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Learn More About Display Size
Display Image Size refers to the active image area displaying a user’s content. It’s not about the size of the screen or display, but about what is being shown.
For BDM Acuity of 200 If the Viewing Ratio is at least | With The Viewing Ratio being no more than | The minimum %Element Height should be at least |
|---|---|---|
0.80 | 1.00 | 0.50% |
1.00 | 1.50 | 0.75% |
1.50 | 2.00 | 1.00% |
2.00 | 3.00 | 1.50% |
3.00 | 4.00 | 2.00% |
4.00 | 5.00 | 2.50% |
5.00 | 6.00 | 3.00% |
6.00 | 7.00 | 3.50% |
7.00 | 8.00 | 4.00% |
8.00 | 9.00 | 4.50% |
9.00 | 10.00 | 5.00% |
Vocabulary
Definitions from the standard include:
The height of an element in relation to the overall Image Height. The BDM %Element Height factor represents the ratio of element height to screen height expressed as a percentage (e.g., 1% represents an element height of 1 unit relative to 100 units screen height). The Standard provides a range of percentages; users of the Standard should vary this percentage according to the content.
A constant derived from the Visual Acuity standards formulas. The Acuity Factor for Analytical Decision Making and Basic Decision Making are different constants, as the formulas to calculate each are different. The Acuity Factor for Basic Decision Making is 200. The Acuity Factor for Analytical Decision Making is 3438. See Annex 1 for a detailed discussion of these factors.
The horizontal distance between the display image and viewer.
The area bounded by the closest and farthest viewer calculations in conformance for viewing the specified content.
Term used in relation to Basic Decision Making. It refers to a group of pixels conveying an item of information (e.g., a character at a given font size).
Viewer positioned at the farthest distance from the screen as defined by the viewing area.
The area bounded by a line drawn 60 degrees from the perpendicular of each edge of the image to determine Closest Viewer.
The difference in height between the floor to the bottom of the image against the Viewing Height. The calculation is expressed as a positive number if the bottom of the image is above the Viewing Height and a negative number if the bottom of the image is below the Viewing Height.
A value derived from the sum of the Image Height and the Image Offset. The Vertical Viewing Factor shall be undefined if the calculation results in a factor that is less than 50 percent of the Image Height. In this case, the closest viewer cannot be defined by the standard, but the farthest viewer still can be defined.
Plan view drawing of the viewing environment.
The distance from the floor to the eye of the viewer.