Perhaps, the signage market is generally targeted to equipment that needs to be rather durable and live in a wider temperature range. So typically they have bet

Perhaps, the signage market is generally targeted to equipment that needs to be rather durable and live in a wider temperature range. So typically they have better power supplies, steel rather than aluminum frames, and in the case of LED back lights a longer lasting LED (typically by under driving it IIRC). That said, I think there is solid market for "monitors" which are just the display and an industry standard interface. Sometimes you can get a "tunerless" TV which has fewer smarts.