Binary Weighted Patents (Class 345/692)
  • Patent number: 8284090
    Abstract: Embodiments of the present invention provide a hybrid analog to digital converter that may include a DAC coupled to a hybrid analog to digital converter input; an integrator having an input coupled to the hybrid analog to digital converter input and the DAC, and generating an integrator output; a comparator coupled to the integrator output and having a comparator output; a successive approximation register coupled to the comparator output; and a counter coupled to the comparator output to generate an hybrid analog to digital converter output. The hybrid analog to digital converter may be operable as a successive approximation register converter and a continuous time sigma delta converter.
    Type: Grant
    Filed: March 22, 2010
    Date of Patent: October 9, 2012
    Assignee: Analog Devices, Inc.
    Inventor: Roberto Maurino
  • Publication number: 20120218323
    Abstract: A system and method for reducing pulse width modulation contouring artifacts. Each input intensity value is translated to at least one non-binary bit pattern for display. Many of the input intensity values are translated to at least two alternate non-binary bit patterns. The alternate codes are used to smooth the transition between intensity codes as major bits are turned on. The smoothing occurs by the gradual transition from codes that do not use the major bit to codes that do use the major bit. Typically the alternate codes are selected based on the location of the pixel in a spatial pattern (100) and the alternate codes are spatially alternated from one pixel (102) to the next (104). Other embodiments temporally alternate the codes from one period—typically a frame period—to the next. Still other embodiments alternate the codes both spatially and temporally.
    Type: Application
    Filed: May 8, 2012
    Publication date: August 30, 2012
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Daniel J. Morgan
  • Patent number: 8228350
    Abstract: A method for writing data to a display includes the steps of receiving a plurality of data bits, where each bit is associated with a different pixel of the display, reading the value of each data bit, determining whether each data bits has an off-state value, and generating a disable signal if each data bit has an off-state value. Responsive to a disable signal, the method further includes suspending the transfer of data to the pixels of the display, turning off a light source (e.g., an LED, laser, etc.) for a time period dependent on the significance of at least one of the data bits, and/or forcing each pixel of the display into an off state for a time period dependent on the significance of at least one of the data bits. A display driver circuit for performing the methods of the present invention is also disclosed.
    Type: Grant
    Filed: June 6, 2008
    Date of Patent: July 24, 2012
    Assignee: OmniVision Technologies, Inc.
    Inventor: Sunny Yat-san Ng
  • Patent number: 8228348
    Abstract: The invention describes a method for improving the spatial and off-axis conformance of display systems with respect to an enforced greyscale or color display standard. In the display systems, the native transfer curve is obtained for each pixel or zone of pixels, i.e. as a function of position on the display and as a function of viewing-angle. Once that information is available, an optimal conversion scheme from P-value to DDL can be created for each position on the display and this for all possible viewing-angles. In use, the conversion scheme is used to obtain an improved DICOM behavior. This optimization is also done with respect to the viewing-angle, based on a pre-set, selectable or measured viewing angle.
    Type: Grant
    Filed: April 15, 2005
    Date of Patent: July 24, 2012
    Assignee: Barco N.V.
    Inventor: Tom Kimpe
  • Patent number: 8229251
    Abstract: The present approach increases bandwidth by performing at least two functions at the pre-processing level. Specifically, under the present approach, program code is structured so that the segmentation and binarization functions/modules (and optionally a blob analysis function/module) are merged into a single module to reduce memory bandwidth. In addition, each image frame is segmented into a plurality of partitions (e.g., vertical strips) to enhance the reusability of the image data in LS already fetched from main memory. Each partition is then processed by a separate one of a plurality of processing engines, thereby increasing the utilization of all processing engines and allowing the processing engines to maintain good bandwidth.
    Type: Grant
    Filed: February 8, 2008
    Date of Patent: July 24, 2012
    Assignee: International Business Machines Corporation
    Inventors: Munehiro Doi, Moon J. Kim, Yumi Mori, Hangu Yeo
  • Patent number: 8228349
    Abstract: A method for writing data to a display includes the steps of receiving a plurality of data bits, where each bit is associated with a different pixel of the display, reading the value of each data bit, determining whether each data bits has an off-state value, and generating a disable signal if each data bit has an off-state value. Responsive to a disable signal, the method further includes suspending the transfer of data to the pixels of the display, turning off a light source (e.g., an LED, laser, etc.) for a time period dependent on the significance of at least one of the data bits, and/or forcing each pixel of the display into an off state for a time period dependent on the significance of at least one of the data bits. A display driver circuit for performing the methods of the present invention is also disclosed.
    Type: Grant
    Filed: June 6, 2008
    Date of Patent: July 24, 2012
    Assignee: OmniVision Technologies, Inc.
    Inventor: Sunny Yat-san Ng
  • Patent number: 8212844
    Abstract: A method and a device for encoding the video level of a pixel of a picture into a subfield code word in a display device using a PWM (Pulse Width Modulation) technology and subfields for displaying video picture. The bits of the subfield code word are computed recursively one after the other from the bit having the most significant weight to the bit having the least significant weight. In determining the state of a bit of the subfield code word, a first threshold and a second threshold is associated with the bit, the second threshold being greater than the first threshold, and the video level to be encoded by this bit and its following bits in the subfield code word are compared to the first and second thresholds. A state is allocated to the bit based on the comparison.
    Type: Grant
    Filed: June 2, 2008
    Date of Patent: July 3, 2012
    Assignee: Thomson Licensing
    Inventors: Cedric Thebault, Carlos Correa, Sebastien Weitbruch
  • Patent number: 8184077
    Abstract: A liquid crystal display device and a method for improving a color reproducibility thereof, detects a gray scale value in applied image information that reduces a color reproducibility of a liquid crystal display device by measuring a gray scale level of a color displayed on a liquid crystal display panel while increasing the gray scale value of the color, and storing a maximum value of the gray scale level is displayable prior to reducing the color reproducibility. The applied image information is compensated to prevent reduction in the color reproducibility.
    Type: Grant
    Filed: October 23, 2003
    Date of Patent: May 22, 2012
    Assignee: LG Display Co., Ltd
    Inventors: Don-Gyou Lee, Ki-Yon Song, Jung-Ho Kil
  • Patent number: 8174545
    Abstract: A system and method for reducing pulse width modulation contouring artifacts. Each input intensity value is translated to at least one non-binary bit pattern for display. Many of the input intensity values are translated to at least two alternate non-binary bit patterns. The alternate codes are used to smooth the transition between intensity codes as major bits are turned on. The smoothing occurs by the gradual transition from codes that do not use the major bit to codes that do use the major bit. Typically the alternate codes are selected based on the location of the pixel in a spatial pattern (100) and the alternate codes are spatially alternated from one pixel (102) to the next (104). Other embodiments temporally alternate the codes from one period—typically a frame period—to the next. Still other embodiments alternate the codes both spatially and temporally.
    Type: Grant
    Filed: April 6, 2009
    Date of Patent: May 8, 2012
    Assignee: Texas Instruments Incorporated
    Inventor: Daniel J. Morgan
  • Patent number: 8149252
    Abstract: A display uses x illuminator systems to produce x primary colors and y overlap colors, which are combinations of primary colors, to illuminate a spatial light modulator in a display system. A first set of n duty cycles for the x primary colors over a frame is provided, wherein the display system can select any one of the duty cycles to produce a desired white point. A second set of n duty cycles of x+y colors over a frame corresponding to the first set of duty cycles is determined, where the second set of duty cycles are generated responsive to a specified desired allocation of the frame to the y overlap colors, such that each of the overlap colors can be displayed from a dark shade to a bright shade while maintaining a constant color point.
    Type: Grant
    Filed: May 22, 2008
    Date of Patent: April 3, 2012
    Assignee: Texas Instruments Incorporated
    Inventor: Todd Alan Clatanoff
  • Patent number: 8134532
    Abstract: An image display apparatus includes an image displaying unit that includes a light source unit and a light modulation device, a histogram generating unit, a light source luminance calculator, a function storing unit, a first evaluation value calculator, a second evaluation value calculator, a third evaluation value calculator, a function acquiring unit and a control unit. The function acquiring unit acquires a plurality of the third evaluation values by repeating processing by the first to third evaluation value calculators with modification to a level conversion function and acquires a level conversion function that has a smallest third evaluation. The control unit supplies a signal of a converted video resulting from conversion of the image with the acquired level conversion function to the light modulation device.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: March 13, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masahiro Baba, Goh Itoh
  • Patent number: 8130172
    Abstract: A display method of a plasma display device and plasma display device are provided. The display method includes nonlinearly converting first image data corresponding to an input image signal to second image data having a gradation value smaller than a gradation value of first image data and expressing the second image data by a real part and an error part. The display method includes error diffusing of, when the error part of the second image data is not zero, spatially or temporally diffusing the error part. The display method includes subfield pattern converting of selecting a lighting pattern of the subfields based on the error-diffused second image data.
    Type: Grant
    Filed: March 15, 2010
    Date of Patent: March 6, 2012
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Masanori Takeuchi, Akira Yamamoto
  • Patent number: 8115787
    Abstract: A method and system for converting color image data (data outputting from element 202) from a, for example, three-dimensional color space format to a format usable by an n-primary display (206), wherein n is greater than or equal to 3. The system (converter 204) may define a two-dimensional sub-space having a plurality of two-dimensional positions, each position representing a set of n primary color values and a third, scaleable coordinate value for generating an n-primary display input signal (signal inputting toi display 206). Furthermore, the system may receive a three-dimensional color space input signal including out-of range pixel data not reproducible by a three-primary additive display, and may convert the data to side gamut color image pixel data suitable for driving the wide gamut color display.
    Type: Grant
    Filed: October 2, 2008
    Date of Patent: February 14, 2012
    Assignee: Genoa Color Technologies Ltd.
    Inventors: Moshe Ben-Chorin, Oded Ben-David
  • Patent number: 8111184
    Abstract: A m-bit DAC outputs a voltage that is the result of interpolation from two reference voltages. The two reference voltages are selected, inclusive of redundant selection of the same reference voltage (inclusive also of reference voltages other than adjacent voltages) out of a plurality of reference voltages. The plurality of reference voltages are grouped into first to (3S+1)th groups (where S is a power of 2). An ith group includes [3S(j?1)+i]th reference voltages (where j=1, 2, . . . h, and h is a prescribed integer). The decoder includes (3S+1)th subdecoders, each selecting one voltage responsive to a first MSB group; and a (3S+1)-input and 2-output subdecoder for selecting two voltages, inclusive of redundant selection of the same reference voltage, out of (3S+1) voltages selected by the respective first to (3S+1)th subdecoders, responsive to a LSB group and outputs them to an interpolation amplifier (ratio 1:1).
    Type: Grant
    Filed: February 5, 2009
    Date of Patent: February 7, 2012
    Assignee: Renesas Electronics Corporation
    Inventor: Hiroshi Tsuchi
  • Patent number: 8072473
    Abstract: A gray scale voltage generator and a method of generating a gray scale voltage in a transmissive and reflective type liquid crystal display device are disclosed. A transmissive mode gray scale data are transformed into real reflective mode gray scale data. An integer part is extracted from the real reflective mode gray scale data as a first reflective mode gray scale data. The first reflective mode gray scale data and temporary reflective mode gray scale data are mixed in a predetermined ratio by N-frame period. The temporary reflective mode gray scale data has a sum of one and the first reflective mode gray scale data. Pseudo gray scale data are inserted into the second reflective mode gray scale data. Therefore, superior display quality is provided in both transmissive and reflective mode.
    Type: Grant
    Filed: September 19, 2006
    Date of Patent: December 6, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sang-Il Kim, Cheol-Woo Park, Tae-Hwan Kim, Dong-Sik Sakong, Young-Chol Yang, Won-Sang Park, Jae-Chang Kim
  • Patent number: 8072410
    Abstract: Disclosed is an impulsive type liquid crystal driving device which inserts black data during a vertical blanking interval and then realizes motion picture, comprising: a liquid crystal panel for including a plurality of gate bus lines, which are arranged in one-direction, and a plurality of data bus lines which are arranged in a direction perpendicular to the plurality of gate bus lines; a gate driver section for sequentially scanning the plurality of gate bus lines during an active address interval in response to a second vertical starting signal, a vertical clock signal and an output enable signal, and scanning the plurality of gate bus lines during a vertical blanking interval in a unit of a predetermined number of lines; and a current boosting section for increasing current amount supplied to the gate bus lines during the vertical blanking interval in response to a pulse width modulation signal.
    Type: Grant
    Filed: July 23, 2003
    Date of Patent: December 6, 2011
    Assignee: Hydis Technologies Co., Ltd.
    Inventors: Jung Kook Park, Seo Yoon Kim, Dae Yong Jang
  • Patent number: 8059140
    Abstract: A flat panel display device including: a display region including pixels connected to scan lines and data lines; a dummy display region including dummy pixels connected to at least two dummy scan lines and the data lines; a scan driver for providing scan signals and dummy scan signals to the scan lines and the dummy scan lines; a data driver for generating gray scale voltages corresponding to input digital data and providing them to corresponding pixels through the data lines; and a timing controller for controlling the scan driver and the data driver, wherein the data driver uses parasitic capacitance components existing in at least two data lines and capacitance components in the pixels and the dummy pixels connected to the at least two data lines, as a sampling capacitor and a holding capacitor to generate the gray scale voltages through charge sharing between the at least two data lines.
    Type: Grant
    Filed: January 30, 2007
    Date of Patent: November 15, 2011
    Assignee: Samsung Mobile DIsplay Co., Inc.
    Inventors: Oh Kyong Kwon, Byong Deok Choi
  • Patent number: 8049708
    Abstract: The present invention provides a controller for controlling strings of LEDs in a liquid crystal display. The hybrid controller uses both analog and digital circuit components. Error amplifiers are used to compare analog feedback signals received from the LED strings with reference signals. The results of those comparisons are converted to digital data and processed by a digital signal processor (DSP). The DSP calculates the drive voltages for the LED strings based on the deviation between the actual current flows (represented by feedback signals) and the desired current flows (represented by reference signals) through the LED strings. Analog drivers provide the drive voltages to the LED strings.
    Type: Grant
    Filed: January 12, 2007
    Date of Patent: November 1, 2011
    Assignee: Atmel Corporation
    Inventors: Hendrik Santo, Dilip Sangam, Gurjit Thandi, Kien Vi
  • Patent number: 8009181
    Abstract: An object of the present invention is to provide a display method capable of displaying all gray levels of an input image signal with reduced flicker, and a display apparatus using this method. The present invention provides a display method that allows a display apparatus to display gray levels represented by a first number of bits of an image signal inputted to a driver circuit that drives the display apparatus, when the first number of bits is larger than a second number of bits of gray-level data outputted from the driver circuit.
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: August 30, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventor: Kunifumi Nakanishi
  • Publication number: 20110199405
    Abstract: Methods and devices for generating grayscale using digital pulse width modulation between optical states. Grayscale may be generated for each component color using multiple algorithm cycles per display field. Subsets of binary weighted bit values for data values of each component color may be split across algorithm cycles to reduce the number of data comparisons per color per display field. The total number of data comparisons per color per display field may be reduced by half or more.
    Type: Application
    Filed: April 28, 2011
    Publication date: August 18, 2011
    Applicant: MICRON TECHNOLOGY, INC.
    Inventors: JAMES M. DALLAS, DAVID B. HOLLENBECK, PER HAROLD LARSEN, RAINER M. MALZBENDER, EARLE R. VICKERY, III, MICHAEL WAYNE YEE
  • Patent number: 7973809
    Abstract: A driving circuit of an electro-optical device wherein one field is divided into p (p is an integer that is equal to or more than two) groups and each group is divided into two sub-fields. The p groups each are set to have the length of a time period that is equal to one another. The 2p sub-fields that constitute the one field are set to different lengths of time periods in such a manner that a boundary between two sub-fields of each group is shifted by a predetermined interval compared to the boundary between the two sub-fields of the preceding group. The different gray scale values are expressed by turning on a single sub-field or n (n is an integral number that is equal to two or more and that is equal to or less than 2p) sub-fields that are adjacent to each other.
    Type: Grant
    Filed: April 22, 2008
    Date of Patent: July 5, 2011
    Assignee: Seiko Epson Corporation
    Inventors: Hiroyuki Hosaka, Hidehito Iisaka
  • Patent number: 7961204
    Abstract: A gray-scale representation method for a plasma display panel, which method includes arranging, in time sequence, a plurality of subfields each having a brightness weight and achieving gray-scale representation by a combination of the subfields, each subfield including an address period and a sustain period. In the gray-scale representation method, the number of sustain pulses for each subfield is determined so that a light generated from the difference of the number of sustain pulses between two adjacent gray scales can be greater than a light discharged in the address period, when the number of subfields for the higher one of the two adjacent gray scales is less than that for the lower one. The reversion of gray scales that occurs when the address light is increased as high as the sustain light can be eliminated to achieve correct gray-scale representation.
    Type: Grant
    Filed: September 11, 2007
    Date of Patent: June 14, 2011
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Yong-Jin Kim
  • Patent number: 7948505
    Abstract: The present invention provides an image signal processor, comprising: (a) an input circuit for receiving and/or holding an image signal of N-bit binary data word, where N is a positive integer; (b) a data converter converting at least M-bit data of binary data into non-binary data having multiple bits, where M is a positive integer and N?M?2, wherein (c) all bits of the non-binary data have a weight which is equal to, or less than, that of the least significant bit of the M-bit data of binary data; and (d) the data converter outputting the each bit of the non-binary data in sequence starting from an equal data value.
    Type: Grant
    Filed: August 16, 2007
    Date of Patent: May 24, 2011
    Assignees: Silicon Quest Kabushiki-Kaisha, Olympus Corporation
    Inventors: Kazuma Arai, Fusao Ishii, Yoshihiro Maeda, Hirotoshi Ichikawa
  • Patent number: 7944458
    Abstract: A digital-analog converter (DAC) including: a gray scale generator for generating gray scale voltages corresponding to digital data input through charge sharing between a plurality of data lines and a plurality of dummy data lines; a switching signal generator for providing operation control signals for a plurality of switches of the gray scale generator; and a reference voltage generator for generating reference voltages and for providing the reference voltages to the gray scale generator. According to the present invention, the digital-analog converter uses capacitance components existing in the respective data lines and the dummy data lines as a sampling capacitor and a holding capacitor to generate desired gray scale voltages through charge sharing between the data lines and the dummy data lines, thereby reducing area and power consumption over an existing R-string type of DAC.
    Type: Grant
    Filed: January 22, 2007
    Date of Patent: May 17, 2011
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventors: Oh Kyong Kwon, Byong Deok Choi
  • Publication number: 20110109670
    Abstract: An active matrix display panel comprises a substrate, an array of pixel circuits being arranged in a matrix of at least one column and a plurality of rows on the substrate, each pixel circuit comprising a light-emitting element, capable of emitting light of an intensity determined by the value of a current passed through it, and at least one column line, each column line arranged to conduct a reference current, provided by a current driving circuit, when connected to the panel. The pixel circuits in a column are divided into a plurality of groups of at least one pixel circuit. The active matrix display panel comprises at least one current mirror circuit associated with a first group, comprising a first current mirror, arranged to mirror a reference current flowing through a column line to a first current mirror output.
    Type: Application
    Filed: November 16, 2010
    Publication date: May 12, 2011
    Applicant: TPO Displays Corp.
    Inventors: Adrianus Sempel, Gerben J. Hekstra, David A. Fish, Alan G. Knapp, Andrea Giraldo, Mark T. Johnson
  • Patent number: 7929001
    Abstract: A display device, includes: a display panel comprising a plurality of pixels; a signal controller which receives an n+k bit first image signal to divide one frame into 2k number of sub frames and generates a non-image signal according to an upper k most significant bits of the binary code and a second image signal with a lower n bit, of the first image signal in one frame with a predetermined rate; and a data driver which supplies a data voltage selected on the basis of the non-image signal and the second image signal, to the pixels.
    Type: Grant
    Filed: October 15, 2007
    Date of Patent: April 19, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jae-sung Bae, Jun-pyo Lee, Jin-ho Park
  • Patent number: 7911545
    Abstract: The invention relates to a method for processing video pictures, the video pictures consisting of pixels digitally coded, the digital code word determining the length of the time period during which the corresponding pixel of a display is activated, wherein to each bit of a digital code word a certain activation duration called sub-field is assigned, the sum of the duration of the sub-fields according to a given code word determining the length of the time period during which the corresponding pixel is activated, said method comprising the following steps: detecting the video pictures source mode and the parity between pictures, if the source is in film mode, distributing the total number of sub-fields used for two frame raster in three groups of sub-fields and assigning to a value of a pixel a code word that corresponds to the distribution of the active sub-fields period over the three sub-fields groups, and if the source is in camera mode, distributing the total number of sub-fields used for each frame r
    Type: Grant
    Filed: December 14, 2004
    Date of Patent: March 22, 2011
    Assignee: Thomson Licensing
    Inventors: Sébastien Weitbruch, Cédric Thebault, Ingo Doser
  • Patent number: 7884839
    Abstract: A method of enhancing the gray scale resolution of a PWM system. The method includes defining an N-bit PWM sequence with a length of 2N?1 units. The N-bit PWM sequence includes a least significant bit (LSB) segment characterized by a temporal length of one unit. In some embodiments, the temporal length of one unit is referred to as a time t0. The method also includes defining a fractional PWM sequence. The fractional PWM sequence includes the N-bit PWM sequence and a fractional bit segment of temporal length F. The temporal length of the fractional PWM sequence is 2N?1+F units. In a particular embodiment, F=1 and the temporal length of the fractional PWM sequence is 2N.
    Type: Grant
    Filed: December 5, 2005
    Date of Patent: February 8, 2011
    Assignee: Miradia Inc.
    Inventor: Michael Y. T. Hwang
  • Patent number: 7812790
    Abstract: A method of driving a plasma display panel that is adaptive for improving a picture quality. In the method, first and second sustain pulses having a different width during the sustain period are alternately applied to the first and second row electrodes.
    Type: Grant
    Filed: December 14, 2006
    Date of Patent: October 12, 2010
    Assignee: LG Electronics Inc.
    Inventors: Seong Ho Kang, Sang Jin Yun
  • Patent number: 7804509
    Abstract: The invention relates to a method and a device for encoding the luminance value of a pixel of a picture into a subfield code word in a display device. It can be applied to every display device using a PWM (Pulse Width Modulation) technology and subfields for displaying video picture. It can be used to compensate for any luminance problem that can be estimated. The general idea of the recursive coding is to encode one sub-field after the other in order to be able to compensate for problems occurring on one sub-field with the other sub-fields. More particularly, the bits of a subfield code word are computed recursively one after the other such that the defects (e.g. line load and/or linearity) in the light emission or luminance generated by a bit of the subfield code word can be compensated by the following bits of the subfield code word.
    Type: Grant
    Filed: September 18, 2006
    Date of Patent: September 28, 2010
    Assignee: Thomson Licensing
    Inventors: Cédric Thebault, Carlos Correa, Sébastien Weitbruch
  • Patent number: 7773103
    Abstract: Aspects of the invention can provide a light source control device that controls driving for a light source unit in order to supply light that is modulated in response to an image signal. The light source control device can include an amplitude converting unit that allocates at least one bit of the image signal to conversion of an amplitude of a pulse signal and converts the amplitude of the pulse signal according to an allocated number of bits, and a pulse signal generating unit that generates a pulse signal at the amplitude converted in the amplitude converting unit.
    Type: Grant
    Filed: July 26, 2005
    Date of Patent: August 10, 2010
    Assignee: Seiko Epson Corporation
    Inventor: Takashi Takeda
  • Patent number: 7768538
    Abstract: One embodiment provides a method that includes displaying Boolean combinations of two or more bit planes.
    Type: Grant
    Filed: May 9, 2005
    Date of Patent: August 3, 2010
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Wiatt E. Kettle, Brett E. Dahlgren, Matthew J. Gelhaus
  • Publication number: 20100165013
    Abstract: Disclosed is a liquid crystal display device, which is capable of reducing a required response speed and increasing a pixel aperture ratio, as compared with a field sequential driving scheme. A unit pixel of a liquid crystal display panel is made up of a first sub-pixel adapted to allow only any two of red, green and blue lights to pass therethrough, and a second sub-pixel adapted to allow only a remaining one of the red, green and blue lights to pass therethrough, wherein one frame of image is time-divided into n pieces (wherein n is an integer of two or more), and respective image information about the two lights are applied to the first sub-pixel during every duration of the 1/n frame, while applying image information about the remaining one light to the second sub-pixel during a duration of the one frame of image.
    Type: Application
    Filed: February 7, 2007
    Publication date: July 1, 2010
    Inventors: Kazuhisa Yamamoto, Tetsuro Mizushima, Tatsuo Itoh, Kenichi Kasazumi, Shinichi Kadowaki
  • Patent number: 7710440
    Abstract: A video signal is processed using dither coefficients. Dither coefficients pattern signals are generated. Each pattern signal carries positive and negative dither coefficients arranged in an (n×m) matrix where “n” and “m” being positive integers larger than zero, the sum total of the coefficients being zero. One of the pattern signal is selected for each predetermined unit of picture carried by the video signal. Or, it is selected according to locations of dither coefficients on pixels arranged on a display panel. Dither coefficients of the selected pattern signal are added to an input video signal, thus outputting a video signal to be supplied to the display panel. Instead of the dither coefficients pattern signals, dither pattern signals can be generated, each carrying positional data indicating locations of dither coefficients on the pixels on the display panel.
    Type: Grant
    Filed: July 19, 2006
    Date of Patent: May 4, 2010
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Shigehiro Masuji, Hideki Aiba
  • Patent number: 7710360
    Abstract: There is provided a plasma display device including: a nonlinear conversion circuit which nonlinearly converts a first image signal to a second image signal and expresses the second image signal by a real part and an error part to avoid use of a specific subfield lighting pattern; an error diffusion circuit which, when the error part of the second image signal is not zero, spatially or temporally diffuses the error part; and a subfield pattern conversion circuit which, when a lighting pattern of subfields is selected based on the error-diffused second image signal, selects another subfield lighting pattern without using the specific subfield lighting pattern.
    Type: Grant
    Filed: March 23, 2006
    Date of Patent: May 4, 2010
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Masanori Takeuchi, Akira Yamamoto
  • Patent number: 7705816
    Abstract: A method of displaying image data, which can mitigate a double-boundary problem and improve MPRT, includes the steps of: receiving a plurality of frame data of a pixel; correcting subframe data of two of the plurality frame data; and sequentially displaying each of the subframe data of the plurality frame data.
    Type: Grant
    Filed: April 10, 2007
    Date of Patent: April 27, 2010
    Assignee: Chi Mei Optoelectronics Corp.
    Inventors: Yu-Yeh Chen, Hung-Yu Lin, Chia-Hang Lee
  • Patent number: 7643040
    Abstract: There is disclosed a system and method for enhancing gray scale output on a color display. Various gray intensities are mapped based on an image made of various shades of gray so that a viewer perceives a depth of gray levels beyond those available in gray scale from the color display. Pseudo shades of gray are displayed between the levels of true gray that typically are displayed in order to provide a smoother transition between the levels of true gray that are displayed.
    Type: Grant
    Filed: April 8, 2004
    Date of Patent: January 5, 2010
    Assignee: SonoSite, Inc.
    Inventors: Donn E. Gabrielson, Richard L. Fix
  • Patent number: 7636099
    Abstract: A driving device for quickly changing the gray level of the liquid crystal display (LCD and its driving method are disclosed. The driving device includes a group of thin film transistors with matrix array, a plurality of gate lines and a plurality of data lines. The object of quickly changing the gray level of the LCD can be accomplished by the different arrangement of the gate lines and the data lines and the different connection of the thin film transistors with the gate lines and the data lines. The driving method includes: two gate lines in the LCD are simultaneously or synchronously turned on according to in the bright, period or in the black, period, the voltage for displaying the present frame interval data or the voltage for displaying black image is given to the thin film transistors connected with the gate lines, and scanning continues in turn.
    Type: Grant
    Filed: May 16, 2008
    Date of Patent: December 22, 2009
    Assignee: VastView Technology Inc.
    Inventors: Yuh-Ren Shen, Chun-Chi Chen, Cheng-Jung Chen
  • Patent number: 7619601
    Abstract: A display device and display method are provided. The display device and the display method can prevent generation of noise in delta array pixels of an FRC method, and able to prevent a lowering of an image quality, that is, a display device of predetermined array pixels displaying a (2n+1) gradation by alternately displaying a 2n gradation and a (2n+2) gradation, comprising a modulation pattern generation circuit for generating a spatial/temporal modulation pattern switching a temporal modulation pattern every frame (F) and changing an order of application of a spatial modulation pattern every NF (N is an even number); a data processing circuit for modulating image data in accordance with the modulation pattern generated by the modulation pattern generation circuit; and a drive circuit for driving the display in accordance with the modulated data of the data processing circuit.
    Type: Grant
    Filed: December 6, 2005
    Date of Patent: November 17, 2009
    Assignee: Sony Corporation
    Inventors: Mizuki Yamada, Yoshiharu Nakajima, Yoshitoshi Kida
  • Patent number: 7612741
    Abstract: When driving a plasma display panel, in a first subfield of a first frame, turn-on cells are selected among cells of a first group of electrodes by performing an address operation for the first group, and a sustain discharge is performed for selected cells, and turn-on cells are selected among cells of a second group of electrodes by performing an address operation for the second group, and a sustain discharge is performed for selected cells. In a first subfield of a second frame, turn-on cells are selected among cells of the second group by performing an address operation for the second group, and a sustain discharge is performed for selected cells, and turn-on cells are selected among cells of the first group by performing an address operation for the first group, and a sustain discharge is performed for selected cells.
    Type: Grant
    Filed: November 14, 2005
    Date of Patent: November 3, 2009
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Dae-Hwan Kim
  • Patent number: 7605806
    Abstract: The present invention relates to a data driving system and method for driving a panel. The data driving system comprises: a gamma voltage supply and a D/A converter. The gamma voltage supply produces a plurality of gamma voltages. The D/A converter receives the gamma voltages, a first pixel value and a second pixel value, and converts the first pixel value and the second pixel value to a corresponding gamma voltage in the gamma voltages. When the D/A converter converts the first pixel value, the gamma voltages have a first polarity offset. When the D/A converter converts the second pixel value, the gamma voltages have a second polarity offset. Because the data driving system of the invention periodically switches the first polarity offset and the second polarity offset of the gamma voltage supply, an offset in the driving voltage is eliminated by the first polarity (positive) offset and the second polarity (negative) offset in space and time. Therefore, there is no band mura in the panel.
    Type: Grant
    Filed: July 20, 2005
    Date of Patent: October 20, 2009
    Assignee: Himax Technologies, Inc.
    Inventors: Ying-Lieh Chen, Lin Kai Bu
  • Patent number: 7589700
    Abstract: It is an object to provide a driving method of a semiconductor display device by which generation of pseudo contour can be suppressed while suppressing the operating frequency of a driver circuit. It is also an object to provide a driving method of a semiconductor display device by which generation of pseudo contour can be suppressed while suppressing decrease in image quality. One mode of the invention is a driving method of a semiconductor display device, wherein a set of a plurality of subframe periods is provided in one frame period and the set of the plurality of subframe periods is inverted at some point to be provided.
    Type: Grant
    Filed: July 22, 2005
    Date of Patent: September 15, 2009
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Keisuke Miyagawa
  • Patent number: 7576759
    Abstract: A method of producing an image. Image data word comprising image data bits for a portion of the image is received at a first frame rate. At least two threshold data values are selected. A first portion of the image data word is compared with the threshold data values. A second portion of said image data word is displayed at a frame rate at least two times said first frame rate. Image data based on the comparison between the first portion of the image data word and the threshold data values is displayed at a frame rate at least two times the first frame rate.
    Type: Grant
    Filed: August 10, 2004
    Date of Patent: August 18, 2009
    Assignee: Texas Instruments Incorporated
    Inventors: Gregory S. Pettitt, Bradley W. Walker, Matthew John Fritz
  • Patent number: 7573411
    Abstract: A digital-to-analog converter outputting an analog data voltage corresponding to n-bit data, includes a chopping amplification unit adapted to receive an upper bit voltage corresponding to upper x bits of the n-bit data and a lower bit voltage corresponding to lower y bits of the n-bit data and to output the analog data voltage. The chopping amplification unit may include a sample and hold capacitor adapted to be charged with the upper bit voltage in a non-inverting mode, and a chopping amplifier adapted to supply the upper bit voltage to the sample and hold capacitor in the non-inverting mode and adapted to output a voltage corresponding to the sum of the upper bit voltage and the lower bit voltage as the analog data voltage in an inverting mode.
    Type: Grant
    Filed: January 9, 2008
    Date of Patent: August 11, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yun-seung Shin, Ju-hyun Ko
  • Patent number: 7545397
    Abstract: Video processing for enhancing contrast includes detecting the ambient light levels on a display, performing local contrast enhancement processing to emphasize the luminance component based on the detected ambient light levels to provide a processed video signal, and presenting the processed video signal on the display.
    Type: Grant
    Filed: October 25, 2004
    Date of Patent: June 9, 2009
    Assignee: Bose Corporation
    Inventors: Stephen R. O'Dea, Michael O'Connell, William Berardi
  • Patent number: 7515161
    Abstract: A system and method for reducing pulse width modulation contouring artifacts. Each input intensity value is translated to at least one non-binary bit pattern for display. Many of the input intensity values are translated to at least two alternate non-binary bit patterns. The alternate codes are used to smooth the transition between intensity codes as major bits are turned on. The smoothing occurs by the gradual transition from codes that do not use the major bit to codes that do use the major bit. Typically the alternate codes are selected based on the location of the pixel in a spatial pattern (100) and the alternate codes are spatially alternated from one pixel (102) to the next (104). Other embodiments temporally alternate the codes from one period—typically a frame period—to the next. Still other embodiments alternate the codes both spatially and temporally.
    Type: Grant
    Filed: May 17, 2000
    Date of Patent: April 7, 2009
    Assignee: Texas Instruments Incorporated
    Inventor: Daniel J. Morgan
  • Patent number: 7502039
    Abstract: Writing of a digital video signal of a lower order bit into a memory is eliminated during a second display mode in which the number of gradations is reduced as compared to in a first display mode of high-level gradation. In addition, read out of the digital video signal of the lower order bit from the memory is also eliminated. The amount of information of a digital image signal inputted to a source signal line driver circuit is reduced. In accordance with such operation, a display controller functions to make start pulses and clock pulses inputted to the source signal line driver circuit have a lower frequency and to lower a driving voltage. When the gradation is reduced, a frame period in the second display mode may be set longer as compared to that in the first display mode, and therefore low electric power consumption is achieved.
    Type: Grant
    Filed: November 13, 2003
    Date of Patent: March 10, 2009
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Jun Koyama, Hajime Kimura, Yu Yamazaki
  • Patent number: 7502037
    Abstract: A display element 1, provided at each point of intersections of a plurality of signal lines and a plurality of scanning lines, includes an optical modulation element 5 and an active element 2, wherein, when a scanning is carried out not less than once in one field period at a predetermined intervals, a memory element 3 which can store M-bit (M?1) information at the maximum is provided so that the optical modulation element 5 keeps the display with 2M-level gray scale until the next scanning. On this account, it is possible to supply gray scale signal data Dm to the optical modulation element 5 so as to keep the display condition, without attenuating the data after the scanning of pixels. Moreover, since the level of the gray scale display is kept by outputting the information stored in the memory element 3, the gray scale level in each time division sub field can be in concordance with the number of memory bits.
    Type: Grant
    Filed: August 14, 2002
    Date of Patent: March 10, 2009
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Shigetsugu Okamoto
  • Patent number: 7479972
    Abstract: In a display device performing multiple gray level display using a sub-field drive method, an operation rate of a scan driver and a data driver is reduced and power consumption in the circuits are reduced. When 28 levels of gray level display is performed with 8 bits of video data, one field is equally divided by 8 into eight sub-fields to generate a first sub-field SF0 through an eighth sub-field SF7. Each of the sub-fields SF0 through SF7 has an equal length of sub-field period to each other. And a line-sequential addressing is adopted in addressing pixels so that each line of video data is written-in collectively. Addressing operation of the pixels and light emitting operation of the pixels are performed in parallel. Each of addressing periods AP0 through AP7 in each of the sub-fields is approximately equal to the sub-field period, that is a period of one field divided by 8.
    Type: Grant
    Filed: April 13, 2005
    Date of Patent: January 20, 2009
    Assignee: Sanyo Electric Co., Ltd.
    Inventor: Kazumasa Takai
  • Patent number: 7471300
    Abstract: In a spatial light modulator, a frame may be broken up into a plurality of colors. A given frame may include at least a first portion and a second portion. During the first portion of the frame, more significant bits of the data for a given pixel may be displayed and during a second portion of the frame, less significant bits may be disclosed. In some embodiments, the frame may be broken into two color subframes for each color, but in other embodiments, more than two such subframes may be utilized. In one embodiment, the frame may be broken into red, blue, and green and each color may be displayed at least twice, such that more significant bits are displayed first and less significant bits are displayed thereafter.
    Type: Grant
    Filed: January 18, 2005
    Date of Patent: December 30, 2008
    Assignee: Intel Corporation
    Inventor: Thomas E. Willis