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Screen Size Measures, Study notes of IP Multimedia Subsystems

University of California - Los Angeles (UCLA)IP Multimedia Subsystems

The actual size of text and images on the screen is measured by Pixels Per Inch (PPI).

Typology: Study notes

2022/2023

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From users.tkk.fi/~tgustafs/screensize.html 1 20 April 2007
Screen Size Measures
By Tommi Gustafsson
Contents: 1. Introduction | 2. Screen Size | 3. Pixels per Inch | Acknowledgements
1. Introduction
The size of computer screens is measured in the length of their diagonal. However, the aspect
ratio of these screens (width:height) vary among 4:3, 5:4, and 16:10. Therefore, a screen with a
longer diagonal does not necessarily have a larger area. Moreover, one may be more interested in
the screen height than the screen width. Manufacturers seldom indicate, whether, for example, a
14.1" screen (4:3 aspect ratio) is taller a 15.4" wide screen (16:10 aspect ratio). Perhaps
surprisingly, the former is 0.3 inches taller. Also, it is worth noting that CRT screens actually
have shorter diagonals than what is described.
The screen resolution determines the number of pixels available for use. The more the pixels,
the larger the working area. A higher resolution makes text and images look smaller on the
screen than they do on a lower resolution. The actual size of text and images on the screen is
measured by Pixels Per Inch (PPI). It simply indicates how many pixels there are per inch. The
smaller PPI, the larger texts and images are. PPIs of 96 (±10) are used in many screens, but some
graphics designers and programmers work with screens that have PPI values of 117 and more,
which allows them to have more workspace.
2. Screen Size
2.1. LCD Screens
The diagonal length of LCD screens is the same as in the screen description. E.g. a 17" LCD
screen has a 17" long diagonal.
Regular LCDs (4:3 and 5:4)
4:3 Screens 5:4 Screens
Diagonal
Length 10.4" 12.1" 13.3" 14.1" 15" 16.1" 20.1" 21.3" 16" 17" 18.1" 19"
Width 8.3" 9.7" 10.6" 11.3" 12.0" 12.9" 16.1" 17.0" 12.5" 13.3" 14.1" 14.8"
Height 6.2" 7.3" 8.0" 8.5" 9.0" 9.7" 12.1" 12.8" 10.0" 10.6" 11.3" 11.9"
Area 52 70 85 95 108 124 194 218 125 141 160 176
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Download Screen Size Measures and more Study notes IP Multimedia Subsystems in PDF only on Docsity!

Screen Size Measures

By Tommi Gustafsson

Contents: 1. Introduction | 2. Screen Size | 3. Pixels per Inch | Acknowledgements

1. Introduction

The size of computer screens is measured in the length of their diagonal. However, the aspect ratio of these screens (width:height) vary among 4:3, 5:4, and 16:10. Therefore, a screen with a longer diagonal does not necessarily have a larger area. Moreover, one may be more interested in the screen height than the screen width. Manufacturers seldom indicate, whether, for example, a 14.1" screen (4:3 aspect ratio) is taller a 15.4" wide screen (16:10 aspect ratio). Perhaps surprisingly, the former is 0.3 inches taller. Also, it is worth noting that CRT screens actually have shorter diagonals than what is described.

The screen resolution determines the number of pixels available for use. The more the pixels, the larger the working area. A higher resolution makes text and images look smaller on the screen than they do on a lower resolution. The actual size of text and images on the screen is measured by Pixels Per Inch (PPI). It simply indicates how many pixels there are per inch. The smaller PPI, the larger texts and images are. PPIs of 96 (±10) are used in many screens, but some graphics designers and programmers work with screens that have PPI values of 117 and more, which allows them to have more workspace.

2. Screen Size

2.1. LCD Screens

The diagonal length of LCD screens is the same as in the screen description. E.g. a 17" LCD screen has a 17" long diagonal.

Regular LCDs (4:3 and 5:4)

4:3 Screens 5:4 Screens Diagonal Length

Width 8.3" 9.7" 10.6" 11.3" 12.0" 12.9" 16.1" 17.0" 12.5" 13.3" 14.1" 14.8" Height 6.2"^ 7.3"^ 8.0"^ 8.5"^ 9.0"^ 9.7"^ 12.1"^ 12.8" 10.0" 10.6" 11.3" 11.9" Area 52 70 85 95 108 124 194 218 125 141 160 176

(inch^2 )

Wide Screen LCDs (16:10, 5:3, and 16:9)

16:10 Screens 5:3 Screens 16:9 Screens Diagonal Length 12.1" 13.3" 15.4" 17" 22.2 23" 10.6" 12.1" 15" 17" 13.3" Width 10.3" 11.3" 13.1" 14.4" 18.8" 19.5" 9.1" 10.4" 12.9" 14.6" 11.6" Height 6.4"^ 7.0"^ 8.2"^ 9.0"^ 11.8"^ 12.2"^ 5.5"^ 6.2"^ 7.7"^ 8.7"^ 6.5" Area (inch^2 )^66 80 107 130 222 238 50 65 99 128

2.2. CRT Screens

All normal CRT screens are have 4:3 proportions. The length of the diagonal of CRT screens is actually shorter than described. For example, a 19" CRT screen may have 17.5" long diagonal on the visible screen. You must measure the length of the diagonal manually.

Diagonal Length 14"^ 14.5"^ 15"^ 15.5"^ 16"^ 16.5"^ 17.0" 17.5"^ 18"^ 18.5"^ 19"^ 19.5"^ 20"^ 20.5"^ 21" Width 11.2"^ 11.6"^ 12.0"^ 12.4"^ 12.8"^ 13.2"^ 13.6"^ 14.0"^ 14.4"^ 14.8"^ 15.2"^ 15.6"^ 16.0"^ 16.4"^ 16.8" Height 8.4" 8.7" 9.0" 9.3" 9.6" 9.9" 10.2" 10.5" 10.8" 11.1" 11.4" 11.7" 12.0" 12.3" 12.6" Area (inch^2 )^94 101 108 115 123 131 139 147 156 164 173 183 192 202

3. Pixels per Inch

Note: The diagonal length of LCD screens is the same as in the screen description. E.g. a 17" LCD screen has a 17" long diagonal. The length of the diagonal of CRT screens is actually shorter than described. For example, a 19" CRT screen may have 17.5" long diagonal. You must measure the length of the diagonal manually.

3.1. 4:3 Screens

The table below can be used for 4:3 LCD screens.

Pixels per Inch / Diagonal Length Resolution Abbr. No. of pixels 10.4" 12.1" 13.3" 14.1" 15" 16.1" 20.1" 21.3" 640 x 480 VGA 307.2 k 77 66 60 57 53 50 40 38 800 x 600 SVGA 480.0 k 96 83 75 71 67 62 50 47

1680 x 1050 WSXGA+ 1.764 M 164 149 129 117 89 86 1920 x 1200 WUXGA 2.304 M 187 170 147 133 102 98

3.4. 5:3 Screens (Wide Screen 15:9)

Pixels Per Inch / Diagonal Length Resolution Abbr. No. of pixels 10.6" 12.1" 15" 17" 1280 x 768 WXGA 983.0 k 141 123 100 88

3.5. 16:9 Screens (Wide Screen)

Pixels Per Inch / Diagonal Length Resolution Abbr. No. of pixels 13.3" 1366 x 768 WXGA 1.049 M 118

Acknowledgements

Enderet for pointing out that 13.3" wide screens (16:10) and 12.1" wide screens (5:3) exist. KCK for pointing out that TFT screens that use SXGA resolution have 5:4 dimensions and that 15" and 17" 5:3 screens exist.