I've designed and built many such TVs for the commercial/industrial vertical. I am currently working on developing such a TV for the consumer market and launching it under the name DUMBO.TV Let me know your thoughts. Reference pix of 70" industrial display using Samsung LCD panel and in-house LCD controller with physical OSD menu buttons along with IR/RS232 control capability: https://imgur.com/a/k6zrH3s
what would you be doing that i couldn't get by just buying a display from one of the big name's "digital signage" lineups? like, for instance, any of these: https://www.cdw.com/search/computer-monitors-displays/large-...
Our company caters to this market by designing and fabricating our own thick metal casings for our displays. We also bond our sourced LCD panels with an additional layer of 1/8” to 1/4” thick anti-glare polycarbonate sheets to help them resist physical trauma. We have also designed our own controller that operates these displays with a super minimal/barebones RTOS. Our controllers can be controlled via RS232, but unlike other displays, we do not have an onboard PHY (Ethernet connectivity capability). This is an industrial requirement that originated due to Stuxnet.
Majority of the large format displays in the market today are more like smart TVs than actual dumb TVs, and though they are great products, they would not last in a real rugged industrial environment. I can create large format displays without the smartness for consumer use at an approximate 50-70% of their price.