Mode/State of Android Watch face

Basically there are two Modes/States of android watch faces, these are

1.     Interactive Mode
2.     Ambient Mode

Interactive Mode:
When the user moves their wrist to glance at their watch, the screen goes into interactive mode. Your design can use full color with fluid animation in this mode. Interactive mode is open for user to interact with watch face so that here is open for all power consumption. The animation, color all are visible in interactive mode. Picture of Interactive mode : https://developer.android.com/design/media/wear/Render_Interactive.png

Ambient Mode:
Ambient mode helps the device conserve power. Your design should make clear to the user that the screen is in ambient mode. The background color scheme is strictly limited to black, white, and grays. Your watch face may use some color elements on screens that support it provided it is unambiguous that the device is in ambient mode. You can use color elements for up to 5 percent of total pixels. In this mode, the screen is only updated once every minute. Only show hours and minutes in ambient mode; do not show seconds. Your watch face is notified when the device switches to ambient mode, and you should thoughtfully design for it.
Picture of ambient mode: https://developer.android.com/design/media/wear/Render_Ambient.png
As well as there are two special mechanisms for ambient mode which are:
1.      Low bit ambient
2.      Burn In protection

Low Bit ambient:
One reduced color space power saving method is to use a "low-bit" mode. In low-bit mode, the available colors are limited to black, white, blue, red, magenta, green, cyan, and yellow. When designing for low-bit ambient mode, use a black or a white background. For OLED screens, you must use a black background. Non-background pixels must be less than 10 percent of total pixels. You can use low-bit color for up to 5 percent of pixels on screens that support it. You should also disable antialiasing in your paint styles for this mode. Make sure to test your design on devices with low-bit ambient mode.
Other displays save power in ambient mode by not producing any color. When designing for displays which do not use color in ambient mode, the background may be either black or white.

Burn in protection techniques:
When designing for OLED screens, you should consider power efficiency and the screen burn-in effect. When these screens are in ambient mode, the system shifts the contents of the screen periodically by a few pixels to avoid pixel burn-in. Do not use large blocks of pixels in your ambient mode designs and keep 95% of the pixels black. Replace solid shapes in your regular ambient mode designs with outlined shapes in burn-protected ambient mode. Also replace filled images with pixel patterns. For analog watch face designs, hollow out the center where the hands meet to avoid pixel burn-in in this mode.

Reference:
[1] https://developer.android.com/design/wear/watchfaces.html

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