Talk:Bernard J. Lechner

Untitled
Lechner distance definition is wrong. It should be something like this:

The Lechner distance is the distance between the viewer's eye and the TV's screen. Bernard Lechner estimated the average value in the US to be 9 feet. He derived this from housing plans and the thickness of couches and televisions (built from CRTs at the time).

Given the Lechner distance and knowing the visual acuity of the eye, one can calculate the minimum pixel size that the eye can distinguish. A viewer looking at a 25 inch television that is 9 feet away, cannot see detail finer than standard definition. A higher definition television (with the same 25 inch diagonal) would be unnecessary. As a result, there wasn't much pressure in the US to move to higher definition until televisions could be easily built larger than 25 inches.

The average value in Europe is called the Jackson distance. It is named for Richard Jackson, a researcher at Philips in Britain, who calculated the value to be 3 meters.

The average value in Japan is 4 feet (??? there is a name for this). Since Japanese sat closer, they would have benefited from 25 inch televisions with better than standard definition. In fact, Japan had developed an analog HDTV standard before digital started going in the US and Europe. — Preceding unsigned comment added by Mdnahas (talk • contribs) 22:55, 15 March 2014 (UTC)

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Lechner Distance
The paragraph dealing with distance no longer offers references.

"The Lechner Distance chart" correspond to the optimal viewing distance in the ITU BT.500 which presents the optimal distances according to the definition based on the psychophysiological capacity of human vision.

On the subject of "the typical distance between a viewer and their television screen", it does not correspond to the results proposed by more robust and more recent scientific study which compiles different surveys which shows distances twice as large as what is attributed to Lechner. The Ergonomist (talk) 08:19, 10 April 2024 (UTC)