Microsoft PowerPoint - JEITA2016.ppt [互換モード]

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1 SID5 5-: Influence of Pixel Density on Image Quality of Smartphone Displays Satoru Kubota*, Yuzo Hisatake**, Tetsuya Kawamura**, Masanori Takemoto*** Ergo Design Laboratory ~6 cycles per degree (6~ pixels per degree)

2 H p S V p H θ S inch H p V p H θ deg D D cm (pixels per inch) Pixel Density (pixels per degree) Angular Pixel Density inch 当たりの画素数 視角 あたりの画素数 (cycles per degree) Angular Resolution 画面サイズと画素密度との関係 5 年発売機種 K 4K 8K モニターとノート除く 95 機種 画素密度 (ppi) : テレビ N=6 : スマホ N=9 : タブレット N=87 4: カーナビ N=57 画面サイズ ( インチ )

3 頻度 (%) 頻度 (%) 立位 座位 視距離 (cm) 臥位 ~ ~ ~4 ~6 ~8 ~ ~ ~4 ~6 ~8 ~ ~ ~4 ~6 ~8 ~4 ~4 ~44 ~46 ~48 ~5 ~5 ~54 ~56 ~58 ~6 6~ 観視距離 (cm) スマホ テレビ 全体 N=96 5 percentile=8cm Mean=7cm 95 percentile=4cm 臥位 N= 5 percentile=5cm Mean=4cm 95 percentile=cm N=9 (8 世帯 ) 5 percentile=5cm Mean=77cm 95 percentile=47cm 画素密度と視距離から求めた角解像度 (cycles/deg) 6 アプリケーションごとに典型的な視距離を仮定した場合のパネルの角解像度 4K スマホ 5.5 型 4K スマホ 55 型 4KTV 画面サイズ ( インチ ) 4K K アプリと典型視距離 : テレビ 5cm : スマホ 5cm : タブレット 4cm 4: カーナビ 7cm

4 画素密度と視距離から求めた角解像度 (cycles/deg) 6 アプリケーションごとに最短視距離を仮定した場合のパネルの角解像度 4K スマホ 5.5 型 4K スマホ 55 型 4KTV 画面サイズ ( インチ ) 4K K アプリと最短視距離 : テレビ 5cm : スマホ 8cm : タブレット 5cm 4: カーナビ 4cm 6 年 月現在, 最高画素密度の製品 5.5 インチ 86 ppi K 画素密度 (ppi) 5 4 インチ ppi 8 48 WVGA 年度 iphone6s plus iphone6s

5 , 予測実態 画素密度 (ppi), 8KUHD 年度

6 Specifications of evaluated LCD panels and displayed characters Pixel density (ppi) Pixel pitch (mm) Character format Character height (mm) LCD panel format Display area format * Display area size (mm) * (Scaled factor ) * Outer display area was filled with black 4 ppi 58 ppi 588 ppi 76 ppi 86 ppi Gennokaku Gothic-Std Gennokaku Gothic-Medium MSP Gothic MS UI Gothic (Aliased)

7 Pixel Density Gennokaku Gothic-STD Gennokaku Gothic-M MSP Gothic MS-UI Gothic Aliased 86 ppi 76 ppi 588 ppi 58 ppi 4 ppi (a) Visual acuity was measured using SS- Screenoscope (Topcon Corporation, Japan) (b) Near point of accommodation was measured using Accommodo-poly recorder HS-9E (Kowa Co., Ltd., Japan)

8 Frequency N= Mean= cm Near ランドルト環視力 visual acuity (decimal ( 小数視力 acuity) ) Frequency 8 N = 7 Mean = 5.9 cm 6 Min =. cm Max =.5 cm 一対比較時の視距離 Viewing distance (cm) (cm)

9 一対比較時の視距離 Viewing distance (cm) (cm) N= Near 調節近点距離 point of accommodation (cm) (cm) Aliased (bi-leveled) symbols to evaluate the perception of the jagged edges of the symbols. Symbols size were.mm to.mm.

10 一対比較の結果 ( Image 文字表示品質 quality (Interval : 間隔尺度 scale) ) - - Gennokaku Gothic-Standard Gennokaku Gothic-Medium MSP Gothic MS UI Gothic (Aliased font) 4ppi vs 58ppi Pair of comparison 58ppi 588ppi vs vs 588ppi 76ppi 76ppi vs 86ppi GenKSTD ** ** n.s. ** GenKMed ** ** ** n.s. MSP ** n.s. ** n.s. MS Aliase ** ** ** n.s *:p<.5, **:p<., n.s.:not significant Pixel density (ppi) Font 一対比較の判断時間 Evaluation time (sec) ( 秒 ) Gennokaku Gothic-Standard Gennokaku Gothic-Medium MSP Gothic MS UI Gothic (Aliased font) 4 Difference 一対比較における各対の評価差 between each pair of image quality scores

11 一対比較の結果 Image ( 文字表示品質 quality (Interval : 間隔尺度 scale) ) Gennokaku Gothic-Standard Gennokaku Gothic-Medium MSP Gothic MS UI Gothic (Aliased font) Landolt Acuity Resolution (cpd) 画素不可視に必要な画素密度 Required pixel density (ppi) (ppi) 9 8. : Mean for participants Viewing 視距離 distance (cm) (cm) 5.9 cm : Mean for participants 画素密度 (ppi) 6 4 視距離 (cm)

12 Imperceptible 5 MS UI Gothic (Aliased font) Just perceptible 4 Perceptible but not unacceptable Just unacceptable N.S. N= Error bars indicate standard error Unacceptable Pixel density (ppi) Imperceptible Just perceptible 5 4 MS UI Gothic (Aliased font) Error bars indicate standard error Perceptible but not unacceptable Just unacceptable Unacceptable Visual Acuity >=.5 N = 8 Visual Acuity <.5 N = Pixel density (ppi)

13 Image quality (Interval scale) - - Gennokaku Gothic-Standard Visual Acuity >=.5 N = 8 Visual Acuity <.5 N = Image quality (Interval scale) - - Gennokaku Gothic-Medium Visual Acuity >=.5 N = 8 Visual Acuity <.5 N = Image quality (Interval scale) Pixel density (ppi) - - MSP Gothic Visual Acuity >=.5 N = 8 Visual Acuity <.5 N = Pixel density (ppi) Image quality (Interval scale) Pixel density (ppi) - - MS UI Gothic (Aliased font) Visual Acuity >=.5 N = 8 Visual Acuity <.5 N = Pixel density (ppi) Viewing distance (cm) Spearman's ρ = -.549, p <. N= LCD 上のグレーティングパターンで測定した視力 Near visual acuity measured by grating patterns (logmar) on different 近距離対数視力 resolution LCDs(logMAR)

14 % 日あたりの使用時間大学生 47 名の調査結果 日あたりの使用時間 (H)

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