US20080101089A1 - Light guide plate and backlight module using same - Google Patents
Light guide plate and backlight module using same Download PDFInfo
- Publication number
- US20080101089A1 US20080101089A1 US11/608,640 US60864006A US2008101089A1 US 20080101089 A1 US20080101089 A1 US 20080101089A1 US 60864006 A US60864006 A US 60864006A US 2008101089 A1 US2008101089 A1 US 2008101089A1
- Authority
- US
- United States
- Prior art keywords
- light
- guide plate
- light guide
- backlight module
- emitting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/04—Optical design
- F21V7/05—Optical design plane
-
- 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
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
-
- 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
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0018—Redirecting means on the surface of the light guide
-
- 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
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
-
- 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
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
-
- 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]
-
- 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
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0083—Details of electrical connections of light sources to drivers, circuit boards, or the like
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S385/00—Optical waveguides
- Y10S385/901—Illuminating or display apparatus
Definitions
- the present invention relates to optical elements and light source devices and, more particularly, to a light guide plate and a backlight module using the same.
- LCD liquid crystal display
- TFT-LCD thin film transistors
- OLED organic light emitting diode
- a typical LCD device generally includes a backlight module to illuminate the LCD device.
- the backlight module is used to convert linear light sources such as cold cathode ray tubes, or point light sources such as light emitting diodes (LEDs), into area light sources having high uniformity and brightness.
- the LED is generally only a white LED or a single-color LED. However, this does not meet the requirement for colorful light sources for improving the LCD device.
- a light guide plate having a block body includes a bottom surface, a light emitting surface on an opposite side of the light guide plate to the bottom surface, at least three spaced light incident surfaces adjoining the bottom surface, and at least three fresnel lens portions provided on the respective at least three light incident surfaces of the block body.
- a backlight module in another preferred embodiment, includes a light guide plate having a block body and at least three light sources.
- the light guide plate having a block body includes a bottom surface, a light emitting surface on an opposite side of the light guide plate to the bottom surface, at least three spaced light incident surfaces adjoining the bottom surface, and at least three fresnel lens portions provided on the respective at least three light incident surfaces of the block body.
- Each of the light sources faces toward the respective three spaced light incident surfaces.
- FIG. 1 is an isometric view of a light guide plate according to a first preferred embodiment
- FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1 ;
- FIG. 3 is an enlarged view of a circled portion III shown in FIG. 2 ;
- FIG. 4 is a schematic sectional view of a light guide plate according to a second preferred embodiment
- FIG. 5 is a schematic sectional view of a backlight module according to a third preferred embodiment
- FIG. 6 is a schematic sectional view of a light emitting diode used in the preferred embodiments.
- FIG. 7 is a schematic sectional view of a backlight module according to a fourth preferred embodiment.
- the block body of the light guide plate 100 includes a bottom surface 102 , a light emitting surface 104 opposite to the bottom surface 102 , four spaced light incident surfaces 112 , four fresnel lens portions 114 and a plurality of side surfaces 106 .
- the light guide plate 100 having a block body is a transparent plate and may be manufactured by an injection molding process.
- a material of the light guide plate 100 is selected from the group consisting of poly-methyl-methacrylate (PMMA) resin, polycarbonate resin and polyethylene resin.
- the plurality of side surfaces 106 adjoins the bottom surface 102 and the light emitting surface 104 . Reflective films may be applied to the plurality of side surfaces 106 to make light beams reflected by the plurality of side surfaces 106 .
- a plurality of dots 108 are formed on the bottom surface 102 , and the plurality of dots 108 are integrated with the light guide plate 100 . Alternately, a plurality of V-shaped grooves may be formed on the bottom surface 102 .
- the four fresnel lens portions 114 are provided on the respective four spaced light incident surfaces 112 of the block body so as to couple light beams emitted from light sources (not shown) into the light guide plate 100 .
- the four spaced light incident surfaces 112 and the bottom surface 102 are located on a same plane.
- Each of the four fresnel lens portions 114 includes a plurality of concentric-annular grooves formed on the respective light incident surfaces 112 , as shown in FIG. 3 .
- a light guide plate 200 having a block body in accordance with a second preferred embodiment is shown. Difference between this preferred embodiment and the first preferred embodiment is that each of the four light incident surfaces 212 of this preferred embodiment obliquely interconnects the bottom surface 202 and the light emitting surface 204 . Light beams emitted from the light sources are diverted by the fresnel lens portions 214 provided on the respective light incident surfaces 212 into the light guide plate 200 , and exit from the light emitting surface 204 .
- the backlight module 300 includes four light sources 302 with the light guide plate 100 having a block body provided by the first preferred embodiment.
- Each of the light sources 302 faces toward its respective light incident surface 112 .
- Light beams emitted from the light sources 302 are diverted into the light guide plate 100 by the fresnel lens portions 114 .
- the dots 108 formed on the bottom surface 102 can totally eliminate internal reflection of the light beams, and make the light beams evenly exit from the light emitting surface 104 of the light guide plate 100 .
- the light sources 302 are formed integrally on a printed circuit board 304 .
- Each of the four light sources 302 are single-color LEDs.
- the four light sources 302 can include a white LED for emitting white light, a red LED for emitting red light, a green LED for emitting green light, a blue LED for emitting blue light.
- Light beams emitted from the four different-color light sources 302 are mixed in the light guide plate 100 and exit from the light emitting surface 104 .
- the exiting light beams with full-waveband of visible light are produced to ensure better color saturation and brightness of the backlight module 300 .
- each of the four light sources includes a surface-mount device LED 306 (SMD-LED) having a red LED chip 308 for emitting red light, a green LED chip 310 for emitting green light and a blue LED 312 chip for emitting blue light therein.
- SMD-LED surface-mount device LED 306
- the edge-type backlight module 400 includes a plurality of light sources 402 and a light guide plate 200 having a block body provided by the second preferred embodiment.
- the plurality of light sources 402 may be single-color LEDs or multi-color LEDs described in the third preferred embodiment.
Abstract
Description
- 1. Field of the Invention
- The present invention relates to optical elements and light source devices and, more particularly, to a light guide plate and a backlight module using the same.
- 2. Description of Related Art
- At present, colorful display devices are popular with cell phones and personal digital products. Various colorful display devices have been developed. Passive display devices, such as liquid crystal display (LCD) devices adopting thin film transistors (known as “TFT-LCD”), become a main aspect of the display market. However, with development of technology, active display devices, such as organic light emitting diode (OLED) display devices have started to reach the display market. Performance of LCD devices, such as color saturation and brightness, etc. therefore needs to be enhanced.
- As a passive device, a typical LCD device generally includes a backlight module to illuminate the LCD device. The backlight module is used to convert linear light sources such as cold cathode ray tubes, or point light sources such as light emitting diodes (LEDs), into area light sources having high uniformity and brightness.
- If LEDs are introduced as point light sources to the backlight module, the LED is generally only a white LED or a single-color LED. However, this does not meet the requirement for colorful light sources for improving the LCD device.
- What is needed, therefore, is a light guide plate and a backlight module for providing better color saturation and brightness.
- In one preferred embodiment of the present invention, a light guide plate having a block body includes a bottom surface, a light emitting surface on an opposite side of the light guide plate to the bottom surface, at least three spaced light incident surfaces adjoining the bottom surface, and at least three fresnel lens portions provided on the respective at least three light incident surfaces of the block body.
- In another preferred embodiment of the present invention, a backlight module includes a light guide plate having a block body and at least three light sources. The light guide plate having a block body includes a bottom surface, a light emitting surface on an opposite side of the light guide plate to the bottom surface, at least three spaced light incident surfaces adjoining the bottom surface, and at least three fresnel lens portions provided on the respective at least three light incident surfaces of the block body. Each of the light sources faces toward the respective three spaced light incident surfaces.
- Advantages and novel features will become more apparent from the following detailed description of the present light guide plate and its related backlight module, when taken in conjunction with the accompanying drawings.
- Many aspects of the present light guide plate and its related backlight module can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present light guide plate and its related backlight module. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
-
FIG. 1 is an isometric view of a light guide plate according to a first preferred embodiment; -
FIG. 2 is a cross-sectional view taken along line II-II ofFIG. 1 ; -
FIG. 3 is an enlarged view of a circled portion III shown inFIG. 2 ; -
FIG. 4 is a schematic sectional view of a light guide plate according to a second preferred embodiment; -
FIG. 5 is a schematic sectional view of a backlight module according to a third preferred embodiment; -
FIG. 6 is a schematic sectional view of a light emitting diode used in the preferred embodiments; and -
FIG. 7 is a schematic sectional view of a backlight module according to a fourth preferred embodiment. - Corresponding reference characters indicate corresponding parts throughout the drawings. The exemplifications set out herein illustrate at least one preferred embodiment of the present light guide plate and its related backlight module, in one form, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
- Reference will now be made to the drawings to describe preferred embodiments of the light guide plate and its related backlight module.
- Referring to
FIGS. 1 to 3 , alight guide plate 100 having a block body in accordance with a first preferred embodiment is shown. The block body of thelight guide plate 100 includes abottom surface 102, alight emitting surface 104 opposite to thebottom surface 102, four spacedlight incident surfaces 112, fourfresnel lens portions 114 and a plurality ofside surfaces 106. - The
light guide plate 100 having a block body is a transparent plate and may be manufactured by an injection molding process. A material of thelight guide plate 100 is selected from the group consisting of poly-methyl-methacrylate (PMMA) resin, polycarbonate resin and polyethylene resin. - The plurality of
side surfaces 106 adjoins thebottom surface 102 and thelight emitting surface 104. Reflective films may be applied to the plurality ofside surfaces 106 to make light beams reflected by the plurality ofside surfaces 106. A plurality ofdots 108 are formed on thebottom surface 102, and the plurality ofdots 108 are integrated with thelight guide plate 100. Alternately, a plurality of V-shaped grooves may be formed on thebottom surface 102. - The four
fresnel lens portions 114 are provided on the respective four spacedlight incident surfaces 112 of the block body so as to couple light beams emitted from light sources (not shown) into thelight guide plate 100. In this preferred embodiment, the four spacedlight incident surfaces 112 and thebottom surface 102 are located on a same plane. Each of the fourfresnel lens portions 114 includes a plurality of concentric-annular grooves formed on the respectivelight incident surfaces 112, as shown inFIG. 3 . - Referring to
FIG. 4 , alight guide plate 200 having a block body in accordance with a second preferred embodiment is shown. Difference between this preferred embodiment and the first preferred embodiment is that each of the fourlight incident surfaces 212 of this preferred embodiment obliquely interconnects thebottom surface 202 and thelight emitting surface 204. Light beams emitted from the light sources are diverted by thefresnel lens portions 214 provided on the respectivelight incident surfaces 212 into thelight guide plate 200, and exit from thelight emitting surface 204. - Referring to
FIG. 5 , a direct-type backlight module 300 in accordance with a third preferred embodiment is shown. Thebacklight module 300 includes fourlight sources 302 with thelight guide plate 100 having a block body provided by the first preferred embodiment. - Each of the
light sources 302 faces toward its respectivelight incident surface 112. Light beams emitted from thelight sources 302 are diverted into thelight guide plate 100 by thefresnel lens portions 114. Thedots 108 formed on thebottom surface 102 can totally eliminate internal reflection of the light beams, and make the light beams evenly exit from thelight emitting surface 104 of thelight guide plate 100. Preferably, thelight sources 302 are formed integrally on a printedcircuit board 304. - Each of the four
light sources 302 are single-color LEDs. For example, the fourlight sources 302 can include a white LED for emitting white light, a red LED for emitting red light, a green LED for emitting green light, a blue LED for emitting blue light. Light beams emitted from the four different-color light sources 302 are mixed in thelight guide plate 100 and exit from thelight emitting surface 104. The exiting light beams with full-waveband of visible light are produced to ensure better color saturation and brightness of thebacklight module 300. - Besides, alternately the four light sources may use multi-color LEDs. For example, referring to
FIG. 6 , each of the four light sources includes a surface-mount device LED 306 (SMD-LED) having ared LED chip 308 for emitting red light, agreen LED chip 310 for emitting green light and ablue LED 312 chip for emitting blue light therein. - Referring to
FIG. 7 , an edge-type backlight module 400 in accordance with a fourth preferred embodiment is shown. The edge-type backlight module 400 includes a plurality oflight sources 402 and alight guide plate 200 having a block body provided by the second preferred embodiment. The plurality oflight sources 402 may be single-color LEDs or multi-color LEDs described in the third preferred embodiment. - Since light incident surfaces 112, 212 provided with the
fresnel lens portions light guide plate light guide plate light guide plate light emitting surface backlight module - It is to be understood that the above-described embodiment is intended to illustrate rather than limit the invention. Variations may be made to the embodiment without departing from the spirit of the invention as claimed. The above-described embodiments are intended to illustrate the scope of the invention and not restrict the scope of the invention.
Claims (14)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200610063339.1 | 2006-10-27 | ||
CNA2006100633391A CN101169495A (en) | 2006-10-27 | 2006-10-27 | Light conducting board and backlight module |
Publications (2)
Publication Number | Publication Date |
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US20080101089A1 true US20080101089A1 (en) | 2008-05-01 |
US7367704B1 US7367704B1 (en) | 2008-05-06 |
Family
ID=39329879
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/608,640 Expired - Fee Related US7367704B1 (en) | 2006-10-27 | 2006-12-08 | Light guide plate and backlight module using same |
Country Status (2)
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US (1) | US7367704B1 (en) |
CN (1) | CN101169495A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070152135A1 (en) * | 2005-12-21 | 2007-07-05 | Saburo Watanabe | Planar illumination device and liquid crystal display device using the planar illumination device as a backlight |
US20130286686A1 (en) * | 2010-11-30 | 2013-10-31 | Heptagon Micro Optics Pte. Ltd. | Optical Light Guide Element For An Electronic Device |
US20140240960A1 (en) * | 2013-02-27 | 2014-08-28 | Hewlett-Packard Development Company, L.P. | Display having a backplane with an edge surface that makes an angle with the top surface |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7517105B2 (en) * | 2006-01-06 | 2009-04-14 | Asagicreate Co., Ltd. | Surface light source and electrically illuminated signboard |
TWI470508B (en) | 2009-08-12 | 2015-01-21 | Au Optronics Corp | Touch panel and touch display device having the same |
CN101667084B (en) * | 2009-08-24 | 2014-07-23 | 友达光电股份有限公司 | Touch panel and touch display device provided with touch panel |
US8651725B2 (en) * | 2010-09-30 | 2014-02-18 | Global Lighting Technology Inc. | Backlight module |
CN102494284A (en) * | 2011-12-21 | 2012-06-13 | 南京中电熊猫液晶显示科技有限公司 | Lateral illumination type backlight module capable of improving LED (light emitting diode) luminous efficiency |
CN102691936A (en) * | 2012-05-22 | 2012-09-26 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display device |
TW201426125A (en) * | 2012-12-26 | 2014-07-01 | Young Lighting Technology Inc | Light guide plate and backlight module |
US9459396B1 (en) | 2013-10-04 | 2016-10-04 | Universal Lighting Technologies, Inc. | Linear indirect LED lighting system |
CN108663742A (en) * | 2017-08-16 | 2018-10-16 | 维沃移动通信有限公司 | A kind of leaded light component and mobile terminal |
CN110602293A (en) * | 2018-06-12 | 2019-12-20 | Oppo广东移动通信有限公司 | Shell assembly and electronic device |
CN108761919B (en) * | 2018-07-13 | 2023-10-31 | 安徽芯瑞达科技股份有限公司 | High-efficiency backlight module |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US6305813B1 (en) * | 1999-08-11 | 2001-10-23 | North American Lighting, Inc. | Display device using a light guide for exterior automotive lighting |
US6623132B2 (en) * | 1999-08-11 | 2003-09-23 | North American Lighting, Inc. | Light coupler hingedly attached to a light guide for automotive lighting |
US20060139953A1 (en) * | 2004-12-24 | 2006-06-29 | Prodisc Technology Inc. | Liquid crystal display and backlight module thereof |
-
2006
- 2006-10-27 CN CNA2006100633391A patent/CN101169495A/en active Pending
- 2006-12-08 US US11/608,640 patent/US7367704B1/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US6305813B1 (en) * | 1999-08-11 | 2001-10-23 | North American Lighting, Inc. | Display device using a light guide for exterior automotive lighting |
US6623132B2 (en) * | 1999-08-11 | 2003-09-23 | North American Lighting, Inc. | Light coupler hingedly attached to a light guide for automotive lighting |
US20060139953A1 (en) * | 2004-12-24 | 2006-06-29 | Prodisc Technology Inc. | Liquid crystal display and backlight module thereof |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070152135A1 (en) * | 2005-12-21 | 2007-07-05 | Saburo Watanabe | Planar illumination device and liquid crystal display device using the planar illumination device as a backlight |
US7837375B2 (en) * | 2005-12-21 | 2010-11-23 | Hitachi Displays, Ltd. | Planar illumination device and liquid crystal display device using the planar illumination device as a backlight |
US20130286686A1 (en) * | 2010-11-30 | 2013-10-31 | Heptagon Micro Optics Pte. Ltd. | Optical Light Guide Element For An Electronic Device |
US20140240960A1 (en) * | 2013-02-27 | 2014-08-28 | Hewlett-Packard Development Company, L.P. | Display having a backplane with an edge surface that makes an angle with the top surface |
Also Published As
Publication number | Publication date |
---|---|
CN101169495A (en) | 2008-04-30 |
US7367704B1 (en) | 2008-05-06 |
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