Patents by Inventor Norio Mamba

Norio Mamba 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: 8537125
    Abstract: A display device having an electrostatic capacity touch panel includes: X electrodes XP and Y electrodes YP which intersect each other via a first insulating layer; and a plurality of Z electrodes disposed in a floating state via a second insulating layer. For the second insulating layer, a material such as an elastic insulating material which changes in thickness by pressing of touch is used. The Z electrode is disposed so as to overlap both one of the X electrodes and one of the Y electrodes. A pad part of the X electrode has a largest area in the vicinity of a thin line part of the X electrode, and a smallest area in the vicinity of the thin line part of the adjacent X electrode. An area of the pad part is reduced as the pad part departs from the thin line part of the X electrode.
    Type: Grant
    Filed: July 2, 2009
    Date of Patent: September 17, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Norio Mamba, Tsutomu Furuhashi, Kouichi Anno
  • Patent number: 8493305
    Abstract: An image processing unit (2 in FIG. 1) discards a high gray level side of input image data (RiGiBi) in accordance with a chroma coefficient (Csc), thereby to generate a signal of lowered chroma, and it expands the signal into output image data (RoGoBo) of full scale. Besides, the image processing unit (2) generates an image adjustment parameter (Th) and performs a control so as to reduce power of backlight (6), in interlocking with the full-scale expansion.
    Type: Grant
    Filed: June 12, 2008
    Date of Patent: July 23, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Norio Mamba, Naoki Takada, Yasuyuki Kudo, Tsutomu Furuhashi
  • Patent number: 8487901
    Abstract: The display device is provided with X electrodes XP and Y electrodes YP which cross with a first insulating layer in between and a number of Z electrodes which are electrically floating from each other with a second insulating layer in between. The Z electrodes are arranged so that each Z electrode overlaps both an adjacent X electrode and Y electrode. The pad portion of a first X electrode has such a form that the area is maximum in the vicinity of the fine wire portion of the first X electrode and the area is minimum in the vicinity of the fine wire portion of an adjacent second X electrode, and the area of the pad portion is smaller towards the direction in which the distance increases away from the vicinity of the fine wire portion of the first X electrode. A pulse signal is sequentially applied to one set of X electrodes or Y electrodes.
    Type: Grant
    Filed: November 24, 2009
    Date of Patent: July 16, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Kouji Hayakawa, Koji Nagata, Norio Mamba, Toshiyuki Kumagai, Shinji Sekiguchi, Kouichi Anno, Tsutomu Furuhashi
  • Patent number: 8314761
    Abstract: A processing portion for conversion from RGB to RGBW includes a W generating circuit, a sub-pixel rendering circuit, a W intensity calculating portion which transmits a W intensity setting value to a W generating circuit, and a low power backlight control circuit which expands data on the basis of the RGBW pixels generated by the sub-pixel rendering portion and lowers the backlight in accordance with the amount by which the data is expanded. The inputted RGB data is used as the RGBW data with the W intensity calculated by the W intensity calculating portion. A backlight control signal is generated based on the amount of data expansion in the sub-pixel rendering portion. Deterioration (darkness) of image quality due to a reduction in the brightness of a single color as a result of the conversion from RGB pixels to RGBW pixels is prevented and a reduction in the power is achieved.
    Type: Grant
    Filed: June 15, 2012
    Date of Patent: November 20, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Naoki Takada, Yasuyuki Kudo, Yoshiki Kurokawa, Norio Mamba, Shinichi Komura
  • Patent number: 8284171
    Abstract: In a liquid crystal display device having a built-in capacitive coupling touch sensor, a pair of facing transparent substrates sandwich a liquid crystal layer 113 and a liquid crystal display circuit for driving liquid crystal using a lateral electrical field having a color filter layer 107 is formed on one of the transparent substrates 101 in order to make the touch sensor highly sensitive to change in the capacitance, and a capacitive coupling touch sensor circuit layer 117 is formed on the other substrate 116, on the side opposite to the liquid crystal.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: October 9, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Displays Co., Ltd.
    Inventors: Jun Tanaka, Shinji Sekiguchi, Norio Mamba
  • Publication number: 20120249613
    Abstract: A processing portion for conversion from RGB to RGBW includes a W generating circuit, a sub-pixel rendering circuit, a W intensity calculating portion which transmits a W intensity setting value to a W generating circuit, and a low power backlight control circuit which expands data on the basis of the RGBW pixels generated by the sub-pixel rendering portion and lowers the backlight in accordance with the amount by which the data is expanded. The inputted RGB data is used as the RGBW data with the W intensity calculated by the W intensity calculating portion. A backlight control signal is generated based on the amount of data expansion in the sub-pixel rendering portion. Deterioration (darkness) of image quality due to a reduction in the brightness of a single color as a result of the conversion from RGB pixels to RGBW pixels is prevented and a reduction in the power is achieved.
    Type: Application
    Filed: June 15, 2012
    Publication date: October 4, 2012
    Inventors: Naoki TAKADA, Yasuyuki Kudo, Yoshiki Kurokawa, Norio Mamba, Shinichi Komura
  • Patent number: 8232944
    Abstract: The deterioration (darkness) of image quality due to a reduction in the brightness of a single color as a result of the conversion from RGB pixels to RGBW pixels is prevented and a reduction in the power is achieved. A processing portion for conversion from RGB to RGBW 106 is formed of a W generating circuit 201, which is the same as in the prior art, a sub-pixel rendering circuit 202, a W intensity calculating portion 203 which transmits a W intensity setting value 205 to a W generating circuit 201, and a low power backlight control circuit 204 which expands data on the basis of the RGBW pixels generated by the sub-pixel rendering portion 202 and lowers the backlight in accordance with the amount by which the data is expanded. The inputted RGB data is used as the RGBW data with the W intensity calculated by the W intensity calculating portion 203. A backlight control signal is generated in accordance with the amount of data expansion in the sub-pixel rendering portion 202.
    Type: Grant
    Filed: January 14, 2009
    Date of Patent: July 31, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Naoki Takada, Yasuyuki Kudo, Yoshiki Kurokawa, Norio Mamba, Shinichi Komura
  • Patent number: 8212801
    Abstract: The present invention provides a display device which is used in a miniaturized portable information device, wherein the display device requires a small mounting area for a driving circuit thus realizing free mounting of the driving circuit and also can perform driving thereof with a low-voltage power source such as a battery. In a display device which includes a display panel and a driving circuit on the same substrate, a booster circuit is formed on one side of a display panel together with the driving circuit and is formed by steps substantially equal to steps for pixel transistors. The booster circuit includes a circuit which compensates for the lowering of voltage of a switching element used in the booster circuit attributed to a threshold value of a switching element.
    Type: Grant
    Filed: July 24, 2006
    Date of Patent: July 3, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Toshio Miyazawa, Katsumi Matsumoto, Norio Mamba
  • Publication number: 20120154334
    Abstract: A liquid crystal display device includes a first substrate, a second substrate, and a liquid crystal material sandwiched between the first and second substrate. The second substrate has a touch screen electrode directly on a front-side surface of the second substrate. The first substrate has a wiring line for supplying a position detection voltage. A conductive tape electrically connects between the touch screen electrode and a driver circuit. A polarization plate is disposed above the touch screen electrode.
    Type: Application
    Filed: February 27, 2012
    Publication date: June 21, 2012
    Inventors: Tsutomu Furuhashi, Norio Mamba
  • Patent number: 8199127
    Abstract: A display panel is provided having a capacitive touch panel over a display region, wherein the capacitive touch panel comprises a plurality of X electrodes and a plurality of Y electrodes formed with an insulating layer there between and in a manner to cross each other, each of the X electrodes and the Y electrodes is formed such that a pad portion and a narrow line portion are alternately placed in a direction of extension, and when viewed from top, the pad portion of the X electrode and the pad portion of the Y electrode are placed to not overlap each other and a dummy electrode which is in a floating relationship with the X electrode and the Y electrode is formed between the pad portion of the X electrode and the pad portion of the Y electrode.
    Type: Grant
    Filed: January 14, 2009
    Date of Patent: June 12, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Norio Mamba, Tsutomu Furuhashi, Hideo Sato
  • Publication number: 20120139868
    Abstract: A capacitive touch panel includes a scanning circuit portion for inputting a drive voltage to each scanning electrode sequentially in 1st to n-th sub detection periods, a capacitance detection circuit portion for detecting a capacitance detection signal of the each detecting electrode in the 1st to n-th groups, and a control circuit portion for calculating a capacitance detection signal change amount from the capacitance detection signals of a plurality of the detecting electrodes detected by the capacitance detection circuit portion, and calculating coordinates of a touch position based on the capacitance detection signal change amounts.
    Type: Application
    Filed: November 29, 2011
    Publication date: June 7, 2012
    Inventors: Norio MAMBA, Koji DOI
  • Patent number: 8154498
    Abstract: In a display device using an RGB time division drive system in which RGB data to be supplied to display pixels of three colors RGB are subjected to time-division multiplexing and input to a liquid crystal panel unit, (1) data are input to the liquid crystal panel unit alternately in the order of RGB and BGR every line signal, and a selection signal SC which is in the on-state at a break of one line period is kept in the on-state until the next line period. In addition, (2) over a partial non-display period in partial display, selection signals SA, SB and SC are always in the off-state and an equalize signal EQG is in the on-state.
    Type: Grant
    Filed: October 20, 2006
    Date of Patent: April 10, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Yukari Katayama, Yasuyuki Kudo, Norio Mamba, Toshimitsu Matsudo
  • Patent number: 8144131
    Abstract: Provided is a display device with a touch panel having the cost thereof reduced without a decrease in the transmittance ratio of light. A substrate has a planar transparent conductive film formed on an observer side thereof. The transparent conductive film is used as a transparent electrode of an electrostatic capacitance coupling type touch panel. A position detection pulsating voltage production circuit that inputs a pulsating voltage for position detection, and a coordinate position arithmetic circuit that computes a touched position on the transparent conductive film touched with an observer's finger are included. The transparent conductive film is shaped to have four corners. The position detection pulsating voltage generation circuit applies the position detection pulsating voltage to each of the four corners of the transparent conductive film at different timings.
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: March 27, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Shigeyuki Nishitani, Hideo Sato, Teruaki Saito, Norio Mamba
  • Patent number: 8139037
    Abstract: The invention provides a liquid crystal display device with a touch screen that does not reduce light transmittance but achieves cost reduction. The liquid crystal display device has liquid crystal material sandwiched between a first substrate and a second substrate. The second substrate has a planar transparent conductive layer on the front side. The transparent conductive layer is used as a transparent electrode of the capacitive touch screen. The transparent conductive layer is shaped to have four corners, and alternating voltage for position detection is supplied to each of the four corners.
    Type: Grant
    Filed: November 28, 2007
    Date of Patent: March 20, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Tsutomu Furuhashi, Norio Mamba
  • Patent number: 8130230
    Abstract: Disclosed herein is a display device in which input data is written to a RAM as current frame data and read from the RAM as preceding frame data. Then, the current frame data and the preceding frame data are added up in a correction circuit and the result is subjected to an overdriving processing. After this, the processed (over-driven) data is assumed as current frame corrected data, which is then written to the RAM. The written corrected data is read from the RAM and subjected to a double-speed driving processing.
    Type: Grant
    Filed: April 17, 2008
    Date of Patent: March 6, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Takuya Eriguchi, Norio Mamba, Hiroshi Kurihara
  • Patent number: 8102357
    Abstract: An inverter includes an input inverter having a high-resistance load and a first transistor and an output buffer including second and third transistors coupled in series. A power supply voltage is provided to satisfy an inequality VDD1>VDD2+Vth where VDD1 is the power supply voltage of the input inverter, VDD2 is the power supply voltage of the output buffer, and Vth is the threshold voltage of the transistors. Use of the high-resistance load allows an output waveform to rise and fall quickly, as well as reduces current consumption.
    Type: Grant
    Filed: April 10, 2008
    Date of Patent: January 24, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Hisayoshi Kajiwara, Norio Mamba, Toshio Miyazawa, Masahiro Maki
  • Patent number: 8081168
    Abstract: A detection resolution is improved in a display device that employs an electrostatic capacity coupling type touch panel provided with a transparent conductive film serving as a detection film. A plurality of electrode terminals (102) is provided such that at least three electrode terminals (102) are aligned in each side of a detection transparent conductive film (101). A touch panel control circuit is provided for selecting one of two to four numbers of electrode terminals from among the plurality of electrode terminals (102) of the detection transparent conductive film (101), applying an AC signal provided from a signal source (105) through a current detection resistor (r) (103), and then detecting a current that flows through each of the selected electrode terminals.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: December 20, 2011
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Norio Mamba, Tsutomu Furuhashi, Toshiyuki Kumagai, Masayoshi Kinoshita
  • Patent number: 8072436
    Abstract: A touch sensor (3) comprises a plurality of X-coordinate electrodes, a plurality of Y-coordinate electrodes placed crossing the X-coordinate electrodes with an insulating layer therebetween, a plurality of X-coordinate auxiliary electrodes which are extended from X-coordinate electrodes, and a plurality of Y-coordinate auxiliary electrodes which are extended from Y-coordinate electrodes, the plurality of X and Y-coordinate electrodes being placed in a two-dimensional matrix form on a display surface of a display device (1) for detecting a change of capacitance due to pressing. A detection circuit (4) which detects a change in capacitance of the touch sensor (3), an analog-to-digital converter (5) which converts a detection output of the detection circuit (4) into digital data, a touch panel control circuit (6) which determines a touched coordinate, and a primary control circuit (7) which receives input of touch coordinate data from the touch panel control circuit (6) are provided.
    Type: Grant
    Filed: July 9, 2009
    Date of Patent: December 6, 2011
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Takuya Eriguchi, Yasuyuki Kudo, Norio Mamba, Tsutomu Furuhashi, Hideo Sato
  • Patent number: 8063897
    Abstract: Tonal data of one frame of a video signal is subject to time division into dark subframe tonal data at a low tone and bright subframe tonal data at a high tone to compensate for a lowered luminance in the dark subframe by the bright subframe so as not to change an integrated luminance per one ordinary frame. Subframe tonal data read from a memory is converted into output tonal data constituted of dark subframe tonal data at a low tone and bright subframe tonal data at a high tone, by four arithmetic calculation operations using calculation parameters supplied from a register.
    Type: Grant
    Filed: August 14, 2007
    Date of Patent: November 22, 2011
    Assignee: Hitachi Displays, Ltd.
    Inventors: Norio Mamba, Toshiyuki Kumagai, Tsutomu Furuhashi
  • Patent number: 8031154
    Abstract: A display panel is scanned every two lines during a period of binary writing area in the first half of one frame period in partial display (or in small gradation display) and a steady-state current of an output amplifier for buffering gradation signals supplied to the display panel in a non-scanning period in the second half of one frame period is reduced.
    Type: Grant
    Filed: January 22, 2008
    Date of Patent: October 4, 2011
    Assignee: Hitachi Displays, Ltd.
    Inventors: Norio Mamba, Tsutomu Furuhashi