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1. Projection and rear projection
1.1 Front projection principle
In a front projection system, the user is located on the same side of the screen as the image projection device. The screen is therefore illuminated from the front (figure 2 ).
The main disadvantage of front projection is its ability to diffuse ambient light. In order to achieve good brightness of the projected image, it is necessary to use a highly reflective white screen. Unfortunately, this has the effect of increasing the reflection rate of ambient light and consequently raising the minimum luminance value that can be achieved (black level). This in turn reduces C contrast:
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Projection and rear projection
Cathode ray tubes
Bibliography
References
Standardization
- EBU Standard for Chromaticity Tolerances for Studio Monitors - EBU Tech. 3213 - 8-78
- Television – 1920 × 1080 Image Sample Structure, Digital Representation and Digital Timing Reference Sequences for Multiple Picture Rates - SMPTE 274-M - 2005
- Parameter values for the HDTV standards for production and international programme exchange - ITU-R BT.709-3 - 2-98
Manufacturers
(non-exhaustive list)
These lists are not exhaustive.
Projection tubes
Hitachi
Panasonic
Toshiba
Organizations
International Commission on Illumination (CIE)
Union européenne de radio-télévision – European Broadcasting Union (EBU-UER)
Society of motion picture and television engineers (SMPTE)
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