11.4: OCB‐LCDs with New Driving Method Having Fast Response of 2.3‐ms MPRT and High Contrast Ratio of 1000:1

Nakao, Kenji; Tanaka, Yukio; Takahara, Hiroshi; Kawaguchi, Seiji; Nishiyama, Kazuhiro; Araki, Shigesumi; Takimoto, Akio

doi:10.1889/1.2785246

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…In our 3-D projection system, the high contrast ratio and wide viewing angle were expected to suppress cross-talk, regardless of the direction of incident light. We fabricated an optically compensated bend (OCB) mode [15][16][17][18][19][20] LC cell that had a wide viewing angle and a high contrast ratio for the space-dividing iris-plane LC shutter. We used an optical compensation film to obtain a wide viewing angle.…”

Section: Fabrication Of the Ocb-mode Iris-plane Lc Shutter And Evaluamentioning

confidence: 99%

High‐resolution autostereoscopic 3‐D projection display with a space‐dividing iris‐plane shutter

et al. 2010

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Abstract— A high‐resolution autostereoscopic 3‐D projection display with a polarization‐control space dividing the iris‐plane liquid‐crystal shutter is proposed. The polarization‐control iris‐plane shutter can control the direction of stereo images without reducing the image quality of the microdis‐play. This autostereoscopic 3‐D projection display is 2‐D/3‐D switchable and has a high resolution and high luminance. In addition, it has no cross‐talk between the left and right viewing zones, a simple structure, and the capability to show multi‐view images.

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Section: Fabrication Of the Ocb-mode Iris-plane Lc Shutter And Evaluamentioning

confidence: 99%

High‐resolution autostereoscopic 3‐D projection display with a space‐dividing iris‐plane shutter

et al. 2010

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“…Furthermore, we have proposed the third version of new driving method using a LED backlight (OCB-III) [8] [9]. OCB-III includes a technology that can simultaneously improve moving picture quality and contrast ratio.…”

Section: Conventional Ocbmentioning

confidence: 99%

64.1: High Contrast, Low MPRT OCB LCD with Dynamic Backlight Control Technology

Araki

Nakao

Kawaguchi

et al. 2008

Symp Digest of Tech Papers

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We have developed a high performance OCB-III LCDs with dynamic backlight control technology having a high contrast ratio of 1,000,000:1 and a MPRT of 2.0ms with the 32 inch panel. With OCB-III driving, which is suitable for dynamic backlight control, we have realized a high contrast ratio without sacrificing its fast response time. IntroductionRecently, the needs for TFT-LCDs have been dramatically increasing, especially for TV applications. LCDs have numerous advantages including high resolution, low power consumption, light weight, and slim size. However, conventional LCDs such as TN have mainly three big subjects: narrow viewing angle, slow response time and low contrast ratio.At present, the subject of narrow viewing angle has mostly improved by adopting new LCD modes such as IPS, VA and OCB [1]. But the subjects of slow response and low contrast ratio are unsolved. Many companies have proposed these improvement means to address these subjects. For example, high frame ratio, Over-drive, OCB-mode are used to improve slow response time. Among these techniques, dynamic backlight control technology dramatically improves contrast ratio [2]. In this paper, we propose a new dynamic backlight control technology for high speed OCB mode. Conventional LCDThe contrast ratio of conventional LCDs has been improved by dynamic backlight control technology. However, this technology needs a very complex algorithm to prevent a flashing problem caused by a sudden image change. Figure.1 shows a concept of the flashing problem on a conventional LCD. The first frame is dark image with a gray ball, the second and third frame suddenly appear a bright big ball. As the conventional LCD's driving takes one frame for data addressing, the image of the first frame remains at the beginning of the second frame and mixes with the second image in the middle of the second frame. If the backlight brightness is changed at the beginning of the second frame, the flashed small ball appears for a moment, which results in a flashing problem. To avoid this problem, the dynamic backlight control of usual conventional LCD delays the changing point of backlight brightness.Figure2 shows a concept of a conventional LCD adopting dynamic backlight control technology. This backlight control system solves the flashing problem because backlight brightness changes after completing the second frame image. However, the brightness of a big ball image changes stepwise. This means that the response speed become slow in this system. Furthermore, this system needs the complex algorithm for adjusting the backlight brightness to variations of each image.

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“…To obtain the wide viewing angle, the optical compensation film designed for OCB mode was used. A fast response time was achieved by introducing a new driving method [9]. For mobile applications, a one-chip driver for universal voltage supply was also used for the transition.…”

Section: Application To Tft-lcd For Mobile Applicationsmentioning

confidence: 99%

5.1: Analysis of the Anisotropy of Bend Transition for OCB LCD with Low Initialization Voltage

Kizu

Hasegawa

Kizaki

et al. 2008

Symp Digest of Tech Papers

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To improve the efficiency of bend transition in OCB, its anisotropy was analyzed. The transition antiparallel (opposite) to the rubbing direction was significantly fast and this anisotropy remained at low temperatures. We propose two effects of LC shear flow on the anisotropy. Based on a pixel design that takes the anisotropy into consideration, 40% reduction of the initialization voltage in a 3‐inch TFT‐LCD has been achieved.

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11.4: OCB‐LCDs with New Driving Method Having Fast Response of 2.3‐ms MPRT and High Contrast Ratio of 1000:1

Cited by 10 publications

References 6 publications

High‐resolution autostereoscopic 3‐D projection display with a space‐dividing iris‐plane shutter

High‐resolution autostereoscopic 3‐D projection display with a space‐dividing iris‐plane shutter

64.1: High Contrast, Low MPRT OCB LCD with Dynamic Backlight Control Technology

5.1: Analysis of the Anisotropy of Bend Transition for OCB LCD with Low Initialization Voltage

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