Very few of the people I know wear a watch any more. Most of us just use a mobile phone to tell what time it is when we need to. I do know a few folks that wear a wristwatch, but these guys are the fancy types that like fashion watches to show off. You have probably heard of E-Ink displays before, the tech is huge in the eReader market and other markets as well.
The big benefit of E-ink tech is that the screens are very easy to read in direct sunlight and use very little power. I have had one of the Phosphor E-Ink watches in my hands before and the coolest thing about them is that you can choose the way the screen looks with different arrangements for the time and either black or white backgrounds. The numbers are easy to read the watches are really cool.