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Unverified85% confidenceDecision RuleTime unknown

投影比（throw ratio）决定投射距离与画面尺寸关系。普通便携机投影比约1.2-1.5，投100寸画面需约2.6-3.3米距离；小房间或床头使用应选投影比≤1.2的机型，否则无法投出足够大的画面

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Unverified投影距离决定画面：短焦比（如0.8:1）能在1.5米内投出100寸，普通投射比（1.2-1.4:1）需要2.5-3米。小房间/近距离场景务必看投射比而非只看'最大投影尺寸'91% similar Unverified投影距离与画面尺寸关系由投射比决定，投射比1.2的机器投100寸需约2.6米距离；小户型选投射比≤1.2或支持自动梯形校正与画面缩放89% similar Unverified投影距离与画面尺寸需匹配投射比：普通长焦机(投射比1.2左右)投100寸需约2.8米距离，小户型或客厅进深不足3米应选投射比≤0.8的短焦或超短焦激光电视88% similar Unverified观影距离与画面尺寸有比例关系：标准焦投影100英寸画面需约2.8-3.2米投距；房间进深不足选短焦机型，墙面紧贴选超短焦（激光电视）87% similar Unverified投影比（Throw Ratio）决定画面大小，短焦投影比≤1.2的机型在3米内可投出100寸，普通1.2-1.5投影比机型需2.5-3米才能投100寸，小户型/卧室必须看投影比而非只看亮度85% similar

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