The tweet in Japanese has more details. Here's a translation from Google:
また、最近問題の解像度に関し、特許情報だけでは1080P外部→720Pということは断定できず、と安田さん。むしろ内部解像度WQHD→1080Pという可能性も、と。小型液晶の解像度も1080Pの割合が上がってきており、あえて720Pにする動機は乏しい、と。
Also, regarding the resolution of the problem recently, it can not be concluded that patent information alone is 1080P external → 720P, Mr. Yasuda. Rather the possibility of internal resolution WQHD → 1080P, and so on. The resolution of small liquid crystal is also increasing at 1080 P, and motivation to dare to 720 P is poor.