LG and Samsung are two of the major suppliers for LCD glass panels used for many major manufacturers. I believe they are sharing production lines for the 98" glass which everyone else repurposes.
But, for OLED, I believe LG stands alone with their product at this time. We likely will see OLET coming from others, but it will be a game of pricing vs. quality much as we saw over the years with Pioneer and Kuro displays.
If LG can drop pricing enough, they will really blow out the market if they are able to maintain quality and reliability. The OLED displays I've seen have been excellent. But, I'm still after a 90"+ display, which LG doesn't deliver on except for traditional LCD.
At the end of it all, there's one thing you can count on. Pricing will drop and quality will improve.