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In Reply to: Re: Loewe Planus posted by Karl W. on May 14, 2000 at 01:33:57:
Until they have direct view LCD or OLED displays, CRT displays are the best bet in direct view TV sets. Here is why:All rear projection systems, whether they use LCD's or CRT;s as a light source have to optically enlarge the image to fit the screen size. this optical enargement involves mirrors/prisms/lense which have to maintain registration and be dust free for optimal image quality. Furthermore, the optical system must precisely focus the image on a diffuser screen (the surface you view) NO optical system used in production sets, even those that claim high resolution, actually focus with any sort of precision.
There is another reason to choose a CRT, one not often mentioned, but familiar to users of notebook computers: LCD displays, by their nature have problems with color saturation and contrast across the spectrum. The color gamut of CRT Displays currently exceeds that of LCD displays, and the reliability and useful life of a good CRT far exceeds the useful life of an LCD display. ( as measured in hours before failure) The Color problem is accentuated when projected.
Finally Rear-projection sets require dimmer lighting conditions because (1) the light has to travel farther to hit the screen. (2) devices like LCD's only transmit 5% of the light source through the polarizing filters.
Some of these issues may change with the use of DLP as an image source for rear projection TV's ( color saturation/brightness) but the imprecision introduced by the diffuser screen and the optical system will not change in a set of the price range you are considering. Unlike advances in electronics, preision optics do not get cheaper.
Incidentally, none of the rear projection telvision sets actually display greater than 5-600 vertical lines, although the use of line doublers and progressive scanning give the impression of a sharper picture. The manufacturers claim the sets are "digital ready" and can "decode signals up to 1080i." in actuality they recieve the signal and promptly downconvert it. Sony makes a CRT for computer use that is 24" and displays (barely) 1900 x 1000 pixels RGB. Such a precision instrument costs $2-3000, not to mention a $2-400 video card which can drive 1900x 1000 x 32bpp at 85Hz. FYI the largest LCD made to date is 1600x1200 pixels: the unit is 20" 3x4 aspect, manufactured by NEC and retails for $5000- 6000.
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- Re: Loewe Planus - eggfree 22:11:41 05/16/00 (0)
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