Showing papers by "Jun Koyama published in 2001"
Patent•
13 Feb 2001
TL;DR: In this article, an electro-optical device having a plurality of pixels, including a majority of EL elements, provides a gray-scale display by controlling a period of time at which the plurality of the EL elements emit light in one frame period, and a polarity of an EL driving voltage, which is a difference between the potentials applied to the first and second electrodes, is inverted for each one-frame period.
Abstract: An electro-optical device having a plurality of pixels including a plurality of EL elements, wherein the electro-optical device provides a gray scale display by controlling a period of time at which the plurality of the EL elements emit light in one frame period; the plurality of the EL elements have a first electrode and a second electrode; the first electrode is held at a constant potential; and a potential of the second electrode changes in such a manner that a polarity of an EL driving voltage, which is a difference between the potentials applied to the first and second electrodes, is inverted for each one frame period.
370 citations
Patent•
27 Jul 2001
TL;DR: In this article, a concave or convex pattern is formed intentionally on a insulating film provided in contact with the lower surface of an amorphous silicon film, whereby at least a site is formed in which a metal element for accelerating crystallization can be segregated.
Abstract: The present invention is related to a thin film semiconductor which can be regarded as substantially a single crystal and a semiconductor device comprising an active layer formed by the thin film semiconductor. At least a concave or convex pattern is formed intentionally on a insulating film provided in contact with the lower surface of an amorphous silicon film, whereby at least a site is formed in which a metal element for accelerating crystallization can be segregated. Therefore, a crystal nuclei is selectively formed in a portion where the concave or convex pattern is located, which carries out controlling a crystal diameter. Thus, a crystalline silicon film is obtained. A crystallinity of the crystalline silicon film is improved by the irradiation of a laser light or an intense light having an energy equivalent to that of the laser light, whereby a monodomain region in which no grain boundary substantially exit is formed.
109 citations
Patent•
04 Oct 2001
TL;DR: In this paper, a non-volatile memory comprising a semiconductor active layer provided on an insulating substrate, an anodic oxidized film obtained by anodic oxidation of the floating gate electrode, and a control gate electrode provided in contact with the anodic oxide film was presented.
Abstract: A non-volatile memory comprising a semiconductor active layer provided on an insulating substrate, an insulating film provided on the semiconductor active layer, a floating gate electrode provided on the insulating film, an anodic oxidized film obtained by anodic oxidation of the floating gate electrode, and a control gate electrode provided in contact with the anodic oxidized film, and a semiconductor device, particularly a liquid crystal display device comprising the non-volatile memory.
107 citations
Patent•
16 Mar 2001
TL;DR: In this paper, a highly reliable semiconductor display device is described, which has a channel forming region, an LDD region, and a source region and a drain region in a semiconductor layer, and the LDD regions overlaps with a first gate electrode, sandwiching a gate insulating film.
Abstract: A highly reliable semiconductor display device is provided. The semiconductor display device has a channel forming region, an LDD region, and a source region and a drain region in a semiconductor layer, and the LDD region overlaps with a first gate electrode, sandwiching a gate insulating film.
95 citations
Patent•
29 Jan 2001
TL;DR: In this article, the authors proposed a light, thin and miniaturized contact area sensor, which has an EL element as a light source and a photodiode as a photoelectric converting element.
Abstract: PROBLEM TO BE SOLVED: To provide a light, thin and miniaturized contact area sensor. SOLUTION: Concerning this contact area sensor, each of pixels, the area sensor has, has an EL element as a light source and a photodiode as a photoelectric converting element and the operation of the EL element and the photodiode is controlled by a TFT.
64 citations
Patent•
27 Nov 2001
TL;DR: In this article, the authors describe a method to fabricate the active layer of a semiconductor device by sputtering on the substrate and then forming an amorphous silicon film by low pressure CVD on the silicon oxide film.
Abstract: A semiconductor device includes a substrate having an insulating film on its surface, and ac active layer made of a semiconductive thin film on the substrate surface. The thin film contains a mono-domain region formed of multiple columnar and/or needle-like crystals parallel to the substrate surface without including crystal boundaries therein, allowing the active layer to consist of the mono-domain region only. The insulating film underlying the active layer has a specific surface configuration of an intended pattern in profile, including projections or recesses. To fabricate the active layer, form a silicon oxide film by sputtering on the substrate. Pattern the silicon oxide film providing the surface configuration. Form an amorphous silicon film by low pressure CVD on the silicon oxide film. Retain in the silicon oxide film and/or the amorphous silicon film certain metallic element for acceleration of silicon film to a crystalline silicon film. Then, perform a second heat treatment in the halogen atmosphere forming on the crystalline silicon film a thermal oxide film containing halogen, whereby the crystalline silicon film alters to a mono-domain region.
60 citations
Patent•
16 Apr 2001
TL;DR: In this paper, an active matrix type light-emitting device is used as a display device for a multi-gray scale color display, and an electrical apparatus having the same.
Abstract: PROBLEM TO BE SOLVED: To provide a light-emitting device capable of a clear multi-gray scale color display, and an electrical apparatus having the same. SOLUTION: Influence due to the characteristic variation of a thin film transistor 108 for electric current control is prevented by emitting light of EL element 109 formed in a pixel 104, and performing a gray shades display by a time division driving system for controlling non-emitting light by the time. Besides, an optimum structure corresponding to the performance required by each circuit or element is adopted to a thin film transistor itself formed on a substrate. Thereby, a reliable active matrix type light-emitting device is realized. A reliable and highly efficient electrical apparatus having a good picture quality is manufactured by adopting such an active matrix type light-emitting device as a display device.
42 citations
Patent•
09 Nov 2001
TL;DR: In this article, a light emission device capable of simultaneously satisfying the suppression of the change of a gate voltage due to leakage or the like and the suppressing of the lowering of an opening ratio is presented.
Abstract: PROBLEM TO BE SOLVED: To provide a light emission device capable of simultaneously satisfying the suppressing of the change of a gate voltage due to leakage or the like and the suppressing of the lowering of an opening ratio SOLUTION: In this device, a storage capacitor is formed by the gate electrode of a TFT(thin film transistor) which is had by a pixel, a wiring (connection wiring) which is formed on an activated layer and is connected to the activated layer, an insulation film which is formed on the connection wiring and a wiring (capacitance wiring) which is formed of the insulation film Since the TFT and the storage capacitor can be formed by being overlapped with this constitution, the capacitance value of the storage capacitor can be made large while suppressing the lowering of the opening ratio As a result, since the change of the gate voltage due to the leakage or the like can be suppressed, the change of luminance of OLEDs(organic light emitting diodes) is suppressed and flickering of a screen can be suppressed in analog drive
39 citations
Patent•
07 Feb 2001
TL;DR: In this paper, an image display device operating in response to the input of digital picture signals is provided, in which the occupied area of a signal line driver circuit thereof is reduced, and the parasitic capacitance and resistance of input transmission lines of the digital signal signals are reduced.
Abstract: There is provided an image display device operating in response to the input of digital picture signals, in which the occupied area of a signal line driver circuit thereof is reduced, and the parasitic capacitance and resistance of input transmission lines of the digital picture signals are reduced. The device includes both a unit for directly inputting the digital picture signals to shift registers and for performing series parallel conversion, and a unit for causing n (n is a natural number not less than 2) signal lines to jointly own storage circuits and D/A converter circuits in the signal line driver circuit. One horizontal scan period is divided into n periods, and the storage circuits and the D/A converter circuits perform a processing to signal lines different in each of the divided periods.
38 citations
Patent•
12 Apr 2001
TL;DR: In this article, a plurality of partial image display portions are provided, each of which is formed by at least one signal line driver and at least two scanning line driver circuits, and each part displays a part of one frame of image.
Abstract: A plurality of partial image display portions are provided. Each of the partial image display portions is formed by at least one signal line driver circuits and at least one of scanning line driver circuits. Each partial image display portion displays a part of one frame of image. The whole one frame of image is displayed by all of the partial image display portions.
36 citations
Patent•
14 Feb 2001
TL;DR: In this paper, a memory circuit within a signal line driver circuit is made common among n signal lines (where n is a natural number greater than or equal to 2), and all signal lines can be driven by performing processing with respect to signal lines differing by memory circuit and D/A converter circuit, respectively, during the period of each division.
Abstract: The surface area occupied by a digital type signal line driver circuit in an image display device is large, and this is an impediment to reducing the size of the display device. A memory circuit within a signal line driver circuit is made common among n signal lines (where n is a natural number greater than or equal to 2). One horizontal scan period is divided into n divisions, and all signal lines can be driven by performing processing with respect to signal lines differing by memory circuit and D/A converter circuit, respectively, during the period of each division. It thus becomes possible to make 1/n as many memory circuits and D/A conversion circuits within the signal line driver circuit as in a conventional example.
Patent•
07 Aug 2001
TL;DR: In this paper, an area sensor according to the present invention has a function of displaying an image on a sensor unit using a light-emitting element and a reading function using a photoelectric conversion element.
Abstract: (57) [Problem] To provide a contact area sensor which is lightweight, thin and small. An area sensor according to the present invention has a function of displaying an image on a sensor unit using a light-emitting element and a reading function using a photoelectric conversion element. Therefore, an image read by the sensor unit can be displayed on the sensor unit without newly providing an electronic display on the area sensor. Further, the photoelectric conversion layer of the photodiode of the present invention, The N-type semiconductor layer and the P-type semiconductor layer are formed of a polycrystalline silicon film. At this time, The amorphous silicon film is formed thicker than the polycrystalline silicon film. As a result, the photodiode of the present invention can receive more light.
Patent•
20 Aug 2001
TL;DR: In this paper, a plurality of storage circuits and liquid crystal cells are arranged and digital video signals are stored for every pixel for a still picture, information written to pixels after information is written to the pixels once is the same, so the still picture can continuously be displayed by reading the signals out of the storage circuits without inputting signals by frames.
Abstract: PROBLEM TO BE SOLVED: To suppress the power consumption of a portable information device SOLUTION: In pixels, a plurality of storage circuits and liquid crystal cells are arranged and digital video signals are stored for every pixel For a still picture, information written to the pixels after information is written to the pixels once is the same, so the still picture can continuously be displayed by reading the signals out of the storage circuits without inputting signals by frames Namely, when the still picture is displayed, processing operation for signals of at least one frame is performed and then a source signal line driving circuit can be stopped thereafter, so that the power consumption can greatly be reduced COPYRIGHT: (C)2002,JPO
Patent•
22 Feb 2001
TL;DR: In this article, the authors proposed a means to reduce an area to be occupied in the signal line driving circuit of an image display device corresponding to inputs of digital video signals and to reduce the parasitic capacitance and resistance of input transmission line of the digital video signal.
Abstract: PROBLEM TO BE SOLVED: To reduce an area to be occupied in the signal line driving circuit of an image display device corresponding to inputs of digital video signals and to reduce the parasitic capacitance and resistance of input transmission line of the digital video signal. SOLUTION: Both of a means which inputs directly digital video signals to shift registers respectively and which performs the serial-parallel conversion of the signals and a means shares storage circuits and D/A conversion circuits in the signal line driving circuit with (n) lines (n is a natural number of 2 or more) of signal lines are adopted in this display device. Moreover, one horizontal scanning period is divided into (n) pieces and storage circuits and D/A conversion circuits perform processions respectively with respect to different signal lines in respective divided periods.
Patent•
14 May 2001
TL;DR: In this paper, the authors proposed a light emitting device comprising picture element parts and driving circuits on the same insulating material, all of the picture element and the driving circuits are formed of n-channel type semiconductor elements and the production process is simplified.
Abstract: PROBLEM TO BE SOLVED: To provide a light emitting device in which the picture is bright and which is inexpensive, and an electrical equipment using the same. SOLUTION: In this light emitting device comprising picture element parts and driving circuits on the same insulating material, all of the picture element parts and the driving circuits are formed of n-channel type semiconductor elements and the production process is simplified. As the light emitting elements disposed on the picture element parts are radiated in the direction apart from the insulating material, almost the whole of the picture electrode (which correspond to the negative electrode of EL element) becomes an effective light emitting region, therefore, can be made to be a display region effectively utilizing the area of pixel electrodes. In such a manner, the light emitting device of which picture quality is bright and which is inexpensive, can be obtained. COPYRIGHT: (C)2002,JPO
Patent•
05 Mar 2001
TL;DR: In this paper, a semiconductor layer comprises a channel formation region, an LDD region, and source and drain regions, the LDD regions overlapping a first gate electrode through a gate insulation film.
Abstract: PROBLEM TO BE SOLVED: To provide a reliable semiconductor display. SOLUTION: A semiconductor layer comprises a channel formation region, an LDD region, and source and drain regions, the LDD region overlapping a first gate electrode through a gate insulation film.
Patent•
01 Feb 2001
TL;DR: In this article, a nonvolatile memory that can be integrally formed with other semiconductor devices and can be reduced in size is presented, in which writing/erasing for the memory TFT can be realized at a low voltage.
Abstract: The present invention provides a nonvolatile memory that can be integrally formed with other semiconductor devices and can be reduced in size. A memory TFT, a switching TFT and other peripheral circuits constituting a nonvolatile memory are integrally formed on a substrate by TFTs. The memory TFT and the switching TFT are formed on the same semiconductor active layer, and a semiconductor active layer of the memory TFT is formed thinner than semiconductor active layers of the other TFTs. As a result, a nonvolatile memory that is hardly deteriorated and that can be reduced in size is provided, in which writing/erasing for the memory TFT can be realized at a low voltage.
Patent•
19 Dec 2001
TL;DR: In this paper, a semiconductor device having performance comparable with a MOSFET is provided, which is formed by a crystalline silicon film crystallized by using a metal element for promoting crystallization, and further by carrying out a heat treatment in an atmosphere containing a halogen element to carry out gettering of the metal element.
Abstract: A semiconductor device having performance comparable with a MOSFET is provided. An active layer of the semiconductor device is formed by a crystalline silicon film crystallized by using a metal element for promoting crystallization, and further by carrying out a heat treatment in an atmosphere containing a halogen element to carry out gettering of the metal element. The active layer after this process is constituted by an aggregation of a plurality of needle-shaped or column-shaped crystals. A semiconductor device manufactured by using this crystalline structure has extremely high performance.
Patent•
09 Jul 2001
TL;DR: In this article, the authors proposed a spatial light modulating device, in which display with a high gradation number can be performed using a digital micromirror, first and second electrodes to change the inclination of the micromIRror, a first switching element, a second switching element and an SRAM.
Abstract: PROBLEM TO BE SOLVED: To provide a spatial light modulating device, in which display with a high gradation number can be performed. SOLUTION: The digital micromirror device is equipped with a micromirror, first and second electrodes to change the inclination of the micromirror, a first switching element, a second switching element and an SRAM. The output terminal of the first switching element is connected to the first electrode; the output terminal of the second switching element is connected to the second electrode; the input terminal of the SRAM is connected to the first electrode and the output terminal of the SRAM is connected to the second electrode; and the input voltage and the output voltage of the SRAM differ from each other.
Patent•
31 Jan 2001
TL;DR: In this paper, the memory TFT and the switching TFT are formed on the same semiconductor active layer, and the semiconductor inactive layer is made thinner than the active layer of other TFTs.
Abstract: PROBLEM TO BE SOLVED: To provide a nonvolatile memory which can be formed together with other semiconductor devices and miniaturized. SOLUTION: Memory TFTs forming a nonvolatile memory, switching TFTs and other peripheral circuits composed of TFTs are formed together on a substrate. The memory TFTs and the switching TFTs are formed on the same semiconductor active layer, and the semiconductor active layer of the memory TFTs is made thinner than the semiconductor active layer of other TFTs. Thus, a low-voltage write/erase of the memory TFT can be realized to provide a nonvolatile memory which is hardly deteriorates and miniaturizable. COPYRIGHT: (C)2001,JPO
Patent•
09 May 2001
TL;DR: In this paper, the authors proposed a user authentication system for a mobile information communication unit having a liquid crystal display device, where an image sensor was incorporated in the display device and authenticated the person concerned on the basis of the information.
Abstract: PROBLEM TO BE SOLVED: To provide a user authentication system and method that employ the Internet and a mobile information communication device. SOLUTION: The user authentication system for a mobile information communication unit having a liquid crystal display device reads personal information of a user by an image sensor incorporated in the liquid crystal display device and authenticates the person concerned on the basis of the information. This invention provides the user authentication system that is characterized in that the image sensor reads the personal information of the user, authenticates the user and transmits the result of authentication via the Internet. That is, this invention provides the user authentication system where image sensor reads the personal information of the user, the user is authenticated, and the necessity of transmission of the authentication result is discriminated depending on the necessity set to the mobile information communication unit or a communication destination in advance and the authentication result is transmitted via the Internet only when the transmission is required.
Patent•
17 Jan 2001
TL;DR: In this paper, a display system adjusting emission luminance of light emitting elements included in a light emitting device in accordance with rounding information is presented. But the system is limited to a single display.
Abstract: PROBLEM TO BE SOLVED: To provide a display system adjusting emission luminance of light emitting elements included in a light emitting device in accordance with sur rounding information. SOLUTION: In this system, a sensor 2011 detects surrounding information as an electric signal and a CPU 2013 converts the signal into a correction signal for correcting emission luminance of EL(electroluminescent) elements based on preliminarily set comparison data. When this correction signal is inputted to a voltage varying unit 2010, the unit 2010 applies a prescribed correction potential to the EL elements. Thus, emission luminance of the EL elements 2003 is controlled in this display system. COPYRIGHT: (C)2001,JPO
Patent•
09 May 2001
Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing a liquid crystal display device, with high visibility used for portable information equipment without increasing manufacturing processes. SOLUTION: In the manufacturing process of a reflection type liquid crystal display device used for the display part of the portable information equipment, pixel structures 15, 16 for shading TFTs and between pixels are provided without having to user a black matrix to widen an effective pixel region. To shade between the pixels, a gate wiring and a source wiring 124 are formed on the same insulating film, and the pixel electrode 158 is placed, so as to overlap the gate wiring or the source wiring. COPYRIGHT: (C)2002,JPO
Patent•
26 Apr 2001
TL;DR: In this article, a portable communication device is connected to the Internet after the inputted biological information of the user and the reference biological information have matched, and information that the inputting biological information and reference information have been matched is transmitted to a server from the portable communication devices.
Abstract: An individual may be identified by using a portable communication device. Biological information of the user is input into the communication device. The inputted biological information of the user is checked with reference biological information previously stored in the portable communication device. The portable communication device is connected to the Internet after the inputted biological information of the user and the reference biological information have matched. Then information that the inputted biological information of the user and the reference biological information have matched is transmitted to a server from the portable communication device.
Patent•
15 Aug 2001
TL;DR: In this article, a driving circuit of a liquid crystal display device including a first insulating substrate on which a plurality of signal lines and scan lines are disposed, and pixel transistors made of thin film transistors are disposed in matrix at intersection points of those lines, is presented.
Abstract: A driving circuit of a liquid crystal display device including a first insulating substrate on which a plurality of signal lines and a plurality of scan lines are disposed, and pixel transistors made of thin film transistors are disposed in matrix at intersection points of those lines; a second insulating substrate opposite to the first insulating substrate; and a liquid crystal held between the first and second insulating substrates, in which the driving circuit is disposed on the first insulating substrate; each of clock lines or base portions of the clock lines for supplying clock signals to the driving circuit is made of a two-layer structure of the same wiring material as a gate electrode of the thin film transistor and the same wiring material as a source electrode or drain electrode of the thin film transistor; and a wiring line crossing the clock lines or the base portions of the clock lines is made of a wiring line in the same layer as a black matrix covering the pixel transistors.
Patent•
12 Apr 2001
TL;DR: In this article, a plurality of partial image display portions are provided, each of which is formed by at least one signal line driver and at least two scanning line driver circuits, and each part displays a part of one frame of image.
Abstract: A plurality of partial image display portions are provided. Each of the partial image display portions is formed by at least one signal line driver circuits and at least one of scanning line driver circuits. Each partial image display portion displays a part of one frame of image. The whole one frame of image is displayed by all of the partial image display portions.
Patent•
26 Apr 2001
TL;DR: In this paper, a system for identifying an individual by which can be easily made, comprising: a means for storing (605) the genomic information of the client; a means of reading the biological information (611); and a mean for checking (612) the read biological information with the stored genomic information; and a means to transmitting information (601,602,603) to a server in a communication system that they have matched in the case where the checking has matched.
Abstract: The present invention provides a system for identifying an individual by which
identification of a client can be easily made, comprising: a means for storing (605) the
biological information of the client; a means for reading the biological information
of the client (611); a means for checking (612) the read biological information with the stored
biological information; and a means for transmitting information (601,602,603) to a server in a communication system that
they have matched in the case where the checking has matched.
Patent•
26 Apr 2001
Patent•
30 Mar 2001
TL;DR: In this paper, a short side or one by n the mother glass is made as an one side of the glass substrate consequently to reduce waste generating when cutting out of a glass substrate for a display.
Abstract: PROBLEM TO BE SOLVED: To make an effective utilization of mother glass from which a glass substrate is cut out into a glass substrate for a display. SOLUTION: A short side or one by n the mother glass is made as an one side of the glass substrate consequently to reduce waste generating when cutting out of the glass substrate.