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Early RPTVs were essentially CRT projectors with a mirror to project onto a built-in screen. They were heavy, weighing up to 500 pounds. [25] The first RPTVs to not use CRTs were launched in 2002, using DLP, LCD and LcOS technologies, requiring a UHP lamp. UHP lamps used in projectors and RPTVs require periodic replacement, as they dim with use.
D-ILA JVC’s Direct-drive Image Light Amplifier based on LCoS technology. SXRD Sony’s proprietary variant of LCoS technology. LED projectors use one of the above-mentioned technologies for image creation, with an array of light-emitting diodes (LEDs)as the light source, negating the need for lamp replacement.
15 kW xenon short-arc lamp used in IMAX projectors. High-intensity discharge lamps (HID lamps) are a type of electrical gas-discharge lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina arc tube. [1]
In contrast, a modern LCD or DLP projector often uses an Ultra-high-performance lamp which has a higher luminous efficacy and lasts for thousands of hours. [5] A drawback of that technology is the warm up time required for such lamps. Older overhead projectors used a tubular quartz bulb which was mounted above a bowl-shaped polished reflector.
In 1955, the company began branding audio speakers and lamps as "PanaSonic" for markets outside of Japan. [16] Further refined to Panasonic, taken from the words "pan" – meaning "all" – and "sonic" – meaning "sound", [ 17 ] the brand was created for the Americas because the National brand was already registered by others. [ 17 ]
Ultra-high-performance lamp. An ultra-high-performance lamp, often known by the Philips trademark UHP, is a high-pressure mercury arc lamp. [1] These were originally known as ultra-high-pressure lamps, [2] [3] because the internal pressure can rise to as much as 200 atmospheres when the lamp reaches its operating temperature.
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