Question about Hitachi 53UDX10B 53" Rear Projection Television

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Classification of CRTs

Are the CRTs in a 3-tube RPTV monochrome, black & white, or color? How does one distinguish? Why are there red and green filters on two of the tubes but none on the third one?

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    Soulvisitor Jan 19, 2008

    Since the early 1980's, most big-screen televisions have been rear-projection C.R.T. models. Rather than shooting an image straight at the screen from a single tube, rear-projection models use three smaller tubes that send red, green and blue images through a series of lenses and mirrors, projecting them together onto the screen to create a picture.

    The trouble is, even smaller tubes weigh quite a bit and take up space in the television cabinet. Rear-projection sets are not as bright as plasma models or direct-view single-tube sets; those using bigger C.R.T.'s deliver brighter pictures, but greater size means additional weight.

    New Technologies

    Microdisplay rear-projection TV's get their name from the three chip-based technologies that they variously use to create a picture.

    L.C.D. -- In L.C.D.-based rear projection, red, green and blue lights shine through three tiny L.C.D. screens (replacing the three tubes in traditional rear-projection sets). The images travel a path of lenses and mirrors to appear converged on the screen.

    D.L.P. -- Other sets use Texas Instruments' digital light processing chip, which is covered with thousands of tiny mirrors, each tilting individually to create gray shades from light to dark. Most D.L.P. sets use only one chip to create the image, which is given color by red, green and blue lights spun on a color wheel that reflect off the chip in sequence 120 times per second, so fast that they appear converged. That image passes through lenses and mirrors onto the screen.

    LCOS -- The newest method, liquid crystal on silicon (LCoS), combines characteristics of the other two. Three chips with red, green and blue light can be used to create the picture, or, as with D.L.P., a single chip with red, green and blue light rapidly scans across its surface. In both cases, light is reflected off each chip.



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