless steel can be formed in thin sheets that are relatively stiff, allowing the thickness ofclamp structure 130 to be minimized.Housing 26 may be formed from aluminum or one or more other materials that are molded or machined into a desired shape (e.g., to form the alignment tab recesses ofFIG. 9 and the rectangular recess that receives rectangular light guide structures 88). - To help ensure that
light guide structures 88 do not bear against light-emittingdiode array 122 with excessive force,recess 134 may have lips such aslip 140. As shown in more detail inFIG. 10 ,lip 140 ofhousing 26 may help preventedge 142 oflight guide structures 88 from directly contacting light-emittingdiode array 122. The nominal clearance D4 betweenedge 142 and light-emittingdiodes 122 may be, for example, 0 mm to 1 mm. - As shown in
FIG. 11 , a portion of housing 26 (e.g., the portion along edge 134) may be provided with an undercut. Inregion 148, for example,lip 144 may extend outwards over undercut opening 146 to form a groove.Groove opening 146 may receive the edge oflight guide structures 88, allowing the edge ofhousing 26 that surroundsdisplay structure 106 to be narrowed. - A perspective view of one of recesses 122 (i.e., an alignment notch) and one of matching
tabs 120 onlight guide structures 88 is shown inFIG. 12 . A strip oftape 150 with a layer of adhesive 152 may be placed overtabs 120. The tape may stick tohousing 26 inregions 154 to holdtabs 120 in place inrecess 122.Tape 150 may be removed to permit rework. If desired, recesses 122 may be provided with integral housing lips (i.e., recesses 122 may be implemented as covered notches rather than as exposed notches). This may help avoid the need for tape strips 150, but may require thatlight guide structures 88 be flexed slightly as part of the assembly process (i.e., to tucktabs 120 into the covered notches and any grooves in the housing). - Light-emitting diodes 122 (
FIG. 9 ) emit light into the edge of light-guide panel 92.Light guide panel 92 directs the emitted light upwards through layers such aslayers light guide panel 92 should be minimized. With one suitable arrangement, the side walls ofhousing recess 134 that surround the edges oflight guide panel 92 and the otherlight guide structures 88 may be machined to form a reflective surface or may be coated with white paint, chromium, or other reflective coatings. With another suitable arrangement, which is shown inFIG. 13 , the edges of reflective sheet 90 (i.e., edges 156 and 158) may be wrapped upwards so as to surround the edges oflight guide panel 92 andoptical films 94. By reflecting light back into the edges oflight guide panel 92, backlight that would otherwise be wasted is properly directed through the display. - In arrangements of the type shown in
FIG. 13 ,reflective sheet 90 and wrapped reflective sheet edges 156 and 158 are formed from a unitary piece of material. If desired, separate layers of reflective material may be used for the main rear reflective sheet layer and for the reflective edges (as an example). - A perspective view of an illustrative clamping arrangement in which reflective tape is used to help ensure satisfactory backlight performance is shown in
FIG. 14 .Clamp 130 hasbends 162 that allowclamp 130 to pass over housing structures such aswall 166.Screws 132 may pass throughholes 128 and into threadedholes 126 inhousing 26 to holdclamp 130 in place over light-emittingdiodes 122. A strip of reflective material such asreflective tape 160 may be attached alongedge 164 ofclamp 130.Tape 160 may help to reflect light fromdiodes 122 into the edge oflight guide panel 92. - A cross-sectional side view of an illustrative mounting arrangement that uses a planar clamp is shown in
FIG. 15 . As shown inFIG. 15 ,driver circuitry 118 may be implemented using separate integrated circuits (as an example).Planar clamp structure 130 may be attached tohousing 26 using screws such asscrew 132.Reflective tape 160 may be placed above light-emittingdiodes 122 to help guide light 172 into the edge oflight guide panel 92.Reflective sheet 90 may be placed below the lower surface oflight guide panel 92 to reflect escaping light back intolight guide panel 92. Additional reflective structures such asreflective tape 170 may provide further light reflection. Light-emittingdiodes 122 may be mounted on a substrate such asflex circuit 168.Tape 170 can be placed over the edge offlex circuit 168 as shown inFIG. 15 . - If desired, the edge of
reflective sheet 90 may overlap the edge offlex circuit 168. This type of arrangement is shown inFIG. 16 . -
FIG. 17 shows howtape 170 may have one edge that is placed overflex circuit 168 and one edge that is placed under reflective sheet 90 (as shown in the example ofFIG. 15 ). - Light may also be reflected using reflective coatings. For example,
tape 170 may be omitted andflex circuit 168 may be coated withreflective coating 174, as shown inFIG. 18 . Coating 174 may be formed from reflective coating such as white paint or white ink, from a shiny substance such as a metallic paint or a metal coating, or other reflective materials. - In the illustrative configuration of
FIG. 19 ,housing 26 has been provided withreflective coating 174. Some ofreflective coating 174 has also been formed over exposededge 176 offlex circuit 168.Reflective coating 174 may be formed by physical vapor deposition (e.g., sputtering), by silk screen printing, pad printing, spray coating, electrochemical deposition, electroplating, manual application with a paint brush or foam pad, ink jet printing, etc. - If desired, a bezel may be used in covering display components. This type of arrangement is shown in
FIG. 20 . As shown inFIG. 20 ,bezel 178 may cover edge portions ofdisplay structures 106.Bezel 178 may be formed from plastic, glass, metal, composites, other suitable materials, or combinations of these materials.Driver circuitry 188 may be provided in the form of integrated circuits mounted onlayer 98 or mounted onlayer 100 ordriver circuitry 188 may be provided in the form of circuitry integrated onlayer 98 or on layer 100 (as examples). By usingbezel 178, internal device structures such ascircuitry 188 may be hidden from view from the exterior ofdevice 10. Adhesive such as adhesive 180 may be used to attachbezel 178 tohousing 26. Adhesive 182 may be used to attachdisplay structures 106 tohousing 26. - The foregoing is merely illustrative of the principles of this invention and various modifications can be made by those skilled in the art without departing from the scope and spirit of the invention.
Claims (27)
1-28. (canceled)
29. Apparatus, comprising:
a computer housing having a substantially rectangular recess with four edges; and
a substantially rectangular light guide panel disposed in the rectangular recess, wherein the light guide panel has four edges that are adjacent to the four edges of the rectangular recess without any intervening chassis structures.
30. The apparatus defined in claim 29 further comprising a clamp structure disposed over an edge of the light guide panel.
31. The apparatus defined in claim 30 , wherein the clamp structure comprises a sheet of metal.
32. The apparatus defined in claim 30 , wherein the clamp structure comprises a strip of stainless steel that is screwed into the computer housing.
33. The apparatus defined in claim 29 , wherein the light guide panel comprises at least one alignment tab and wherein the computer housing has at least one mating tab-shaped recess into which the alignment tab protrudes.
34. The apparatus defined in claim 33 , further comprising a reflective coating in the rectangular recess that reflects light back into the light guide panel.
35. The apparatus defined in claim 34 , wherein the reflective coating comprises white paint in the rectangular recess.
36. The apparatus defined in claim 33 , wherein the reflective coating comprises a layer of metal.
37. The apparatus defined in claim 29 , further comprising a white reflective sheet disposed between the light guide panel and the recess in the computer housing, wherein the white reflective sheet has portions that cover at least one of the edges of the light guide panel.
38. The apparatus defined in claim 29 , wherein the computer housing comprises machined aluminum.
39. The apparatus defined in claim 29 , further comprising: an array of light-emitting diodes that emit light into one of the four edges of the light guide panel.
40. The apparatus defined in claim 29 , further comprising:
a thin-film transistor glass layer; and
a color filter glass layer, wherein the thin-film transistor glass layer and the color filter glass layer are positioned above the rectangular recess and wherein light from the light guide panel passes through the thin-film glass layer and the color filter glass layer.
41. The apparatus defined in claim 29 , wherein the light guide panel comprises at least one alignment tab, wherein the computer housing has at least one mating tab-shaped recess into which the alignment tab protrudes, wherein the apparatus further comprises layers of optical films including a diffuser layer, and wherein the layers of optical films each include at least one alignment tab that protrudes into the tab-shaped recess in the computer housing.
42. The apparatus defined in claim 41 , further comprising a plastic reflective sheet under the light guide panel, wherein the plastic reflective sheet has bent edges that cover at least two of the edges of the light guide panel.
43. The apparatus defined in claim 29 , further comprising:
glass layers through which light from the light guide panel passes; and
a bezel that covers at least part of the glass layers.
44. The apparatus defined in claim 29 , further comprising: an array of light-emitting diodes that emit light into one of the edges of the light guide panel; a flex circuit on which the light-emitting diodes are mounted; and reflective tape that covers at least part of the flex circuit.
45. The apparatus defined in claim 44 , further comprising a sheet of reflective material under the light guide panel, wherein at least a portion of the sheet of reflective material covers the flex circuit.
46. A computer, comprising:
a housing having a base unit hingedly connected to a display housing, wherein the display housing comprises:
a machined rectangular recess having four recess edges and having alignment notches disposed along at least two of the four recess edges; and
a rectangular light guide panel having at least four light guide panel edges and having alignment tabs disposed along at least two of the four light guide panel edges;
wherein the alignment taps protrude into and mate with the alignment notches in the display housing.
47. The computer defined in claim 46 , further comprising a color filter glass layer through which light from the rectangular light guide panel passes.
48. The computer defined in claim 47 , further comprising a white reflective sheet with tabs that mate with the alignment notches.
49. The computer defined in claim 48 , further comprising at least one optical film layer on the light guide panel, wherein the at least one optical film layer includes a diffuser layer with tabs that mate with the alignment notches.
50. A method of forming a liquid-crystal display in an electronic device, comprising:
forming a rectangular recess in an electronic device housing, wherein the electronic device housing has an exterior surface that serves as an exterior for the electronic device and has an interior surface in which the rectangular recess is formed; and
placing individual layers of light guide structures directly into the rectangular recess without mounting the light guide structures in a chassis.
51. The method defined in claim 50 , wherein the rectangular recess and the light guide structures have respective mating recess alignment features and light guide structure alignment features and wherein placing the light guide structures directly into the rectangular recess comprises placing the light guide structures into the rectangular recess so that the recess alignment features mate with the light guide structure alignment features.
52. The method defined in claim 51 , wherein the light guide structures include at least one planar rectangular light guide panel, the method further comprising: attaching a clamp to the electronic device housing to hold the light guide structures in place within the recess.
53. The method defined in claim 52 , further comprising: inserting at least an edge of the light guide structures into an undercut groove in the metal electronic device housing.
54. The method defined in claim 52 , further comprising: holding light-emitting diodes under the clamp.
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CN102053677B (en) | 2016-04-06 |
CN202120156U (en) | 2012-01-18 |
WO2011056380A3 (en) | 2011-09-22 |
US20110103041A1 (en) | 2011-05-05 |
WO2011056380A2 (en) | 2011-05-12 |
TWI452460B (en) | 2014-09-11 |
TW201445294A (en) | 2014-12-01 |
TW201131340A (en) | 2011-09-16 |
CN103399615A (en) | 2013-11-20 |
US8408780B2 (en) | 2013-04-02 |
CN102053677A (en) | 2011-05-11 |
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