CRTディスプレイの表示文字と外部反射映像の見え方の主観評価

• 田渕 義彦

  松下電工 (株) 中央エンジニアリングセンター

• 中村 肇

  松下電工 (株) 中央エンジニアリングセンター

• 松島 公嗣

  松下電工 (株) 中央エンジニアリングセンター

書誌事項

タイトル別名

• The Subjective Appraisal of the Preferable Luminance of the Characters and the Permissible Reflected Luminance on the CRT Display Screen
• CRT ディスプレイ ノ ヒョウジ モジ ト ガイブ ハンシャ エイゾウ ノ

抄録

With spread of office automation system, Visual Display Terminal (VDT) became offen and usually used in office works. CRT (Cathode Ray Tube) displays are most usual unit of VDT. For most common positive contrast type display, wherethe character luminance is higher than the background luminance, lighting conditions on the display screen bring essential influence on visibility of the characters on the screen.<BR>Especially in these conditions, reflection of external light sources on the display screen has very important influence on the visibility of the characters.<BR>Experimental study using subjective appraisal was carried out to find out permissible range of reflected luminance related to the charactor luminance and the backgroud luminance.<BR>The results are as follows:<BR>(1) Preferable luminance of the charactor L_c' related to the background luminance L_b', which is proportional to the normal or vertical illuminance on the screen, is expressed with the empirical formula<BR>L_c'=16×L_b'^0.71<BR>(2) Under above condition, permissible value of the refrlected luminance Lr' is expressed with the empirical formula<BR>L_r'≅1.9L_b'^0.19<BR>or with the contrast form (luminance ratio)<BR>C=L_r'/L_b'≅1.9×L_b'^-0.09<BR>(3) Furthermore, for the practical range of the L_b', this contrast (Lr'/L_b') nearly constant and about 1. 2, for the display used in the experiment. To avoid reflected luminance, Lr' should be kept under 1. 2×L_b'.<BR>Where every L_c', L_b' and Lr' is total luminance overlapped with reflected component of the diffuse reflection on the screen.

収録刊行物

• 照明学会誌

  照明学会誌 71 (2), 131-137, 1987

  一般社団法人 照明学会

キーワード

• Electrical and Electronic Engineering

詳細情報

• CRID: 1390001204084335488
• NII論文ID: 130006764130
• NII論文ID: 40004319816
• NII書誌ID: AN00268860
• DOI: 10.2150/jieij1980.71.2_131
• ISSN: 1349838X
• ISSN: 21851506
• ISSN: 00192341
• NDL書誌ID: 3117580
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3117580
• Web Site: https://www.jstage.jst.go.jp/article/jieij1980/71/2/71_2_131/_pdf
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