Cholesteric Reflector Patents (Class 349/115)
  • Patent number: 8018555
    Abstract: A backlight device for a liquid crystal display device includes a light source providing light; a light waveguide plate 40 guiding light from the light source, having an emitting surface, a front surface and a bottom surface, the emitting surface adjacent to the light source; a reflector arranged under the bottom surface of the light wave guide plate, reflecting light; and at least one cholesteric liquid crystal (CLC) film arranged over the front surface of the light wave guide plate, collimating light.
    Type: Grant
    Filed: April 9, 2010
    Date of Patent: September 13, 2011
    Assignee: LG Display Co., Ltd.
    Inventors: Hyeon-ho Son, Jong-weon Moon
  • Patent number: 8013963
    Abstract: A color filter is described, including a first color filter layer, a first light absorbing layer, a second color filter pattern and a second light absorbing pattern. The first color filter layer is disposed over a substrate. The first light absorbing layer is disposed between the substrate and the first color filter layer. The second color filter pattern covers a portion of the first color filter layer. The second light absorbing pattern is disposed between the second color filter pattern and the first color filter layer.
    Type: Grant
    Filed: April 11, 2008
    Date of Patent: September 6, 2011
    Assignee: Himax Display, Inc.
    Inventors: Pei-Wen Ko, Ta-Shuang Kuan, Chin-Hsia Chen
  • Patent number: 8008662
    Abstract: A display substrate having a low-resistance metallic layer and a method of manufacturing the display substrate. The gate conductors are extended in a first direction. The source conductors are extended in a second direction crossing the first direction including a lower layer of molybdenum or a molybdenum alloy, and an upper layer of aluminum or an aluminum alloy. The pixel areas are defined by the gate conductors and the source conductors. A switching element is formed in each of the pixel areas and includes a gate electrode extended from the gate conductor and a source electrode extended from the source conductor. The pixel electrode includes a transparent conductive material, and is electrically connected to a drain electrode of the switching element.
    Type: Grant
    Filed: November 25, 2009
    Date of Patent: August 30, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Joo-Han Kim, Min-Seok Oh, Jun-Young Lee, Sung-Wook Kang
  • Publication number: 20110187973
    Abstract: A heat shield comprising a first light-reflective layer, having a reflectance peak both in a wavelength range of from 400 nm to less than 850 nm and in a wavelength range of from more than 850 nm to 1300 nm and satisfying C>A>B, is disclosed. “A” means the maximum reflectance in the wavelength range of from 400 nm to less than 850 nm; “B” means the reflectance at a wavelength of 850 nm; “C” means the maximum reflectance in the wavelength range of from more than 850 nm to 1300 nm; and “B” is equal to or less than 50%.
    Type: Application
    Filed: February 1, 2011
    Publication date: August 4, 2011
    Applicant: FUJIFILM Corporation
    Inventors: Kazuhiro OKI, Wataru Majima, Mitsuyoshi Ichihashi, Yuichi Shirasaki
  • Publication number: 20110181820
    Abstract: Disclosed is an infrared light reflecting plate for reflecting infrared light, which comprises a substrate and at least four light-reflective layers X1, X2, X3 and X4 each of which is formed of a fixed cholesteric liquid-crystal phase. The reflection center wavelength of the light-reflective layers X1 and X2 is the same and is ?1 (nm), the two layers reflect circularly-polarized light in opposite directions, and the reflection center wavelength ?1 (nm) falls within a range of from 1010 to 1070 nm, and the reflection center wavelength of the light-reflective layers X3 and X4 is the same and is ?2 (nm), the two layers reflect circularly-polarized light in opposite directions, and the reflection center wavelength ?2 (nm) falls within a range of from 1190 to 1290 nm.
    Type: Application
    Filed: January 26, 2011
    Publication date: July 28, 2011
    Inventor: Hidetoshi WATANABE
  • Publication number: 20110181803
    Abstract: An LCD device includes a transparent substrate. A first data electrode, a first CLC-MC layer, a first selection electrode, a second CLC-MC layer, a second data electrode, an insulating layer, a second selection electrode, a third CLC-MC layer, and a third data electrode are sequentially formed in this order on the transparent substrate.
    Type: Application
    Filed: January 7, 2009
    Publication date: July 28, 2011
    Inventor: Ippei Inoh
  • Patent number: 7959296
    Abstract: A multiple path stereoscopic projection system is disclosed. The system comprises a polarizing splitting element configured to receive image light energy and split the image light energy received into a primary path and a secondary path, a reflector in the secondary path, and a polarization modulator or polarization modulator arrangement positioned in the primary path and configured to modulate the primary path of light energy. A polarization modulator may be included within the secondary path, a retarder may be used, and optional devices that may be successfully employed in the system include elements to substantially optically superimpose light energy transmission between paths and cleanup polarizers. The projection system can enhance the brightness of stereoscopic images perceived by a viewer. Static polarizer dual projection implementations free of polarization modulators are also provided.
    Type: Grant
    Filed: December 27, 2010
    Date of Patent: June 14, 2011
    Assignee: RealD Inc.
    Inventors: Matt Cowan, Lenny Lipton, Jerry Carollo
  • Publication number: 20110116026
    Abstract: A liquid crystal display includes a first base substrate, a second base substrate facing the first base substrate, a liquid crystal layer disposed between the first substrate and the second substrate, a non-transmissive layer on the first base substrate to absorb light, a plurality of color filter layers arranged on the non-transmissive layer and including a cholesteric liquid crystal to change a wavelength of light and reflect the light, an alignment layer arranged between the non-transmissive layer and the color filter layers to align the cholesteric liquid crystal, a first electrode on the color filter layers, and a second electrode on the second base substrate.
    Type: Application
    Filed: May 6, 2010
    Publication date: May 19, 2011
    Inventors: Jong Seong Kim, Sangil Kim, WooJae Lee, Min ho Yoon
  • Publication number: 20110069262
    Abstract: A liquid crystal display according to exemplary embodiments of the present invention includes a first panel including a first lower substrate, a first lower electrode formed on the first lower substrate, a first upper substrate facing the first lower substrate, a first upper electrode formed on the first upper substrate, and a first cholesteric liquid crystal injected between the first lower electrode and the first upper electrode, wherein the first lower electrode includes carbon nanotubes. The liquid crystal display including the first lower electrode made of the carbon nanotubes without a light absorption layer provides a simple structure capable of realizing a black state.
    Type: Application
    Filed: April 26, 2010
    Publication date: March 24, 2011
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Jong-Seong KIM, Nam-Seok Roh, Sang-II Kim, Woo-Jae Lee
  • Patent number: 7898625
    Abstract: A liquid crystal device including a pair of electrodes provided with a vertical alignment film and a liquid crystal layer disposed between the pair of electrodes and including a liquid crystal composition containing a liquid crystal with positive dielectric anisotropy, a dichroic dye and a chiral reagent, with a ratio (P/G) of a chiral pitch length (P) of the liquid crystal composition to a gap (G) between the pair of electrodes being from 0.06 to less than 1.0.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: March 1, 2011
    Assignee: Fujifilm Corporation
    Inventors: Naoyuki Hayashi, Takashi Kato, Koji Takaku, Katsuyuki Yofu
  • Patent number: 7898615
    Abstract: An exemplary backlight module includes a light source and a light guide plate. The light guide plate includes a light incident surface positioned for receiving light beams from the light source, a bottom surface adjacent to the light incident surface, reflective structures provided on the bottom surface, and a light emitting surface configured for emission of the light beams. Each of the reflective structures partially overlaps corresponding adjacent reflective structures at one side, and is partially overlapped by corresponding adjacent reflective structures at an opposite side. A liquid crystal display including the backlight module is also provided.
    Type: Grant
    Filed: December 29, 2007
    Date of Patent: March 1, 2011
    Assignee: Chimel Innolux Corporation
    Inventors: Chih-Chung Hsiao, Kuo-Chih Huang
  • Patent number: 7880837
    Abstract: A cholesteric display may be formed, in some embodiments, using a single display element to produce multi-colors for display. A cholesteric material may be sandwiched between a pair of substrates, each associated with pairs of opposed electrodes that are arranged in general transversely to the optical axis of incident light. The first pair of electrodes produce one of two liquid crystal states and result in the reflection of light of a particular wavelength. Light of other wavelengths may be reflected when a second pair (or set) of opposed electrodes, arranged in general transversely, also to the optical axis of incident light, are biased appropriately. So does a third pair (or set) of electrodes. A black and white color display may be generated from a single display element by modulating the pitch length of the cholesteric material within each pairs (or sets).
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: February 1, 2011
    Assignee: Intel Corporation
    Inventors: David B. Chung, Daniel J. Lenehan
  • Patent number: 7872709
    Abstract: An LCD device includes lower and upper substrates facing each other, a liquid crystal layer between the lower and upper substrates, a first polarizing plate on the upper substrate, a second polarizing plate below the lower substrate, and a backlight unit below the second polarizing plate. The second polarizing plate has a light-diffusion layer that is proximate to the backlight unit. The light-diffusion layer has projections that project towards and contact the backlight unit. These projections are smooth curves that do not damage the surface of the backlight unit. The total of the Haze formed by the first and second polarizing plates is at least 40%.
    Type: Grant
    Filed: December 8, 2008
    Date of Patent: January 18, 2011
    Assignee: LG Display Co., Ltd.
    Inventors: June Ho Park, Sai Chang Yun
  • Patent number: 7857455
    Abstract: A multiple path stereoscopic projection system is disclosed. The system comprises a polarizing splitting element configured to receive image light energy and split the image light energy received into a primary path and a secondary path, a reflector in the secondary path, and a polarization modulator or polarization modulator arrangement positioned in the primary path and configured to modulate the primary path of light energy. A polarization modulator may be included within the secondary path, a retarder may be used, and optional devices that may be successfully employed in the system include elements to substantially optically superimpose light energy transmission between paths and cleanup polarizers. The projection system can enhance the brightness of stereoscopic images perceived by a viewer. Static polarizer dual projection implementations free of polarization modulators are also provided.
    Type: Grant
    Filed: October 18, 2006
    Date of Patent: December 28, 2010
    Assignee: RealD Inc.
    Inventors: Matt Cowan, Lenny Lipton, Jerry Carollo
  • Patent number: 7852439
    Abstract: The invention relates to a multi-layer display element configured by a plurality of layers for use as a display section of electronic paper or others, and a manufacturing method for the multi-layer display element. The invention provides a multi-layer display element that allows a pixel area not being narrowed, a high yield of electrode formation, and interlayer connection with no need for a high-temperature process, and a manufacturing method for such a multi-layer display element. The multi-layer liquid crystal display element includes a data signal output terminal group from which data signals are provided, a scanning signal output terminal group from which scanning signals are provided, a data electrode connection wire rod group respectively connecting data electrodes to the data signal output terminal group, and a scanning electrode connection wire rod group respectively connecting scanning electrodes to the scanning signal output terminal group.
    Type: Grant
    Filed: September 17, 2009
    Date of Patent: December 14, 2010
    Assignee: Fujitsu Limited
    Inventors: Hisashi Yamaguchi, Fumio Yamagishi, Shigeo Matsunuma, Nobuhiro Imaizumi, Yoshikatsu Ishizuki, Taiji Sakai, Junji Tomita
  • Publication number: 20100302486
    Abstract: A discrimination medium, which can have much information, can be produced on a small scale at low cost, and enables change of a sticker design at low cost, is provided. A cholesteric liquid crystal layer, having a fine asperity for forming a hologram, is formed on a transparent first substrate. A print layer composed of a black ink is formed on a transparent second substrate. The substrates are affixed to each other via a bond layer, so that a discrimination medium is obtained. In the discrimination medium, the display content obtained by the print layer is changed, so that the display content for discrimination can be changed at low cost.
    Type: Application
    Filed: November 14, 2008
    Publication date: December 2, 2010
    Applicant: NHK SPRING CO., LTD.
    Inventors: Hidekazu Hoshino, Tokio Sakauchi, Mutsumi Sasaki, Tohru Ida, Naomi Iida
  • Patent number: 7843535
    Abstract: The present invention provides a reflective liquid crystal display assembly, which includes a first substrate, a second substrate and a liquid crystal layer sealed between them. The present invention designs a specific surface structure of at least one of the first and second substrates relative to the liquid crystal layer so that the helical axes of the cholesteric liquid crystal molecules can incline in different directions as desired in the liquid crystal layer. The reflective spectrum can be broadened and the viewing angle is widened.
    Type: Grant
    Filed: February 27, 2006
    Date of Patent: November 30, 2010
    Assignee: Industrial Technology Research Institute
    Inventors: Chi Lun Ting, Tsung Hsien Lin, Chi Chang Liao, Shie Chang Jeng, Yan Rung Lin, Ying Guey Fuh
  • Patent number: 7830479
    Abstract: The liquid crystal display includes a first display unit, a second display unit, a light absorbing layer disposed on a bottom surface of the first display unit so as to absorb light which has entered the first display unit through a top surface thereof and which has been transmitted by the first liquid crystal, and a control circuit section for effecting a switch between a two-surface display mode in which the second display unit is lapped over the first display unit so as to face the bottom surface thereof with the light absorbing layer interposed between them to display images independent of each other on the first display unit and the second display unit and a high image quality mode in which the second display unit is lapped over the first display unit so as to face the top surface thereof to display the same image on the first and second display units.
    Type: Grant
    Filed: September 1, 2009
    Date of Patent: November 9, 2010
    Assignee: Fujitsu Limited
    Inventor: Masaki Nose
  • Patent number: 7821599
    Abstract: A liquid crystal display element is disclosed for displaying an image. The liquid crystal display element comprises a liquid crystal display layer in which voltages are applied to a transmissive display unit and a reflective display unit, defined in one pixel, independently of each other, and a light source for irradiating the liquid crystal display layer with light from the back, and a reflection control element disposed between the liquid crystal display layer and light source. The liquid crystal display element is switched between a reflective state and a transmissive state in accordance with a voltage applied to the reflection control element. The liquid crystal display element is switched among a transmissive display mode, a combined reflective/transmissive display mode, and a reflective display mode, by utilizing the transmissive display unit and reflective display unit to display an image independently of each other.
    Type: Grant
    Filed: July 10, 2007
    Date of Patent: October 26, 2010
    Assignee: NEC LCD Technologies, Ltd
    Inventors: Koji Mimura, Ken Sumiyoshi, Jin Matsushima
  • Patent number: 7808587
    Abstract: A light-shielding plate and a first light-shielding layer are arranged between a polarizing plate and a liquid crystal layer in a peripheral region of a liquid crystal panel so that linearly polarized light transmitted through the polarizing plate, which is a reflection polarizing plate, is not incident on the liquid crystal layer, but is reflected to the polarizing plate in the peripheral region.
    Type: Grant
    Filed: September 4, 2008
    Date of Patent: October 5, 2010
    Assignee: Sony Corporation
    Inventors: Yasuhiro Shirasaka, Kohichi Ohmura, Hisashi Kadota, Akiko Toriyama, Tsuyoshi Okazaki
  • Patent number: 7808582
    Abstract: An illuminating apparatus providing polarized color light and a display apparatus including the illuminating apparatus are provided. The illuminating apparatus includes a light source; a polarization light guide plate (LGP) unit which converts a polarization direction of light emitted from the light source into linearly polarized light, and collimates the linearly polarized light; and a cholesteric liquid crystal color filter which disposed on an upper portion of the polarization LGP unit, and selectively reflects light according to a polarized status and a wavelength of the light.
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: October 5, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Seong-mo Hwang, Jae-ho You
  • Patent number: 7787080
    Abstract: A projection system includes a projector that emits imaging light, a polarization screen that selectively reflects, of the imaging light, only light in a specified state of polarization, and a reflecting element placed on an optical path between the projector and the polarization screen to reflect the imaging light. The projector emits imaging light containing circularly polarized light whose state of polarization varies according to the wave range of the light, and the first and the second reflective layers in the reflecting element have polarization characteristics and reflection wave ranges corresponding to the state of polarization and the wave range of the circularly polarized light contained in the imaging light in such a manner that the state of polarization of the circularly polarized light, after being reflected from the first and the second reflective layers, is uniform irrespective of the wave range of the light.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: August 31, 2010
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventor: Masanori Umeya
  • Patent number: 7760296
    Abstract: The present invention provides for improved contrast in the transmissive mode of a transflective liquid crystal display having a rear stack polarizing means (302) which is transmissive for light having a desired polarization and reflective for light having an opposite, undesired polarization. The contrast is improved due to enhancements of the black state provided by the inclusion of a reflection preventing means (306). The reflection preventing means is arranged between the transflector (301) and the rear stack polarizer (302), and serves to stop light transmitted through the rear stack polarizer (302) towards the transflector (301) from being reflected by the transflector (301) back to the rear polarizer (302). Thereby undesired reflections having wrong polarization are stopped from being transmitted through the transflector (301) and thus from affecting the transmissive mode black state of the display.
    Type: Grant
    Filed: September 3, 2004
    Date of Patent: July 20, 2010
    Assignee: TPO Hong Kong Holding Limited
    Inventors: Nicole Alide Christianne Maria Gotink-Meinders, Rudolf Jozef Marie Beeren
  • Publication number: 20100157215
    Abstract: The invention relates to a liquid crystal display element having a liquid crystal enclosed between a pair of substrates and a multi-layer liquid crystal display element utilizing such elements. A liquid crystal display element having improved strength at enclosing portions thereof is provided without any reduction in the throughput of manufacturing steps along with a multi-layer liquid crystal display element utilizing such elements.
    Type: Application
    Filed: March 4, 2010
    Publication date: June 24, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Yoshihisa Kurosaki, Junji Tomita
  • Patent number: 7742136
    Abstract: A sheet with anti-counterfeit functions for making counterfeiting highly difficult in the case where authentication information is recorded using the properties of cholesteric liquid crystal is provided. A cholesteric liquid crystal layer 110 having a selective reflected wavelength band in at least the visible light region is provided in such a manner that this cholesteric liquid crystal layer 110 is a single layer of which thickness is approximately uniform, and an authentication region 112 of which selective reflected wavelength band is different is provided in at least one place. Preferably, an adhesive layer 130 is provided on one side of the cholesteric liquid crystal layer 110. Preferably, a base 120 is provided between the cholesteric liquid crystal layer 110 and the adhesive layer 130. Preferably, a light absorbing layer 140 is provided on adhesive layer 130 of the cholesteric liquid crystal layer 110.
    Type: Grant
    Filed: November 17, 2005
    Date of Patent: June 22, 2010
    Assignee: Nitto Denko Corporation
    Inventors: Seiji Umemoto, Miki Shiraogawa, Takahiro Fukuoka, Naoki Takahashi, Kentarou Takeda
  • Patent number: 7733447
    Abstract: A liquid crystal display device in which three cholesteric liquid crystal layers of selective reflection type are laminated, comprises: a first liquid crystal layer arranged on a device observation side selectively reflecting blue; a second liquid crystal layer arranged next to the first liquid crystal layer selectively reflecting green; a third liquid crystal layer arranged next to the second liquid crystal layer selectively reflecting red; and a green cut filter layer arranged between the green liquid crystal layer and the red liquid crystal layer selectively absorbing a light ray of a wavelength of 600 nm or less.
    Type: Grant
    Filed: January 3, 2008
    Date of Patent: June 8, 2010
    Assignee: Fujitsu Limited
    Inventors: Junji Tomita, Masaki Nose, Tomohisa Shingai
  • Patent number: 7732809
    Abstract: The present invention provides light emitting displays which produce a bright image by efficiently emitting light radiated from a light-emitting thin-film layer to the viewer side, and also produces a high-quality image of high contrast ratio and changing in color to a limited extent over a wide viewing angle range even in a bright atmosphere.
    Type: Grant
    Filed: August 10, 2004
    Date of Patent: June 8, 2010
    Assignee: Hitachi Displays, Ltd.
    Inventors: Masaya Adachi, Osamu Itou
  • Patent number: 7733443
    Abstract: A liquid crystal display with a backlight is described. The liquid crystal cell comprising a front panel and a rear panel with polarizing means on each panel, and the front polarizing means includes a reflective polarizer and a dichroic polarizer.
    Type: Grant
    Filed: October 1, 2004
    Date of Patent: June 8, 2010
    Assignee: Nitto Denko Corporation
    Inventors: Pavel I. Lazarev, Michael V. Paukshto
  • Patent number: 7719642
    Abstract: A backlight device for a liquid crystal display device includes a light source providing light; a light waveguide plate 40 guiding light from the light source, having an emitting surface, a front surface and a bottom surface, the emitting surface adjacent to the light source; a reflector arranged under the bottom surface of the light wave guide plate, reflecting light; and at least one cholesteric liquid crystal (CLC) film arranged over the front surface of the light wave guide plate, collimating light.
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: May 18, 2010
    Assignee: LG Display Co., Ltd.
    Inventors: Hyeon-ho Son, Jong-weon Moon
  • Patent number: 7710522
    Abstract: A liquid crystal device comprises a cholesteric liquid crystal material interposed between a transparent front plate and a back plate. The cholesteric liquid crystal material is switchable between a transparent state and a reflective state in response to an electric field applied in a first direction. In the reflective state the material reflects light characterized by a first wavelength when no electric field is applied. Electrodes are provided for applying an electric field lied to the cholesteric liquid crystal material in the reflective state in a second direction distinct from the first direction. In this manner the cholesteric liquid crystal material is altered to cause the material to reflect light characterized by a second wavelength different from the first wavelength. A display device may thus be produced having pixels capable of a wide range of colors, thereby achieving a multicolored image for the display.
    Type: Grant
    Filed: September 23, 2000
    Date of Patent: May 4, 2010
    Assignee: Motorola, Inc.
    Inventors: Zili Li, Jon Schindler, Robert Akins, George Valliath
  • Publication number: 20100103337
    Abstract: The liquid crystal composition of the invention exhibits selective reflection and changes its selective reflection wavelength by a redox reaction induced by an electric field. The liquid crystal device of the invention has a pair of electrodes, at least one of which is a transparent electrode, and a liquid crystal layer containing the liquid crystal composition between the electrodes. The reflective display material and the light modulating material of the invention include the liquid crystal device described above.
    Type: Application
    Filed: October 27, 2009
    Publication date: April 29, 2010
    Inventor: Koji TAKAKU
  • Publication number: 20100097550
    Abstract: The invention relates to a multi-layer display element configured by a plurality of layers for use as a display section of electronic paper or others, and a manufacturing method for the multi-layer display element. The invention provides a multi-layer display element that allows a pixel area not being narrowed, a high yield of electrode formation, and interlayer connection with no need for a high-temperature process, and a manufacturing method for such a multi-layer display element. The multi-layer liquid crystal display element includes a data signal output terminal group from which data signals are provided, a scanning signal output terminal group from which scanning signals are provided, a data electrode connection wire rod group respectively connecting data electrodes to the data signal output terminal group, and a scanning electrode connection wire rod group respectively connecting scanning electrodes to the scanning signal output terminal group.
    Type: Application
    Filed: September 17, 2009
    Publication date: April 22, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Hisashi Yamaguchi, Fumio Yamagishi, Shigeo Matsunuma, Nobuhiro Imaizumi, Yoshikatsu Ishizuki, Taiji Sakai, Junji Tomita
  • Publication number: 20100097551
    Abstract: A multilayer liquid crystal display element has a plurality of data electrode layer-to-layer interconnects formed in a non-display area of a liquid crystal display panel for connecting data electrodes of liquid crystal display panels for R, G, and B to a plurality of data signal input terminals from layer to layer, and a plurality of scanning electrode layer-to-layer interconnects formed in the non-display area for connecting scanning electrodes of the liquid crystal display panels for R, G, and B to a plurality of scan signal input terminals from layer to layer.
    Type: Application
    Filed: September 17, 2009
    Publication date: April 22, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Fumio Yamagishi, Junji Tomita, Hisashi Yamaguchi
  • Publication number: 20100097549
    Abstract: Disclosed is reflective morphable display with multi-layered depth viewing, low power consumption and few components and a method of activating various features thereof. The disclosed display includes a bi-stable reflective cholesteric liquid display crystal (ChLCD) layered in combination with a display device such as an LCD and a quarter lambda (?/4) retardation film layer. Linearly polarized light emerging from the front surface of a display device is circularly polarized by the ?/4 layer before entering the ChLCD layer. In its reflective state, the ChLCD layer receiving a portion of the ambient light having the same handedness of the ChLCD is reflected in a mirror-like manner. Also in its reflective state, when it receives light that is circularly polarized by the ?/4 retardation film layer, the ChLCD layer acts as a shutter. A display device with depth viewing is provided as the ChLCD layer pixelated so it is configured to display font and/or other indicia.
    Type: Application
    Filed: October 20, 2008
    Publication date: April 22, 2010
    Applicant: MOTOROLA, INC.
    Inventors: Tomohiro Ishikawa, Andrew N. Cady, Robert D. Polak, Kenneth Dean
  • Patent number: 7701537
    Abstract: An optical diode. A cholesteric liquid crystal (CLC) layer has a selective reflection wavelength band with a left-handed helical structure, and a phase shifter for changing a phase difference between two intrinsic polarized light components of left-handed circularly polarized light having a wavelength within the selective reflection wavelength band of the CLC layer. When left-handed circularly polarized light having a wavelength within the selective reflection wavelength band of the CLC layer is incident on the phase shifter in the optical diode, the phase shifter turns the left-handed circularly polarized light into right-handed circularly polarized light, which can be transmitted through the CLC layer. When left-handed circularly polarized light having a wavelength within the selective reflection wavelength band of the CLC layer is incident on the CLC layer, it is selectively reflected by the CLC layer.
    Type: Grant
    Filed: March 2, 2007
    Date of Patent: April 20, 2010
    Assignees: Tokyo Institute of Technology, Nippon Oil Corporation
    Inventors: Hideo Takezoe, Byoungchoo Park, Myoung Hoon Song, Jisoo Hwang, Takehiro Toyooka, Suzushi Nishimura
  • Patent number: 7697088
    Abstract: An optical element covering member capable of improving insufficiency in rigidity of the optical element while an increase in thickness of a liquid crystal display device or deterioration of display characteristics of the liquid crystal display device is reduced, a backlight provided with the optical element covering member, and a liquid crystal display device are provided. The optical element covering member includes at least one optical element, a support medium for supporting the at least one optical element, and a covering member for covering the at least one optical element and the support medium. The at least one optical element and the support medium constitute a stack.
    Type: Grant
    Filed: February 7, 2008
    Date of Patent: April 13, 2010
    Assignee: Sony Corporation
    Inventors: Eiji Ohta, Toru Abiko, Yasuyuki Kudo, Hirokazu Odagiri, Satoshi Sato, Andrew Chakchung Yu, Masayasu Kakinuma, Fumiko Sasaki
  • Publication number: 20100026943
    Abstract: A device, such as a smart-card (301), has a front surface (2) and a display area (312). The display area (312) has an activated state and an inactivated state and is incorporated in the device (301) and has a display surface (3), which is surrounded by said front surface (2). The display area (312) has a light reflecting part (325) which, in the inactivated state of the display area (312), reflects incoming light. The light (RL) reflected by the reflecting part (325) provides the display surface (3) with a desired visual appearance in relation to the visual appearance of the front surface (2) surrounding the display surface (3).
    Type: Application
    Filed: October 27, 2005
    Publication date: February 4, 2010
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventors: Hendrik Jagt, Peter Slikkerveer
  • Publication number: 20100019666
    Abstract: An organic light emitting diode (OLED) display is disclosed. In one embodiment, the OLED display includes i) an OLED comprising i) a first electrode, ii) an organic emission layer formed on the first electrode, and iii) a second electrode formed on the organic emission layer, ii) a dual brightness enhancement film (DBEF) formed over the second electrode of the OLED, iii) a first polarizing plate formed on the DBEF, iv) a cholesteric liquid crystal (CLC) layer formed on the first polarizing plate, v) a phase delay plate that is a 1/4 wavelength plate formed on the CLC layer and vi) a second polarizing plate formed on the phase delay plate.
    Type: Application
    Filed: July 23, 2009
    Publication date: January 28, 2010
    Applicant: Samsung Mobile Display Co., Ltd.
    Inventors: Soon-Ryong Park, Hee-Seong Jeong, Eun-Ah Kim, Woo-Suk Jung, Hee-Chul Jeon, Noh-Min Kwak, Chul-Woo Jeong, Joo-Hwa Lee
  • Patent number: 7652736
    Abstract: An infrared light reflecting article is disclosed and includes a visible light transparent substrate including a polymer and an infrared light reflecting cholesteric liquid crystal layer disposed on the substrate. The substrate and infrared light reflecting cholesteric liquid crystal layer have a combined haze value of less than 3%.
    Type: Grant
    Filed: October 25, 2005
    Date of Patent: January 26, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: Raghunath Padiyath, Marc D. Radcliffe, Cristina U. Thomas, Charles A. Marttila, Manish Jain, Michael F. Weber, Feng Bai
  • Publication number: 20100002175
    Abstract: A display device includes; a first substrate, a second substrate disposed substantially opposite to the first substrate, a third substrate disposed between the first substrate and the second substrate, a color display layer disposed between the first substrate and the third substrate, the color display layer comprising a cholesteric liquid crystal, a first electrode and a second electrode electrically connected to the color display layer, a color conversion layer disposed between the third substrate and the second substrate, and a third electrode and a fourth electrode electrically connected to the color conversion layer.
    Type: Application
    Filed: March 19, 2009
    Publication date: January 7, 2010
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Sang-Il KIM, Nam-Seok ROH
  • Publication number: 20090316091
    Abstract: The liquid crystal display includes a first display unit, a second display unit, a light absorbing layer disposed on a bottom surface of the first display unit so as to absorb light which has entered the first display unit through a top surface thereof and which has been transmitted by the first liquid crystal, and a control circuit section for effecting a switch between a two-surface display mode in which the second display unit is lapped over the first display unit so as to face the bottom surface thereof with the light absorbing layer interposed between them to display images independent of each other on the first display unit and the second display unit and a high image quality mode in which the second display unit is lapped over the first display unit so as to face the top surface thereof to display the same image on the first and second display units.
    Type: Application
    Filed: September 1, 2009
    Publication date: December 24, 2009
    Applicant: FUJITSU LIMITED
    Inventor: Masaki Nose
  • Patent number: 7633678
    Abstract: An optical element of the invention comprises at least two laminated layers of reflective polarizer; and at least one retardation layer for changing polarization properties laminated between the reflective polarizers, the combination of the layers being designed so as to provide a incident-light transmittance depending on an incident angle of an incident light and designed such that a shielded light is not absorbed but reflected. The optical element can effectively shield transmitted lights with respect to obliquely incident lights and can control coloring.
    Type: Grant
    Filed: January 7, 2009
    Date of Patent: December 15, 2009
    Assignee: Nitto Denko Corporation
    Inventors: Naoki Takahashi, Kentarou Takeda, Kazutaka Hara, Miki Shiraogawa
  • Patent number: 7633581
    Abstract: A reflective colour display device comprising a display element including two opposed cell walls enclosing a layer of an electro-optic material, each cell wall being provided with at least one electrode on an inner surface thereof for applying an electric field across at least some of the electro-optic material, and a selective reflector on one of said cell walls, wherein the electro-optic material is electrically-switchable between a first state in which the display element will diffusely reflect substantially all wavelengths of visible light transmitted by the selective reflector, and a second state in which the display element will reflect light transmitted by the selective reflector at a substantially lower intensity than it does when the electro-optic material is in the first state.
    Type: Grant
    Filed: March 23, 2006
    Date of Patent: December 15, 2009
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: David Sikharulidze
  • Patent number: 7630037
    Abstract: A single light guide plate illuminates both first and second liquid crystal display panels opposed to each other, the second liquid crystal display panel having a larger display area than that of the first liquid crystal display panel. A light-absorbing sheet is provided between the light guide plate and the first liquid crystal display panel to absorb light from the light guide plate and has a light-transmitting part aligned with the first liquid crystal display panel in a direction from the light guide plate toward the first liquid crystal display panel to transmit light from the light guide plate to the first liquid crystal display panel. A reflective polarizing sheet is provided between the second liquid crystal display panel and the light guide plate.
    Type: Grant
    Filed: May 17, 2006
    Date of Patent: December 8, 2009
    Assignee: Citizen Electronics Co., Ltd.
    Inventor: Takashi Shimura
  • Patent number: 7630134
    Abstract: An optical element of the invention comprises at least two laminated layers of reflective polarizer; and at least one retardation layer for changing polarization properties laminated between the reflective polarizers, the combination of the layers being designed so as to provide a incident-light transmittance depending on an incident angle of an incident light and designed such that a shielded light is not absorbed but reflected. The optical element can effectively shield transmitted lights with respect to obliquely incident lights and can control coloring.
    Type: Grant
    Filed: January 7, 2009
    Date of Patent: December 8, 2009
    Assignee: Nitto Denko Corporation
    Inventors: Naoki Takahashi, Kentarou Takeda, Kazutaka Hara, Miki Shiraogawa
  • Publication number: 20090284691
    Abstract: The invention features electronic skin including an active layer formed of bistable cholesteric liquid crystal material and articles comprising the skin, the electronic skin having uniform gray scale reflectivity. Also featured is method for producing suitable reduction pulses that will provide a display (e.g., the electronic skin) with uniform gray scale reflectivity. Reduction pulses of narrow width are used to create uniform levels of gray in the electronic skin to overcome display imperfections that cause discontinuity in the gray scale reflectivity.
    Type: Application
    Filed: May 16, 2008
    Publication date: November 19, 2009
    Inventors: Duane W. Marhefka, Nithya Venkataraman, Sankar Barua
  • Patent number: 7616276
    Abstract: The present invention provides for improved brightness and reduced power consumption in transflective displays operating in transmissive mode. The invention is based on the inclusion of a depolarizing means (206) between the transflector (201) and the rear stack polarizer (202). The depolarizer (206) is arranged to selectively depolarize light originating from the backlight (203) and reflected by the transflector (201), without substantially affecting the light that is transmitted through the transflector. Thereby part of the reflected light is transmitted back through the rear stack polarizer (202) and can be recycled in the backlight (203). The invention is applicable to any transflective display having a transflector (201) that changes polarization of light originating from the backlight (203) upon reflection back towards the backlight (202).
    Type: Grant
    Filed: September 15, 2004
    Date of Patent: November 10, 2009
    Assignee: TPO Hong Kong Holding Limited
    Inventors: Martinus Petrus Creusen, Frans Leenhouts, Hendrik Christiaan Maria Hermens
  • Publication number: 20090244452
    Abstract: The invention relates to a liquid crystal display element for displaying images by driving a liquid crystal material, in particular, a liquid crystal composition exhibiting a cholesteric phase and relates to electronic paper utilizing the element. The invention provides a liquid crystal display element having improved display quality achieved by suppressing image sticking and electronic paper utilizing the element. The liquid crystal display element includes a pair of substrate disposed opposite to each other and a liquid crystal layer enclosed between the pair of substrates. Interfaces of the pair of substrates in contact with the liquid crystal layer are formed to have surface roughness of 1.5 nm or less or, more preferably, 0.8 nm or less.
    Type: Application
    Filed: June 9, 2009
    Publication date: October 1, 2009
    Applicant: FUJITSU LIMITED
    Inventors: Toshiaki Yoshihara, Makoto Fukuda, Yoshihisa Kurosaki
  • Patent number: 7595851
    Abstract: A liquid crystal display (LCD) is disclosed including a first cholesteric liquid crystal (LC) layer between a first and second substrate containing a plurality of adjacent alternately arranged pixels of a first and second primary color. A second cholesteric LC layer between the second substrate and a third substrate contains a plurality of adjacent alternately arranged pixels of the first and a third primary color. The first primary color pixels in the first and second LC layer, and the second primary color pixels in the first LC layer and the primary color pixels of the third primary color in the second LC layer, are arranged behind one another. Two first primary color pixels in the first and second LC layer interact with an adjacent second primary color pixel in the first LC layer and an adjacent third primary color pixel in the second LC layer for representing a display pixel.
    Type: Grant
    Filed: April 13, 2007
    Date of Patent: September 29, 2009
    Assignee: Aeg Gesellschaft für Moderne Informationssysteme mbH
    Inventors: Reiner Bayrle, Thomas Bitter, Otto Bader
  • Patent number: 7593073
    Abstract: An optical member includes a first liquid crystal assembly and a second liquid crystal assembly. The first liquid crystal assembly has a liquid crystal layer aligned in a first direction. Light polarized in the first direction is reflected from the first liquid crystal assembly. The second liquid crystal assembly is positioned on the first liquid crystal assembly. The second liquid crystal assembly has a liquid crystal layer aligned in a second direction that is opposite to the first direction. Light polarized in the second direction is reflected from the second liquid crystal assembly. Therefore, an image display quality is improved.
    Type: Grant
    Filed: September 7, 2005
    Date of Patent: September 22, 2009
    Assignee: Samsung Electronics Co. Ltd.
    Inventors: In-Sun Hwang, Sang-Yu Lee, Hae-Il Park, Jin-Seob Byun, Hyoung-Joo Kim