Patents by Inventor Yong-Kyu Jang

Yong-Kyu Jang 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).

  • Publication number: 20110090417
    Abstract: In a liquid crystal display with improved side visibility and a fabrication method of the liquid crystal display, a unit pixel may include first and second sub-pixels in which liquid crystals are continuously aligned and electrically isolated. A first pixel electrode for implementing the first sub-pixel is formed on a protective layer. A second pixel electrode for implementing the second sub-pixel is formed beneath the protective layer. The protective layer formed on the second pixel electrode lowers the electric field of the second sub-pixel, so that a liquid crystal application voltage applied to the second sub-pixel is lower than the voltage applied to the first sub-pixel. Accordingly, the transmittances of the first and second sub-pixels in the unit pixel are different from each other to improve side visibility.
    Type: Application
    Filed: March 4, 2010
    Publication date: April 21, 2011
    Inventors: Gee-Bum Kim, Jae-Hyun Kim, Yong-Kyu Jang
  • Patent number: 7929082
    Abstract: Disclosed is a transmissive and reflective type LCD. In the LCD, a second substrate faces a first substrate. A liquid crystal layer is formed between the first substrate and the second substrate. A first polarizing plate is formed on an outer surface of the first substrate. A second polarizing plate is formed on an outer surface of the second substrate. A backlight is arranged for irradiating incident light onto the polarizing plate. A transparent transflective film is arranged between the first polarizing plate and the backlight for partially reflecting and partially transmitting the incident light. The transparent transflective film includes at least a first layer and a second layer, the first and second layers having different refractivity indexes from each other and are alternatively stacked.
    Type: Grant
    Filed: November 10, 2004
    Date of Patent: April 19, 2011
    Assignee: Samsung Electronics, Co., Ltd.
    Inventors: Yong-Kyu Jang, Hyung-Guel Kim
  • Patent number: 7898618
    Abstract: In an LCD apparatus, a reflecting plate, which is formed on a pixel electrode connected to a switching device formed on an array substrate, defines a first area from which a natural light is reflected and a second area through which an artificial light is transmitted. The reflecting plate is partially extended to and overlapped with the second area depending upon a rubbing direction of the array substrate. Thus, the reflective-transmissive type LCD apparatus may prevent occurrence of the afterimage, and may enhance a contrast ratio thereof when operated in a transmissive mode.
    Type: Grant
    Filed: March 12, 2004
    Date of Patent: March 1, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jae-Hyun Kim, Sang-Woo Kim, Jae-Young Lee, Yong-Kyu Jang, Sung-Eun Cha
  • Publication number: 20100201931
    Abstract: A display device may include a first substrate, a second substrate, and a liquid crystal layer. The first substrate may include a domain-forming layer including a depression pattern for forming a liquid crystal domain in a pixel area and a pixel electrode formed on the domain-forming layer. The second substrate may face the first substrate. The second substrate may include a common electrode formed on the entire surface thereof. The liquid crystal layer may be disposed between the first substrate and the second substrate. The liquid crystal layer may include a reactive mesogen (RM) which fixes liquid crystal molecules formed in the liquid crystal domain. Since a liquid crystal domain may be formed without a separate pattern on a common electrode, a display device having an enhanced aperture ratio and an enhanced viewing angle may be manufactured.
    Type: Application
    Filed: December 10, 2009
    Publication date: August 12, 2010
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Yong-Kyu Jang, Jae-Young Lee, Seong-Jun Lee, Yi Li
  • Publication number: 20100157209
    Abstract: A liquid crystal display having improved retardation plate is described. In the liquid crystal display, at least one of two panel plates has a polarizer placed on an outer side which is opposite to a liquid crystal layer and a quarter wavelength retardation plate between a substrate glass and the polarizer. The quarter wavelength retardation plate is composed of two retardation films including a half wavelength and a quarter wavelength retardation film. A slow axis of a half ? film which is adjacent to the polarizer makes an angle of ?1 with a transmissive axis of the polarizer and that of a quarter ? film which is adjacent to the substrate glass makes an angle of ?2 where ?2=2×?1±45 degree. The retardation films are single-axial films. The specific angle ?1 is one of degree values (15, 75, 105, and 165).
    Type: Application
    Filed: March 12, 2010
    Publication date: June 24, 2010
    Inventor: YONG-KYU JANG
  • Publication number: 20100157236
    Abstract: A reflective-transmissive liquid crystal display (LCD) device with an improved display quality is achieved by forming a reflective area and a transmissive area having a cell gap greater than greater than that of the reflective area. A liquid crystal layer is disposed in a liquid crystal cell between the first and second substrates. The liquid crystal molecules are normally aligned at an angle equal to greater than about 45° with respect to a line parallel to the first substrate. The LCD device operates in a normally black mode.
    Type: Application
    Filed: March 12, 2010
    Publication date: June 24, 2010
    Inventors: YONG-KYU JANG, WON-SANG PARK, JAE-HYUN KIM, SANG-WOO KIM, SUNG-EUN CHA, JAE-YOUNG LEE
  • Publication number: 20100118220
    Abstract: A display device, including a lower substrate; an upper substrate disposed opposite to the lower substrate; a liquid crystal layer interposed between the lower substrate and the upper substrate; and a plurality of pixels, each of the pixels including at least one reflective electrode and at least one transparent electrode; the reflective electrodes and the transparent electrodes disposed on the lower substrate and electrically insulated from each other, wherein a reflective region corresponds to a region of the reflective electrodes and a transmissive region corresponds to a region of the transparent electrodes, and when a display luminance in the reflective region and the transmissive region is increased, a first voltage applied to the liquid crystal layer in one of the reflective region and the transmissive region is increased and a second voltage applied to the liquid crystal layer in the other of the reflective region and the transmissive region is decreased.
    Type: Application
    Filed: May 1, 2009
    Publication date: May 13, 2010
    Applicant: SAMSUNG ELECTRONICS CO. LTD.
    Inventors: Yong-Kyu JANG, Sang-Jin PAK
  • Patent number: 7688405
    Abstract: A reflective-transmissive liquid crystal display (LCD) device with an improved display quality is achieved by forming a reflective area and a transmissive area having a cell gap greater than greater than that of the reflective area. A liquid crystal layer is disposed in a liquid crystal cell between the first and second substrates. The liquid crystal molecules are normally aligned at an angle equal to greater than about 45° with respect to a line parallel to the first substrate. The LCD device operates in a normally black mode.
    Type: Grant
    Filed: July 9, 2004
    Date of Patent: March 30, 2010
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Yong-Kyu Jang, Won-Sang Park, Jae-Hyun Kim, Sang-Woo Kim, Sung-Eun Cha, Jae-Young Lee
  • Publication number: 20100066963
    Abstract: A display device having a gate line on a first substrate, a gate insulating layer covering the gate line, a semiconductor layer on the gate insulating layer, a data line intersecting the gate line and including a source electrode and a drain electrode facing the source electrode on the semiconductor layer, a connection assistant separated from the data line, a passivation layer covering the data line and including contact holes exposing the connection assistant and a pixel electrode, including a plurality of sub-pixel electrodes, and formed on the passivation layer. The sub-pixel electrodes are electrically connected to each other through the connection assistant and at least one of the sub-pixel electrodes is electrically connected to the drain electrode. The connection assistant is connected to facing edges of adjacent sub-pixel electrodes and is disposed at about ¼ the distance from the end of the left or the right side of the sub-pixel electrode.
    Type: Application
    Filed: September 16, 2009
    Publication date: March 18, 2010
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jaehoon HWANG, Yong-Kyu Jang, Sang-Woo Kim, Ae Shin, Chang-Woo Shim
  • Patent number: 7659541
    Abstract: A liquid crystal display, in accordance with the present invention, includes a first substrate having a thin film transistor and a first electrode formed thereon. The first electrode is electrically connected to the thin film transistor. A first insulating layer is formed on the first substrate including the thin film transistor and the first electrode and a window is formed in the first insulating layer, the window exposing a predetermined region of the first electrode. A second electrode is provided on the first insulating layer and electrically connected to the first electrode. A second substrate includes a third electrode formed thereon. A first gap is formed between a surface of the third electrode and a surface of the predetermined region of the first electrode, and a second gap is formed between the surface of the third electrode and a surface of the second electrode. A liquid crystal layer is interposed between the first gap and the second gap.
    Type: Grant
    Filed: April 25, 2007
    Date of Patent: February 9, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yong-Kyu Jang, Jae-Hyun Kim, Sang-Woo Kim, Jae-Young Lee, Sung-Eun Cha, Young-Nam Yun
  • Patent number: 7622147
    Abstract: In a liquid crystal display apparatus, a lower substrate has a transmissive electrode formed in a transmissive area of a first substrate and a reflective electrode formed in a reflective area of the first substrate. An upper substrate has a second substrate, a first insulating layer formed on the second substrate corresponding to the transmissive area, a common electrode formed on the first insulating layer and the second substrate corresponding to the reflective area, and a second insulating layer formed on the common electrode corresponding to the reflective area. Accordingly, the liquid crystal display apparatus may have a uniform cell gap, thereby improving a reflectance and a transmittance thereof.
    Type: Grant
    Filed: May 27, 2008
    Date of Patent: November 24, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Won-Sang Park, Kee-Han Uh, Yong-Kyu Jang, Sang-Woo Park, Sang-Woo Kim, Sung-Eun Cha, Jae-Young Lee, Jae-Hyun Kim
  • Publication number: 20090122251
    Abstract: A liquid crystal display having improved retardation plate is described. In the liquid crystal display, at least one of two panel plates has a polarizer placed on an outer side which is opposite to a liquid crystal layer and a quarter wavelength retardation plate between a substrate glass and the polarizer. The quarter wavelength retardation plate is composed of two retardation films including a half wavelength and a quarter wavelength retardation film. A slow axis of a half ? film which is adjacent to the polarizer makes an angle of ?1 with a transmissive axis of the polarizer and that of a quarter ? film which is adjacent to the substrate glass makes an angle of ?2 where ?2=2×?1±45 degree. The retardation films are single-axial films. The specific angle ?1 is one of degree values (15, 75, 105, and 165).
    Type: Application
    Filed: December 18, 2008
    Publication date: May 14, 2009
    Inventor: Yong-Kyu JANG
  • Patent number: 7522240
    Abstract: A liquid crystal display having improved retardation plate is described. In the liquid crystal display, at least one of two panel plates has a polarizer placed on an outer side which is opposite to a liquid crystal layer and a quarter wavelength retardation plate between a substrate glass and the polarizer. The quarter wavelength retardation plate is composed of two retardation films including a half wavelength and a quarter wavelength retardation film. A slow axis of a half ? film which is adjacent to the polarizer makes an angle of ?1 with a transmissive axis of the polarizer and that of a quarter ? film which is adjacent to the substrate glass makes an angle of ?2 where ?2=2×?1±45 degree. The retardation films are single-axial films. The specific angle ?1 is one of degree values (15, 75, 105, and 165).
    Type: Grant
    Filed: May 22, 2000
    Date of Patent: April 21, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Yong-Kyu Jang
  • Patent number: 7450203
    Abstract: The invention is directed to a liquid crystal display and assembly without a contact hole in the reflective layer. By eliminating the contact hole, the overall reflectance of the apparatus is increased. In order to prevent light leakage and afterimage, the invention includes an interface electrode that is strategically positioned over where light leakage occurs. An exemplary display apparatus includes a first substrate having a reflective region and a transmissive region including a transparent electrode, a second substrate including a transparent common electrode, a liquid crystal layer located between the first substrate and the second substrate, and a thin film transistor. The tin film transistor includes a gate electrode, a source electrode, and a drain electrode, and the gate electrode is located in the reflective region. Either the source electrode or the drain electrode contacts the transparent electrode between the reflective region and the transmissive region.
    Type: Grant
    Filed: August 18, 2006
    Date of Patent: November 11, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jae-Hyun Kim, Yong-Kyu Jang, Won-Sang Park, Sang-Woo Kim, Young-Ok Cha, Sung-Eun Cha, Jae-Young Lee
  • Patent number: 7450199
    Abstract: Disclosed is a reflection type liquid crystal display (LCD) and a manufacturing method thereof. A first substrate on which a pixel array is formed is prepared. A second substrate is formed facing the first substrate. A liquid crystal layer is formed between the first and second substrates. A reflective electrode is formed on the first substrate. The reflective electrode includes a plurality of first regions and a plurality of second regions having a height difference relative to the first regions, in which a first total sum in length components of the second regions arranged along a direction perpendicular to a first direction is greater than a second total sum in length components of the second regions arranged along a direction perpendicular to a second direction such that the second regions have higher reflectivity in the first direction relative to the second direction.
    Type: Grant
    Filed: April 3, 2007
    Date of Patent: November 11, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yong-Kyu Jang, Kee-Han Uh, Jae-Hyun Kim, Bang-Sil Choi
  • Publication number: 20080248190
    Abstract: In a liquid crystal display apparatus, a lower substrate has a transmissive electrode formed in a transmissive area of a first substrate and a reflective electrode formed in a reflective area of the first substrate. An upper substrate has a second substrate, a first insulating layer formed on the second substrate corresponding to the transmissive area, a common electrode formed on the first insulating layer and the second substrate corresponding to the reflective area, and a second insulating layer formed on the common electrode corresponding to the reflective area. Accordingly, the liquid crystal display apparatus may have a uniform cell gap, thereby improving a reflectance and a transmittance thereof.
    Type: Application
    Filed: May 27, 2008
    Publication date: October 9, 2008
    Inventors: Won-Sang PARK, Kee-Han Uh, Yong-Kyu Jang, Sang-Woo Park, Sang-Woo Kim, Sung-Eun Cha, Jae-Young Lee, Jae-Hyun Kim
  • Patent number: 7417700
    Abstract: A liquid crystal display panel includes a liquid crystal layer having a twist angle of ±10 degree. An upper polarizer is disposed over an upper substrate of the liquid crystal display panel, and includes an absorption axis forming at an angle of 47±10 degree in a clockwise direction with respect to a major axis. An upper ?/2 retardation film is disposed between the upper substrate and the upper polarizer, and includes ?nd1 of 260±10 nm and a slow axis forming at an angle of 166±10 degree in the clockwise direction with respect to the absorption axis. An upper ?/4 retardation film is disposed between the upper substrate and the upper ?/2 retardation film, and includes ?nd2 of 140±10 nm and a slow axis forming at an angle of 111±10 degree in the clockwise direction with respect to the absorption axis. Therefore, the optical condition of the optical film assembly is optimized to improve an image display quality.
    Type: Grant
    Filed: September 21, 2007
    Date of Patent: August 26, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yong-Kyu Jang, Won-Sang Park, Jae-Hyun Kim, Sang-Woo Kim, Sung-Eun Cha, Jae-Young Lee
  • Patent number: 7414684
    Abstract: Disclosed is a transmissive and reflective type LCD. In the LCD, a second substrate faces a first substrate. A liquid crystal layer is formed between the first substrate and the second substrate. A first polarizing plate is formed on an outer surface of the first substrate. A second polarizing plate is formed on an outer surface of the second substrate. A backlight is arranged for irradiating incident light onto the polarizing plate. A transparent transflective film is arranged between the first polarizing plate and the backlight for partially reflecting and partially transmitting the incident light. The transparent transflective film includes at least a first layer and a second layer, the first and second layers having different refractivity indexes from each other and are alternatively stacked.
    Type: Grant
    Filed: November 10, 2004
    Date of Patent: August 19, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yong-Kyu Jang, Hyung-Guel Kim
  • Patent number: 7379134
    Abstract: In a liquid crystal display apparatus, a lower substrate has a transmissive electrode formed in a transmissive area of a first substrate and a reflective electrode formed in a reflective area of the first substrate. An upper substrate has a second substrate, a first insulating layer formed on the second substrate corresponding to the transmissive area, a common electrode formed on the first insulating layer and the second substrate corresponding to the reflective area, and a second insulating layer formed on the common electrode corresponding to the reflective area. Accordingly, the liquid crystal display apparatus may have a uniform cell gap, thereby improving a reflectance and a transmittance thereof.
    Type: Grant
    Filed: April 28, 2004
    Date of Patent: May 27, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Won-Sang Park, Kee-Han Uh, Yong-Kyu Jang, Sang-Woo Park, Sang-Woo Kim, Sung-Eun Cha, Jae-Young Lee, Jae-Hyun Kim
  • Publication number: 20080013018
    Abstract: A liquid crystal display panel includes a liquid crystal layer having a twist angle of ±10 degree. An upper polarizer is disposed over an upper substrate of the liquid crystal display panel, and includes an absorption axis forming at an angle of 47±10 degree in a clockwise direction with respect to a major axis. An upper ?/2 retardation film is disposed between the upper substrate and the upper polarizer, and includes ?nd1 of 260±10 nm and a slow axis forming at an angle of 166±10 degree in the clockwise direction with respect to the absorption axis. An upper ?/4 retardation film is disposed between the upper substrate and the upper ?/2 retardation film, and includes ?nd2 of 140±10 nm and a slow axis forming at an angle of 111±10 degree in the clockwise direction with respect to the absorption axis. Therefore, the optical condition of the optical film assembly is optimized to improve an image display quality.
    Type: Application
    Filed: September 21, 2007
    Publication date: January 17, 2008
    Applicant: SAMSUNG ELECTRONICS CO., LTD.,
    Inventors: Yong-Kyu JANG, Won-Sang PARK, Jae-Hyun KIM, Sang-Woo KIM, Sung-Eun CHA, Jae-Young LEE