Roku TV is going 4K, with content from Netflix

LAS VEGAS—CES is the best place to find outrageous TVs: OLED, 4K, curved, flat, smart, 100-inchers, you name it, some costing in the five-figure range. But if you poke around you can also find some TVs that make sense to normal consumers—TVs you can buy at Walmart. Last year, Roku made a splash by partnering