Patents by Inventor Wei-Chieh Hsueh
Wei-Chieh Hsueh 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).
-
Publication number: 20240079524Abstract: A semiconductor device comprises a first semiconductor structure, a second semiconductor structure located on the first semiconductor structure, and an active layer located between the first semiconductor structure and the second semiconductor structure. The first semiconductor structure has a first conductivity type, and includes a plurality of first layers and a plurality of second layers alternately stacked. The second semiconductor structure has a second conductivity type opposite to the first conductivity type. The plurality of first layers and the plurality of second layers include indium and phosphorus, and the plurality of first layers and the plurality of second layers respectively have a first indium atomic percentage and a second indium atomic percentage. The second indium atomic percentage is different from the first indium atomic percentage.Type: ApplicationFiled: September 6, 2023Publication date: March 7, 2024Inventors: Wei-Jen HSUEH, Shih-Chang LEE, Kuo-Feng HUANG, Wen-Luh LIAO, Jiong-Chaso SU, Yi-Chieh LIN, Hsuan-Le LIN
-
Patent number: 10334671Abstract: A backlight device and a dimming control method thereof are provided. The method includes the following steps: supplying power to a plurality of light strips and a plurality of first switch components; storing an initial pulse signal in a pulse storage circuit; determining whether or not a frequency of the initial pulse signal is smaller than a frequency threshold by a pulse modulation control circuit, and if yes, outputting a pulse width modulation control signal and a voltage adjusting control signal; adjusting a pulse width of the initial pulse signal according to the pulse width modulation control signal to output a pulse width modulation signal to each of the first switch components by a pulse generator circuit; and outputting a voltage adjusting signal to each of the first switch components according to an adjustment ratio of the initial pulse signal to the pulse width modulation signal.Type: GrantFiled: December 21, 2018Date of Patent: June 25, 2019Assignee: ANPEC ELECTRONICS CORPORATIONInventor: Wei-Chieh Hsueh
-
Patent number: 10034341Abstract: An adaptive backlight device includes a transistor, a voltage detector and an adaptive controller. The transistor is configured to control the current flowing through a light string. The transistor provides a first voltage signal and a second voltage signal. The voltage detector generates a voltage difference signal according to the first voltage signal and the second voltage signal. The adaptive controller receives the voltage difference signal from the voltage detector. The adaptive controller includes a counter. When the adaptive controller determines that the voltage difference signal is larger than or equal to a predetermined value, the adaptive controller increases the current flowing through the light string at least once via the control end of the transistor to increase the cross voltage of the light string and decrease the cross voltage of the transistor.Type: GrantFiled: January 19, 2018Date of Patent: July 24, 2018Assignee: ANPEC ELECTRONICS CORPORATIONInventor: Wei-Chieh Hsueh
-
Patent number: 9577853Abstract: The present disclosure illustrates a current balance method and a current balance circuit thereof. The current balance method is used in a multiphase digital pulse width modulator. Steps of the current balance method are as follows. A plurality of pulse width values of the pulse width modulated signals within a first period are recorded, and a minimum pulse width value is defined as a standard value. The method determines whether each pulse width value is larger than the sum of the standard value and a pulse width threshold, and if yes, the method adds 1 to a count value of the phase output stage corresponding to the pulse width value. The method determines whether each count value equals to a counting threshold, and if yes, the method adjusts the pulse width modulated signal, and initializing the count value as 0.Type: GrantFiled: November 5, 2015Date of Patent: February 21, 2017Assignee: ANPEC ELECTRONICS CORPORATIONInventor: Wei-Chieh Hsueh
-
Publication number: 20170048090Abstract: The present disclosure illustrates a current balance method and a current balance circuit thereof. The current balance method is used in a multiphase digital pulse width modulator. Steps of the current balance method are as follows. A plurality of pulse width values of the pulse width modulated signals within a first period are recorded, and a minimum pulse width value is defined as a standard value. The method determines whether each pulse width value is larger than the sum of the standard value and a pulse width threshold, and if yes, the method adds 1 to a count value of the phase output stage corresponding to the pulse width value. The method determines whether each count value equals to a counting threshold, and if yes, the method adjusts the pulse width modulated signal, and initializing the count value as 0.Type: ApplicationFiled: November 5, 2015Publication date: February 16, 2017Inventor: WEI-CHIEH HSUEH
-
Patent number: 8373685Abstract: Driving methods for display panels are provided, in which a Kth row of pixels in a pixel array is driven during a first period, and a K+1th row of pixels in the pixel array is driven during a second period. A control clock applied for a charge pump is toggled at least N times during a third period between the first and second periods, and the control clock is maintained at a fixed logic level during the first and second periods, in which N?2.Type: GrantFiled: October 24, 2007Date of Patent: February 12, 2013Assignee: Wisepal Technologies, Inc.Inventor: Wei-Chieh Hsueh
-
Patent number: 7808465Abstract: A gamma voltage generator generating a plurality of gamma voltages transformed into a plurality of data signals by a processing unit is disclosed. The processing unit outputs the data signals according to a color separation method. The gamma voltage generator comprises a setting unit, a resistor string, and a selection unit. The setting unit provides a first parameter, a second parameter, and a third parameter. The resistor string generates the gamma voltages according to the first, second, or third parameter. The selection unit is coupled between the setting unit and the resistor string for outputting the first, second, or third parameter to the resistor string according to a control signal group.Type: GrantFiled: October 23, 2006Date of Patent: October 5, 2010Assignee: Wisepal Technologies, Inc.Inventor: Wei-Chieh Hsueh
-
Patent number: 7538489Abstract: A full-color active matrix organic electroluminescent device and fabrication method thereof. The full-color active matrix organic electroluminescent device includes a substrate with a plurality of TFTs, a buffer layer formed on the substrate beyond the TFTs, a color filter formed on the buffer layer, a flat layer formed on the entire surface of the color filter, a first electrode formed on the flat layer, an organic electroluminescent layer formed on the first electrode, and a second electrode formed on the organic electroluminescent layer, wherein the flat layer is formed by a low temperature thin film process.Type: GrantFiled: November 10, 2005Date of Patent: May 26, 2009Assignee: TPO Displays Corp.Inventors: Yaw-Ming Tsai, Wei-Chieh Hsueh
-
Publication number: 20080100600Abstract: Driving methods for display panels are provided, in which a Kth row of pixels in a pixel array is driven during a first period, and a K+1th row of pixels in the pixel array is driven during a second period. A control clock applied for a charge pump is toggled at least N times during a third period between the first and second periods, and the control clock is maintained at a fixed logic level during the first and second periods, in which N?2.Type: ApplicationFiled: October 24, 2007Publication date: May 1, 2008Applicant: WISEPAL TECHNOLOGIES, INC.Inventor: Wei-Chieh HSUEH
-
Publication number: 20080030444Abstract: A gamma voltage generator generating a plurality of gamma voltages transformed into a plurality of data signals by a processing unit is disclosed. The processing unit outputs the data signals according to a color separation method. The gamma voltage generator comprises a setting unit, a resistor string, and a selection unit. The setting unit provides a first parameter, a second parameter, and a third parameter. The resistor string generates the gamma voltages according to the first, second, or third parameter. The selection unit is coupled between the setting unit and the resistor string for outputting the first, second, or third parameter to the resistor string according to a control signal group.Type: ApplicationFiled: October 23, 2006Publication date: February 7, 2008Applicant: WISEPAL TECHNOLOGIES, INC.Inventor: Wei-Chieh Hsueh
-
Patent number: 7319447Abstract: A pixel driving circuit for use in an active matrix electron luminescent display includes a transistor, a capacitor and an organic light-emitting diode. The capacitor has a first and a second ends coupled to the gate electrode of the transistor and a ground voltage, respectively. The organic light-emitting diode has a P and an N electrode coupled to the source electrode of the transistor and the ground voltage, respectively. The capacitor is charged by a driving current received from a data line to generate a specified voltage to bias the transistor and the organic light-emitting diode in the memorizing state, and the transistor and the organic light-emitting diode are further biased with the specified voltage in the emission state.Type: GrantFiled: February 11, 2004Date of Patent: January 15, 2008Assignee: TPO Displays Corp.Inventor: Wei-Chieh Hsueh
-
Patent number: 7317435Abstract: A pixel driving circuit for use in an active matrix organic light-emitting diode with threshold voltage compensation includes a transistor, a first capacitor and a second capacitor. The organic light-emitting diode is in communication with the transistor. The first capacitor has a first and a second ends, wherein the first end is coupled to a gate electrode of the transistor. The second capacitor has a third and a fourth ends coupled to the second end of the first capacitor and a ground voltage, respectively. A threshold voltage of the transistor is stored in the first capacitor in a first state, a driving voltage received from a data line is stored in the second capacitor in a second state, and the gate electrode of the transistor is biased with a specified voltage applied to the first and the second capacitors interconnected in series in a third state. A current passing through the organic light-emitting diode is controlled accordingly.Type: GrantFiled: May 10, 2004Date of Patent: January 8, 2008Assignee: TPO Displays Corp.Inventor: Wei-Chieh Hsueh
-
Patent number: 7183700Abstract: An organic light emitting diode (OLED) display includes a substrate defined with a plurality of pixel areas, a heating circuit structure disposed on the substrate, and a plurality of OLEDs corresponding to each pixel area. The heating circuit structure includes two conductive lines not connected to each other, a plurality of heating lines electrically connected to the two conductive lines and covering portions of each pixel areas, and a ground electrode.Type: GrantFiled: August 18, 2004Date of Patent: February 27, 2007Assignee: TPO Displays Corp.Inventors: Wen-Yuan Guo, Wei-Chieh Hsueh, An Shih, Shih-Chang Chang
-
Publication number: 20060097275Abstract: A full-color active matrix organic electroluminescent device and fabrication method thereof. The full-color active matrix organic electroluminescent device includes a substrate with a plurality of TFTs, a buffer layer formed on the substrate beyond the TFTs, a color filter formed on the buffer layer, a flat layer formed on the entire surface of the color filter, a first electrode formed on the flat layer, an organic electroluminescent layer formed on the first electrode, and a second electrode formed on the organic electroluminescent layer, wherein the flat layer is formed by a low temperature thin film process.Type: ApplicationFiled: November 10, 2005Publication date: May 11, 2006Inventors: Yaw-Ming Tsai, Wei-Chieh Hsueh
-
Publication number: 20060001614Abstract: The present invention provides an apparatus for refreshing a voltage data in a display pixel circuit and an organic light emitting diode display using the same. The voltage data is stored in a capacitor of the display pixel circuit. The apparatus includes a data refreshing circuit. The data refreshing circuit includes a voltage transmission terminal coupled to the capacitor, and a first input terminal for inputting a first control signal to control timing and/or period for reading and/or writing the voltage data.Type: ApplicationFiled: July 2, 2004Publication date: January 5, 2006Inventors: Wei-Chieh Hsueh, An Shih, Yaw-Ming Tsai
-
Patent number: 6961012Abstract: The data-line driver circuit receives data currents from an external signal source and drives the pixel group of electro-luminescence display device. The data-line driver circuit has a first circuit group, a second circuit group and a shift register. The shift register controls the first circuit group to receive the data currents and controls the second circuit group to duplicate the data currents and then send them to the pixel group.Type: GrantFiled: April 8, 2004Date of Patent: November 1, 2005Assignee: Toppoly Optoelectronics Corp.Inventor: Wei-Chieh Hsueh
-
Publication number: 20050225251Abstract: A pixel structure and its driving method, which are used in the active matrix organic illuminated displays, are described. The pixel structure has four transistors, a capacitor and three signal lines. The first and second transistors are used as the switching transistors and controlled by the first and second scan lines, respectively. The third and fourth transistors together constitute a current mirror to equalize the current flows through the OLED in each pixel and the writing in current in the data line. Therefore, the illumination of the OLED between each pixel will be more uniform and is not influenced by the threshold voltage.Type: ApplicationFiled: November 29, 2004Publication date: October 13, 2005Inventor: Wei-Chieh Hsueh
-
Publication number: 20050189535Abstract: An organic light-emitting device and method of fabricating the same. A substrate is provided. A first electrode is formed on the substrate. A light-emitting layer is disposed on the first electrode, and a second electrode is disposed on the light-emitting layer, wherein the first and second electrodes define a pixel area corresponding to an active light emitting area of the light-emitting layer. A light-shielding pattern is defined around the active light emitting area, to block stray light emitted by the light emitting-layer outside the active light emitting area.Type: ApplicationFiled: October 21, 2004Publication date: September 1, 2005Inventors: Wei-Chieh Hsueh, Yaw-Ming Tsai
-
Publication number: 20050140273Abstract: An organic light emitting diode (OLED) display includes a substrate defined with a plurality of pixel areas, a heating circuit structure disposed on the substrate, and a plurality of OLEDs corresponding to each pixel area. The heating circuit structure includes two conductive lines not connected to each other, a plurality of heating lines electrically connected to the two conductive lines and covering portions of each pixel areas, and a ground electrode.Type: ApplicationFiled: August 18, 2004Publication date: June 30, 2005Inventors: Wen-Yuan Guo, Wei-Chieh Hsueh, An Shih, Shih-Chang Chang
-
Publication number: 20050052377Abstract: A pixel driving circuit for use in an active matrix organic light-emitting diode with threshold voltage compensation includes a transistor, a first capacitor and a second capacitor. The organic light-emitting diode is in communication with the transistor. The first capacitor has a first and a second ends, wherein the first end is coupled to a gate electrode of the transistor. The second capacitor has a third and a fourth ends coupled to the second end of the first capacitor and a ground voltage, respectively. A threshold voltage of the transistor is stored in the first capacitor in a first state, a driving voltage received from a data line is stored in the second capacitor in a second state, and the gate electrode of the transistor is biased with a specified voltage applied to the first and the second capacitors interconnected in series in a third state. A current passing through the organic light-emitting diode is controlled accordingly.Type: ApplicationFiled: May 10, 2004Publication date: March 10, 2005Inventor: Wei-Chieh Hsueh