Jared, Actually all Computer CRTs are progressive and many display 768p as well as 1440p.
The question is why are there no consumer 720p CRT TVs.
My CRT TV can display both 480p and 1080i natively. When my TV was calibrated it was charged per scan rate.
540p shares the same horizontal and vertical sync frequency as 1080i, that is why all 1080i TV's can display both. 1440i as others mentioned is also at the same refresh rate.
Bryan, 720p was included because some broadcasters preferred progressive scan and liked the fact that it required less throughput than 1080i.
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Jared,
Actually all Computer CRTs are progressive and many display 768p as well as 1440p.
The question is why are there no consumer 720p CRT TVs.
My CRT TV can display both 480p and 1080i natively. When my TV was calibrated it was charged per scan rate.
540p shares the same horizontal and vertical sync frequency as 1080i, that is why all 1080i TV's can display both. 1440i as others mentioned is also at the same refresh rate.
Bryan,
720p was included because some broadcasters preferred progressive scan and liked the fact that it required less throughput than 1080i.