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Screen Sizes Impact on Picture and Sound - Dolby Laboratories Inc.

Screen Sizes Impact on Picture and Sound - Dolby Laboratories Inc.

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<str<strong>on</strong>g>Screen</str<strong>on</strong>g><br />

60º<br />

45º<br />

30º<br />

Prime Seat<br />

Rear Wall<br />

Figure 1: Subtended screen angles<br />

From a projector’s point of view, the most obvious significance of increased<br />

screen size is the need for more projecti<strong>on</strong> illuminati<strong>on</strong>, if the st<strong>and</strong>ard 16<br />

foot-lambert illuminati<strong>on</strong> is to be maintained; the implicati<strong>on</strong>s of this will be<br />

discussed further.<br />

First-Order Effects<br />

There are obvious relati<strong>on</strong>ships between subtended screen angle <strong>and</strong> the<br />

filmgoer’s experience. As the screen angle gets larger, the story impact gets<br />

greater (Figure 2)—the audience feels less like TV watchers, <strong>and</strong> more like<br />

participants in the acti<strong>on</strong> <strong>on</strong> the screen. The eye’s theoretical field-of-view is<br />

110 degrees—a movie screen subtending such an angle is hard to ignore! All the<br />

c<strong>on</strong>necti<strong>on</strong>s between eye <strong>and</strong> brain are derived from the film, <strong>and</strong> the observer<br />

is potentially completely involved in the film.<br />

2

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