New Delhi, Sept. 16 -- The idea is pretty simple. Instead of putting another big television in your living room or bedroom, you could place a small Portable Smart Projector on a table, point it towards a wall and suddenly have a giant screen. For anyone who loves watching movies or wants a large display without permanently giving up a chunk of wall space, that sounds rather appealing. Modern projectors have also become much easier to live with. Many now come with built-in streaming platforms, wireless connectivity and speakers, all packed into a device that can be moved around the house.

But there is one thing a projector cannot quite ignore: the room itself. Switch on a TV and it generally looks the same whether the curtains are open or...