# Xam ceev cov tshuab xam zauv

### Dab tsi yog qhov ceev ceev

Pixels ib nti (PPI) yog kev ntsuas lub ntsuas lub pixel (kev daws teeb meem) ntawm cov khoom siv hauv ntau cov ntsiab lus: feem ntau siv cov duab hauv computer, cov duab thaij duab, thiab lub koob yees duab digital sensors. Lub PPI ntawm lub computer tso tawm tau cuam tshuam nrog qhov loj me ntawm cov zaub hauv nti thiab tag nrho cov lej ntawm cov kab rov tav thiab ntsug.

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### Ntau nyob ntawm pixel ceev

Yog tias koj xav suav lub pixel ntom ntawm koj lub vijtsam, koj yuav tsum paub: kab rov tav thiab ntsug pixel suav thiab koj daim duab kab pheeb ces kaum loj. Tom qab ntawv siv cov mis no, lossis siv peb lub laij lej;)

$$d_p = \sqrt{w^2 + h^2}$$ $$PPI = \dfrac{d_p}{d_i} \ \$$ where

 $$w$$ yog dav daws teeb meem hauv pixels $$h$$ yog qhov siab daws teeb meem nyob rau hauv pixels $$d_p$$ yog kab pheeb ces kaum kev daws teeb meem nyob rau hauv pixels $$d_i$$ yog kab pheeb ces kaum loj hauv nti (qhov no yog tus lej tshaj tawm raws li qhov loj me ntawm cov zaub)

Yog tias koj xav paub ntau ntxiv, mus saib qhov kev paub zoo Linus Cov Lus Qhia Hauv Qab No.

### Keeb kwm kev txhim kho ntawm PPI (daim ntawv teev cov khoom siv)

#### Txawb tooj ntawm tes

Ntaus lub npe Pixel ntom (PPI) Cov zaub daws teeb meem Cov zaub me me (ntiv tes) Xyoo qhia Txuas
Motorola Razr V3 128 176 x 220 2.2 2004
iPhone (first gen.) 128 320 x 480 3.5 2007
iPhone 4 326 960 x 640 3.5 2010
Samsung Galaxy S4 441 1080 x 1920 5 2013
HTC One 486 1080 x 1920 4.7 2013
LG G3 534 1140 x 2560 5.5 2014

#### Ntsiav tshuaj

Ntaus lub npe Pixel ntom (PPI) Cov zaub daws teeb meem Cov zaub me me (ntiv tes) Xyoo qhia Txuas
iPad (first gen.) 132 1024 x 768 9.7 2010
iPad Air (also 3rd & 4th gen.) 264 2048 x 1536 9.7 2012
Samsung Galaxy Tab S 288 2560 x 1600 10.5 2014
iPad mini 2 326 2048 x 1536 7.9 2013
Samsung Galaxy Tab S 8.4 359 1600 x 2560 8.4 2014

#### Khoos phis tawj qhia

Ntaus lub npe Pixel ntom (PPI) Cov zaub daws teeb meem Cov zaub me me (ntiv tes) Xyoo qhia Txuas
Commodore 1936 ARL 91 1024 x 768 14 1990
Dell E773C 96 1280 x 1024 17 1999
Dell U2412M 94 1920 x 1200 24 2011
Asus VE228DE 100 1920 x 1080 27 2011
Apple Thunderbolt Display 108 2560 x 1440 27 2011
Dell UP2414Q UltraSharp 4K 183 3840 x 2160 24 2014