Patents by Inventor Masatake Baba
Masatake Baba has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8552965Abstract: To provide a liquid crystal display device capable of switching the range of viewing angles while being able to reduce the cost and thickness of the device, and to provide an electronic appliance having the same. The display device according to the present invention includes: a liquid crystal type display panel having a diffusive reflection part which diffusively reflects light irradiated from the front side while transmitting light from the back side; and a backlight source disposed on a back face of the display panel along the display panel for switchably outputting transmission light of different directivities.Type: GrantFiled: October 29, 2008Date of Patent: October 8, 2013Assignee: NLT Technologies, Ltd.Inventors: Ken Sumiyoshi, Koji Mimura, Yuji Kondo, Masatake Baba
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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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Publication number: 20090109169Abstract: To provide a liquid crystal display device capable of switching the range of viewing angles while being able to reduce the cost and thickness of the device, and to provide an electronic appliance having the same. The display device according to the present invention includes: a liquid crystal type display panel having a diffusive reflection part which diffusively reflects light irradiated from the front side while transmitting light from the back side; and a backlight source disposed on a back face of the display panel along the display panel for switchably outputting transmission light of different directivities.Type: ApplicationFiled: October 29, 2008Publication date: April 30, 2009Applicant: NEC LCD TECHNOLOGIES, LTD.Inventors: Ken SUMIYOSHI, Koji Mimura, Yuji Kondo, Masatake Baba
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Publication number: 20090103283Abstract: 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: ApplicationFiled: October 17, 2008Publication date: April 23, 2009Applicant: NEC LCD TECHNOLOGIES, LTD.Inventor: Masatake BABA
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Patent number: 7413334Abstract: A plurality of LEDs are arrayed in a single row between the opposing end faces of a pair of first and second light guide plates that are disposed so that the end faces thereof face each other. A reflective sheet is disposed on the lower surfaces of the pair of first and second light guide plates, and a separation plate is disposed so as to cover the upper surfaces of the first and second light guide plates and the gap therebetween. A reflecting body for guiding light emitted upward from the LEDs to the first and second light guide plates is disposed in the area immediately above the LEDs on the lower surface of the separation plate. A diffusion plate is disposed with a fixed gap above the separation plate, and a hollow area is formed between the diffusion plate and the separation plate.Type: GrantFiled: May 17, 2006Date of Patent: August 19, 2008Assignee: NEC LCD Technologies, Ltd.Inventor: Masatake Baba
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Publication number: 20070064421Abstract: A backlight source of a LCD device includes constant-power red, green and blue LEDs emitting light having a constant output power, and a tone-correction red LED emitting light having a controlled output power controlled based on the temperature of the backlight source. The tone-correction red LED has a larger output power upon a temperature rise to supplement the reduced output power of the constant-power red LED.Type: ApplicationFiled: September 15, 2006Publication date: March 22, 2007Inventor: Masatake Baba
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Publication number: 20060262564Abstract: A plurality of LEDs are arrayed in a single row between the opposing end faces of a pair of first and second light guide plates that are disposed so that the end faces thereof face each other. A reflective sheet is disposed on the lower surfaces of the pair of first and second light guide plates, and a separation plate is disposed so as to cover the upper surfaces of the first and second light guide plates and the gap therebetween. A reflecting body for guiding light emitted upward from the LEDs to the first and second light guide plates is disposed in the area immediately above the LEDs on the lower surface of the separation plate. A diffusion plate is disposed with a fixed gap above the separation plate, and a hollow area is formed between the diffusion plate and the separation plate. Reflectors for causing light emitted from the first and second light guide plates to enter the hollow area are disposed at the end faces of the first and second light guide plates that face the LEDs.Type: ApplicationFiled: May 17, 2006Publication date: November 23, 2006Applicant: NEC LCD TECHNOLOGIES, LTD.Inventor: Masatake Baba
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Publication number: 20060002146Abstract: Light emitted in side surface directions from side-emitting red, green, and blue LEDs which are arranged on an LED array substrate is introduced into a light guide from side surfaces of a groove-shaped recessed portion, and propagates in the light guide. Thus, the three colors are mixed. The light further propagates in the light guide while being reflected at both side end surfaces of the light guide by the function of a reflective sheet and the like. Thus, color mixing progresses. Further, the light is reflected upward by diffuse reflective means provided on the lower surface of the light guide, and emitted as backlight light to the outside through a diffuse sheet.Type: ApplicationFiled: June 30, 2005Publication date: January 5, 2006Applicant: NEC LCD Technologies, Ltd.Inventor: Masatake Baba
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Fluorescent lamp, fluorescent lamp unit, liquid crystal display device, and method of emitting light
Patent number: 6917354Abstract: A liquid crystal display device has a fluorescent lamp and a driving circuit as a back light. A closed container, a discharge gas sealed in the closed container, first discharge electrodes, and second discharge electrodes are included in the fluorescent lamp. The driving circuit repeats a first step of causing electric discharge in first discharge areas by applying a voltage having a negative polarity to the first discharge electrodes and a voltage having a positive polarity to the second discharge electrodes, and a second step of causing electric discharge in second discharge areas which are different from the first discharge areas by applying a voltage having a positive polarity to the first discharge electrodes and a voltage having a negative polarity to the second discharge electrodes.Type: GrantFiled: February 12, 2002Date of Patent: July 12, 2005Assignee: NEC LCD Technologies, Inc.Inventors: Fumihiko Fujishiro, Masatake Baba, Syuuki Yamamori -
Patent number: 6816213Abstract: The present invention provides a mounting structure for mounting a liquid crystal module to a cover of a mobile terminal. The mounting structure comprises: at least a pair of first and second engagement parts, wherein the first engagement part is provided on a side portion of the liquid crystal module, while the second engagement part is provided on a side portion of a structural member of the cover, so that the paired first and second engagement parts are engaged with each other only by fitting the liquid crystal module into the structural member of the cover.Type: GrantFiled: December 9, 2002Date of Patent: November 9, 2004Assignee: NEC LCD Technologies, Ltd.Inventors: Kasuhiro Kato, Masatake Baba, Michiaki Nishiyama, Fumihiko Fujishiro, Takakazu Yano, Toshihisa Ogawa, Tomoo Miwa, Yasuhiro Sato
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Patent number: 6654078Abstract: The present invention provides a mounting structure for mounting a liquid crystal module to a cover of a mobile terminal. The mounting structure comprises: at least a pair of first and second engagement parts, wherein the first engagement part is provided on a side portion of the liquid crystal module, whilst the second engagement part is provided on a side portion of a structural member of the cover, so that the paired first and second engagement parts are engaged with each other only by fitting the liquid crystal module into the structural member of the cover.Type: GrantFiled: February 17, 2000Date of Patent: November 25, 2003Assignee: NEC LCD Technologies, Ltd.Inventors: Katsuhiro Kato, Masatake Baba, Michiaki Nishiyama, Fumihiko Fujishiro, Takakazu Yano, Toshihisa Ogawa, Tomoo Miwa, Yasuhiro Sato
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Patent number: 6644824Abstract: In a light unit that converts a false linear light into which a light from a point light source has been converted by a columnar light guide, into a planar light by a plate-shaped light guide, the point light source is arranged only at an end of the columnar light guide at which an angle between a longitudinal direction of the columnar light guide and ridge lines of recesses and projections forming a prism surface is obtuse. Thus, a positional relationship between the point light source and the ridge lines is set so that a main irradiation direction of band-shaped light emitted from the columnar light guide and which has been obtained by converting the light from the point light source to a false linear light is not substantially orthogonal to the ridge lines of the recesses and projections forming the prism surface of the plate-shaped light guide. Consequently, light obtained by totally reflecting this band-shaped light is unlikely to be viewed.Type: GrantFiled: December 21, 2001Date of Patent: November 11, 2003Assignee: NEC LCD Technologies, Ltd.Inventor: Masatake Baba
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Patent number: 6594143Abstract: The present invention provides a mounting structure for mounting a liquid crystal module having a display area. The mounting structure comprises: at least a frame member having a plurality of connecting members for connecting the frame member to the liquid crystal module substantially in parallel to each other, wherein each of the connecting members extends between the liquid crystal module and the frame member in a direction vertical to a surface of the frame member.Type: GrantFiled: December 13, 1999Date of Patent: July 15, 2003Assignee: NEC CorporationInventors: Takakazu Yano, Tomoo Miwa, Yasuhiro Sato, Toshihisa Ogawa, Michiaki Nishiyama, Masatake Baba, Hikaru Okabe, Fumihiko Fujishiro, Katsuhiro Kato, Kazuaki Mikami, Hirokazu Fukuyoshi
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Publication number: 20030063230Abstract: The present invention provides a mounting structure for mounting a liquid crystal module to a cover of a mobile terminal. The mounting structure comprises: at least a pair of first and second engagement parts, wherein the first engagement part is provided on a side portion of the liquid crystal module, whilst the second engagement part is provided on a side portion of a structural member of the cover, so that the paired first and second engagement parts are engaged with each other only by fitting the liquid crystal module into the structural member of the cover.Type: ApplicationFiled: December 9, 2002Publication date: April 3, 2003Applicant: NEC CORPORATIONInventors: Katsuhiro Kato, Masatake Baba, Michiaki Nishiyama, Fumihiko Fujishiro, Takakazu Yano, Toshihisa Ogawa, Tomoo Miwa, Yasuhiro Sato
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Patent number: 6518691Abstract: An area type light emitting device, in which a reflection component can be firmly fixed to a transparent light guide component, and the manufacturing cost of the device can be reduce, is provided.Type: GrantFiled: May 19, 2000Date of Patent: February 11, 2003Assignee: NEC CorporationInventor: Masatake Baba
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Fluorescent lamp, fluorescent lamp unit, liquid crystal display device, and method of emitting light
Publication number: 20020154258Abstract: A liquid crystal display device has a fluorescent lamp and a driving circuit as a back light. A closed container, a discharge gas sealed in the closed container, first discharge electrodes, and second discharge electrodes are included in the fluorescent lamp. The driving circuit repeats a first step of causing electric discharge in first discharge areas by applying a voltage having a negative polarity to the first discharge electrodes and a voltage having a positive polarity to the second discharge electrodes, and a second step of causing electric discharge in second discharge areas which are different from the first discharge areas by applying a voltage having a positive polarity to the first discharge electrodes and a voltage having a negative polarity to the second discharge electrodes.Type: ApplicationFiled: February 12, 2002Publication date: October 24, 2002Applicant: NEC CorporationInventors: Fumihiko Fujishiro, Masatake Baba, Syuuki Yamamori -
Publication number: 20020109805Abstract: The invention relates to a backlight unit for a LCD unit provided with a light guide plate, at least one light source unit provided to at least one side of the light guide plate, a passive reflector provided so that it is opposite to the rear surface of the light guide plate and plural reflection regions and plural transmission regions respectively provided to the rear surface of the light guide plate and characterized in that an angle between the surface of the light guide plate opposite to the rear surface and at least one of the reflection regions is larger than an angle between the surface and at least one of the transmission regions. The invention is also characterized in that portable terminal equipment is provided with the backlight unit for the LCD device.Type: ApplicationFiled: February 13, 2002Publication date: August 15, 2002Inventor: Masatake Baba
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Publication number: 20020080433Abstract: In a light unit that converts a false linear light into which a light from a point light source has been converted by a columnar light guide, into a planar light by a plate-shaped light guide, the point light source is arranged only at an end of the columnar light guide at which an angle between a longitudinal direction of the columnar light guide and ridge lines of recesses and projections forming a prism surface is obtuse. Thus, a positional relationship between the point light source and the ridge lines is set so that a main irradiation direction of band-shaped light emitted from the columnar light guide and which has been obtained by converting the light from the point light source to a false linear light is not substantially orthogonal to the ridge lines of the recesses and projections forming the prism surface of the plate-shaped light guide. Consequently, light obtained by totally reflecting this band-shaped light is unlikely to be viewed.Type: ApplicationFiled: December 21, 2001Publication date: June 27, 2002Applicant: NEC CorporationInventor: Masatake Baba
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Patent number: 5557433Abstract: In a TN LCD, a prism lens film and a wave lens film are disposed on the incoming and outgoing sides of a liquid crystal panel, respectively, to obtain an image wide in visual angle and good in its quality. Thus, outgoing light having a sharp directivity, can be obtained from light emitted from a surface illuminant and having a gradually varying directional property by the prism lens film. Further, with a louver film provided in front of the prism lens film, all the light traveling in the diagonal direction can be cut off so that substantially parallel light enter the liquid crystal panel. Since the light in which a variation in retardation is next to nothing, is diffused by the wave lens film, a wide visual-angle representation free of a dependence on the visual angle can be obtained.Type: GrantFiled: February 13, 1995Date of Patent: September 17, 1996Assignee: NEC CorporationInventors: Muneo Maruyama, Toshihiko Ueno, Hiroshi Hada, Masatake Baba