Light Modifier For Edge Lit Light Source (incident Edge) Patents (Class 362/608)
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Patent number: 7810978Abstract: A spread illuminating apparatus includes: a light conductor plate having a light inlet surface and a light outlet surface; a point light source disposed at the light inlet surface of the light conductor plate; and a light diffuser sheet disposed on the light outlet surface of the light conductor plate, wherein the light diffuser sheet has one end thereof extending beyond the light inlet surface and thereby covers at least a part of the point light source, whereby light which conventionally does not enter the light conductor plate directly from the light inlet surface is adapted to impinge on the light diffuser sheet and to fall incident on the light inlet surface and is efficiently utilized. A recess may be formed at the one end of the light diffuser sheet so as to expose a part of the light exit surface of the light conductor plate.Type: GrantFiled: December 20, 2007Date of Patent: October 12, 2010Assignee: Minebea Co., Ltd.Inventor: Yasuo Ohno
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Publication number: 20100254159Abstract: A brightness enhancement film (BEF) including a first surface, a second surface, and a side surface is provided. The first surface is a curved surface continuously fluctuant in two dimensions and includes a plurality of axisymmetric convex surfaces and a plurality of non-axisymmetric concave surfaces. Each of the axisymmetric convex surfaces is a curved surface. The axisymmetric convex surfaces and the non-axisymmetric concave surfaces are arranged alternately in the two dimensions and respectively form a plurality of wave crests and a plurality of wave troughs. Each of the non-axisymmetric concave surfaces is a curved surface. The second surface is opposite to the first surface and the side surface connects the first surface and the second surface. In addition, a backlight module employing the BEF is also provided.Type: ApplicationFiled: December 4, 2009Publication date: October 7, 2010Applicant: CORETRONIC CORPORATIONInventors: Tun-Chien Teng, Chih-Jen Tsang, Neng-Jung Tseng
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Publication number: 20100238685Abstract: A display including a display panel and a backlight module adjacent to the display penal is provided. The backlight module includes a light source emitting a light beam and at least one light diffraction member. The light diffraction member includes a first surface, a second surface, an azimuth convergence structure and a light diffraction structure. The second surface is opposite the first surface, and the light beam enters the light diffraction member through the second surface and leaves the light diffraction member from the first surface. The azimuth convergence structure is disposed on the second surface for converging the azimuth of the light beam incident thereon. The light diffraction structure is disposed on the first surface for adjusting the emergence angle of the light beam.Type: ApplicationFiled: March 17, 2010Publication date: September 23, 2010Inventors: Kuo-Jui Huang, Zhi-Ting Ye
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Publication number: 20100238529Abstract: A reflective or transmissive hologram may be used to extract light from a waveguide. The hologram may be formed by separately exposing each of a plurality of areas of a holographic medium with object beams and/or reference beams having attributes (e.g., illumination angles) that vary randomly or pseudorandomly over the entire hologram. The areas may be contiguous (e.g., in a tiled pattern) or overlapping. In some embodiments, the spacing and/or orientation of the diffraction gratings may vary from area to area. For example, the spacing and/or orientation of the diffraction gratings may vary randomly or pseudorandomly from area to area. Some parts of the hologram may intentionally be made relatively more or relatively less efficient at extracting light from the waveguide.Type: ApplicationFiled: March 23, 2009Publication date: September 23, 2010Inventors: JEFFREY BRIAN SAMPSELL, MAREK MIENKO
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Patent number: 7798696Abstract: An illumination device for a liquid crystal display (LCD) is provided, including: a flat light guide plate having a light exit surface; at least one linear source unit integrally formed with a side of the flat light guide plate and extending along the at least one side of the flat light guide plate; one or more point light sources emitting light through at least one of the side surfaces of the linear light source unit; and a plurality of light exit holes vertically passing through the flat light guide plate and arranged in a longitudinal direction of the linear light source unit between the light exit surface of the flat light guide plate and the linear light source unit, wherein each of the light exit holes has a reflective surface that totally reflects light incident on the linear light source unit into the flat light guide plate.Type: GrantFiled: April 11, 2007Date of Patent: September 21, 2010Assignee: Samsung Electronics Co., Ltd.Inventors: Hong-seok Lee, Su-mi Lee, Hwan-Young Choi
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Patent number: 7791684Abstract: An optical device for backlighting a liquid crystal display. The optical device has an optical element. The optical element includes a material body and at least one recess. The recess is formed in the material body and is configured to determine the light distribution of light to be directed towards the liquid crystal display.Type: GrantFiled: February 12, 2008Date of Patent: September 7, 2010Assignee: SONY Deutschland GmbHInventors: Juan Manuel Teijido, Olivier Ripoll, Nadin Roesler, Takeo Arai
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Publication number: 20100220256Abstract: A backlight unit and liquid crystal display device comprising the backlight unit is disclosed. A backlight unit comprises a light source, an optical sheet where light from the light source is incident, a frame surrounding an edge portion of the optical sheet; and at least one sheet holder disposed at a bottom part of the frame facing the optical sheet.Type: ApplicationFiled: December 27, 2007Publication date: September 2, 2010Inventor: Bongtaek Hong
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Publication number: 20100214507Abstract: Disclosed are a backlight unit capable of guiding light generated by LEDs to a light guide panel in order to eliminate brightness fault, as well as a light crystal display including the same. The backlight unit includes a light guide panel, an LED arranged at a lateral side of the light guide panel, and a light guide bar with at least one light diffusion pattern to scatter light generated by the LED and admit the scattered light into the light guide panel, thereby uniformly guiding the light generated by the LED to the light guide panel.Type: ApplicationFiled: February 4, 2010Publication date: August 26, 2010Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jae Heon Noh, Dong Seob Jang, Chang Hyun Kim
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Patent number: 7780330Abstract: A solid waveguide comprises opposite TIR surfaces further comprising: a) at least one light input surface for coupling light from a solid state light source; b) at least one mixing section; c) at least one light emitting surface; and d) a desired pattern of light redirecting features located on one TIR surface or between the TIR surfaces.Type: GrantFiled: May 16, 2007Date of Patent: August 24, 2010Assignee: Rohm and Haas Electronics Materials LLCInventors: Peter T. Aylward, Robert P. Bourdelais, Qi Hong, John M. Palmeri, Leonard S. Gates
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Publication number: 20100195349Abstract: An apparatus and method for a light source are disclosed. The apparatus comprises a light guide including light extracting features and at least one light source placed near an end of the light guide. Light from the light source gets deflected by the light extracting features and emanates in a predetermined pattern along a surface of the light guide. The light guide has different thicknesses in different parts.Type: ApplicationFiled: July 5, 2008Publication date: August 5, 2010Applicant: I2IC CORPORATIONInventors: Udayan Kanade, Gaurav Kulkarni, Karthikk Sridharan, Manas Alekar, Manohar Joshi, Sanat Ganu, Balaji Ganapathy
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Patent number: 7762703Abstract: A heads-up display comprises a monochrome display device for generating an image and an optical device for generating a virtual image from the image of the display device. The monochrome display device comprises a display and a backlight for illuminating the display from its backside. The backlight comprises a first light source emitting light of a first color, a second light source emitting light of a second color, a first light guide coupled to the first light source, and a second light guide coupled to the second light source. The first and second light guides are disposed in such close juxtaposition behind the display so that they illuminate together the entire backside of the display and illuminate a first region of the display associated with the first light guide with the first color and a second region of the display associated with the second light guide with the second color.Type: GrantFiled: March 2, 2007Date of Patent: July 27, 2010Assignee: GM Global Technology Operations, Inc.Inventors: Aiko Böhme, Peter Brandt, Heiko Charle
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Publication number: 20100182529Abstract: A mount structure includes a wiring board and a semiconductor device composed of a light-emitting device or a light-receiving device mounted on one surface side of the wiring board such that an optical axis thereof is oriented in a direction that extends along a board surface of the wiring board. On the one surface side of the wiring board, a first pad on which a first terminal of the semiconductor device is mounted, a second pad on which a second terminal of the semiconductor device is mounted, and a light-shielding conductive layer are formed using the same conductive layer. The first pad and the second pad are arranged on respective sides of an imaginary center line along which the optical axis of the semiconductor device extends and the light-shielding conductive layer is provided at a position beneath a light emission center or a light reception center of the semiconductor device in plan view.Type: ApplicationFiled: December 28, 2009Publication date: July 22, 2010Applicant: EPSON IMAGING DEVICES CORPORATIONInventor: Daisuke NAKANISHI
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Patent number: 7758229Abstract: The present invention relates to a light source assembly and a backlight module including the same. The light source assembly (10) includes a light source (12) and a light guide plate (16). The light source (12) includes a light-emitting layer (122). The light source assembly (10) further includes a transparent filling layer (14) is interposed between the light source (12) and the light guide plate (16). The light source assembly (10) can reduce reflection and refraction loss when the light beam enters the light guide plate (16).Type: GrantFiled: January 10, 2008Date of Patent: July 20, 2010Assignee: Foxsemicon Integrated Technology, Inc.Inventor: Yuan-Fa Chu
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Publication number: 20100172151Abstract: Light emitting assembly includes an optical conductor having a pattern of deformities on or in front and back sides of the optical conductor to cause light to be emitted from a light emitting surface on at least one of the sides. At least one of the deformities varies, and at least one planar or curved refractive surface is aligned with at least one light source to redirect a portion of the light from the light source entering the optical conductor in a predetermined manner to cause the light emitted from the light emitting surface to pass through an optical film, which redirects the light through a liquid crystal display with low loss.Type: ApplicationFiled: March 15, 2010Publication date: July 8, 2010Inventor: Jeffery R. Parker
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Patent number: 7740387Abstract: A backlight may include a light guide and a light input. The light guide may have a light reflection surface and a light emission surface. The light input may include a diverging wedge having a narrow end and opposing side surfaces extending to the narrow end. A light source may be disposed adjacent to one of the opposing side surfaces and may emit light into the light input portion. A multilayer polymeric mirror film may be disposed adjacent to the opposing side surfaces but not in intimate contact therewith and may reflect more than 95% of visible light incident on the multilayer polymeric mirror film.Type: GrantFiled: May 24, 2006Date of Patent: June 22, 2010Assignee: 3M Innovative Properties CompanyInventors: John C. Schultz, Jacob Moskovich, William J. Bryan, Michael A. Meis
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Patent number: 7731410Abstract: A light-emitting module includes a light guiding body, a light-emitting unit and a fluorescent unit. The light-guiding unit has a groove. The light-emitting unit is disposed in a portion of the groove and emits a first light. The fluorescent unit is disposed in a remaining portion of the groove, receives the first light and emits a second light having a different wavelength range than the first light. The fluorescent unit emits the second light to an inner side surface of the groove. Therefore, loss of the first and second light is reduced and light-using efficiency of the light-emitting module is increased. Furthermore, a power consumption of a display device is significantly reduced.Type: GrantFiled: August 29, 2006Date of Patent: June 8, 2010Assignee: Samsung Electronics Co., LtdInventor: Young-Bee Chu
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Publication number: 20100134722Abstract: A backlight module includes: a light guide plate including a light-entering surface; a light source module disposed beside the light-entering surface; and a reflector including an opening adjacent to the light-entering surface. The light source module is disposed in the reflector and emits light toward the light-entering surface through the opening. A height of the opening is less than a thickness of the light guide plate.Type: ApplicationFiled: December 2, 2009Publication date: June 3, 2010Applicant: CHI MEI OPTOELECTRONICS CORP.Inventors: Kun-Feng HUANG, Mei-Ying CHEN, Kuan-Li LIN
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Publication number: 20100110725Abstract: A light guide plate (LGP) including a first surface, a second surface, a light incident surface and a plurality of optical micro-structures is provided. The first surface is opposite to the second surface. The light incident surface connects the first surface and the second surface. The optical micro-structures are disposed on the second surface and include a plurality of round protrusive points and a plurality of curved protrusions. The curved protrusions are disposed among the round protrusive points. Each of the curved protrusions has a first arc side and a second arc side opposite to the first arc side, and an indentation of the first arc side and an indentation of the second arc side are substantially towards a same direction. In addition, a backlight module employing the above-mentioned LGP is also provided.Type: ApplicationFiled: June 15, 2009Publication date: May 6, 2010Applicant: CORETRONIC CORPORATIONInventor: Liang-Kang Chang
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Publication number: 20100110726Abstract: A backlight module includes at least one light emitting element capable of emitting a light beam and a light diffusion brightness enhancement film. The brightness enhancement film includes a light transmissive substrate, a plurality of prism rods, and at least one light diffusion structure. The light transmissive substrate has a first and a second surfaces opposite to each other. The first and the second surfaces are disposed in a transmission path of the light beam. The first surface is disposed between the light emitting element and the second surface. Each of the prism rod extends along a first direction. The prism rods are disposed on the first surface and are arranged along a second direction. The light diffusion structure is disposed on the first surface and between the two adjacent prism rods, and has a rough surface. The light diffusion structure and the rough surface extend along the first direction.Type: ApplicationFiled: October 21, 2009Publication date: May 6, 2010Applicant: Nano Precision CorporationInventor: Hao-Jan Kuo
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Patent number: 7708442Abstract: Devices and assemblies for providing light to a display panel, including methods of attaching such devices and assemblies to a circuit board, are disclosed. An illustrative device can include a light emitting panel including at least one light interface for receiving light from a light source. The light interface may define an aperture adapted to receive a portion of the light source, forming an air gap between the light source and interface. A number of centering ribs and/or beveled sections can be used to align the light source within the aperture during assembly of the device to a circuit board.Type: GrantFiled: October 25, 2006Date of Patent: May 4, 2010Assignee: Honeywell International Inc.Inventor: Jason L. Ableitner
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Patent number: 7708444Abstract: A primary object of the present invention is to provide a surface light source device attaining a homogenous luminance distribution on a light emitting surface of a light guiding plate in which a dot light source having a high directivity of emitted light is employed. The device includes: a light guiding plate 5 including a plurality of primary holes in such a manner as to locate each dot light source 3 inside; and dot printing 7a being employed as an auxiliary light source means which diffuses light from the dot light source 3 to the position between dot light sources 3 being adjacent to each other, wherein the dot printing 7 is provided at a base of the light guiding plate 5 and a middle point of the connected dot light sources 3 being adjacent to each other.Type: GrantFiled: January 12, 2005Date of Patent: May 4, 2010Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Seiji Sakai, Takuya Sakamoto, Toshiyuki Yoneda
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Patent number: 7708445Abstract: A light guide device (21) includes an incident surface (211), an emitting surface (212) and a plurality of protrusions (212a). The incident surface is configured so as to allow an incident light to pass therethrough. The emitting surface is adjoining the incident surface and configured so as to allow the light to emit out of the light guide device. The protrusions are formed on at least a portion of the emitting surface. The protrusions are configured for concentrating light that emits out from said portion of the emitting surface. The present application is also concerned to a backlight module (2) including a light source (22) and the light guide device.Type: GrantFiled: August 10, 2006Date of Patent: May 4, 2010Assignee: Hon Hai Precision Industry Co., Ltd.Inventor: Ming-Yi Liao
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Publication number: 20100103696Abstract: Described is an optical waveguide having a main direction of extension, at least one radiation entrance face, and a radiation exit face that extends longitudinally to the main direction of extension, wherein at least one radiation entrance face extends transversely to the main direction of extension, and the at least one radiation entrance face has two convexly curved subregions that are connected to each other by a kink-like or concavely shaped indentation. An optical device formed with such a waveguide is also described, as is a display device.Type: ApplicationFiled: September 21, 2007Publication date: April 29, 2010Inventors: Josef Huttner, Julius Muschaweck, Georg Bogner
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Patent number: 7705365Abstract: A light emitting module of a lighting device has a casing, a heat radiating member and terminals. The terminals extend from the casing and connects to a circuit board disposed along a light diffusing member. The heat radiating member extends in a direction perpendicular to the terminals. Alternatively, the terminals are connected to heat radiating lands formed on a second circuit board that is provided separately from a first circuit board and the heat radiating member is connected to a heat radiating land formed on the second circuit board. Further, the heat radiating member can be connected to a heat radiating plate overlapping with the second circuit board, in place of the heat radiating land.Type: GrantFiled: January 23, 2007Date of Patent: April 27, 2010Assignee: Denso CorporationInventors: Kazumasa Kurokawa, Yosimi Kondo
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Publication number: 20100097824Abstract: A direct type backlight unit 1 comprising a light source 13, a diffusing plate 14 disposed over the light source, and an optical member 15 disposed on the diffusing plate, or an edge light type backlight unit comprising a light conducting plate and an optical member disposed on the light conducting plate, wherein the surface of the optical member 15 contacting with the diffusing plate or the light conducting plate (henceforth referred to as optical element) is formed from a material containing a thermosetting resin and/or a thermoplastic resin, and polyethylene type wax particles having a mean particle diameter of 4 to 10 ?m. The content of the polyethylene type wax particles is 0.20 to 0.50 part by weight based on 100 parts by weight of resin component of the resin layer.Type: ApplicationFiled: March 19, 2008Publication date: April 22, 2010Applicant: KIMOTO CO., LTD.Inventors: Yohei Funabashi, Yasumaro Toshima
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Publication number: 20100091519Abstract: The invention relates to an illumination system (30) for illuminating a display (20) of a display device (10), and to a display device. The illumination system comprises a light source (S1, S2, S3) and an optical control layer (40). The light source emits light via the optical control layer to the display for illuminating a predefined area (A1, A2, A3) on the display. The light is emitted from the light source in a diverging beam in a particular direction (O1, O2, O3) towards the predefined area. The optical control layer comprises an arrangement of portions (46) having a refractive index which is different from the optical control layer. The portions are arranged to reflect a part of the diverging light towards the predefined area. The measures according to the invention have the effect that the arrangement of portions in the optical control layer confines both the light emitted by the light source and the backscattered light reflected back to the light source to substantially within the predefined area.Type: ApplicationFiled: February 20, 2008Publication date: April 15, 2010Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventors: Fetze Pijlman, Giovanni Cennini
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Patent number: 7686497Abstract: A light guide and module for motor vehicles that directs light generally along a horizontal axis. The module includes an array of light sources, an array of reflectors and a light guide. The light guide defines a body having opposed upper and lower walls. Formed in the lower wall is at least one prismatic structure having a reflecting surface oriented to reflect light based the principle of total internal reflection and to redirect light toward the upper wall. Formed in the upper wall is at least one decoupling prism element. The decoupling prism elements corresponding in number to the prismatic structures and are located in the upper wall so as to receive redirected light from its corresponding prismatic structures. The decoupling prism element includes a second reflecting surface that reflects light redirected from the first reflecting surface.Type: GrantFiled: May 15, 2007Date of Patent: March 30, 2010Assignee: Visteon Global Technologies, Inc.Inventors: Miroslav Kropac, Jan Martoch
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Publication number: 20100061115Abstract: A one-way see-through illumination system is constructed from a light guide panel, a front-illuminable image film, and a light injector. The light injector injects light into the light guide panel at a suitable angle for total internal reflection of the injected light at the surfaces of the light guide panel. The image film includes a half-toned front-illuminable image pattern that extracts light from the light guide panel. When active, light from the light guide panel front illuminates the image pattern for viewing by a front-side view, while a back-side viewer can see through the image pattern.Type: ApplicationFiled: April 6, 2009Publication date: March 11, 2010Applicant: DONAHUE INVENTIONS LLCInventor: Kevin G. Donahue
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Patent number: 7674029Abstract: A light guide device and a light guide plate using the same are provided. The light guide device has a first surface, a second surface, and a bottom surface. The first surface, the second surface, and the bottom surface define the internal part of the light guide device. The bottom surface has a cavity. When a light source in the cavity generates light, the light from the internal part of the light guide device is emitted via the first surface.Type: GrantFiled: July 25, 2007Date of Patent: March 9, 2010Assignee: Lite-On Technology CorporationInventors: Yu-Nan Liu, Tzu-Wei Wang
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Publication number: 20100046247Abstract: A light guide device is provided in an embodiment of the invention. The light guide device comprises a light guide plate and a light source provided on a side surface of the light guide plate. A light guide strip is provided on a side surface of the light guide plate intersecting with the side surface provided with the light source. A side surface of the light guide strip facing the light guide plate is a light exit surface of the light guide strip, a side surface of the light guide strip opposite to the light exit surface is a reflective surface of the light guide strip, and an end surface of the light guide strip adjacent to the light source is a light entrance surface of the light guide strip.Type: ApplicationFiled: August 17, 2009Publication date: February 25, 2010Inventors: Haijun LIU, Dae Keun YOON
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Publication number: 20100045894Abstract: Laser lights emitted from a light source 30 are diffused in a direction parallel to main surfaces of a light guide plate 9 by a one-dimensional diffuser 5. The diffused laser lights are converted to parallel lights by a first cylindrical lens 6, and are then converged in a direction of the thickness of the light guide plate 9 by a second cylindrical lens 7. The converged laser lights are reflected 90 degrees twice by a mirror 8, and are guided to a side surface of the light guide plate 9.Type: ApplicationFiled: September 25, 2007Publication date: February 25, 2010Inventors: Tatsuo Itoh, Takayuki Nagata, Tetsuro Mizushima, Kazuhisa Yamamoto
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Patent number: 7665877Abstract: A prism sheet capable of enhancing light efficiency and viewing angle characteristics, a backlight unit using the prism sheet, and a method for fabricating the prism sheet are disclosed. The prism sheet includes a transparent substrate, a plurality of grooves formed in an upper surface of the transparent substrate to extend in a parallel direction with each other and to be uniformly spaced apart from one another by a predetermined distance, a plurality of reflection patterns respectively formed in the grooves, and a plurality of lenticular lenses formed on the upper surface of the transparent substrate formed with the reflection patterns.Type: GrantFiled: December 22, 2005Date of Patent: February 23, 2010Assignee: LG Display Co., Ltd.Inventors: Man Hoan Lee, Ji Su Yoon, Sung Keun Lee
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Publication number: 20100039586Abstract: An optical element capable of increasing an angular field while improving luminance by condensing light, and a backlight unit and a liquid crystal display including the same. The optical element includes a light-transmitting base film; a plurality of diffusing cavities or convex diffusing structures formed in one surface of the base film to diffuse light entering the base film; and a light-condensing pattern formed in the surface of the base film where the diffusing cavities or convex diffusing structures are formed so as to condense incident light.Type: ApplicationFiled: August 7, 2009Publication date: February 18, 2010Applicant: LMS CO., LTDInventors: JEONG-HO PARK, YOUNG-SOO DO, OH-HYUN KWON
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Patent number: 7661865Abstract: To provide a liquid crystal display backlight and a liquid crystal display device, which can improve the heat dissipating effect, can reduce the thickness and weight of the device. The liquid crystal display backlight includes: an emission light guide plate for emitting illuminating light for a liquid crystal display panel from one face; one and other mixed-color light guides mounted on a same plane of other face of the emission light guide plate via a spacer; a heat-dissipating spatial area provided between the mixed-color light guide plates; light-emitting devices disposed within the heat-dissipating spatial area; and reflectors for guiding output light, propagated inside each mixed-color light guide plate, towards corresponding end faces of the emission light guide plate from outside end face of each mixed-color light guide plate. A holding plate for holding the light-emitting devices is provided, facing each mixed-color light guide plate with an airing gap provided therebetween.Type: GrantFiled: October 17, 2008Date of Patent: February 16, 2010Assignee: NEC LCD Technologies, Ltd.Inventor: Masatake Baba
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Patent number: 7661868Abstract: A diffuser sheet which compensates for chromatic dispersion generated in a hologram light guide plate, and an illumination apparatus employing the diffuser sheet are provided. The diffuser sheet includes a plate type light-transmissive substrate and a light diffusion layer disposed on a light emission surface of the light-emission substrate. A light-incident surface of the light-transmissive substrate has declined surfaces and flat surfaces which are alternatively and repeatedly formed thereon. The declined surfaces are declined at a predetermined angle.Type: GrantFiled: March 27, 2006Date of Patent: February 16, 2010Assignee: Samsung Electro-Mechanics Co., LtdInventors: Jin-hwan Kim, Jin-Seung Choi, Jee-hong Min, Jae-ho You, Su-mi Lee, Yoon-sun Choi
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Patent number: 7654681Abstract: A surface light source device using light emitting diodes, the device including: a housing having a top opening to emit light; a light emitting diode board disposed on an inner bottom surface of the housing, the board on which a plurality of light emitting diodes are arranged; and a color conversion laminate formed by depositing a plurality of phosphor-mixed resin layers containing phosphors, the layers disposed at a top of the opening of the housing and providing light having different wavelengths.Type: GrantFiled: September 6, 2007Date of Patent: February 2, 2010Assignee: Samsung Electro-Mechanics Co., Ltd.Inventors: Yong Tae Kim, Min Sang Lee, Dong Yeoul Lee
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Publication number: 20100014314Abstract: A conventional light diffusion plate provided in a direct type backlight unit to be employed for e.g. a liquid crystal display, has problems in that it does not have a sufficient diffusion performance, it is difficult to increase the size, and it is difficult to produce such a light diffusion plate at low cost. A light diffusion plate comprising a glass substrate and a light diffusion layer formed on the glass substrate, wherein the light diffusion layer comprises a matrix and a light diffusion agent, the absolute value ?n of the refractive index difference between the matrix and the light diffusion agent is 0.05 or more and less than 0.5, and the volume ratio of the light diffusion agent in the light diffusion layer is 30% or more.Type: ApplicationFiled: July 16, 2009Publication date: January 21, 2010Applicant: ASAHI GLASS COMPANY, LIMITEDInventors: Hisao Inokuma, Satoru Takaki
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Patent number: 7645048Abstract: The planar lighting device includes a light source having at least one LED chip for emitting blue light through a light emission face, a transparent light guide plate having at least one light entrance plane through which light emitted by the light source is admitted and a light exit plane through which the light admitted through the at least one light entrance plane is emitted as planar light, and a fluorescent member disposed between the light emission face and each of the at least one light entrance plane and having a fluorescent substance coated area for emitting white light by converting the blue light from the light source into the white light and blue light passing areas through which the blue light from the light source is allowed to pass as the blue light.Type: GrantFiled: November 15, 2007Date of Patent: January 12, 2010Assignee: FUJIFILM CorporationInventors: Osamu Iwasaki, Takamitsu Okumura, Toshiaki Endo
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Patent number: 7641374Abstract: A backlight module includes a light source and a light guide plate. The light guide plate includes a light-receiving surface next to a light source, a light-emitting surface, and a light-reflecting surface oppose to the light-emitting surface. A plurality of notches are formed on the light-reflecting surface, and each notch has a first inner surface facing the light source and a second inner surface back to the light source and opposite to the first inner surface. The inclination angle of the first inner surface with respect to the light-reflecting surface is no more than 35 degrees.Type: GrantFiled: May 23, 2007Date of Patent: January 5, 2010Assignee: Wintek CorporationInventors: Ping-Yeng Chen, Kuo-Jui Huang, Pei-Yin Chang
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Publication number: 20090322983Abstract: An illumination device comprising: a wired board having flexibility and including a light source member mounted on one of principal planes; a light-shielding member disposed so as to cover at least part of the other principal plane of the wired board on the opposite side from the one principal plane and having at least partly a light-shielding property; a fixing member having first and second sticking surfaces to which the wired board and the light-shielding member are stuck respectively, a first adhesive layer being interposed between the one principal plane of the wired board and the first sticking surface of the fixing member, having an adhesive property with respect to both of the one principal plane of the wired board and the first sticking surface, and having a first adhesive force with respect to the one principal plane, and a second adhesive layer being disposed on a surface opposing the fixing member of the light-shielding member, and having a portion having an adhesive property with respect to bothType: ApplicationFiled: March 30, 2007Publication date: December 31, 2009Applicant: EPSON IMAGING DEVICES CORPORATIONInventor: Naruo HASHINO
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Patent number: 7637646Abstract: A backlight assembly includes a plurality of light emitting diodes (LEDs), a light guiding plate disposed on the same plane as the LEDs, and a plurality of optical correcting portions formed on a side of the light guiding plate and spaced apart from each other by a predetermined distance to change an optical path.Type: GrantFiled: September 18, 2006Date of Patent: December 29, 2009Assignee: LG Display Co., Ltd.Inventors: Kwan Seob Byun, Jae Lag Ma, Myung Woo Jung, Sun Hee Lee
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Patent number: 7636508Abstract: A display device includes an edge-lit light-transmitting sheet having first and second opposed parallel surfaces. A matrix is applied to at least one of the first and second surfaces and comprises a series of lines extending between opposed edges of the sheet. The spacings between the lines and/or the thicknesses of the lines are so chosen as to obtain a desired intensity of illumination at selected areas of the sheet.Type: GrantFiled: September 11, 2008Date of Patent: December 22, 2009Inventor: David Noel Oliver
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Publication number: 20090303417Abstract: The present invention provides a surface illuminator having a uniform luminance over a large area by using a laser light source, having a wide color reproduction range, and capable of suppressing a speckle noise, as well as a liquid crystal display using the same. The surface illuminator of the present invention includes the laser light source that emits a laser beam; a beam scan section that deflects and scans the laser beam; and a first plate-shaped light guide that makes the laser beam deflected and scanned by the beam scan section to be incident from an end face portion and making the incident laser beam to emit from a first major surface. Further, the liquid crystal display of the present invention includes a liquid crystal display panel and the surface illuminator, wherein the surface illuminator is used as a backlight illuminator that lights the liquid crystal display panel from backside in this liquid crystal display.Type: ApplicationFiled: November 15, 2006Publication date: December 10, 2009Inventors: Tetsuro Mizushima, Ken'ichi Kasazumi, Kiminori Mizuuchi, Kazuhisa Yamamoto, Shin-ichi Kadowaki, Tatsuo Itoh
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Patent number: 7629622Abstract: A light emitting module of a lighting device has a casing, a heat radiating member and terminals. The terminals extend from the casing and connects to a circuit board disposed along a light diffusing member. The heat radiating member extends in a direction perpendicular to the terminals. Alternatively, the terminals are connected to heat radiating lands formed on a second circuit board that is provided separately from a first circuit board and the heat radiating member is connected to a heat radiating land formed on the second circuit board. Further, the heat radiating member can be connected to a heat radiating plate overlapping with the second circuit board, in place of the heat radiating land.Type: GrantFiled: January 23, 2007Date of Patent: December 8, 2009Assignee: Denso CorporationInventors: Kazumasa Kurokawa, Yosimi Kondo
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Patent number: 7628527Abstract: There is provided a back light unit having a light guide buffer plate. The back light unit having a light guide buffer plate includes a light source for generating the light when a power source is applied; a light guide panel whose light-receiving vertical surface that the light emitted from the light source enters is provided with a first prism pattern and whose bottom surface is provided with a refraction pattern, thereby converting the incident light from the light-receiving vertical surface into a surface light source; a reflection unit disposed in a bottom surface of the light guide panel to reflect light toward the light guide panel; and a buffer disposed between the light source and the light guide panel and whose light-emitting vertical surface corresponding to the light-receiving vertical surface of the light guide panel is provided with a second prism pattern.Type: GrantFiled: November 29, 2007Date of Patent: December 8, 2009Assignee: Samsung Electro-Mechanics Co., Ltd.Inventors: Do Hun Kim, Myoung Soo Choi, Choul Ho Lee, Seog Ho Lim, Sung Min Yang
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Patent number: 7616849Abstract: An optical device for collecting and distributing light from a quasi point light source which includes a planar light guide having surfaces through which optical axes are periodically spaced. There is at least one quasi point light source, the optical axis of each being coincident with the optical axes of the surfaces. There is also at least one optical element depressed within the edges or adjacent surfaces of the light guide at least partially rotated about the optical axis, and having a focal point at the quasi point light source.Type: GrantFiled: March 23, 2006Date of Patent: November 10, 2009Inventor: Jerome H. Simon
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Patent number: 7611273Abstract: A point light source includes a body, a light-emitting unit and a fluorescent unit. The body includes a bottom portion and a protrusion portion protruded from the bottom portion. The light-emitting unit includes a light-emitting chip disposed at the protrusion to have an inclined-angle with respect to the bottom portion. The fluorescent unit covers the bottom portion, the protrusion portion and the light-emitting chip. The point light source has an emitting-angle of about 180 degrees and luminance difference between a bright-portion and a dark-portion is decreased to enhance display quality of a display device.Type: GrantFiled: November 29, 2006Date of Patent: November 3, 2009Assignee: Samsung Electronics Co., Ltd.Inventors: Jeong-Min Seo, Byung-Woong Han, Kyu-Seok Kim, Jeung-Soo Kim, Young-Hee Park
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Publication number: 20090268484Abstract: Provided are a backlight assembly and a display device having the same. The backlight assembly includes a light source unit which generates light; and a light guide plate which comprises an incident light surface through which the light from the light source unit enters the light guide plate, an upper surface joined to the incident light surface and that includes a prism pattern, and a lower surface opposing the upper surface and formed with a plurality of concave portions. A diffusing pattern is formed on one of the upper surface and the lower surface.Type: ApplicationFiled: November 7, 2008Publication date: October 29, 2009Inventors: Hyoung-Joo Kim, Sung-Kyu Shim, Seung-In Baek, Jae-Joong Kwon, In-Sun Hwang, Sung-Wook Kang
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Patent number: 7607816Abstract: A light guide plate includes a light incident surface, a light emission surface intersects with the light incident surface, and a bottom surface opposite to the light emission surface. The light incident surface includes at least a first light receiving region and at least a second light receiving region. The first light receiving region has a distinctly different structure in comparison to the second light receiving region. One end of the first light receiving region communicates with the light emission surface, and the other end of the light receiving region communicates with the bottom surface. One end of the second light receiving region communicates with the light emission surface and, the other end of light receiving region communicates with the light emission surface.Type: GrantFiled: August 29, 2007Date of Patent: October 27, 2009Assignee: Hon Hai Precision Industry Co., Ltd.Inventor: Rui-Yong Li
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Patent number: 7604388Abstract: A light-guiding plate, an optical source device and an electronic device. The light-guiding plate including an incident surface, and an emission surface substantially perpendicular to the incident surface. The incident surface has a surface substantially perpendicular to the incident surface, and has projections or depressions extending substantially parallel to the emission surface. The incident surface has flat planes among the projections or depressions.Type: GrantFiled: February 20, 2008Date of Patent: October 20, 2009Assignee: Fujitsu LimitedInventors: Chikara Nishio, Toshikazu Takahashi