Patents by Inventor Yi-Cheng Chang
Yi-Cheng Chang 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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Publication number: 20160099709Abstract: A CML latch includes an input stage including input nodes to receive a differential input signal and output nodes to provide a differential intermediate output signal, and a negative output node to provide a negative side of the differential intermediate output signal, a negative resistance stage including an input node connected to a first voltage source and output nodes connected to the output nodes of the input stage, and a latch stage including input nodes connected to the output nodes of the input stage and output nodes to provide a differential output signal. The negative resistance stage increases a current gain of the input stage.Type: ApplicationFiled: October 7, 2014Publication date: April 7, 2016Applicant: FREESCALE SEMICONDUCTOR, INC.Inventor: Kevin Yi Cheng Chang
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Publication number: 20160012001Abstract: A connection interface switching device for multiple portable devices provides a communication channel between an I/O peripheral set and for a plurality of portable devices which are bundled with a default control program installed in the portable devices, and switches among the portable devices to establish a communication channel selected between one portable device and the I/O peripheral set according to a switch instruction generated by the default control program of the portable device. The connection interface switching device includes plural I/O ports, a controller, a memory module, a storage module and an I/O peripheral port, and an origin of the computer signal is controlled and switched to achieve the effect of sharing the same I/O peripheral set among multiple portable devices through the communication channel.Type: ApplicationFiled: July 8, 2014Publication date: January 14, 2016Inventor: YI-CHENG CHANG
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Publication number: 20150062856Abstract: A connection port configuring method and a combined circuit board module mounted with multiple connection ports, characterized in that connection ports are mounted on a first circuit board and a second circuit board; the connection ports each comply with a communication port protocol and send a data at a transmission speed by the communication port protocol; the connection port configuring method involves assigning the connection ports to a high-speed connection port group and a low-speed connection port group according to the transmission speed of each connection port, mounting the connection ports of the high-speed connection port group on the first circuit board, and mounting the connection ports of the low-speed connection port group on the second circuit board. With a connection unit connecting the first circuit board and the second circuit board, the data can be transmitted between the first circuit board and the second circuit board.Type: ApplicationFiled: September 3, 2013Publication date: March 5, 2015Applicant: GOOD WAY TECHNOLOGY CO., LTD.Inventor: YI-CHENG CHANG
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Patent number: 8816782Abstract: A voltage controlled oscillator includes a plurality of serially connected composite gain stages. A composite gain stage includes a transconductance stage and a transimpedance stage. The transconductance stage has first and second current paths from a first power supply voltage terminal to a second power supply voltage terminal. A first variable resistance is coupled between the first and second current paths. The transimpedance stage has a first inverter and a second inverter. The first inverter has an input terminal coupled to the output of the first current path and an output terminal. The second inverter has an input terminal coupled to the output of the second current path, and an output terminal. A second variable resistance is coupled between the input terminal and the output terminal of the first inverter, and a third variable resistance is coupled between the input terminal and the output terminal of the second inverter.Type: GrantFiled: May 10, 2011Date of Patent: August 26, 2014Assignee: Freescale Semiconductor, Inc.Inventor: Yi Cheng Chang
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Patent number: 8680937Abstract: An embodiment of an equalizer includes a voltage-to-current converter and a current-to-voltage converter. The voltage-to-current converter is configured to convert a differential input voltage to a differential current, and includes a differential amplifier with a first transistor and a second transistor, and a first source degeneration circuit coupled between the first transistor and the second transistor. An embodiment of the first source degeneration circuit includes a first resonant circuit. The current-to-voltage converter is coupled to the voltage-to-current converter, and is configured to convert the differential current to a differential output voltage. The current-to-voltage converter includes a first inverter with a first feedback circuit and a second inverter coupled to the first inverter, which includes a second feedback circuit. An embodiment of the first feedback circuit includes a second resonant circuit, and an embodiment of the second feedback circuit includes a third resonant circuit.Type: GrantFiled: November 17, 2010Date of Patent: March 25, 2014Assignee: Freescale Semiconductor, Inc.Inventor: Yi-Cheng Chang
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Publication number: 20120286887Abstract: A voltage controlled oscillator includes a plurality of serially connected composite gain stages. A composite gain stage includes a transconductance stage and a transimpedance stage. The transconductance stage has first and second current paths from a first power supply voltage terminal to a second power supply voltage terminal. A first variable resistance is coupled between the first and second current paths. The transimpedance stage has a first inverter and a second inverter. The first inverter has an input terminal coupled to the output of the first current path and an output terminal. The second inverter has an input terminal coupled to the output of the second current path, and an output terminal. A second variable resistance is coupled between the input terminal and the output terminal of the first inverter, and a third variable resistance is coupled between the input terminal and the output terminal of the second inverter.Type: ApplicationFiled: May 10, 2011Publication date: November 15, 2012Inventor: YI CHENG CHANG
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Patent number: 8294643Abstract: A pixel of display is used in an Organic light emitted diode (OLED) display. Driving Circuit of the OLED display outputs a data current and a scanning signal. The pixel of display includes a switch circuit, a first transistor, a second transistor, a capacitor, a switch and a lighting emitting element. The switch circuit, which is controlled by the scanning signal, includes an input end for receiving the data current. When the scanning signal is enabled, a first and a second ends of the switch circuit respectively output a first and a second currents. The second current charges the capacitor. The voltage between the gate and the source of the first transistor is stored in the capacitor. When the scanning signal is disabled, the switch is turned on. The first and the second transistors respectively output currents corresponding to the cross-voltage of the capacitor to the lighting emitting element.Type: GrantFiled: May 4, 2005Date of Patent: October 23, 2012Assignee: Au Optronics Corp.Inventors: Yi-Cheng Chang, Kuo-Sheng Lee
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Patent number: 8253709Abstract: An electronic device and a method for predicting word input include generating a virtual keyboard comprising a plurality of virtual keys and receiving input letters and searching an English word database according to the input letters. The electronic device and the method further include retrieving the one or more possible words that begin with the input letters, confirming one or more virtual keys corresponding to the retrieved one or more possible words, and displaying the confirmed one or more virtual keys different from other virtual keys.Type: GrantFiled: December 16, 2009Date of Patent: August 28, 2012Assignee: Chi Mei Communication Systems, Inc.Inventors: Han-Zen Chang, Shui-Sheng Lin, Yi-Cheng Chang
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Publication number: 20120121004Abstract: An embodiment of an equalizer includes a voltage-to-current converter and a current-to-voltage converter. The voltage-to-current converter is configured to convert a differential input voltage to a differential current, and includes a differential amplifier with a first transistor and a second transistor, and a first source degeneration circuit coupled between the first transistor and the second transistor. An embodiment of the first source degeneration circuit includes a first resonant circuit. The current-to-voltage converter is coupled to the voltage-to-current converter, and is configured to convert the differential current to a differential output voltage. The current-to-voltage converter includes a first inverter with a first feedback circuit and a second inverter coupled to the first inverter, which includes a second feedback circuit. An embodiment of the first feedback circuit includes a second resonant circuit, and an embodiment of the second feedback circuit includes a third resonant circuit.Type: ApplicationFiled: November 17, 2010Publication date: May 17, 2012Applicant: FREESCALE SEMICONDUCTOR, INC.Inventor: Yi Cheng Chang
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Patent number: 7847774Abstract: A pixel driving circuit of an active matrix organic light emitted diode display is provided with an input first scanning voltage signal and an input displaying voltage signal. The pixel driving circuit comprises a driving thin film transistor (TFT), an organic light emitted diode (OLED), and a capacitor. The capacitor has a first end connected to a gate electrode of the driving TFT to store a potential respect to the displaying voltage signal and having the driving TFT generate a steady current flowing through the OLED. The capacitor has a second end provided with a second scanning voltage signal, which has a level range larger than that of the displaying voltage signal, partially overlapping with the first scanning voltage signal so as to generate a negative bias in the driving TFT.Type: GrantFiled: February 11, 2005Date of Patent: December 7, 2010Assignee: AU Optronics CorporationInventor: Yi-Cheng Chang
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Publication number: 20100277424Abstract: An electronic device and a method for predicting word input include generating a virtual keyboard comprising a plurality of virtual keys and receiving input letters and searching an English word database according to the input letters. The electronic device and the method further include retrieving the one or more possible words that begin with the input letters, confirming one or more virtual keys corresponding to the retrieved one or more possible words, and displaying the confirmed one or more virtual keys different from other virtual keys.Type: ApplicationFiled: December 16, 2009Publication date: November 4, 2010Applicant: CHI MEI COMMUNICATION SYSTEMS, INC.Inventors: HAN-ZEN CHANG, SHUI-SHENG LIN, YI-CHENG CHANG
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Patent number: 7507997Abstract: An organic light-emitting display (OLED) includes a first substrate, a first organic light-emitting pixel area, a first driver, a second substrate, a system circuitry, and a conductive member. The second substrate is opposite to the first substrate. The first organic light-emitting pixel area is defined on the first substrate and is sealed between the first substrate and the second substrate. The first driver disposed on the first substrate is used for driving the first organic light-emitting pixel area to generate images. The system circuitry disposed on the second substrate is for electrically connected to the first driver. The first substrate and the second substrate are electrically connected with each other through the conductive member.Type: GrantFiled: April 27, 2006Date of Patent: March 24, 2009Assignee: AU Optronics Corp.Inventors: Hsin-hung Lee, Yi-cheng Chang
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Patent number: 7439540Abstract: An invention relates to an organic electroluminescent display. The organic electroluminescent display comprises a substrate, a bonding pad, and an FPC (Flexible Print Circuit). The substrate comprises a luminescent surface and a non-luminescent surface. An organic electroluminescent (EL) structure is disposed on the non-luminescent surface to provide the organic EL structure to electrically connect to an outer circuit. The FPC, disposed on the same side of the organic electroluminescent structure, comprises a junction portion and a main portion, in which the main portion connects to the junction portion and electrically connects to the outer circuit. The junction portion is adapted to connect to the bonding pad and the main portion is directly extended to the direction toward the organic electroluminescent structure.Type: GrantFiled: September 14, 2005Date of Patent: October 21, 2008Assignee: AU Optronics Corp.Inventors: Yi-Cheng Chang, Shuo-Hsiu Hu
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Publication number: 20070267863Abstract: A business card includes a front face and a back face, the front face including contact information and days of interest and the back face including a one day per week multi-year calendar defining a plurality of years. In an embodiment, days of interest are printed on the card. A method of printing a business card includes printing contact information on a front face of a card, and printing a one day per week multi-year calendar defining a plurality of years on a back face of the card. A method of promoting a business includes determining a selected day based on the business, printing a card, the card comprising contact information and a one day per week multi-year calendar defining a plurality of years, the day based on the selected day, and distributing the card to a plurality of customers.Type: ApplicationFiled: May 18, 2006Publication date: November 22, 2007Inventor: Yi-Cheng Chang
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Patent number: 7285918Abstract: Organic light emitting diode (OLED) displays and fabrication methods thereof are provided. The OLED display comprises a substrate having a display area and a peripheral area. An array of pixels is disposed in the display area. Column and row control circuits are disposed in the peripheral area. At least one thermal dissipation element is disposed in the peripheral area connecting each pixel.Type: GrantFiled: April 21, 2005Date of Patent: October 23, 2007Assignee: AU Optronics Corp.Inventor: Yi-Cheng Chang
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Publication number: 20070176184Abstract: An organic light-emitting display (OLED) includes a first substrate, a first organic light-emitting pixel area, a first driver, a second substrate, a system circuitry, and a conductive member. The second substrate is opposite to the first substrate. The first organic light-emitting pixel area is defined on the first substrate and is sealed between the first substrate and the second substrate. The first driver disposed on the first substrate is used for driving the first organic light-emitting pixel area to generate images. The system circuitry disposed on the second substrate is for electrically connected to the first driver. The first substrate and the second substrate are electrically connected with each other through the conductive member.Type: ApplicationFiled: April 27, 2006Publication date: August 2, 2007Inventors: Hsin-hung Lee, Yi-cheng Chang
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Patent number: 7205169Abstract: A driving circuit and method for an active matrix organic light emitting diode (AMOLED) display are provided. The driving circuit comprises a power circuit, a linear thermistor, and a pixel circuit. The power circuit provides an equivalent current. The linear thermistor coupled to the power circuit adjusts the equivalent current according to the temperature of the AMOLED display. The pixel circuit coupled to the power circuit comprises a driving transistor and a light emitting device. The driving transistor comprises a first end coupled to the power circuit, and the light emitting device coupled to a second end of the driving transistor is driven by the equivalent current to illuminate.Type: GrantFiled: January 6, 2006Date of Patent: April 17, 2007Assignee: AU Optronics Corp.Inventor: Yi-Cheng Chang
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Patent number: 7138964Abstract: An electroluminescence display device that comprises an array of pixels, an electroluminescence device formed in each of the pixels, a first electrode formed in the electroluminescence device, a second electrode formed in the electroluminescence device, an electroluminescence layer formed in the electroluminescence device between the first and second electrodes to emit light through the first and second electrodes, a plurality of scan drivers to activate the array of pixels, and a control unit to control a scanning sequence of the plurality of scan drivers, the electroluminescence display device further comprising a first mode wherein the array of pixels are activated in a sequence from a first row to a last row, and a second mode wherein the array of pixels are activated in a sequence from the last row to the first row.Type: GrantFiled: December 30, 2003Date of Patent: November 21, 2006Assignee: Au Optronics Corp.Inventors: Chung-Wen Ko, Yi-Cheng Chang
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Publication number: 20060175602Abstract: An invention relates to an organic electroluminescent display. The organic electroluminescent display comprises a substrate, a bonding pad, and an FPC (Flexible Print Circuit). The substrate comprises a luminescent surface and a non-luminescent surface. An organic electroluminescent (EL) structure is disposed on the non-luminescent surface to provide the organic EL structure to electrically connect to an outer circuit. The FPC, disposed on the same side of the organic electroluminescent structure, comprises a junction portion and a main portion, in which the main portion connects to the junction portion and electrically connects to the outer circuit. The junction portion is adapted to connect to the bonding pad and the main portion is directly extended to the direction toward the organic electroluminescent structure.Type: ApplicationFiled: September 14, 2005Publication date: August 10, 2006Inventors: Yi-Cheng Chang, Shuo-Hsiu Hu
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Publication number: 20060160255Abstract: A driving circuit and method for an active matrix organic light emitting diode (AMOLED) display are provided. The driving circuit comprises a power circuit, a linear thermistor, and a pixel circuit. The power circuit provides an equivalent current. The linear thermistor coupled to the power circuit adjusts the equivalent current according to the temperature of the AMOLED display. The pixel circuit coupled to the power circuit comprises a driving transistor and a light emitting device. The driving transistor comprises a first end coupled to the power circuit, and the light emitting device coupled to a second end of the driving transistor is driven by the equivalent current to illuminate.Type: ApplicationFiled: January 6, 2006Publication date: July 20, 2006Inventor: Yi-Cheng Chang