Readability of the Positive-7-Segment Numerals on LCD depending on Direction Angle of Observations and on Illumination

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  • ポジタイプ液晶7セグメント数字表示器の視認方向角と照射照度による正読率の検討
  • ポジタイプ エキショウ 7 セグメント スウジ ヒョウジキ ノ シニン ホウコ

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The readability on the liquid crystal numerical display device with positive type 7 segments was examined under several conditions of circumstances, owing to investigate the visibility. The six samples were classified with respect to the manufactory and the size. The experimental conditions were established so that visual angle was limitted 0.5° to 1.25°, right-left visual direction angle was limitted 30° to 90°, up-down visual direction angle was limitted 0° to 90° and illuminance was limitted 0 lx to 300lx. Four experimental subjects read random indicativefigures with 0 to 9 in the dark room, which were presented for 0.1 second. The following results were obtained from the readability tests.<BR>(1) According the inclination of display board and the variation of illuminance, the visibility on liquid crystal display device was more influenced than printing figure with the visual direction angles.<BR>(2) The parametric curves concerning visual angle showed readabilities vs visual direction angles relations parallel shifted with the visual angles. Its shift was limitted to 30 with total variation ranges of the visual angles in up-down visual direction. And it was significant greater than 20° in the right-eft visual direction.<BR>(3) According to increase of the illuminance, the 100% visual direction angle increased 35° to 73° with the left directions, 42° to 80° with the right directions, 0° to 76° with the up directions, and0° to 48° with the down directions. In general the 100% visibility threshold of up-down visual direction angle showed less value than that of the right-left. And the threshold of down direction showed less value to one half than that of the up directions.

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