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Size Matters
By Mike “Kirby”
• Can everyone hear?
• Can everyone see?
• Can the message be portrayed in a way
everyone will understand it?
Purpose of t...
• What is the Task
• 4, 6, 8 Rule
• Text Size Requirements
• Viewing Distances
• Screen Height
• Screen Size and Location
...
• View: General Viewing
• i.e. Watching TV, Pictures, Video Conf.
• Read: Detailed Viewing with Clues
• i.e. PowerPoint, W...
Distance to Least Favored Viewer (LFV):
4, 6, 8 Rule
• Viewing: LFV/8
• Reading: LFV/6
• Inspecting: LFV/4
• 24/8 = 3 feet...
• Image Legibility Test 20 Point Arial
• Image Legibility Test 20 Point Times New Roman
• Image Legibility Test 18 Point A...
1-Minute of Arc is the smallest angle that the human eye
can see under ideal conditions.
1-Minute of Arc is 1/60 of a degr...
20/20 Vision is 5 Minutes of Arc
20/40 Vision is 10 Minutes of Arc
Human Eye
Normal visual acuity (20/20) is
the ability t...
For 20/20: α is 5 minutes of arc or 1/12 of a degree
For 20/40: α is 10 minutes of arc or 1/6 of a degree
What does 20/20 ...
“The height of the smallest character shall
not be less than 10 minutes of arc on the
retina of any viewer.” (20/40 vision...
Distance to LFV (feet) Min. Character Height (inches)
16
18
20
22
24
26
28
30
32
34
36
38
40
42
0.57
0.64
0.71
0.78
0.85
0...
• Computers use Points for text size
• Point comes from printing
• 72 Points in one inch
• Display size changes the size o...
• Screen 30 ft away
• Factor of 6 for Reading
• 5 ft (60”) high screen
• Minimum Font Height we are about 1”
• 60” divided...
• Average head height (seated) is about 4’0”
• Average eye height (seated) is about 3’6”
• Image looks better if no less t...
Viewing Angles
Normal line of sight is 15o up or down
• The best viewing is on axis.
• Maximum viewing distance is based on
the detail of the image.
• The off-axis view angle w...
Viewing Area
• Ideal viewing cone is 45o from center line.
• Acceptable viewing cone is 45o from the edges
• Varied answers
• 4 diagonals
• 1 diagonal
• Image within field of view (30o)
• Some people sit in the front row of the
m...
First row should be no closer than the
screen than the width of the image.
(about a 52o viewing cone)
How Close – Nearest ...
• Ceiling at 9’
• Image 6” below ceiling
• Top of image is 8’6” AFF
• Bottom of image is 3’6” AFF
• 8’6”-3’6” = 5’ High
• ...
• Horizontal dimension of an image
expressed in relation to the vertical
dimension.
Aspect Ratio
Standard Definition 4:3
Aspect Ratio - Standard
4 Units
3 Units4
3
= 1.33
Aspect Ratio - HDTV
High Definition 16:9
16 Units
9 Units16
9
= 1.78
Aspect Ratio – HD Computer
High Definition 16:10
16 Units
10 Units16
10
= 1.60
Common Resolutions
16:9
3840 x 2160 4K Ultra HD
1920 X 1080 – 1080p (Full) HD
1366 x 768
1280 x 720 – 720p HD
16:10
2560 x...
• 5’ or 60” Height
• 4:3 (60” x 1.33) 79.8” or 6.65’ Wide
• 16:9 (60” x 1.78) 106.8” or 8.9’ Wide
• 16:10 (60” x 1.60) 96”...
• 16:9 Aspect Ratio
• Width = Diagonal x 0.8693
• Height = Diagonal x 0.4886
Determining LCD Size
60” LCD
• 29.375” High for 60” Display
• 29.375 x factor of 6 = 176.25” or
60” Classroom Display
Diagonal Width Height LFV In LFV Ft
22 19.12 10.75 64.50 5.37
32 27.82 15.64 93.81 7.82
40 34.77 19.54 117.26 9.77
47 40.8...
Will the LCD be Cheaper?
• 4, 6, 8 Rule for LFV
• Character Height should be the driving
factor in determining the height of the
screen.
• Aspect R...
To download this presentation go to:
http://tinyurl.com/nvuutnm
Get this Presentation
Mike “Kirby”
mkirby@gencomminc.com
(...
Size Matters
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Size Matters

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A look into the science and math of how to select a screen size for your classroom or other space.

Published in: Technology, Business
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Size Matters

  1. 1. Size Matters By Mike “Kirby”
  2. 2. • Can everyone hear? • Can everyone see? • Can the message be portrayed in a way everyone will understand it? Purpose of the Room
  3. 3. • What is the Task • 4, 6, 8 Rule • Text Size Requirements • Viewing Distances • Screen Height • Screen Size and Location • Aspect Ratio and Resolution Determining Display Size
  4. 4. • View: General Viewing • i.e. Watching TV, Pictures, Video Conf. • Read: Detailed Viewing with Clues • i.e. PowerPoint, Websites • Inspect: Detailed Viewing without Clues • i.e. Excel, CAD Files, Road Maps What is the task?
  5. 5. Distance to Least Favored Viewer (LFV): 4, 6, 8 Rule • Viewing: LFV/8 • Reading: LFV/6 • Inspecting: LFV/4 • 24/8 = 3 feet • 24/6 = 4 feet • 24/4 = 6 feet *LFV = furthest from screen
  6. 6. • Image Legibility Test 20 Point Arial • Image Legibility Test 20 Point Times New Roman • Image Legibility Test 18 Point Arial • Image Legibility Test 18 Point Times New Roman • Image Legibility Test 16 Point Arial • Image Legibility Test 16 Point Times New Roman • Image Legibility Test 14 Point Arial • Image Legibility Test 14 Point Times New Roman • Image Legibility Test 12 Point Arial • Image Legibility Test 12 Point Times New Roman • Image Legibility Test 10 Point Arial • Image Legibility Test 10 Point Times New Roman • Image Legibility Test 8 Point Arial • Image Legibility Test 8 Point Times New Roman • Image Legibility Test 6 Point Arial • Image Legibility Test 6 Point Times New Roman • Image Legibility Test 4 Point Arial • Image Legibility Test 4 Point Times New Roman What Font Can You Read?
  7. 7. 1-Minute of Arc is the smallest angle that the human eye can see under ideal conditions. 1-Minute of Arc is 1/60 of a degree. Human Eye
  8. 8. 20/20 Vision is 5 Minutes of Arc 20/40 Vision is 10 Minutes of Arc Human Eye Normal visual acuity (20/20) is the ability to resolve a spatial pattern separated by one minute of arc.
  9. 9. For 20/20: α is 5 minutes of arc or 1/12 of a degree For 20/40: α is 10 minutes of arc or 1/6 of a degree What does 20/20 mean?
  10. 10. “The height of the smallest character shall not be less than 10 minutes of arc on the retina of any viewer.” (20/40 vision) Dr. Joy Ebben, Ph.D Smallest Character Size
  11. 11. Distance to LFV (feet) Min. Character Height (inches) 16 18 20 22 24 26 28 30 32 34 36 38 40 42 0.57 0.64 0.71 0.78 0.85 0.92 0.99 1.06 1.13 1.2 1.28 1.35 1.42 1.49 Distance Distance x 0.035625 Character Size
  12. 12. • Computers use Points for text size • Point comes from printing • 72 Points in one inch • Display size changes the size of the character – points are meaningless to projected displays Point vs. Pixel
  13. 13. • Screen 30 ft away • Factor of 6 for Reading • 5 ft (60”) high screen • Minimum Font Height we are about 1” • 60” divided by 768 (vertical pixels) = 12.8 pixels per inch • Use font size 13 or higher Font Size
  14. 14. • Average head height (seated) is about 4’0” • Average eye height (seated) is about 3’6” • Image looks better if no less than 6” from the ceiling • Ideally the lowest the screen can go is 3’6” from the finished floor Sight Lines 4’0” 3’6 ”
  15. 15. Viewing Angles Normal line of sight is 15o up or down
  16. 16. • The best viewing is on axis. • Maximum viewing distance is based on the detail of the image. • The off-axis view angle will be dependent on the surface the image is viewed on. Define the Viewing Area
  17. 17. Viewing Area • Ideal viewing cone is 45o from center line. • Acceptable viewing cone is 45o from the edges
  18. 18. • Varied answers • 4 diagonals • 1 diagonal • Image within field of view (30o) • Some people sit in the front row of the movie theater! How Close – Nearest Viewer
  19. 19. First row should be no closer than the screen than the width of the image. (about a 52o viewing cone) How Close – Nearest Viewer
  20. 20. • Ceiling at 9’ • Image 6” below ceiling • Top of image is 8’6” AFF • Bottom of image is 3’6” AFF • 8’6”-3’6” = 5’ High • 5’ x factor of 6 = LFV at 30 feet Classroom Example
  21. 21. • Horizontal dimension of an image expressed in relation to the vertical dimension. Aspect Ratio
  22. 22. Standard Definition 4:3 Aspect Ratio - Standard 4 Units 3 Units4 3 = 1.33
  23. 23. Aspect Ratio - HDTV High Definition 16:9 16 Units 9 Units16 9 = 1.78
  24. 24. Aspect Ratio – HD Computer High Definition 16:10 16 Units 10 Units16 10 = 1.60
  25. 25. Common Resolutions 16:9 3840 x 2160 4K Ultra HD 1920 X 1080 – 1080p (Full) HD 1366 x 768 1280 x 720 – 720p HD 16:10 2560 x 1600 WQXGA 1920 x 1200 WUXGA 1440 x 900 WXGA+ 1280 x 800 WXGA 4:3 2048 x 1536 QXGA 1024 x 768 XGA 800 x 600 SVGA 640 x 480 VGA
  26. 26. • 5’ or 60” Height • 4:3 (60” x 1.33) 79.8” or 6.65’ Wide • 16:9 (60” x 1.78) 106.8” or 8.9’ Wide • 16:10 (60” x 1.60) 96” or 8’ Wide Classroom Example
  27. 27. • 16:9 Aspect Ratio • Width = Diagonal x 0.8693 • Height = Diagonal x 0.4886 Determining LCD Size
  28. 28. 60” LCD
  29. 29. • 29.375” High for 60” Display • 29.375 x factor of 6 = 176.25” or 60” Classroom Display
  30. 30. Diagonal Width Height LFV In LFV Ft 22 19.12 10.75 64.50 5.37 32 27.82 15.64 93.81 7.82 40 34.77 19.54 117.26 9.77 47 40.86 22.96 137.79 11.48 55 47.81 26.87 161.24 13.44 60 52.16 29.32 175.90 14.66 70 60.85 34.20 205.21 17.10 80 69.54 39.09 234.53 19.54 84 73.02 41.04 246.25 20.52 90 78.24 43.97 263.84 21.99 95 82.58 46.42 278.50 23.21 103 89.54 50.33 301.95 25.16
  31. 31. Will the LCD be Cheaper?
  32. 32. • 4, 6, 8 Rule for LFV • Character Height should be the driving factor in determining the height of the screen. • Aspect Ratio does not effect Character Height • Ceiling height is often the limiting factor for the screen size. Conclusion
  33. 33. To download this presentation go to: http://tinyurl.com/nvuutnm Get this Presentation Mike “Kirby” mkirby@gencomminc.com (801) 971-8936 State Contract# MA513

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