Patents by Inventor Jae-Woo Roh

Jae-Woo Roh has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11042063
    Abstract: A display device includes a backlight unit configured to emit light, a display panel disposed in front of the backlight unit, and an optical sheet disposed between the backlight unit and the display panel. The optical sheet may include a first prism sheet including a plurality of first prisms arranged in a first direction, a second prism sheet including a plurality of second prisms arranged in a second direction intersecting the first direction, and disposed in front of the first prism sheet; and a third prism sheet including a plurality of third prisms arranged in the first direction, and disposed in front of the second prism sheet.
    Type: Grant
    Filed: December 19, 2019
    Date of Patent: June 22, 2021
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Sei Young Kang, Seung Jun Jeong, Min Woo Kang, Nam Seok Roh, Kwan Sik Min, Young Chol Lee, Jae Jeong Lee
  • Patent number: 7539116
    Abstract: In a holographic digital data storage system, a light source generates a reference beam, a holographic optical element saves a plurality of interference patterns between the reference beam and a plurality of beams of specific sizes and a beam splitter splits each reproduced beam into a holographic signal beam and a holographic reference beam. A medium records an interference pattern between the holographic reference beam and the holographic signal beam and reflecting the holographic reference beam to generate a reflective information beam and, if only the holographic reference beam is illuminated, a displaying means displays a holographic reproduced beam for the holographic signal beam and detecting the reflective information beam.
    Type: Grant
    Filed: October 18, 2005
    Date of Patent: May 26, 2009
    Assignee: Daewoo Electronics Corporation
    Inventors: Jae-Woo Roh, Jang-Hyun Cho
  • Patent number: 7457016
    Abstract: An optical system capable of selectively processing CD, DVD and holographic digital data is provided. The system includes a beam generation unit providing a linearly polarized light beam; a beam splitter for respectively reflecting and transmitting a first and a second linearly polarized light beam component; an optical sensor; a first beam path through which the first linearly polarized light beam component propagates to serve as a reference beam for the holographic digital data; and a second beam path for accepting the second linearly polarized light beam component, the second light beam component serving as a beam source for reproducing the CD and DVD digital data, wherein a beam carrying digital data reproduced from any one of CD, DVD and holographic storage medium propagates along the second beam path and is reflected by the beam splitter toward the optical sensor.
    Type: Grant
    Filed: June 23, 2005
    Date of Patent: November 25, 2008
    Assignee: Daewoo Electronics Corp.
    Inventor: Jae-Woo Roh
  • Patent number: 7336577
    Abstract: A holographic digital data storage apparatus detects a wobbling in a disc shaped storage medium, wherein the apparatus includes a beam generator and finding means, the disc including therein one or more holographically generated patterns. The beam generator projects at least two wobble detection beams to the holographically generated patterns, the wobble detection beams having different diffraction efficiencies provided at respective characteristic angles, wherein the characteristic angle is an angle between an optical path of one wobble detection beam and that of its corresponding pattern forming beam used in forming one of the holographically generated patterns and a diffraction efficiency is given by a ratio of a power of a diffracted beam of one of the wobble detection beams to a power of said one of the wobble detection beams. The finding means finds at least a difference between the diffraction efficiencies to thereby determine the wobbling in the disc.
    Type: Grant
    Filed: August 17, 2006
    Date of Patent: February 26, 2008
    Assignee: Daewoo Electronics Corporation
    Inventors: Jae-Woo Roh, Jang-Hyun Cho
  • Publication number: 20070237050
    Abstract: There is provided an optical information recording apparatus comprising: a light source; a light modulator in which a reference beam pattern for converting a beam emitted from the light source into a reference beam and a signal beam pattern for converting the beam into a signal beam are formed and varies the reference beam pattern at the time of multiplexing and recording optical information; and a lens allowing optical information to be recorded in an optical information storage medium by means of interference between the reference beam and the signal beam when the signal beam and the reference beam emitted from the light modulator are irradiated to the optical information storage medium. Accordingly, in an optical information processing apparatus using a coaxial optical system, it is possible to more efficiently multiplex optical information and to enhance a storage density of holographic optical information.
    Type: Application
    Filed: July 13, 2006
    Publication date: October 11, 2007
    Applicant: Daewoo Electronics Corporation
    Inventors: Jae-Woo Roh, Joo-Youn Park
  • Publication number: 20060274630
    Abstract: A holographic digital data storage apparatus detects a wobbling in a disc shaped storage medium, wherein the apparatus includes a beam generator and finding means, the disc including therein one or more holographically generated patterns. The beam generator projects at least two wobble detection beams to the holographically generated patterns, the wobble detection beams having different diffraction efficiencies provided at respective characteristic angles, wherein the characteristic angle is an angle between an optical path of one wobble detection beam and that of its corresponding pattern forming beam used in forming one of the holographically generated patterns and a diffraction efficiency is given by a ratio of a power of a diffracted beam of one of the wobble detection beams to a power of said one of the wobble detection beams. The finding means finds at least a difference between the diffraction efficiencies to thereby determine the wobbling in the disc.
    Type: Application
    Filed: August 17, 2006
    Publication date: December 7, 2006
    Inventors: Jae-Woo Roh, Jang-Hyun Cho
  • Patent number: 7113464
    Abstract: A holographic digital data storage apparatus detects a wobbling in a disc shaped storage medium, wherein the apparatus includes a beam generator and finding means, the disc including therein one or more holographically generated patterns. The beam generator projects at least two wobble detection beams to the holographically generated patterns, the wobble detection beams having different diffraction efficiencies provided at respective characteristic angles, wherein the characteristic angle is an angle between an optical path of one wobble detection beam and that of its corresponding pattern forming beam used in forming one of the holographically generated patterns and a diffraction efficiency is given by a ratio of a power of a diffracted beam of one of the wobble detection beams to a power of said one of the wobble detection beams. The finding means finds at least a difference between the diffraction efficiencies to thereby determine the wobbling in the disc.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: September 26, 2006
    Assignee: Daewoo Electronics Corporation
    Inventors: Jae-Woo Roh, Jang-Hyun Cho
  • Patent number: 7055080
    Abstract: A block coding algorithm uses an original block group having n+1 original blocks of m-bit message, which a first original block of m-bit message is encoded as a reference block of n-bit codeword and n original blocks of m-bit message placed after the first original block of m-bit message are encoded as n weighted blocks of n-bit codeword, based on a bit sequence of the reference block. A block decoding algorithm decodes n weighted blocks to generate corresponding original blocks of m-bit message and reconstructs the first original block of m-bit message from a sequence of reference bits, wherein each reference bit implies whether each of n weighted blocks is an A type weighted block or a B type weighted block.
    Type: Grant
    Filed: February 25, 2002
    Date of Patent: May 30, 2006
    Assignee: Daewoo Electronics Corp.
    Inventors: Jae-Woo Roh, Euiseok Hwang
  • Publication number: 20060067195
    Abstract: In a holographic digital data storage system, a light source generates a reference beam, a holographic optical element saves a plurality of interference patterns between the reference beam and a plurality of beams of specific sizes and a beam splitter splits each reproduced beam into a holographic signal beam and a holographic reference beam. A medium records an interference pattern between the holographic reference beam and the holographic signal beam and reflecting the holographic reference beam to generate a reflective information beam and, if only the holographic reference beam is illuminated, a displaying means displays a holographic reproduced beam for the holographic signal beam and detecting the reflective information beam.
    Type: Application
    Filed: October 18, 2005
    Publication date: March 30, 2006
    Inventors: Jae-Woo Roh, Jang-Hyun Cho
  • Patent number: 6999397
    Abstract: In a holographic digital data storage system, a light source generates a reference beam, a holographic optical element saves a plurality of interference patterns between the reference beam and a plurality of beams of specific sizes and a beam splitter splits each reproduced beam into a holographic signal beam and a holographic reference beam. A medium records an interference pattern between the holographic reference beam and the holographic signal beam and reflecting the holographic reference beam to generate a reflective information beam and, if only the holographic reference beam is illuminated, a displaying means displays a holographic reproduced beam for the holographic signal beam and detecting the reflective information beam.
    Type: Grant
    Filed: March 23, 2001
    Date of Patent: February 14, 2006
    Assignee: Daewoo Electronics Corp.
    Inventors: Jae-Woo Roh, Jang-Hyun Cho
  • Patent number: 6980337
    Abstract: A holographic apparatus includes a mask for modulating a signal beam to generate a modulated signal beam; a conical prism, which has a cone portion and a base portion, for refracting a reference beam to generate a refracted reference beam, wherein the refracted reference beam interferes with the modulated signal beam in a holographic medium to thereby record data thereon, the base portion facing the holographic medium. The holographic apparatus can be miniaturized by a positional relationship between the conical prism and the holographic medium.
    Type: Grant
    Filed: March 11, 2004
    Date of Patent: December 27, 2005
    Assignee: Daewoo Electronics Corp.
    Inventor: Jae-Woo Roh
  • Publication number: 20050270957
    Abstract: An optical system capable of selectively processing CD, DVD and holographic digital data is provided. The system includes a beam generation unit providing a linearly polarized light beam; a beam splitter for respectively reflecting and transmitting a first and a second linearly polarized light beam component; an optical sensor; a first beam path through which the first linearly polarized light beam component propagates to serve as a reference beam for the holographic digital data; and a second beam path for accepting the second linearly polarized light beam component, the second light beam component serving as a beam source for reproducing the CD and DVD digital data, wherein a beam carrying digital data reproduced from any one of CD, DVD and holographic storage medium propagates along the second beam path and is reflected by the beam splitter toward the optical sensor.
    Type: Application
    Filed: June 23, 2005
    Publication date: December 8, 2005
    Inventor: Jae-Woo Roh
  • Patent number: 6954554
    Abstract: In a coding method, a (2N?1)st original block of m bits is encoded as an A type weighted block of n bits and a 2Nth original block of m bits is encoded as a B type weighted block of n bits. In a decoding method, if a weighted block of n bits is the A type block, the weighted block of n bits is decoded as the (2N?1)st original block of m bits, and if otherwise, the weighted block of n bits is decoded as the 2Nth original block of m bits.
    Type: Grant
    Filed: January 7, 2002
    Date of Patent: October 11, 2005
    Assignee: Daewoo Electronics Corporation
    Inventor: Jae-Woo Roh
  • Patent number: 6889907
    Abstract: A data input method is applied to a holographic digital data storage system in which sequential binary input data bits are arranged in an interleaved manner among pages. A first data bit is arranged in a specific position of a predetermined page, a second data bit is arranged in a specific position having similar beam intensity with that of the first data bit. Using this method, the holographic digital data storage system can be less affected by the adverse effect of spatial beam intensity variations and makes the entire data interleaved automatically to obtain more stable output data.
    Type: Grant
    Filed: August 27, 2002
    Date of Patent: May 10, 2005
    Assignee: Daewoo Electronics Corporation
    Inventor: Jae-Woo Roh
  • Publication number: 20040218239
    Abstract: A holographic apparatus includes a mask for modulating a signal beam to generate a modulated signal beam; a conical prism, which has a cone portion and a base portion, for refracting a reference beam to generate a refracted reference beam, wherein the refracted reference beam interferes with the modulated signal beam in a holographic medium to thereby record data thereon, the base portion facing the holographic medium. The holographic apparatus can be miniaturized by a positional relationship between the conical prism and the holographic medium.
    Type: Application
    Filed: March 11, 2004
    Publication date: November 4, 2004
    Applicant: Daewoo Electronics Corporation
    Inventor: Jae-Woo Roh
  • Publication number: 20040218241
    Abstract: A volume holographic digital data storage system includes a light source, a beam splitter, a spatial light modulator (SLM), a beam reducer including a beam transmission region and a beam absorption or reflection region, a first actuator, a first reflection mirror, a second reflection mirror, a first lens, a second actuator and a storage medium. By reducing the size of a reference beam through the use of the beam reducer and varying an incident location of the reference beam on the first lens by changing the positions of the beam reducer and the first or second reflection mirror, recording density of a holographic digital data storage system can be greatly increased.
    Type: Application
    Filed: August 27, 2003
    Publication date: November 4, 2004
    Inventor: Jae-Woo Roh
  • Patent number: 6766958
    Abstract: A holographic ROM system includes a light source for emitting a laser beam; an expanding unit for expanding the laser beam; and a mask for modulating a certain portion of the expanded laser beam to thereby generate a signal beam which is directly provided to a holographic medium and sifting the remainder portion of the expanded laser beam to thereby generate a reference beam which is provided to a conical mirror reflecting the reference beam toward the holographic medium. The holographic medium is composed of a recording region onto which both the reference beam and the signal beam are projected; and a transparent region which passes through the reference beam sifted by the mask, to thereby provide the reference beam to the conical mirror.
    Type: Grant
    Filed: July 31, 2003
    Date of Patent: July 27, 2004
    Assignee: Daewoo Electronics Corporation
    Inventor: Jae-Woo Roh
  • Patent number: 6745366
    Abstract: A method for correcting an error in N:N+1 channel codes categorizes 2N+1 codeword (N+1)-tuples into M subsets of codeword (N+1)-tuples, wherein each subset G has NG codeword (N+1)-tuples and the total number of codeword (N+1)-tuples in the M subsets is 2N and wherein each subset G has a predetermined number KG of lower bits and a predetermined number (N+1−KG) of higher bits and the number of lower bits in every codeword (N+1)-tuple in any subset is not equivalent to that of lower bits in every codeword (N+1)-tuple in any other subset. The 2N message N-tuples are mapped with said 2N codeword (N+1)-tuples in the M subsets, respectively, in one-to-one correspondence to generate a lookup table.
    Type: Grant
    Filed: November 21, 2000
    Date of Patent: June 1, 2004
    Assignee: Daewoo Electronics Corporation
    Inventors: Jae-Woo Roh, Byung-Bok Kang
  • Patent number: 6661725
    Abstract: There is provided an apparatus for storing/restoring holographic data and a method for coding/decoding holographic data. In a recording mode, the apparatus divides input data into a plurality of groups, each of which includes two binary digits; and encodes each of the groups into a 2×2 data block wherein a first row of the 2×2 data block has the two binary digits and a second row thereof has another binary digits generated by applying a binary differential calculation on the first row. In a restoring mode, the apparatus divides a signal restored from a storage media into a plurality of 2×2 data blocks; and decodes each of the 2×2 data blocks into two binary digits by comparing values of a first row of the 2×2 data block with those of a second row thereof. In this way, phenomena of isolated “on” or “off” can be avoided.
    Type: Grant
    Filed: July 3, 2002
    Date of Patent: December 9, 2003
    Assignee: Daewoo Electronics Corporation
    Inventor: Jae-Woo Roh
  • Publication number: 20030198158
    Abstract: A holographic digital data storage apparatus detects a wobbling in a disc shaped storage medium, wherein the apparatus includes a beam generator and finding means, the disc including therein one or more holographically generated patterns. The beam generator projects at least two wobble detection beams to the holographically generated patterns, the wobble detection beams having different diffraction efficiencies provided at respective characteristic angles, wherein the characteristic angle is an angle between an optical path of one wobble detection beam and that of its corresponding pattern forming beam used in forming one of the holographically generated patterns and a diffraction efficiency is given by a ratio of a power of a diffracted beam of one of the wobble detection beams to a power of said one of the wobble detection beams. The finding means finds at least a difference between the diffraction efficiencies to thereby determine the wobbling in the disc.
    Type: Application
    Filed: September 25, 2002
    Publication date: October 23, 2003
    Inventors: Jae-Woo Roh, Jang-Hyun Cho