Patents Assigned to NLT Technologies, Ltd.
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Patent number: 8395578Abstract: A backlight unit shortens the necessary time from the time immediately after the turn on to the time the emitted light is converged to a predetermined chromaticity while the quality of time-varying images is improved. Under the control of the backlight controller section, the Light-Emitting Diodes (LEDs), which are assigned to the respective light-emitting regions of the light-emitting surface, are driven to emit lights sequentially in the predetermined scanning light-emitting periods for the scan type lighting and the additional light-emitting periods in a single frame, responsive to the write scanning of an image signal to the LCD panel. The additional light-emitting periods are outside a corresponding one of the scanning light-emitting periods. In each additional light-emitting period, the LEDs emit light in synchronization with the supply of the optical leakage preventing signal (e.g., the black inserting signal) to the LCD panel.Type: GrantFiled: March 31, 2008Date of Patent: March 12, 2013Assignee: NLT Technologies, Ltd.Inventor: Eitaro Nishigaki
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Patent number: 8395731Abstract: To provide a liquid crystal panel capable of realizing excellent display performance using a circular polarizing plate therein, and a liquid crystal display device and a terminal device using the same, with respect to a semi-transmission type liquid crystal display device in a horizontal electric field mode (In-Plane Switching: IPS). A viewer-side circular polarizing plate and a backside circular polarizing plate are disposed outside of a viewer-side substrate and a backside substrate respectively, and a viewer-side compensation plate and a backside compensation plate are disposed between the respective polarizing plates and substrates to reduce a refractive index anisotropy of a liquid crystal layer.Type: GrantFiled: September 23, 2011Date of Patent: March 12, 2013Assignee: NLT Technologies, Ltd.Inventors: Shinichi Uehara, Jin Matsushima, Ken Sumiyoshi
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Patent number: 8384838Abstract: A liquid crystal display device is provided, capable of minimizing deterioration in display quality of a liquid crystal panel due to external force generated by connection with an external chassis such as a customer's chassis. The liquid crystal display device has, at least, a front frame, a liquid crystal panel, and a backlight unit having at least a rear frame, arranged in this order. A back fixing frame to be fixed to the front frame is provided on the back face of the liquid crystal display device, and attachment portions to be attached to an external chassis are provided in the back fixing frame. This makes it difficult for external force generated by connection with the external chassis to be transmitted to the liquid crystal panel or the backlight unit, suppresses deformation of the liquid crystal panel or reflection sheet and prevents deterioration in display quality.Type: GrantFiled: April 25, 2008Date of Patent: February 26, 2013Assignee: NLT Technologies, Ltd.Inventors: Hideaki Sugawara, Yasushi Takada
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Patent number: 8382299Abstract: A beam direction control element has transparent areas and light absorption areas alternately arranged on a surface of a substrate, wherein the light absorption areas function as a louver for controlling the direction of a beam of light. The beam direction control element is manufactured by disposing an optically transparent material on a first transparent substrate to form transparent ridges which constitute the transparent areas, filling curable and photo-absorptive fluid in gaps between the transparent ridges, and then curing the fluid to form the light absorption areas.Type: GrantFiled: September 8, 2010Date of Patent: February 26, 2013Assignee: NLT Technologies, Ltd.Inventors: Koji Mimura, Ken Sumiyoshi
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Patent number: 8384462Abstract: To provide, with a simple structure, a voltage controlled oscillator, etc., whose center oscillation frequency is stable even if there is a change in the temperature. A delay element includes: a delay generating part which adds a delay amount to an input signal to generate an output signal; and a delay control part which controls the delay. The delay control part has a delay adjusting circuit which outputs a first control signal for adjusting the delay amount, and a temperature compensating circuit which outputs a second control signal for compensating property changes caused by the temperature. The delay control part outputs a third control signal obtained by synthesizing the first control signal and the second control signal to the delay generating part to control the delay amount. The delay control part obtains the third control signal by having the delay adjusting circuit and the temperature compensating circuit connected in series.Type: GrantFiled: November 25, 2008Date of Patent: February 26, 2013Assignee: NLT Technologies, Ltd.Inventor: Kenichi Takatori
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Patent number: 8379178Abstract: In an image display device where a lenticular lens, a display panel, and a light source are provided in order from a viewer side, when cylindrical lenses of the lenticular lens are arrayed in a horizontal direction, in first-viewpoint pixels and second-viewpoint pixels of the display panel, openings whose sides which intersect with straight lines in the horizontal direction are not parallel to a vertical direction are formed. And, a shape of the openings of a pair of pixels mutually adjacent in the vertical direction is made line-symmetric with respect to edges of the pixels extending in the horizontal direction as an axis.Type: GrantFiled: May 6, 2011Date of Patent: February 19, 2013Assignee: NLT Technologies, Ltd.Inventors: Shin-ichi Uehara, Masao Iriguchi, Naoyasu Ikeda, Nobuaki Takanashi
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Patent number: 8373822Abstract: A surface emitting device includes a light guide plate having a light outgoing surface and a reflection surface and an LED light source that includes an LED element provided so that light from the LED element enters the light guide plate through a light incoming end surface of the light guide plate. The light guide plate includes a concave portion corresponding to the LED element on a side of the reflection surface just in front of the LED light source. The concave portion has dimensions in which a width of the light guide plate is equal to or larger than a width of a light outgoing surface of the LED element, and a depth from the reflection surface in a thickness direction of the light guide plate is set so that the concave portion does not overlap with a region opposed to the light outgoing surface of the LED element.Type: GrantFiled: March 9, 2010Date of Patent: February 12, 2013Assignee: NLT Technologies, Ltd.Inventor: Yukinori Hashimoto
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Patent number: 8373830Abstract: A liquid crystal display device including a first substrate, a second substrate facing and spaced away from the first substrate, a liquid crystal layer sandwiched between the first and second substrates, a switching device formed on the first substrate, a first electrically insulating film randomly patterned on the first substrate, a second electrically insulating film covering the first electrically insulating film therewith, and having a wavy surface, and a reflection electrode formed on the second electrically insulating film, and electrically connected to an electrode of the switching device, wherein a light passing through the second substrate and the liquid crystal layer is reflected at the reflection electrode, and the second electrically insulating film extends outwardly from the first electrically insulating film by a certain length at an end of a display region in which images are to be displayed, such that a step formed by the first and second electrically insulating films in the vicinity of the enType: GrantFiled: August 8, 2011Date of Patent: February 12, 2013Assignee: NLT Technologies, Ltd.Inventors: Hironori Kikkawa, Michiaki Sakamoto, Yuichi Yamaguchi, Hidenori Ikeno, Fumihiko Matsuno
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Patent number: 8373691Abstract: An active-matrix bistable display panel is provided in which a pixel electrode is formed at each intersection of each of a plurality of scanning lines in a row direction and each of a plurality of signal lines in a column direction and a display state is made to occur depending on a voltage of each of the pixel electrodes, a signal-line driving unit is provided in which the plurality of signal lines is connected to a plurality of terminals and image inputs are sequentially divided into a plurality of image inputs and a plurality of image signals are supplied sequentially to the plurality of terminals in a time-division manner, and a scanning-line driving unit is provided in which each scanning line making up the plurality of groups is sequentially driven for each of the groups, wherein each of TFTs (Thin Film Transistors) is made active so as to supply an image voltage to each of pixel electrodes.Type: GrantFiled: July 8, 2011Date of Patent: February 12, 2013Assignee: NLT Technologies, Ltd.Inventors: Michiaki Sakamoto, Yuji Kondo, Nobuaki Honbo
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Patent number: 8368639Abstract: A display device is provided including an optical waveguide, and a light source, and also a louver, a transparent/scattering state switching element, and a transmissive liquid crystal display panel, provided in order on the side of a light-emitting surface of the optical waveguide. The transparent/scattering state switching element switches between a state for scattering the incident light and a state for transmitting the light without scattering. The light source drive circuit causes the transparent/scattering state switching element to transfer from the transparent state to the scattering state, and when the viewing angle range of the display is switched from narrow to wide, the intensity of the light source is gradually increased in conjunction with the transition state of the transparent/scattering state switching element.Type: GrantFiled: October 20, 2011Date of Patent: February 5, 2013Assignee: NLT Technologies, Ltd.Inventors: Shinichi Uehara, Ken Sumiyoshi, Fujio Okumura
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Patent number: 8368861Abstract: A liquid crystal display device comprises a plurality of pixels arrayed in a first direction and a second direction, each of the pixels having a reflective area in at least a portion thereof. The reflective area comprises a surface-irregularity film that is a film having a plurality of surface irregularities, a light reflecting film disposed as an upper layer over the surface-irregularity film, and an electrode group disposed as an upper layer over the light reflecting film. The electrode group in each of the pixels that are arrayed in at least the first direction comprises at least two types of electrode patterns having different layouts.Type: GrantFiled: September 25, 2008Date of Patent: February 5, 2013Assignee: NLT Technologies, Ltd.Inventors: Shinya Niioka, Ken Sumiyoshi
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Patent number: 8363304Abstract: In fabrication of an electrophoretic display device, a display defect (blotches or smears on the display screen) caused by the fact that a very small quantity of moisture and/or air bubbles existing near the electrophoretic display element layer enter the inside of the layer, and another display defect (defective driving) caused by the fact that the said moisture and/or air bubbles enter the boundary between the first substrate and the layer, are reliably prevented. The display element layer is fixed on the display region of the TFT substrate, the sealing member is formed on the TFT substrate to surround the display element layer, and the glass substrate is fixed to the sealing member, constituting the closed inner space around the layer. The space is filled with an inert gas having a pressure approximately equal to an atmospheric pressure or set in a predetermined vacuum state.Type: GrantFiled: August 28, 2007Date of Patent: January 29, 2013Assignee: NLT Technologies, Ltd.Inventor: Hiromitsu Tanaka
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Patent number: 8362975Abstract: To provide a display device that is capable of achieving a sufficient confidentiality keeping performance for directions other than a specific direction without a troublesome work such as wearing special eyeglasses. The display device includes: a plurality of display units each having a main pixel for displaying a first image and a sub-pixel for displaying a second image arranged in matrix in a first direction and a second direction; and an optical member which distributes light emitted from the plurality of display units towards different directions along the first direction. The display unit has a first display area in which the main pixel and the sub-pixel are formed in the second direction, and a second display area in which only the main pixel is formed.Type: GrantFiled: February 19, 2009Date of Patent: January 29, 2013Assignee: NLT Technologies, Ltd.Inventor: Shinichi Uehara
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Patent number: 8363184Abstract: In an LCD device, a circular polarizer is provided to each of two substrates that hold a liquid crystal layer. The circular polarizer on the display surface side includes a polarizer, ?/2 plate in which Rth>0, and a ?/4 plate in which Rth<0; and the circular polarizer on the backlight side includes a polarizer, a ?/2 plate in which Rth<0, and a ?/4 plate in which Rth>0. Rth is a retardation in the thickness direction of a ?/2 plate or a ?/4 plate. The absolute value of the sum of the Rth between the ?/2 plate for which Rth>0 and the ?/2 plate for which Rth<0 is reduced, and in the absolute value of the sum of the Rth between the ?/4 plate for which Rth<0 and the ?/4 plate for which Rth>0.Type: GrantFiled: May 3, 2011Date of Patent: January 29, 2013Assignees: NEC Corporation, NLT Technologies, Ltd.Inventors: Jin Matsushima, Ken Sumiyoshi, Shin-ichi Uehara
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Patent number: 8358389Abstract: An active matrix liquid crystal display device of the invention includes a liquid crystal display panel operating in a normally black mode having a first substrate provided with a color filter and a second substrate provided with an active matrix array, wherein the first substrate is provided with a laminated colored layer with three colors, a laminated colored layer with two colors and a colored layer with one color in a frame part surrounding a display area without being provided with a black matrix, and the second substrate is provided with a conductive film formed in a region which is opposed to the laminated colored layer with two colors and the colored layer with one color, between the display area and the laminated colored layer with three colors.Type: GrantFiled: March 27, 2012Date of Patent: January 22, 2013Assignee: NLT Technologies, Ltd.Inventors: Shinichi Nishida, Hideki Itou, Teruaki Suzuki, Sounosuke Takahashi, Yoshikazu Sakaguchi
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Patent number: 8358392Abstract: A lateral electric field type active-matrix addressing liquid crystal display device suppresses the lateral cross talk induced by the coupling capacitances (i.e., the parasitic capacitances) between the drain bus lines and the common bus line corresponding thereto with a simple structure. In each of the pixel electrodes, at least one electrically isolated light-shielding electrode is formed to extend along the drain bus lines that define the pixel electrode near the same drain bus lines. The light-shielding electrode is overlapped with a part of a corresponding one of the pixel electrodes to the pixel region in such a way that an insulating film intervenes between the light-shielding electrode and the part, the part extending along these drain bus lines in the vicinities thereof. The light-shielding electrode may be electrically connected to the corresponding one of the pixel electrodes at a point in the pixel region.Type: GrantFiled: October 10, 2008Date of Patent: January 22, 2013Assignee: NLT Technologies, Ltd.Inventors: Teruaki Suzuki, Shinichi Nishida
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Patent number: 8339538Abstract: A display device comprising a light source and having an optical waveguide, a louver, an anisotropic scattering sheet, and a transmissive liquid crystal panel disposed along the path of light emitted from the light source. The light-restricting direction of the louver is tilted at an angle ? from the Y-axis direction. The value of the angle ? is set so that the arrangement direction of moiré created between the louver and the liquid crystal panel approaches the X-axis direction. A plurality of belt-shaped convex portions extending in the Y-axis direction are formed on the surface of the anisotropic scattering sheet, and are configured so that the scattering direction of the light has anisotropy. Specifically, scattering in the X-axis direction is increased, and scattering in the Y-axis direction is reduced. Moiré can thereby be reduced in a display device having increased directivity of the display.Type: GrantFiled: April 21, 2006Date of Patent: December 25, 2012Assignees: NLT Technologies, Ltd., NEC CorporationInventors: Shin-ichi Uehara, Shinya Niioka, Masao Imai
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Patent number: 8339528Abstract: To provide an erasing device whose power consumption required for erasing operations is suppressed, which does not spoil the portability of an optical writing type display medium. In a first display function layer, voltages applied to two cholesteric liquid crystal layers when an erasing voltage is applied between a pair of electrodes are defined as V1, V2, respectively, and threshold voltages with which the cholesteric liquid crystal layers change to the homeotropic alignment are defined as Vth1, Vth2, respectively. In that case, in a state the voltages V1 and V2 are determined according to only each resistance of the cholesteric liquid crystal layers and resistance of a photoconductive layer, i.e., a sufficient time has passed from a point at which the erasing voltage is applied, V1?Vth1 and V2?Vth2 apply.Type: GrantFiled: October 19, 2010Date of Patent: December 25, 2012Assignee: NLT Technologies, Ltd.Inventors: Kenichi Mori, Tetsushi Satou, Koji Shigemura, Setsuo Kaneko
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Patent number: 8334553Abstract: A thin-film transistor manufactured on a transparent substrate has a structure of a top gate type crystalline silicon thin-film transistor in which a light blocking film, a base layer, a crystalline silicon film, a gate insulating film, and a gate electrode film arranged not to overlap at least a channel region are sequentially formed on the transparent substrate. The channel region has channel length L, LDD regions having LDD length d on both sides of the channel region, a source region, and a drain region are formed in the crystalline silicon film. The light blocking film is divided across the channel region. Interval x between the divided light blocking films is equal to or larger than channel length L and equal to or smaller than a sum of channel length L and a double of LDD length d (L+2d), allowing low the manufacturing cost and suppressed photo leak current.Type: GrantFiled: February 14, 2011Date of Patent: December 18, 2012Assignee: NLT Technologies, Ltd.Inventors: Shigeru Mori, Takahiro Korenari, Hiroshi Tanabe
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Patent number: 8330193Abstract: The present invention provides a high-performance silicon oxide film as a gate insulation film and a semiconductor device having superior electric characteristics. The silicon oxide film according to the present invention includes CO2 in the film, wherein, when an integrated intensity of a peak is expressed by (peak width at half height)×(peak height) in an infrared absorption spectrum, the integrated intensity of a CO2-attributed peak which appears in the vicinity of a wave number of 2,340 cm?1 is 8E-4 times or more with respect to the integrated intensity of an SiO2-attributed peak which appears in the vicinity of a wave number of 1,060 cm?1.Type: GrantFiled: June 2, 2008Date of Patent: December 11, 2012Assignee: NLT Technologies, Ltd.Inventors: Shigeru Mori, Hiroshi Tanabe, Jun Tanaka