Cost and patent issues AFAIK.What ever happened to that tech that was a flatscreen made up of basically a mini-CRT per pixel?
Finally got rid of our last 19" CRT we've had sitting around for years a couple of weeks ago.
https://www.goodgearguide.com.au/article/357585/canon_signals_end_road_sed_tv_dreams/Canon and Toshiba had been caught off guard by fast growth and subsequent price competition in the flat-panel TV market. As companies rushed to grab market share they cut prices and that made it difficult for SED to compete.
As SED worked on bringing down costs it was hit with another problem.
Ownership of the venture was split with Canon holding the slightly larger share of 50 percent plus one share. In Canon's eyes that made it a subsidiary, but Nano Proprietary, a Texas-based company, disagreed. Nano Proprietary had licensed some of the technology used in SED to Canon and its subsidiaries, but hit the joint venture with a lawsuit arguing that Toshiba retained decision-making powers and so SED wasn't a true subsidiary.
Toshiba quickly sold its stake in the company to Canon and the lawsuit was eventually settled, but SED's commercial chances had been hit again.
Aren't most problems solved by OLED?
(except cost perhaps)
https://www.radiantvisionsystems.com/blog/mura-mura-wallMura is a Japanese word that means unevenness, irregularity, or blemish. In the display industry, this word has been adopted as the name for irregularities and “clouding” effects seen on LCD—and more recently OLED—screens. Also referred to as a luminance non-uniformity, mura’s effects on a display screen detract from the user’s viewing experience and can impede display performance or functionality.
Current LCD backlight can be partitioned into wide horizontal single pixel "tall" lines, doesn't seem too expensive thing to do, and blank lines can be turned off completely. Seems just the thing for mini/ micro LEDs , and better than a 2160 zone "full array" . With 6x less luminance transmitted vertically, its 6x brighter HDR.