映像情報メディア学会誌
Online ISSN : 1881-6908
Print ISSN : 1342-6907
ISSN-L : 1342-6907
60 巻, 9 号
選択された号の論文の28件中1~28を表示しています
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  • Keitaro Yamashita, Toshiya Inada, Steven Deane, Paul Collins, Satoshi ...
    2006 年 60 巻 9 号 p. 1405-1409
    発行日: 2006/09/01
    公開日: 2008/03/07
    ジャーナル フリー
    We have developed two 1.8" QVGA (222dpi) transflective a-Si AMLCDs with integrated gate drivers. One is optimized for a very low power normal operating mode. The other can switch to an arbitrary partial scan mode. Gate driver integration results in narrow, symmetric margins, reduced cost, and fewer interconnections. Also, we minimized the number of connections to the display while retaining some to achieve very significant power reduction.
  • 久武 雄三, 小尾 正樹, 伊藤 秀樹, 竹林 希佐子, 多胡 千種, 川田 靖, 村山 昭夫
    2006 年 60 巻 9 号 p. 1410-1415
    発行日: 2006/09/01
    公開日: 2008/03/07
    ジャーナル フリー
    The patience limit (PL) and just noticeable difference (JND) of various grayscale viewing angle characteristics were evaluated subjectively using simulated images. Ten test subjects evaluated four types of picture images. Each type consisted of eight different images; two kinds of reverse images, three kinds of black crushing images, and three kinds of white omission images. All the images had several grayscale difference levels. The results showed that the concernments depend not only on the kind of pictures but also significantly on the images. We propose a new evaluation criterion, criterion grayscale difference odiousness (CGDO) value, for evaluating grayscale viewing angle characteristics. The value is calculated integrating the gamma-curve shape and the difference in the grayscale level from the original one. In our results, the CGDO values at PL and JND are about 2.0 and 0.5, respectively. Therefore the CGDO values shall be 2.0 or less, and should be 0.5 or less for ideal TFT-LCD legibility.
  • 船本 昭宏, 吉田 実里, 櫻井 顕治, 大平 真琴, 川端 康大, 青山 茂
    2006 年 60 巻 9 号 p. 1416-1420
    発行日: 2006/09/01
    公開日: 2008/03/07
    ジャーナル フリー
    Recently, due to need of the mobile phones to be more portable, there is strong expectation of backlight system for that application to be thinner and lighter along with the need to be brighter. To achieve this, we developed a sheetless backlight system that does not require the optical sheets that are usually required. Conventional backlight systems require a diffusive sheet and prism sheets to improve the uniformity and brightness respectively of the light emitted from the lightguide. The functions of these sheets were integrated onto a lightguide and the number of backlight components was reduced by 50%. We describe the method used to integrate the diffusive sheets' functions with the design of the prisms' random arrangement using prism size control.
  • 和田 恭典, 友安 裕之, 石原 智成, 森本 泰治
    2006 年 60 巻 9 号 p. 1421-1427
    発行日: 2006/09/01
    公開日: 2008/03/07
    ジャーナル フリー
    To achieve excellent picture quality at low cost using electron guns in large-screen color TV tubes, an improved E4 main lens has been developed by generating a negative astigmatism at the entrance of the main lens while maintaining a strong positive astigmatism at the exit of the main lens. Enlarging the main lens diameter by 67% in the horizontal direction improved the focus performance of the guns even though a cheaper oxide cathode was used instead of an expensive impregnated cathode in a large-screen color TV tube (in which a high luminance is required). And the guns of both dynamic focus and non-dynamic (or static) focus types use the same design for each electrode, except for G3, which helps further cost reduction of the electron guns.
  • 藤崎 好英, 新井 俊希, 大竹 浩, 丸山 裕孝, 井上 陽司, 藤掛 英夫, 時任 静士, 栗田 泰市郎
    2006 年 60 巻 9 号 p. 1428-1434
    発行日: 2006/09/01
    公開日: 2008/03/07
    ジャーナル フリー
    We developed an organic thin-film transistor (OTFT) -driven 16×16 polymer-dispersed liquid crystal (PDLC) display panel on a flexible plastic film. We fabricated low-voltage-operation bottom-contact (BC) OTFT with Ta2O5 gate insulator, using photolithography method. This transistor is suitable for both scaling down and increasing the number of pixels, however its performance is inferior to that of top-contact OTFT because of contamination and defects on the surface of the insulator, and leakage-current of channel region. We have reduced the current of the OTFT by optimizing the pentacene deposition area. We used O2 plasma, UV cleaning and HMDS as surface treatments suitable for Ta2O5 gate insulator, to improve the characteristics. The OTFT showed a good carrier mobility of 0.3 cm2/Vs, a high current on/off ratio of over 106 and a low operating drain voltage of -6V. We also successively confirmed display operation of the fabricated 16×16 PDLC display panel with a low driving voltage of 13 volts.
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