Panasonic Rear Projection Tv
Panasonic Rear Projection Tv – Rear projection television (RPTV) is a type of large screen television display technology. Until around 2006, most relatively affordable consumer large-screen televisions up to 250 cm (100 inches) used rear-projection technology. One variant is a video projector, using similar technology, which projects onto a screen.
Three types of projection systems are used in projection televisions. CRT rear projection televisions were the first, and although they were the first to exceed 40″, they were also bulky and the image was not clear at close range. LCoS was capable of producing high definition content up to 1080p resolution, and Examples include Sony’s SXRD (Silicon X-tal Reflective Display), D-ILA (Digital Direct Drive Image Light Amplifier) by JVC and Liquid Fidelity by MicroDisplay Corporation.
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CRT technology was very limited in the early days of television. It was based on conventional glass blowing methods largely unchanged over the centuries. Since the tube had to maintain a very high vacuum, the glass was under considerable pressure, coupled with the low deflection angle of CRTs of the time, the practical size of CRTs without increasing their depth is limited.
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The largest practical tube that could be capable of mounting horizontally in a television cabinet of suitable depth was about nine inches. Twelve inch pipes could be made, but they were so long that they had to be placed vertically and looked through an angled mirror. Top of the cabinet. In 1936, the British government convinced the British Broadcasting Corporation to launch public high definition (for the time)
The main driver of the move by the British government was to set up manufacturing facilities for cathode ray tubes which they believed to be important if the expected Second World War materialized.
The ability to correct deflection signals for aberrations in tube geometry had not yet developed, and relatively long tubes relative to the screw size needed to be made to minimize distortion. However, as the face of the pipe had to be convex to provide resistance to the air pressure, this mitigated the problem, but only if the organ’s center of deflection was approximately the wall’s center of curvature. This requires a relatively long pipe for its screen size. The accelerating voltage used for the tubes was very low by later standards and even a twelve inch tube only operated on a 5000 volt supply. Early white phosphors were not as efficient as later offerings, and early televisions had to be viewed in dim lighting.
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In 1937, both Philips and HMV showcased at the Radiolympia show in London televisions having a screen size of 25 inches based on the same MS11
It was the subject of an advertising campaign prior to the show that generated a lot of interest. The back of the TV projected the image from a 4+1 ⁄-inch tube onto a 25-inch etched celluloid screen sandwiched between two panels of glass for protection. The size of the pipe was dictated by the fact that it was the largest pipe that could be made with a flat screw. It was not realized at the time that a curved screen is optically better if the center of curvature of the screen is approximately the same point as the center of curvature of the mirror. The tube was mounted vertically in the bottom of the cabinet with the screw pointing down to a concave mirror that reflected the image up to an angled mirror at the top of the cabinet to the 25 inch screen, the top of the tube mirror box had A Schmidt LS
To correct for aberrations. Since the image had to be enlarged to illuminate a screen that had about 100 times the image area on the face of the tube, the image on the tube had to be very bright. To achieve the required brightness, the tube was powered by a boosted power supply of 25,000 volts.
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According to the tube type number, the phosphor was brighter for a given beam current than contemporary white phosphors.
Unfortunately, both Philips and HMV had to withdraw their sets from the exhibition on the afternoon of the first day, as the CRTs failed in both cases. Customers who purchased the sets were disappointed to find that their tubes rarely lasted more than a few weeks (bearing in mind that there was only an hour of television broadcast per day). In November 1937, Philips decided it was cheaper to buy back the sets than to continue replacing the tubes under warranty, which had become difficult to source as demand outstripped supply.
In 1938, Philips significantly overcame the shortcomings of the earlier cathode ray tube to produce the Philips/Mullard MS 11/1
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This new tube is fundamentally similar but has a larger cathode requiring higher heater power capable of supporting higher beam current.
This new tube retained the previous tube’s stoneware phosphor screen. The TV also had a smaller 21-inch screen that was about three-quarters the area of the previous year’s model, which meant the tube didn’t have to be pushed as hard. Buyers of this later model could only use it for a year or less as television broadcasts were suspended in 1939 for the duration of World War II. Both models of the television had a problem that the high acceleration voltage on the tube meant that it produced considerable X-radiation, something that was never thought of in the 1930s.
In the United States of America, television broadcasting became more widespread after World War II.
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Although cathode ray tube technology improved during the war so that tubes became shorter for their size, as distortions could now be corrected, twelve inches was still the practical limit on size. However, it is now possible to mount a twelve-inch pipe horizontally in a reasonably sized cabinet. As a result of these size limitations, rear projection systems became popular
Use a 3 or 4 inch monochromatic CRT with a very high accelerating voltage for the size (usually 25,000 volts)
), the tube produced the extremely bright image which was projected by a Schmidt ls assembly and mirrored onto a semi-transparent screen typically sized from 22.5 to 30 inches diagonally using an optical system almost identical to the earlier Philips system described above. The only change was that RCA used the optically superior convex screen on the tube because it was understood that the Schmidt LS did not need to correct the curvature of the tube face but only for the spherical aberration of the mirror. The resulting image was darker than a direct view CRT and had to be viewed in very subdued lighting. The degree of drivability of the pipe meant that the pipe had a relatively short life.
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When British television broadcasting resumed in June 1946, television production resumed slowly, mainly due to material shortages after the war. As already noted, twelve inches is still the practical upper limit for Direct-View CRTs. In response, in 1950, the Philips company through its Mullard subsidiary introduced a new projection tube, the MW6/2.
2+1 ⁄ inches and now featured a convex face, with the intermediate American developments. It was also about four inches shorter and now featured a more efficient white phosphor developed during the war. This tube allowed for a more compact rear projection system. The tube was mounted horizontally and directed at a concave mirror as before, but this time the reflected image was rotated ninety degrees by a flat mirror with a central hole for the tube. It was bounced up by a Schmidt correction before it bounced another ninety degrees to hit the screen.
The new tube and optical system offered several advantages over the previous system. The set locker was able to be smaller. Previously, the screen sat on top of a substantial piece of furniture, but this new system allowed the screen to occupy a position similar to that of a direct-view television in a standard console-sized cabinet. Schmidt is still required to correct the image for spherical aberration of the mirror.
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The use of an additional plane mirror allowed the deflection coils and focusing magnets to be placed behind the mirror out of the path of the light. They have previously partially abstracted the image of the concave mirror by being somewhat larger than the tube screen. The optical box that housed the tube was also designed to shield the X-rays produced by the tube. The optical boxes are produced in three versions for
19+ 7⁄8 in. [diagonal] screws. Two other sizes are available for frontal projection on 44-inch or 52-inch screens.
The only difference was in the position of the tube screw in relation to the concave mirror and in the optical characteristics of the Schmidt LS. This new system
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