Patents by Inventor Takeshi Nishi

Takeshi Nishi 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).

  • Patent number: 8436965
    Abstract: External light is reflected due to a difference in refractive indices of a black matrix and a glass substrate. When the black matrix is a black resin, there is a difference in refractive indices of the black resin and a first substrate. Also, there is a difference in refractive indices of the colored layer and the first substrate. Therefore, external light is slightly reflected. There is a problem in that the reflected light reduces contrast. A structure in which one polarizing element having dichroism is interposed between a pair of substrates is employed, and a light interference layer is provided between a color filter and a glass substrate, whereby a difference in refractive indices is moderated to reduce light reflection.
    Type: Grant
    Filed: May 24, 2012
    Date of Patent: May 7, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Tetsuji Ishitani, Daisuke Kubota, Takeshi Nishi
  • Patent number: 8432502
    Abstract: A low-power-consuming display device including a liquid crystal material which exhibits a blue phase is provided. A display device includes a first substrate having a pixel portion in which a pixel including a transistor is provided; a second substrate which faces the first substrate; and a liquid crystal layer between the first substrate and the second substrate; in which the liquid crystal layer includes a liquid crystal material which exhibits a blue phase; a gate of the transistor is electrically connected to a scan line, one of a source and a drain of the transistor is electrically connected to a signal line, and the other of the source and the drain of the transistor is electrically connected to an electrode; and the transistor includes an oxide semiconductor layer a hydrogen concentration of which is 5×1019/cm3 or less.
    Type: Grant
    Filed: December 1, 2010
    Date of Patent: April 30, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei Yamazaki, Hajime Kimura, Takeshi Nishi
  • Patent number: 8415876
    Abstract: The luminance of different colors of light emitted from EL elements in a pixel portion of a light emitting device is equalized and the luminance of light emitted from the EL elements is raised. The pixel portion of the light emitting device has EL elements whose EL layers contain triplet compounds and EL elements whose EL layers contain singlet compounds in combination. The luminance of light emitted from the plural EL elements is thus equalized. Furthermore, a hole transporting layer has a laminate structure to thereby cause the EL elements to emit light of higher luminance.
    Type: Grant
    Filed: October 11, 2011
    Date of Patent: April 9, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei Yamazaki, Takeshi Nishi, Mayumi Mizukami, Hisao Ikeda
  • Patent number: 8405800
    Abstract: An object of the present invention is to provide a display device having a high contrast ratio by a simple and easy method. Another object of the present invention is to manufacture such a display device having a high contrast ratio at low cost. The present invention relates to a display device including a first substrate; a second substrate; a layer including a display element, wherein the layer including the display element is interposed between the first substrate and the second substrate; and stacked polarizers on the outer side of the first substrate or the second substrate. The stacked polarizers are arranged to be in a parallel Nicols state and the wavelength distributions of the extinction coefficients of the stacked polarizers are different from each other.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: March 26, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Tetsuji Ishitani, Takeshi Nishi, Yuji Egi
  • Patent number: 8396690
    Abstract: A method for manufacturing a liquid crystal device including the steps of: disposing a mixture including a liquid crystal material and a curable resin containing a reaction initiating agent between a pair of substrates wherein at least one of the pair of substrates has an orientation film in contact with the mixture; orienting the liquid crystal material; and curing the resin in the mixture so that the resin is formed on a surface of the orientation film. The resin may be in the form of a film or grains. Also, the resin may be cured by ultraviolet light.
    Type: Grant
    Filed: July 9, 2009
    Date of Patent: March 12, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Toshimitsu Konuma, Takeshi Nishi, Michio Shimizu, Harumi Mori, Kouji Moriya, Satoshi Murakami
  • Patent number: 8368854
    Abstract: An object is to provide a highly reliable liquid crystal display device which includes a liquid crystal layer exhibiting a more stable blue phase. Another object is to provide a method for manufacturing a liquid crystal display device with high yield. Polymer stabilization treatment is performed as follows: a photocurable resin is added to a liquid crystal material exhibiting a blue phase, and the photocurable resin is selectively polymerized by scanning a liquid crystal layer provided between a first substrate and a second substrate with light in a certain direction. Thus, a first region where the light irradiation treatment is performed and a second region where the light irradiation treatment is not performed are formed in the liquid crystal layer. Since polymerization of the photocurable resin proceeds in the first region, the polymerization degree of the photocurable resin in the first region is higher than that in the second region.
    Type: Grant
    Filed: March 16, 2010
    Date of Patent: February 5, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Takeshi Nishi, Tetsuji Ishitani, Daisuke Kubota
  • Publication number: 20130027622
    Abstract: An object of the present invention is to provide a display device having a high contrast ratio by a simple and easy method. Another object of the present invention is to manufacture such a display device having a high contrast ratio at low cost. The present invention relates to a display device including a first substrate; a second substrate; a layer including a display element, wherein the layer including the display element is interposed between the first substrate and the second substrate; and stacked polarizers on the outer side of the first substrate or the second substrate. The stacked polarizers are arranged to be in a parallel Nicols state and the wavelength distributions of the extinction coefficients of the stacked polarizers are different from each other.
    Type: Application
    Filed: July 27, 2012
    Publication date: January 31, 2013
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Tetsuji Ishitani, Takeshi Nishi, Yuji EGI
  • Patent number: 8351012
    Abstract: To control the positioning of a spacer more accurately in a liquid crystal display device to prevent display defects due to incorrect positioning in a display region. To provide a liquid crystal display device with higher image quality and reliability, and to provide a method for manufacturing the liquid crystal display device with high yield. In a liquid crystal display device, a region onto which a spherical spacer is discharged is subjected to liquid-repellent treatment in order to reduce the wettability with respect to a liquid in which the spherical spacer is dispersed. The liquid (the droplet) does not spread over the liquid-repellent region and is dried while moving the spherical spacer toward the center of the liquid. Thus, incorrect positioning shortly after discharging, which has been caused by the loss of control in the liquid, can be corrected by moving the spherical spacer while drying the liquid.
    Type: Grant
    Filed: January 11, 2012
    Date of Patent: January 8, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Erika Takahashi, Gen Fujii, Shuji Fukai, Takeshi Nishi
  • Publication number: 20130001626
    Abstract: The luminance of different colors of light emitted from EL elements in a pixel portion of a light emitting device is equalized and the luminance of light emitted from the EL elements is raised. The pixel portion of the light emitting device has EL elements whose EL layers contain triplet compounds and EL elements whose EL layers contain singlet compounds in combination. The luminance of light emitted from the plural EL elements is thus equalized. Furthermore, a hole transporting layer has a laminate structure to thereby cause the EL elements to emit light of higher luminance.
    Type: Application
    Filed: September 14, 2012
    Publication date: January 3, 2013
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Shunpei YAMAZAKI, Takeshi NISHI, Mayumi MIZUKAMI, Hisao IKEDA
  • Publication number: 20130003003
    Abstract: In the present invention, it is an object to improve display quality by improving response speed of a liquid crystal element in a liquid crystal display device, in particular, response speed in the case of falling. [Means for Solving the Problems] In the present invention, it is characterized that a liquid crystal layer is divided into plural regions (domains) substantially by mixing a chemical compound including a liquid crystal skeleton in a liquid crystal layer exisiting liquid crystal molecules as a technique to improve response speed of a liquid crystal element in a liquid crystal display device for solving the above problem.
    Type: Application
    Filed: September 13, 2012
    Publication date: January 3, 2013
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Takeshi NISHI, Tetsuji ISHITANI, Daisuke KUBOTA
  • Publication number: 20130003355
    Abstract: It is an object to manufacture a highly reliable backlight device with less color unevenness and less luminance unevenness, and a high-performance and highly reliable display device including the backlight device, which can display a high quality image. A light emitting diode (LED) is used as a light source of a backlight device and thermoelectric elements are provided in a chassis for holding the light emitting diode so as to surround the light emitting diode (the thermoelectric elements are provided under the light emitting diode and on the four sides thereof). A temperature in the backlight device is adjusted by cooling and heating by the thermoelectric elements.
    Type: Application
    Filed: September 12, 2012
    Publication date: January 3, 2013
    Inventors: Koji Moriya, Takeshi Nishi
  • Publication number: 20130005054
    Abstract: There is provided a film formation apparatus which is capable of forming an EL layer using an EL material with high purity. The EL material is purified by sublimation immediately before film formation in the film formation apparatus, to thereby remove oxygen, water, and another impurity, which are included in the EL material. Also, when film formation is performed using the EL material (high purity EL material) obtained by purifying with sublimation as an evaporation source, a high purity EL layer can be formed.
    Type: Application
    Filed: September 13, 2012
    Publication date: January 3, 2013
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Shunpei Yamazaki, Toshimitsu Konuma, Takeshi Nishi
  • Patent number: 8338824
    Abstract: By doping an organic compound functioning as an electron donor (hereinafter referred to as donor molecules) into an organic compound layer contacting a cathode, donor levels can be formed between respective LUMO (lowest unoccupied molecular orbital) levels between the cathode and the organic compound layer, and therefore electrons can be injected from the cathode, and transmission of the injected electrons can be performed with good efficiency. Further, there are no problems such as excessive energy loss, deterioration of the organic compound layer itself, and the like accompanying electron movement, and therefore an increase in the electron injecting characteristics and a decrease in the driver voltage can both be achieved without depending on the work function of the cathode material.
    Type: Grant
    Filed: January 6, 2011
    Date of Patent: December 25, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Takeshi Nishi, Satoshi Seo
  • Patent number: 8339558
    Abstract: In a horizontal electric field drive type liquid crystal electro-optic device, a gate electrode, a source electrode, a drain electrode, a semiconductor film and a common electrode are formed on a glass substrate and a liquid crystal material is driven by controlling the strength of an electric field substantially parallel to the glass substrate. The electrodes and the semiconductor film are made curved, for example semi-circular or semi-elliptical, in sectional profile. These curved sectional profiles can be formed by suitably selecting and combining various patterning and etching methods.
    Type: Grant
    Filed: October 13, 2011
    Date of Patent: December 25, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei Yamazaki, Takeshi Nishi, Rumo Satake
  • Publication number: 20120307188
    Abstract: In a method for manufacturing a liquid crystal display device in which a liquid crystal layer is formed by dropping liquid crystal by a dropping method, a surface of a sealant which is formed over a first substrate is cured by a first cure treatment before dropping the liquid crystal, and then the liquid crystal is dropped. A second substrate has a plurality of projections in a sealant adhesive region. The first substrate and the second substrate are attached to each other with the liquid crystal interposed therebetween so that the plurality of projections is in contact with an uncured region in the sealant formed over the first substrate.
    Type: Application
    Filed: August 17, 2012
    Publication date: December 6, 2012
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Takeshi NISHI, Tetsuji ISHITANI
  • Publication number: 20120287365
    Abstract: A liquid crystal display device includes a first substrate, a second substrate opposed to the first substrate with a gap therebetween, a thin film transistor formed over the first substrate, an interlayer insulating film formed over the thin film transistor, a pixel electrode electrically connected to the thin film transistor, at least one common electrode formed over the interlayer insulating film such that an electric field in parallel with the first substrate is produced by the common electrode and the pixel electrode, and a liquid crystal layer between the first substrate and the second substrate.
    Type: Application
    Filed: May 24, 2012
    Publication date: November 15, 2012
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Yoshiharu Hirakata, Takeshi Nishi, Rumo Satake
  • Patent number: 8310650
    Abstract: It is an object to prevent disordered orientation of liquid crystal molecules which is due to division of substrates even when a liquid crystal dripping method is used, and to provide a method for manufacturing a liquid crystal display device in which liquid crystal is not adversely affected even when a sealant not cured and liquid crystal are in contact. In a method for manufacturing a liquid crystal display device using a liquid crystal dripping method, a scribe groove is provided for at least one of a pair of substrates with a diamond cutter or the like before the pair of substrates are attached under reduced pressure. After the scribing, the pair of substrates are attached under reduced pressure, heat treatment for curing the sealant and aligning the liquid crystal molecules is performed, and the substrates are divided by applying impact using a breaking apparatus.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: November 13, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Masahide Kanai, Takeshi Nishi
  • Patent number: 8277068
    Abstract: It is an object to manufacture a highly reliable backlight device with less color unevenness and less luminance unevenness, and a high-performance and highly reliable display device including the backlight device, which can display a high quality image. A light emitting diode (LED) is used as a light source of a backlight device and thermoelectric elements are provided in a chassis for holding the light emitting diode so as to surround the light emitting diode (the thermoelectric elements are provided under the light emitting diode and on the four sides thereof). A temperature in the backlight device is adjusted by cooling and heating by the thermoelectric elements.
    Type: Grant
    Filed: March 12, 2012
    Date of Patent: October 2, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Koji Moriya, Takeshi Nishi
  • Patent number: 8278135
    Abstract: There is provided a film formation apparatus which is capable of forming an EL layer using an EL material with high purity. The EL material is purified by sublimation immediately before film formation in the film formation apparatus, to thereby remove oxygen, water, and another impurity, which are included in the EL material. Also, when film formation is performed using the EL material (high purity EL material) obtained by purifying with sublimation as an evaporation source, a high purity EL layer can be formed.
    Type: Grant
    Filed: September 18, 2007
    Date of Patent: October 2, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei Yamazaki, Toshimitsu Konuma, Takeshi Nishi
  • Patent number: 8274628
    Abstract: In the present invention, it is an object to improve display quality by improving response speed of a liquid crystal element in a liquid crystal display device, in particular, response speed in the case of falling. In the present invention, it is characterized that a liquid crystal layer is divided into plural regions (domains) substantially by mixing a chemical compound including a liquid crystal skeleton in a liquid crystal layer having existing liquid crystal molecules as a technique to improve response speed of a liquid crystal element in a liquid crystal display device for solving the above problem.
    Type: Grant
    Filed: June 11, 2009
    Date of Patent: September 25, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Takeshi Nishi, Tetsuji Ishitani, Daisuke Kubota