Patents by Inventor Hae-Seung Lee

Hae-Seung Lee 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: 7459667
    Abstract: A method and apparatus to operate a pixel circuit within an active pixel image sensor in a common gate amplifier mode. A bias voltage is applied to a row select transistor in a pixel circuit, and the row select transistor is operated in a common gate amplifier mode. Moreover, the row select transistor can be operated in the common gate amplifier mode for a reset period. An integrated photo current is transferred from a sense capacitor to a capacitor coupled between a drain of the row select transistor and a sense node. Also, a row select voltage is applied to the row select transistor, and the pixel circuit is operated in a common source amplifier mode for a readout period.
    Type: Grant
    Filed: September 7, 2005
    Date of Patent: December 2, 2008
    Assignee: Sensata Technologies, Inc.
    Inventors: Hae-Seung Lee, Keith G. Fife
  • Publication number: 20080278358
    Abstract: A switched capacitor circuit includes a first level-crossing detector to generate a level-crossing detection signal when an input signal crosses a first predetermined level. A first waveform generator generates a first predetermined waveform and a second waveform generator generates a second predetermined waveform. A second level-crossing detector generates a second level-crossing detection signal when said second predetermined waveform crosses a voltage reference level a second time. A second switch is coupled to the second level-crossing detector, and a third switch is coupled to the first level-crossing detector. The second switch turns OFF when the second level-crossing detection signal indicates the second predetermined waveform crossed the voltage reference level a second time. The third switch turns OFF when the first level-crossing detection signal indicates the input signal crossed the first predetermined level.
    Type: Application
    Filed: July 23, 2008
    Publication date: November 13, 2008
    Inventor: Hae Seung Lee
  • Patent number: 7446805
    Abstract: A circuit for a pixel site in an imaging array includes a light-detecting element to convert incident light to a photocurrent and a reset transistor, operatively connected to the light-detecting element, to reset a voltage associated with the light-detecting element. The reset transistor hard resets the voltage associated with the light-detecting element and soft resets the voltage associated with the light-detecting element after the generation of the hard reset of the voltage associated with the light-detecting element. A pixel voltage of a column or row line is also measured by hard resetting the column or row line voltage to a first predetermined voltage; soft resetting the column or row line voltage to a first pixel voltage; hard resetting the column or row line voltage to a second predetermined voltage; soft resetting the column or row line voltage to a second pixel voltage; and determining a difference between the first and second pixel voltages, the difference being the measured pixel voltage.
    Type: Grant
    Filed: January 6, 2004
    Date of Patent: November 4, 2008
    Assignee: Cypress Semiconductor Corporation
    Inventors: Hae-Seung Lee, Keith Glen Fife, Lane G. Brooks, Jungwook Yang
  • Patent number: 7436117
    Abstract: Provided are an organic electroluminescent device and a method of manufacturing the same. An organic electroluminescent device, comprising a rear substrate, an organic electroluminescent unit formed on one surface of the rear substrate and having a first electrode, an organic film, and a second electrode, and a front substrate joined to the rear substrate and having a porous oxide layer based on alumina on an inner surface of the front substrate. The alumina is hydrated amorphous alumina.
    Type: Grant
    Filed: August 25, 2004
    Date of Patent: October 14, 2008
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Jong-Hyuk Lee, Hae-Seung Lee, Yoon-Hyeung Cho, Won-Jong Kim, Jin-Woo Park
  • Patent number: 7417678
    Abstract: A sense node voltage relating to light intensity incident upon a light-detecting element is measured. To realize this measurement, a first integration reset pulse is generated to enable a resetting of the sense node voltage to a voltage value substantially equal to a reset voltage value associated with the first integration reset pulse, an edge of the first integration reset pulse triggering a beginning of a first integration period. Thereafter, a second integration reset pulse is generated to enable a resetting of the sense node voltage to a voltage value substantially equal to a reset voltage value associated with the second integration reset pulse, an edge of the second integration reset pulse triggering a beginning of a second integration period.
    Type: Grant
    Filed: January 5, 2004
    Date of Patent: August 26, 2008
    Assignee: Sensata Technologies, Inc.
    Inventors: Hae-Seung Lee, Keith Glen Fife, Lane G. Brooks
  • Publication number: 20080186077
    Abstract: Described is a switched-capacitor network and method for performing an analog circuit function. The circuit includes a switched-capacitor network, a comparator, and a voltage-offset network. The switched-capacitor network includes multiple switches, each having a respective threshold voltage and connected to one of a high-limit voltage, a low-limit voltage, and electrical ground. A first comparator input terminal in communication with the switched-capacitor network is configured to receive a node voltage therefrom during a first phase. The second input terminal is configured to receive one of the high-limit voltage and the low-limit voltage. The voltage-offset network provides a voltage shift at the first input terminal setting an input reference level at a mid-level voltage with respect to the high-limit voltage and the low-limit voltage.
    Type: Application
    Filed: February 6, 2007
    Publication date: August 7, 2008
    Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    Inventors: Matthew C. Guyton, Hae-Seung Lee
  • Publication number: 20080135895
    Abstract: A method and apparatus to operate a pixel circuit within an active pixel image sensor in a common gate amplifier mode.
    Type: Application
    Filed: January 31, 2008
    Publication date: June 12, 2008
    Inventors: Hae-Seung Lee, Keith G. Fife
  • Patent number: 7319425
    Abstract: Described is a switched capacitor circuit for performing an analog circuit function. Unlike conventional switched capacitor circuits employing operational amplifiers, the switched capacitor circuit uses a comparator and does not require direct feedback between the input and output of the comparator. The switched capacitor circuit includes a first and a second switched capacitance network, a comparator and a current source. The first switched capacitance network has an input terminal to receive a circuit input voltage during a first phase. The comparator has an input terminal in communication with the first switched capacitance network and an output terminal in communication with the second switched capacitance network through a switched terminal. The current source communicates with the switched capacitance networks and supplies a current to charge the networks during a second phase. The circuit can be used, for example, to provide high gain amplification in integrated circuits.
    Type: Grant
    Filed: January 30, 2006
    Date of Patent: January 15, 2008
    Assignee: Massachusetts Institute of Technology
    Inventors: John K. Fiorenza, Todd Sepke, Hae-Seung Lee, Charles G. Sodini
  • Patent number: 7289149
    Abstract: A low power imaging array has a plurality of pixels wherein each pixel converts an intensity of incident light into electrical energy. An operational transconductance amplifier is utilized in conjunction with the imaging array to process the image signals from the low power imaging array. The operational transconductance amplifier includes a current mirror stage with a current mirror gain factor. The current mirror gain factor is selected based on a pixel noise level introduced by the low power imaging array such that current mirror gain factor noise introduced by the current mirror gain factor results in an overall noise level that is less than or equal to a predetermined level.
    Type: Grant
    Filed: March 27, 2003
    Date of Patent: October 30, 2007
    Assignee: Sensata Technologies, Inc.
    Inventors: Hae-Seung Lee, Keith Glen Fife
  • Patent number: 7285340
    Abstract: An organic electroluminescent device which has a low moisture permeability and an oxygen permeability. The organic electroluminescent device includes a substrate, an organic light-emitting unit having a sequentially stacked structure of a first electrode, an organic film, and a second electrode formed on a surface of the substrate, and an organic-inorganic composite film made of a dehydrated polycondensate of a hydrolyzed product of trialkoxy metal formed on an upper surface of the second electrode of the organic light-emitting unit. The organic-inorganic composite film simplifies a manufacture process and has high visible light transmittance. Therefore, the organic-inorganic composite film can be used as an intermediate layer of a front emission type organic electroluminescent device. Also, the organic-inorganic composite film has excellent prevention function of the entry of moisture and/or oxygen.
    Type: Grant
    Filed: May 10, 2004
    Date of Patent: October 23, 2007
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Jong-Hyuk Lee, Yoon-Hyeung Cho, Hae-Seung Lee, Won-Jong Kim
  • Patent number: 7277129
    Abstract: An image sensor having a plurality of pixels, each including a sense node; an output node; a first device, connected to the sense node, producing a signal at the sense node that is proportional to incident light intensity at the pixel; at least one select node to receive a first select signal for selecting the pixel output node from the plurality of pixels; a reset device for resetting the pixel; and a sample and hold circuit including a sample node coupled to the sense node. At least one amplifier is provided, including a first input node to receive an output signal from the output node of a selected pixel and a second input node connected to a reference voltage source provided as a reference to reset a selected pixel. An amplifier output node is connected to couple an amplifier output signal to a selected pixel's sample and hold circuit.
    Type: Grant
    Filed: October 31, 2002
    Date of Patent: October 2, 2007
    Assignee: Sensata Technologies, Inc.
    Inventor: Hae-Seung Lee
  • Publication number: 20070222483
    Abstract: A comparator based circuit with effective offset cancellation includes first and second amplifiers and an offset capacitor operatively connected to the first and second amplifiers. An offset voltage source generates an offset voltage. A first switch connects the offset voltage source to ground during a first time period. The first amplifier generates an output voltage in response to the first switch connecting the offset voltage source to ground during the first time period. A second switch connects the offset capacitor to ground during a second time period. The first switch disconnects the offset voltage source from ground during a third time period, and the second switch disconnects the offset capacitor from ground during the third time period.
    Type: Application
    Filed: March 15, 2007
    Publication date: September 27, 2007
    Inventor: Hae-Seung Lee
  • Patent number: 7253600
    Abstract: A sample-data analog circuit includes a level-crossing detector. The level-crossing detector controls sampling switches to provide a precise sample of the output voltage when the level-crossing detector senses the predetermined level crossing of the input signal. A multiple segment ramp waveform generator is used in the sample-data analog circuits. The ramp waveform generator includes an amplifier, a variable current source, and a voltage detection circuit coupled to the current source to control the change in the amplitude of the current. The ramp generator produces constant slope within each segment regardless of the load condition. The sample-data analog circuit also utilizes variable bandwidths and thresholds.
    Type: Grant
    Filed: July 18, 2006
    Date of Patent: August 7, 2007
    Assignee: Cambridge Analog Technology, LLC
    Inventor: Hae-Seung Lee
  • Publication number: 20070164792
    Abstract: A sampled-data analog circuit uses zero-crossing detector. A waveform generator produces a plurality of segments of ramp at the output. An output of a zero crossing detector controls a sampling switch, thereby causing a precise sample of the output voltage to be taken at the instant the zero crossing detector senses the zero crossing of the input signal. The waveform generator further includes a output hold function to maintain the output voltage.
    Type: Application
    Filed: December 28, 2006
    Publication date: July 19, 2007
    Inventor: Hae-Seung Lee
  • Publication number: 20070164889
    Abstract: A switched capacitor circuit includes a first level-crossing detector to generate a level-crossing detection signal when an input signal crosses a first predetermined level. A first waveform generator generates a first predetermined waveform and a second waveform generator generates a second predetermined waveform. A second level-crossing detector generates a second level-crossing detection signal when said second predetermined waveform crosses a voltage reference level a second time. A second switch is coupled to the second level-crossing detector, and a third switch is coupled to the first level-crossing detector. The second switch turns OFF when the second level-crossing detection signal indicates the second predetermined waveform crossed the voltage reference level a second time. The third switch turns OFF when the first level-crossing detection signal indicates the input signal crossed the first predetermined level.
    Type: Application
    Filed: December 28, 2006
    Publication date: July 19, 2007
    Inventor: Hae-Seung Lee
  • Patent number: 7242429
    Abstract: A method for determining a pixel output value of an imager; the imager having a plurality of pixels, a reset switch associated with each pixel and a select switch associated with each pixel; due to incident illumination upon a pixel of the imager after a reset period. The method captures a first pixel output value when the reset switch is OFF during a reset period and the select switch is ON during a reset period and captures a second pixel output value when the select switch is ON near an end of an integration period. If the second pixel output value is captured when the select switch is ON near an end of a first integration period, the first pixel output value may be captured when the reset switch is OFF during a reset period preceding the first integration period and the select switch is ON during a reset period preceding the first integration period.
    Type: Grant
    Filed: January 2, 2003
    Date of Patent: July 10, 2007
    Assignee: SMAL Camera Technologies
    Inventors: Hae-Seung Lee, Keith Glen Fife
  • Publication number: 20070146018
    Abstract: A sampling circuit includes an input voltage source; a first switch having an input operatively connected to the input voltage source; a sampling capacitor operatively connected to an output of the first switch; an operational amplifier having an inverting input operatively connected to the sampling capacitor; a second switch operatively connected across the inverting input of the operational amplifier and an output of the operational amplifier; and a second capacitor operatively connected to the output of the first switch. The first switch has a variable parasitic capacitance, and the second capacitor has a substantially more linear capacitance than the variable parasitic capacitance and is in parallel with the variable parasitic capacitance. A combined variable parasitic capacitance and capacitance of said switch capacitor is more linear than the variable parasitic capacitance of the first switch.
    Type: Application
    Filed: January 10, 2007
    Publication date: June 28, 2007
    Inventor: Hae-Seung Lee
  • Publication number: 20070035335
    Abstract: A sample-data analog circuit includes a level-crossing detector. The level-crossing detector controls sampling switches to provide a precise sample of the output voltage when the level-crossing detector senses the predetermined level crossing of the input signal. A multiple segment ramp waveform generator is used in the sample-data analog circuits. The ramp waveform generator includes an amplifier, a variable current source, and a voltage detection circuit coupled to the current source to control the change in the amplitude of the current. The ramp generator produces constant slope within each segment regardless of the load condition. The sample-data analog circuit also utilizes variable bandwidths and thresholds.
    Type: Application
    Filed: July 18, 2006
    Publication date: February 15, 2007
    Inventor: Hae-Seung Lee
  • Publication number: 20070024267
    Abstract: A sample-data analog circuit includes a level-crossing detector. The level-crossing detector controls sampling switches to provide a precise sample of the output voltage when the level-crossing detector senses the predetermined level crossing of the input signal. A multiple segment ramp waveform generator is used in the sample-data analog circuits. The ramp waveform generator includes an amplifier, a variable current source, and a voltage detection circuit coupled to the current source to control the change in the amplitude of the current. The ramp generator produces constant slope within each segment regardless of the load condition. The sample-data analog circuit also utilizes variable bandwidths and thresholds.
    Type: Application
    Filed: July 18, 2006
    Publication date: February 1, 2007
    Inventor: Hae-Seung Lee
  • Publication number: 20070001518
    Abstract: A sampled-data analog circuit includes a level-crossing detector. The level-crossing detector controls sampling switches to provide a precise sample of the output voltage when the level-crossing detector senses the predetermined level crossing of the input signal. The level-crossing detection may be a zero-crossing detection. An optional common-mode feedback circuit can keep the output common-mode voltage substantially constant.
    Type: Application
    Filed: June 16, 2006
    Publication date: January 4, 2007
    Inventor: Hae-Seung Lee