Patents by Inventor Shwang-Shi Bai
Shwang-Shi Bai 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: 20080297499Abstract: An LCD (liquid crystal display) power supply includes an AC to DC converter circuit, a transformer, a DC to AC converter, and a feedback circuit. The AC to DC converter circuit couples an AC power supply to generate a DC signal. The DC to AC converter couples the DC signal to a primary side of the transformer and alternates polarities thereof so that an AC signal is generated on a secondary side of the transformer to supply for a load. The feedback circuit receives a first feedback signal indicative of power being supplied to the load and modulates the DC signal generated by the AC to DC converter circuit according to the first feedback signal.Type: ApplicationFiled: May 30, 2007Publication date: December 4, 2008Applicant: HIMAX TECHNOLOGIES LIMITEDInventors: Shu-Ming CHANG, Shwang-Shi BAI, Shen-Yao LIANG
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Publication number: 20080265791Abstract: A backlight module and a current providing circuit thereof are provided. The current providing circuit includes a signal generating unit, a switching unit, a first capacitor, a transformer and an output node. The signal generating unit generates a PWM signal according to a level of a power source. The switching unit determines whether a first signal end and a second signal end of the switching unit are conducted according to the PWM signal received by a control end of the switching unit. Following a switch performed by the switching unit, the first capacitor charges and discharges through a current path provided by a primary coil of the transformer. Thereby, a secondary coil of the transformer generates a corresponding AC voltage by sensing a current change in the primary coil and outputs the AC voltage through the output node.Type: ApplicationFiled: March 13, 2008Publication date: October 30, 2008Applicant: HIMAX TECHNOLOGIES LIMITEDInventors: Shwang-Shi Bai, Hsiu-Na Hsieh, Shu-Ming Chang
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Patent number: 7429835Abstract: A backlight driver circuit has a transformer, a switching circuit and a plurality of switch devices. The switching circuit couples a DC voltage to a primary side of the transformer and alternates polarities thereof so that an AC voltage is generated on a secondary side of the transformer to turn on the backlight blocks. The switch devices are respectively connected between one of the backlight blocks and the transformer, and the AC voltage turns the backlight blocks on when the switch devices are turned on.Type: GrantFiled: August 24, 2006Date of Patent: September 30, 2008Assignee: Himax Technologies LimitedInventors: Shu-Ming Chang, Yu-Pei Huang, Shen-Yao Liang, Shwang-Shi Bai
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Publication number: 20080068203Abstract: The present invention is directed to an apparatus that drives a lighting system with multiple lamps. A phase shift mechanism is produced either by a digital method, an analog method, or a mixture of the two methods. In a digital method, phase shifts are generated by digital circuits comprising counters, a divider, an adder, and a comparator. The digital circuits analyze the signal and use the necessary information to form a series of phased driving signals. In an analog method, phase shifts are generated by analog circuits comprising ramp waveform generators, comparators, and at least one shot generator. Also, an apparatus for driving a lighting system with multiple lamps can be realized by mixing the two methods mentioned above.Type: ApplicationFiled: September 18, 2006Publication date: March 20, 2008Applicant: HIMAX TECHNOLOGIES LIMITEDInventors: Shwang-Shi Bai, Yu-Pei Huang, Shen-Yao Liang
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Publication number: 20080061705Abstract: A power supply circuit for transforming a direct-current voltage into an alternating-current voltage for a light source is provided. The power supply circuit includes a drive circuit, a switch, a transformer and a capacitor. The switch has a control terminal coupled to the drive circuit and a ground terminal coupled to a ground. The transformer has a primary side and a secondary side, and a winding on the primary side is coupled between the direct-current voltage and a signal terminal of the switch to generate the alternating-current voltage on the secondary side. The capacitor is coupled between the ground terminal and the signal terminal of the switch.Type: ApplicationFiled: September 5, 2007Publication date: March 13, 2008Applicant: HIMAX TECHNOLOGIES LIMITEDInventors: Shwang-Shi Bai, Hsiu-Na Hsieh, Shu-Ming Chang
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Publication number: 20070290624Abstract: The invention is a driving apparatus and circuit for efficiently converting a direct current (DC) signal into an alternating current (AC) signal to drive a fluorescent lamp. A semi class E configuration which utilizes only one transistor is employed in the invention. The invention comprises a power transistor, a transformer wherein a primary winding is used as a load for the power transistor and a secondary winding is used to transfer energy to the load for the driving apparatus, i.e. the CCFL tube, and control means which extracts the frequency and current of the power transistor and corrects the deviation between the frequency of the power transistor and that of the control means.Type: ApplicationFiled: June 15, 2006Publication date: December 20, 2007Applicant: HIMAX TECHNOLOGIES, INC.Inventors: Shwang-Shi Bai, Yu-Pei Huang, Shen-Yao Liang, Shu-Ming Chang
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Publication number: 20070268238Abstract: An image-displaying control circuit used in a scan-backlight LCD is disclosed. The image-displaying control circuit comprises a driver control circuit, a plurality of gate driver groups, a backlight control circuit and a plurality of backlight driver groups. Each of the gate driver groups is used to drive one of the display blocks, and the driver control circuit outputs a gate sequence signal to the gate driver groups. The gate drive groups can respectively drive the display blocks in a driving sequence according to the gate sequence signal. The backlight driver groups controlled by the backlight control circuit are respectively used to turn on one of the backlight blocks, and the driver control circuit outputs a backlight sequence signal to the backlight control circuit. Then, the backlight control circuit can control the backlight driver groups to respectively turn on the backlight blocks in the same driving sequence as the display blocks.Type: ApplicationFiled: May 22, 2006Publication date: November 22, 2007Applicant: HIMAX TECHNOLOGIES, INC.Inventors: Shu-Ming Chang, Yu-Pei Huang, Shen-Yao Liang, Shwang-Shi Bai, Ying-Chou Tu
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Patent number: 7291993Abstract: A method for driving a fluorescent lamp and an inverter circuit for performing the same are used to reduce an amount of electromagnetic interference (EMI) generated by a transformer and an instantaneous loading of a DC voltage source. The inverter circuit comprises a DC square wave voltage source, a bridge DC/AC converter, a transformer, a feedback control unit and a voltage control circuit wherein the voltage control circuit is coupled to the DC voltage source, the bridge DC/AC converter and the feedback control unit. The voltage control circuit is used to convert DC voltage provided by the DC voltage source into a two-level DC square wave, which in turn converts the two-level DC square wave into an AC quasi-sine wave to drive the fluorescent lamp through the bridge DC/AC converter and the transformer. The feedback control unit generates signals to control the voltage control circuit and the bridge DC/AC converter.Type: GrantFiled: January 17, 2007Date of Patent: November 6, 2007Assignee: Himax Technologies, Inc.Inventors: Shwang-Shi Bai, Yu-Pei Huang
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Patent number: 7262562Abstract: A method for driving a fluorescent lamp and an inverter circuit for performing the same are used to reduce an amount of electromagnetic interference (EMI) generated by a transformer and an instantaneous loading of a DC voltage source. The inverter circuit comprises a DC square wave voltage source, a bridge DC/AC converter, a transformer, a feedback control unit and a voltage control circuit wherein the voltage control circuit is coupled to the DC voltage source, the bridge DC/AC converter and the feedback control unit. The voltage control circuit is used to convert DC voltage provided by the DC voltage source into a two-level DC square wave, which in turn converts the two-level DC square wave into an AC quasi-sine wave to drive the fluorescent lamp through the bridge DC/AC converter and the transformer. The feedback control unit generates signals to control the voltage control circuit and the bridge DC/AC converter.Type: GrantFiled: August 4, 2005Date of Patent: August 28, 2007Assignee: Himax Technologies, Inc.Inventors: Shwang-Shi Bai, Yu-Pei Huang
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Publication number: 20070182697Abstract: A backlight driver circuit has a transformer, a switching circuit and a plurality of switch devices. The switching circuit couples a DC voltage to a primary side of the transformer and alternates polarities thereof so that an AC voltage is generated on a secondary side of the transformer to turn on the backlight blocks. The switch devices are respectively connected between one of the backlight blocks and the transformer, and the AC voltage turns the backlight blocks on when the switch devices are turned on.Type: ApplicationFiled: August 24, 2006Publication date: August 9, 2007Applicant: HIMAX TECHNOLOGIES, INC.Inventors: Shu-Ming Chang, Yu-Pei Huang, Shen-Yao Liang, Shwang-Shi Bai
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Publication number: 20070164978Abstract: The display apparatus has several display blocks. The display blocks are driven in a first sequence during a first frame period. The display blocks are driven in a second sequence during a second frame period immediately following the first frame period. The display block driven last in the first sequence is driven first in the second sequence, and an order of each of the other display blocks in the second sequence is higher than that in the first sequence by one.Type: ApplicationFiled: July 25, 2006Publication date: July 19, 2007Applicant: HIMAX TECHNOLOGIES, INC.Inventors: Shu-Ming Chang, Yu-Pei Huang, Shen-Yao Liang, Shwang-Shi Bai
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Publication number: 20070159114Abstract: An inverter has an inductor, a capacitor, a switching device, a driving circuit and a transformer. A first terminal of the capacitor is connected to the inductor, and the switching device is connected between the first terminal of the capacitor and a ground terminal. The driving circuit is connected to the switching device, wherein the driving circuit is arranged to control the switching device to turn on or turn off; and a primary side of the transformer is connected between a second terminal of the capacitor and the ground terminal.Type: ApplicationFiled: May 9, 2006Publication date: July 12, 2007Applicant: HIMAX TECHNOLOGIES, INC.Inventors: Shu-Ming Chang, Yu-Pei Huang, Shen-Yao Liang, Shwang-Shi Bai
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Publication number: 20070159112Abstract: A lamp driving device has a pulse width modulation circuit, a phase splitter and several switching circuits. The pulse width modulation circuit is arranged to generate a pulse width modulation signal. The phase splitter is coupled to the pulse width modulation circuit and arranged to split the pulse width modulation signal into several phased signals having different phases, wherein pulses of each phased signal are non-overlapping with those of another phased signal. The switching circuits are coupled to the phase splitter and are arranged to respectively receive one of the phased signals, wherein each switching circuit is controlled by the received phased signal.Type: ApplicationFiled: July 13, 2006Publication date: July 12, 2007Applicant: HIMAX TECHNOLOGIES, INC.Inventors: Shu-Ming Chang, Yu-Pei Huang, Shen-Yao Liang, Shwang-Shi Bai
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Publication number: 20070120807Abstract: Disclosed is a backlight control system for a display system with motion picture quality improvement and dynamic luminance control. In the backlight control system, a dynamic motion picture detector outputs an enable signal and a luminance control signal by judging whether the input video data are dynamic motion pictures or not. In response to the enable signal, a display quality improvement mechanism decides whether or not to trigger a display quality improvement. In case of the display quality improvement being triggered, a luminance control circuit and/or an inverter make a backlight module of the display system emit stronger lights for luminance compensation.Type: ApplicationFiled: November 28, 2005Publication date: May 31, 2007Inventors: Shwang-Shi Bai, Yu-Pei Huang, Shen-Yao Liang
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Publication number: 20070120504Abstract: A method for driving a fluorescent lamp and an inverter circuit for performing the same are used to reduce an amount of electromagnetic interference (EMI) generated by a transformer and an instantaneous loading of a DC voltage source. The inverter circuit comprises a DC square wave voltage source, a bridge DC/AC converter, a transformer, a feedback control unit and a voltage control circuit wherein the voltage control circuit is coupled to the DC voltage source, the bridge DC/AC converter and the feedback control unit. The voltage control circuit is used to convert DC voltage provided by the DC voltage source into a two-level DC square wave, which in turn converts the two-level DC square wave into an AC quasi-sine wave to drive the fluorescent lamp through the bridge DC/AC converter and the transformer. The feedback control unit generates signals to control the voltage control circuit and the bridge DC/AC converter.Type: ApplicationFiled: January 17, 2007Publication date: May 31, 2007Inventors: Shwang-Shi Bai, Yu-Pei Huang
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Publication number: 20070087481Abstract: A tape having a predetermined area is provided for a chip. A hole is drilled within the predetermined area. The chip is adhered to the predetermined area by underfilling an underfill material between the chip and the tape from one side of the chip. By the hole, the invention provides a short path for effectively dissipating gas to prevent voids from forming between the tape and the chip while the underfill material is applied.Type: ApplicationFiled: October 19, 2005Publication date: April 19, 2007Applicant: HIMAX TECHNOLOGIES, INC.Inventors: Shwang-Shi Bai, Hung-Yi Wang
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Publication number: 20060238142Abstract: A method for driving a fluorescent lamp and an inverter circuit for performing the same are used to reduce an amount of electromagnetic interference (EMI) generated by a transformer and an instantaneous loading of a DC voltage source. The inverter circuit comprises a DC square wave voltage source, a bridge DC/AC converter, a transformer, a feedback control unit and a voltage control circuit wherein the voltage control circuit is coupled to the DC voltage source, the bridge DC/AC converter and the feedback control unit. The voltage control circuit is used to convert DC voltage provided by the DC voltage source into a two-level DC square wave, which in turn converts the two-level DC square wave into an AC quasi-sine wave to drive the fluorescent lamp through the bridge DC/AC converter and the transformer. The feedback control unit generates signals to control the voltage control circuit and the bridge DC/AC converter.Type: ApplicationFiled: August 4, 2005Publication date: October 26, 2006Inventors: Shwang-Shi Bai, Yu-Pei Huang
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Publication number: 20060132405Abstract: A frame-varying addressing method of a color sequential liquid crystal display is disclosed for display of successive frames. Each of the frames is composed of three subframes, and each of the subframes is composed of a plurality of scan lines. According to the frame-varying addressing method of the invention, the addressing sequence of scan lines for display of any frame or subframe is arranged in the same direction as those for display of its adjacent frames or subframes, and is selected to be different from those for display of its adjacent frames or subframes. Further, the addressing sequence for the frame (subframe) and its adjacent frames (subframes) can be periodically or randomly selected, so as to effectively balance or greatly eliminate the spatial intensity variations due to inconsistent response times at different portions of the panel.Type: ApplicationFiled: December 22, 2004Publication date: June 22, 2006Inventors: Shwang-Shi Bai, Ming-Yeong Chen, Kuo-Tung Hsu
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Patent number: 6639366Abstract: A power supply circuit for a cold-cathode fluorescent lamp (CCFL). The power supply circuit converts a DC voltage to a high AC voltage for driving the CCFL. The power supply circuit includes: a switch; a switch control circuit for controlling the switch; a transformer for stepping up the voltage; an energy-preserving unit coupled to the transformer and the DC voltage output circuit; a first diode coupled to the transformer, the energy-preserving unit, and the switch; and a decoupling capacitor coupled to the transformer for outputting the high AC voltage.Type: GrantFiled: September 20, 2002Date of Patent: October 28, 2003Assignee: Chi Mei Optoelectronics Corp.Inventor: Shwang-Shi Bai
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Publication number: 20030076054Abstract: A power supply circuit for a cold-cathode fluorescent lamp (CCFL). The power supply circuit converts a DC voltage to a high AC voltage for driving the CCFL. The power supply circuit includes: a switch; a switch control circuit for controlling the switch; a transformer for stepping up the voltage; an energy-preserving unit coupled to the transformer and the DC voltage output circuit; a first diode coupled to the transformer, the energy-preserving unit, and the switch; and a decoupling capacitor coupled to the transformer for outputting the high AC voltage.Type: ApplicationFiled: September 20, 2002Publication date: April 24, 2003Inventor: Shwang-shi Bai