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Mitsubishi WD-60737 60" DLP Projection TV


A CRT (Cathode Ray Tube) is an established technology that’s been around for a very long time. Tube based TVs were the norm before microdisplays such as LCD, DLP, and LCoS hit the market. The illustration below details the inner components of a CRT based TV.

CRT projection

CRTs consist of a large vacuum tube with a glass screen on one end, and electron beams on the other. The glass screen is coated with phosphors that produce light when excited by an electron beam. A shadow mask is used to make sure the beam hits the exact correct spot. The beam rapidly scans a line horizontally from top to bottom producing an image. To make a color image, CRT-based rear-projection TVs use three electron guns (red, green, and blue). Keep in mind that there are no fixed pixels in rear projection CRT TVs. The horizontally scanning beam makes CRTs an analog device, and all digital video signals (HDMI, DVI) will have to be converted to analog.

Production Update

CRT HDTVs are no longer in production. Flat panel displays became too cheap for CRT TVs to compete. Look for SEDFED, or LaserVue technologies which have aspects similar to CRT.



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