Non-binary Weighted Patents (Class 345/693)
  • Patent number: 9646542
    Abstract: A gate driver circuit includes a gate driver coupled to a gate line. The gate driver generates a gate signal for input to a plurality of pixels and controls a current of the gate signal based on an IR-drop of a supply voltage supplied to the pixels through a supply voltage distribution line. The gate driver decreases the current of the gate signal when the IR-drop increases, and increases the current of the first gate signal when the IR-drop decreases. A pulse width of an activation period of the gate signal decreases and luminance of the pixels increases when the current of the first row pixels decreases.
    Type: Grant
    Filed: April 9, 2015
    Date of Patent: May 9, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventor: Min-Woo Byun
  • Patent number: 9536475
    Abstract: A display device includes first pixels emitting light in a first field and second pixels emitting light in a second field. The first field includes a first compensation period during which threshold voltages of driving transistors of the first pixels are concurrently compensated, a first scan period during which scan signals corresponding to the first pixels are sequentially transmitted and corresponding data signals are programmed, and first light emission periods during which the first pixels concurrently emit light according to the data signals. The second field includes a second compensation period during which threshold voltages of driving transistors of the second pixels are concurrently compensated, a second scan period during which scan signals corresponding to the second pixels are sequentially transmitted and corresponding data signals are programmed, and second light emission periods during which the second pixels concurrently emit light according to the data signals.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: January 3, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventor: Kwang-Sub Shin
  • Patent number: 9019320
    Abstract: An object is to provide a display device that achieves low power consumption and an improved quality of moving and still images. A display device comprises: a display panel provided with a plurality of pixels each including sub-pixels with color filters of red, green, and blue, and a sub-pixel for controlling a transmission of white light; a backlight area including light sources of red, green, blue, and white; an image switch circuit that switches the display panel between a moving image mode and a still image mode; and a display control circuit that controls in the moving image mode a luminance of the light sources of red, green, and blue included in the backlight area, and controls in the still image mode a luminance of a light source of white included in the backlight area.
    Type: Grant
    Filed: April 26, 2011
    Date of Patent: April 28, 2015
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei Yamazaki, Jun Koyama
  • Patent number: 8947475
    Abstract: A process of operating a PWM display system wherein some display data bits are assigned substantially equal time weights. Display data codewords are defined for every pixel intensity value to form display data codeword tables so that there are at least as many display data codeword tables as the number of display data bits with substantially equal time weights. The display pixel is subsequently operated in a digital manner according to the display data codeword in the selected display data codeword table to display a desired pixel intensity value. The display data codeword tables are configured so that immediately adjacent display pixels are operated so that identical pixel intensity values are displayed with different temporal sequences.
    Type: Grant
    Filed: October 25, 2012
    Date of Patent: February 3, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Todd A. Clatanoff, Philip S. King, Jeffrey M. Kempf
  • Patent number: 8884937
    Abstract: A projection apparatus including an image panel, a projection lens, and a control unit is provided. The image panel is configured to provide an image beam and has a displaying area. The projection lens is configured to project the image beam to form an image. When the optical axis of the projection lens is tilted with respect to a normal of the image, the control unit commands a first portion of the displaying area to show a compressed frame corresponding to the image and commands a second portion of the displaying area to show a black border. A projection method is also provided.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: November 11, 2014
    Assignee: Himax Display, Inc.
    Inventors: Chia-Lin Wu, Sheng-Jen Hsiao
  • Patent number: 8780142
    Abstract: An active matrix display device has a column driver circuit for providing pixel drive signals to columns of pixels, and comprising current source circuits. Each current source circuit has a supply switch (78) for controlling the time during which the current source supplies current to or drains current from the column. A mapping means (74) derives from a pixel drive level a digital value which represents a time period for the control of the supply switch (78) of each current source circuit. The mapping means (74) implements a single mapping function for use in providing the digital values for all current source circuits. Having a current source circuit for each column facilitates the application of inversion patterns. The conversion of pixel drive levels to values representing time is carried out in a shared manner, so that the required area is kept to a minimum.
    Type: Grant
    Filed: February 27, 2006
    Date of Patent: July 15, 2014
    Assignee: Innolux Corporation
    Inventors: John Van Den Homberg, Hendrik J. Bergveld, Frans Schoofs
  • Patent number: 8749597
    Abstract: A multi-frame overdriving circuit for use in a liquid crystal display including a counting unit and a multi-frame overdriving unit is provided. The counting unit counts a number m of frame periods for which a pixel data corresponding to a pixel keeps a first gray value, wherein m is a positive integer. When the pixel data changes to a second gray value from the first gray value in a first frame period, the multi-frame overdriving unit respectively outputs y multi-frame overdriving pixel data corresponding to the pixel within successive y frame periods starting from the first frame period. The y multi-frame overdriving pixel data are related to the first gray value, the second gray value and the number m of frame periods, wherein y is a positive integer.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: June 10, 2014
    Assignee: Au Optronics Corp.
    Inventors: Ming-Chi Hung, Chih-Lin Liao, Hung-Min Shih
  • Patent number: 8730391
    Abstract: Determining video content type of a video displayed on a LCD and triggering adjustment in drive power of the LCD based on the video content type. The video content type indicates relative content motion of the video. A video content type detection module is one or combination of a software and a hardware and directs the LCD to be driven relative slower or faster based upon video content. The module independently or in conjunction with another module identifies an active window from a plurality of windows corresponding to a plurality of applications running on the host device and sets the drive power of the LCD based on speed of a video displayed on the active window. The module may also adapt LCD drive power based upon user input and/or remaining battery life.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: May 20, 2014
    Assignee: Broadcom Corporation
    Inventors: Jeyhan Karaoguz, James D. Bennett
  • Patent number: 8717394
    Abstract: A method and system providing boundary dispersion to pixel values displayed on a binary spatial light modulator to reduce temporal contouring artifacts. Pixel code values are offset from a nominal value when displayed on the SLM to disperse a large bit transition for a pulse width modulation (PWM) system. The offset value varies as a function of the pixel digital code, the pixel spatial location on the screen, and pixel temporal location in time. The set of offsets applied to pixels is varied over a repeating sequence of 2 displayed frames.
    Type: Grant
    Filed: July 21, 2008
    Date of Patent: May 6, 2014
    Assignee: Texas Instruments Incorporated
    Inventors: Daniel J. Morgan, Gregory J. Hewlett, Peter F. vanKessel
  • Patent number: 8711188
    Abstract: A reading device includes a computing device and an image input device coupled to the computing device for capturing low resolution images and high resolution images. The reading machine also includes a computer program product residing on a computer readable medium. The medium is in communication with the computing device and includes instructions to operate in a plurality of modes to optimize performance for specific uses of the reading device and process low and high resolution images during operation of at least one of the plurality of modes.
    Type: Grant
    Filed: February 9, 2010
    Date of Patent: April 29, 2014
    Assignee: K-NFB Reading Technology, Inc.
    Inventors: Raymond C. Kurzweil, Paul Albrecht, James Gashel, Lucy Gibson
  • Patent number: 8665252
    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: April 3, 2012
    Date of Patent: March 4, 2014
    Assignee: Texas Instruments Incorporated
    Inventor: Todd A. Clatanoff
  • Patent number: 8624806
    Abstract: A pixel circuit and an organic light-emitting diode (OLED) display using the pixel circuit is provided. The pixel circuit includes: an OLED; a third N-channel metal-oxide semiconductor (NMOS) transistor coupled to a data line and a first scan line and configured to apply a data signal to a first node; a storage capacitor having one terminal coupled to the first node and the other terminal coupled to a second node; a fourth NMOS transistor coupled between a first power and the second node and configured to apply a voltage of the first power to the second node; a first NMOS transistor having a first electrode, a second electrode, and a gate electrode coupled to the second node; and a second NMOS transistor coupled between the second node and the first electrode of the first NMOS transistor and configured to diode-connect the first NMOS transistor.
    Type: Grant
    Filed: March 2, 2010
    Date of Patent: January 7, 2014
    Assignee: Samsung Display Co, Ltd.
    Inventors: Bo-Yong Chung, Keum-Nam Kim
  • Patent number: 8576206
    Abstract: The present invention relates to a phase modulating apparatus capable of highly accurately and easily correcting the phase modulation characteristic of a reflective electric address spatial light modulator even when a condition of input light is changed. In the LCOS phase modulating apparatus, an input unit inputs the condition of the input light, and a processing unit sets an input value for each pixel. A correction value deriving unit determines a correction condition according to the condition of the input light. A control input value converting unit converts the input value set for each pixel into a corrected input value based on the correction condition. An LUT processing unit converts the corrected input value into a voltage value, and drives each pixel by using a drive voltage equivalent to the converted voltage value.
    Type: Grant
    Filed: December 4, 2008
    Date of Patent: November 5, 2013
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Naoya Matsumoto, Norihiro Fukuchi, Takashi Inoue, Yasunori Igasaki
  • Patent number: 8537182
    Abstract: Disclosed herein is a light emitting period setting method for a display panel wherein the peak luminance level is varied through control of a total light emitting period length which is the sum total of period lengths of light emitting periods arranged in a one-field period, including a step of setting period lengths of N light emitting periods, which are arranged in a one-field period, in response to the total light emitting period length such that the period lengths of the light emitting periods continue to keep a fixed ratio thereamong, N being equal to or higher than 3.
    Type: Grant
    Filed: March 14, 2012
    Date of Patent: September 17, 2013
    Assignee: Sony Corporation
    Inventors: Hiroshi Hasegawa, Teppei Isobe, Hironobu Abe
  • Patent number: 8482508
    Abstract: A LCD display device includes a LCD panel including a plurality of LCD units with trapezoid structure, and three sides of the LCD unit all include three liquid crystal molecules (LCM), the LCMs of all of the first side of the LCD unit constitute a first LCM array and form a first display interface, the LCMs of all of the second side constitute a second LCM array and form a second display interface, and the LCMs of all of the third side constitute a third LCM array and form a third display interface. The LCD display device also includes three signal conversion modules configured to convert three display signals into three control signals respectively, and three driving modules configured to drive the three LCM arrays according to the control signals and cause the first, the second, and the third display interface to display corresponding images.
    Type: Grant
    Filed: October 25, 2009
    Date of Patent: July 9, 2013
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Shih-Fang Wong, Xin Lu, Yu-Cui Zhou
  • Patent number: 8456395
    Abstract: A panel adjustment method is executed on a host to adjust settings of a panel connected to the host through a serial bus. The method determines whether the panel is supported by the host. When the panel is supported by the host, the settings of the panel is read from a database of the host to accordingly set the panel. It is further determined whether the panel is correctly set or not. When the panel is correctly set, it is further determined whether the panel is of a frame buffer mode or not. When the panel is of a frame buffer mode, it is determined whether a header file generation is required or not. When the header file generation is required, the settings and a panel name are included in an include file. The include file is compiled to thereby generate a binary file which is loaded into the panel.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: June 4, 2013
    Assignee: Sunplus Technology Co., Ltd.
    Inventor: Tsung-I Liu
  • Patent number: 8456494
    Abstract: Disclosed embodiments utilize MIP techniques to determine optimum bit sequences that minimize PWM artifacts. The problem would first be restructured and redefined into a form suitable for MIP. An objective function designed to minimize PWM artifacts would allow for evaluation of resulting bit sequences in order to determine optimality. Constraints (that relate the inputs and variables) are developed. These constraints would determine whether a particular bit sequence can be used on a given system, and whether a particular bit sequence would satisfy any user defined rules. Once these are determined, an MIP solver would generate an optimized bit sequence(s). Only bit sequences that satisfy the constraints would be evaluated using the objective function, allowing for a quicker determination of a solution. This MIP solution may be generated quickly, allowing for a shorter production period while still optimizing the bit sequences to minimize PWM artifacts.
    Type: Grant
    Filed: December 30, 2006
    Date of Patent: June 4, 2013
    Assignee: Texas Instruments Incorporated
    Inventors: Andrew I. Russell, Gregory J. Hewlett
  • Patent number: 8421828
    Abstract: A display device and modulation scheme for applying image data to an imager. The display may use a modulation scheme wherein spacing of row write actions on the rows creates gray scale modulation, wherein one row spacing between sequential row write actions is at a first distance while another row spacing between sequential row write actions is at a distance greater than said first distance. The modulation scheme may create a series of write pointers that create a corresponding series of write planes. In some embodiments, modulation efficiency is increased allowing the use of lower frequency imaging circuits to achieve the same display image.
    Type: Grant
    Filed: May 9, 2003
    Date of Patent: April 16, 2013
    Assignee: Jasper Display Corp.
    Inventors: Edwin Lyle Hudson, David Charles McDonald
  • Patent number: 8339428
    Abstract: A novel method for driving a display includes the steps of defining a modulation period during which a particular intensity value is asserted on a pixel of the display, dividing the modulation period into a plurality of coequal time intervals, receiving a data word, which includes a plurality of equally-weighted bits and is indicative of an intensity value to be displayed by the pixel, updating a signal asserted on the pixel during each of a plurality of consecutive time intervals during a first portion of the modulation period, and updating the signal asserted on the pixel every mth time interval during a second portion of the modulation period, where m is equal to the weight of each of the equally-weighted bits. The data word can either be composed of two groups of equally-weighed bits, or a combination of binary bits and equally-weighted. The invention also includes a novel display driver for executing the driving methods.
    Type: Grant
    Filed: March 19, 2008
    Date of Patent: December 25, 2012
    Assignee: OmniVision Technologies, Inc.
    Inventor: Sunny Yat-san Ng
  • Patent number: 8319705
    Abstract: The plasma display device has a display panel having first and second display electrodes and address electrodes, an electrode drive circuit, and a drive control circuit for controlling the electrode drive circuit. The drive control circuit performs a reset drive control, address drive control and sustain drive control in each subfield. The drive control circuit performs an all cell reset drive control which resets all cells in a first subfield out of the plurality of subfields, and an ON cell reset drive control which resets ON cells in a second subfield. At a first temperature T1, an ultimate potential of an slope pulse of the first display electrode is controlled to be a first potential in the ON cell reset drive control, and at a second temperature T2>T1, the ultimate potential is controlled to be a second potential higher than the first potential.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: November 27, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Junichi Kumagai, Katsumi Ito
  • Patent number: 8305404
    Abstract: One field is divided into p (p is an integer of 2 or more) groups and each of the divided groups is divided into two subfields. The p groups have the same time period. The sub-fields forming one field have time periods that are different from each other. A plurality of scanning lines are divided into at least first and second groups. A field start timing of pixels corresponding to the scanning lines of the first group is set to be different from a field start timing of pixels corresponding to scanning lines of the second group by at least the time period of the groups.
    Type: Grant
    Filed: June 3, 2008
    Date of Patent: November 6, 2012
    Assignee: Seiko Epson Corporation
    Inventor: Hiroyuki Hosaka
  • Patent number: 8243093
    Abstract: Aspects of the present invention relate to creation, modification and implementation of dither pattern structures applied to an image to diminish contouring artifacts. Some aspects relate to dither pattern structures with pixel values in a first color channel pattern that are spatially dispersed from pixel values in a corresponding pattern in a second color channel. Some aspects relate to application. Some aspects relate to systems and apparatus for creation and application of these dither pattern structures comprising pixel values dispersed across color channels.
    Type: Grant
    Filed: August 22, 2003
    Date of Patent: August 14, 2012
    Assignee: Sharp Laboratories of America, Inc.
    Inventors: Xiao-Fan Feng, Scott J. Daly
  • Patent number: 8237750
    Abstract: A method and apparatus are provided for correcting burn-in in a flat screen display. The method includes the steps of determining a maximum cumulative luminance of each pixel (15) within the display (14) based upon a usage of the pixel, providing a modulation map (40) of the display (14) from the maximum cumulative luminance of each pixel (15) within the display (14), transforming the modulation map (40) based upon the maximum cumulative luminance of groups of adjacent pixels to provide a modulation index for each pixel location of the map (40), comparing the modulation indexes with a set of threshold values and adjusting a luminosity of associated pixels (15) of the display (40) when the modulation index exceeds the threshold.
    Type: Grant
    Filed: October 23, 2008
    Date of Patent: August 7, 2012
    Assignee: Motorola Mobility, Inc.
    Inventors: Robert D. Polak, Andrew N. Cady, Tomohiro Ishikawa
  • Patent number: 8237756
    Abstract: A novel method for driving a display having an array of pixels arranged in a plurality of columns and a plurality of rows includes the steps of defining a modulation period for a row of pixels, dividing the modulation period into a number of coequal time intervals equal to n times the number of rows in the array, receiving a multi-bit data word that indicates an intensity value, and updating the signal asserted on the pixel during a plurality of the time intervals such that the intensity value is displayed by the pixel. Note that n is an integer greater than zero. The method can be applied to all rows, which can be driven asynchronously. A display driver for performing the novel methods is also disclosed. The present invention facilitates driving the display at 100% bandwidth efficiency during each time interval in the modulation period.
    Type: Grant
    Filed: January 28, 2008
    Date of Patent: August 7, 2012
    Assignee: OmniVision Technologies, Inc.
    Inventors: Kin Yip Kenneth Kwan, Andrea Nguyen, Sunny Yat-san Ng, William K. Zuravleff
  • Patent number: 8228356
    Abstract: A novel method for driving a display having an array of pixels arranged in a plurality of columns and a plurality of rows includes the steps of defining a modulation period for a row of pixels, dividing the modulation period into a number of coequal time intervals equal to n times the number of rows in the array, receiving a multi-bit data word that indicates an intensity value, and updating the signal asserted on the pixel during a plurality of the time intervals such that the intensity value is displayed by the pixel. Note that n is an integer greater than zero. The method can be applied to all rows, which can be driven asynchronously. A display driver for performing the novel methods is also disclosed. The present invention facilitates driving the display at 100% bandwidth efficiency during each time interval in the modulation period.
    Type: Grant
    Filed: January 28, 2008
    Date of Patent: July 24, 2012
    Assignee: OmniVision Technologies, Inc.
    Inventors: Kin Yip Kenneth Kwan, Andrea Nguyen, Sunny Yat-san Ng, William K. Zuravleff
  • 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: 8223179
    Abstract: A novel method for driving a display having an array of pixels arranged in a plurality of columns and a plurality of rows includes the steps of defining a modulation period for a row of pixels, dividing the modulation period into a number of coequal time intervals equal to n times the number of rows in the array, receiving a multi-bit data word that indicates an intensity value, and updating the signal asserted on the pixel during a plurality of the time intervals such that the intensity value is displayed by the pixel. Note that n is an integer greater than zero. The method can be applied to all rows, which can be driven asynchronously. A display driver for performing the novel methods is also disclosed. The present invention facilitates driving the display at 100% bandwidth efficiency during each time interval in the modulation period.
    Type: Grant
    Filed: July 27, 2007
    Date of Patent: July 17, 2012
    Assignee: OmniVision Technologies, Inc.
    Inventors: Kin Yip Kenneth Kwan, Andrea Nguyen, Sunny Yat-san Ng, William K. Zuravleff
  • 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: 8184088
    Abstract: An image display apparatus includes: a luminance modification unit configured to modify the luminance setting value so as to make a luminance difference between adjacent partial regions of a back light smaller; a luminance distribution calculation unit configured to calculate a predicted value of luminance distribution of light incident on a liquid crystal panel from the back light on the basis of the modified luminance setting value; a liquid crystal transmittance correction unit configured to correct an optical transmittance of the image signal at each pixel of the liquid crystal panel on the basis of the image signal and the luminance distribution; a back light control unit configured to control the back light on the basis of the modified luminance setting value; and a liquid crystal control unit configured to control the liquid crystal panel so that the transmittance of the image signal becomes the corrected optical transmittance.
    Type: Grant
    Filed: December 2, 2008
    Date of Patent: May 22, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Ryosuke Nonaka, Masahiro Baba, Goh Itoh
  • 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: 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: 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: 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: 7755651
    Abstract: It is an object to provide a driving method of a display device capable of reducing pseudo contours while increase in the number of sub-frames is suppressed as much as possible. In a driving method of a display device where one frame is divided into a plurality of sub-frames to display a gray scale, the plurality of sub-frames has a plurality of middle-order sub-frames each of which has a middle-degree weighting and is used for an overlapping time gray scale method, at least one high-order sub-frame which has a larger weighting than that of the middle-order sub-frame and is used for a binary code time gray scale method, and at least one low-order sub-frame which has a smaller weighting than that of the middle-order sub-frame and is used for a binary code time gray scale method.
    Type: Grant
    Filed: January 16, 2007
    Date of Patent: July 13, 2010
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Hajime Kimura
  • Patent number: 7733358
    Abstract: In a display device having a light source and a storage for storing at least one reference frame of image data, a driving method includes receiving a current frame of image data; comparing grey levels between pixels of the current frame of image data and the corresponding pixels of the reference frame of image data; determining a pixel quantity of pixels having different grey levels in the current frame of image data and the reference frame of image data; and based on the determined pixel quantity, calculating and outputting a signal controlling a light emitting duty ratio and an amplitude of the light source while displaying the current frame. The display device further has a comparing unit and light source control unit for performing the driving method.
    Type: Grant
    Filed: December 12, 2005
    Date of Patent: June 8, 2010
    Assignee: Chi Mei Optoelectronics Corp.
    Inventor: Ying-Hao Hsu
  • 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: 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: 7602374
    Abstract: Edge effects in electro-optic displays are reduced by (a) ensuring that during rewriting of the display, the last period of non-zero voltage applied all pixels terminates at substantially the same time; and (b) scanning the display at a scan rate of at least 50 Hz.
    Type: Grant
    Filed: September 17, 2004
    Date of Patent: October 13, 2009
    Assignee: E Ink Corporation
    Inventors: Robert W. Zehner, Karl R. Amundson
  • Patent number: 7545396
    Abstract: A novel method for asynchronously driving a display device including a plurality of pixels arranged in a plurality of columns and a plurality of rows includes the steps of receiving a first multi-bit data word indicative of a first grayscale value to be displayed on a pixel of a first row of the display, defining a first time period during which an electrical signal corresponding to the first grayscale value can be asserted on the pixel of said first row, receiving a second multi-bit data word indicative of a second grayscale value to be displayed on a pixel of a second row of the display, and defining a second time period that is temporally offset from the first time period during which an electrical signal corresponding to the second grayscale value can be asserted on the pixel of said second row. A novel display driver for performing the methods of the present invention is also disclosed.
    Type: Grant
    Filed: June 16, 2005
    Date of Patent: June 9, 2009
    Assignee: Aurora Systems, Inc.
    Inventor: Sunny Yat-san Ng
  • 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
  • Publication number: 20090079769
    Abstract: A display device includes a data converting section that converts display data that is to be supplied to pixel units. The data converting section converting on the basis of a predetermined conversion rule for each of a plurality of fields. The plurality of fields corresponds to respective light emission time periods of the plurality of light beams and following one after another in a successive manner on a time axis. The predetermined conversion rule converts data for a preceding field of one color to achieve a value in a successive field of a different color, such that the value approaches a desired value for at least one of brightness and color obtained when an image is displayed in the display area during the successive field.
    Type: Application
    Filed: August 8, 2008
    Publication date: March 26, 2009
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hidehito IISAKA, Hiroyuki HOSAKA
  • 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: 7499065
    Abstract: A method and apparatus of the present invention is particularly for use in display systems having spatial light modulators in which the pixels present asymmetrical switching delays. For a desired illumination intensity of a pixel, a series of pulse-width-modulation bit values for the pixel is determined based at least in part upon a parameter that characterizes the asymmetrical transition behavior of the pixel between states.
    Type: Grant
    Filed: June 11, 2004
    Date of Patent: March 3, 2009
    Assignee: Texas Instruments Incorporated
    Inventor: Peter Richards
  • Patent number: 7483043
    Abstract: A method and system for performing spatial temporal multiplexing using a multi-threshold mask. A mask generator (404) outputs a threshold value for each pixel of a display. The mask generator typically creates a blue noise mask for a given pixel array that is replicated over the face of the entire display. The blue noise mask generator (404) typically is implemented as a memory lookup table. An index generator (402) provides an offset into the memory lookup table that allows the table to be shifted from time to time. The output of the blue noise mask generator (404), which may be the threshold value itself or a signal representing which threshold is being used, is an input to a selective inverter (406). The selective inverter (406) provides the option of inverting the blue noise mask. To reduce artifacts, the mask is periodically shifted and/or inverted. The value from the mask generator (404), whether inverted or not, is compared to the LSBs of the input data word to yield the fractional bit values.
    Type: Grant
    Filed: May 22, 2006
    Date of Patent: January 27, 2009
    Assignee: Texas Instruments Incorporated
    Inventors: Daniel J. Morgan, Jeffrey M. Kempf
  • Patent number: 7456853
    Abstract: Display structures and methods are provided that introduce redundancy and use this redundancy with different mapping rules on different interleaved display lines to visually diffuse display artifacts. The artifacts are typically produced by errors in the transmission and recovery of analog display signals that subsequently drive digital displays. This visual diffusion substantially reduces the display artifacts and, because these visual improvements require only one element (an ADC) in the display system to be configured at a higher resolution, the visual advantageous are realized with relatively low cost.
    Type: Grant
    Filed: October 22, 2004
    Date of Patent: November 25, 2008
    Assignee: Analog Devices, Inc.
    Inventor: Willard Kraig Bucklen
  • Publication number: 20080231936
    Abstract: A display system includes a spatial light modulator for displaying a image by the modulation state of a plurality of micromirrors, and a control device for controlling the spatial light modulator. The control device includes a data conversion device for converting the digital image data into non-binary data, and a modulation-control device for generating a modulation control signal for micromirrors depending on the non-binary data, and controlling the spatial light modulator. The modulation state of the micromirrors by the modulation control signal includes modulation by oscillation of the micromirrors. The modulation control signal controls amplitude of the oscillation to be smaller than the maximum amplitude of the micromirrors in the modulation by the oscillation of the micromirrors. The oscillation having smaller amplitude than the maximum amplitude of the micromirrors is repeated by the modulation control signal in an optional time duration or frequency.
    Type: Application
    Filed: March 1, 2008
    Publication date: September 25, 2008
    Inventors: Taro Endo, Yoshihiro Maeda, Kazuma Arai, Fusao Ishii