Digital/analog art clocks and vertical clocks are described.

A display apparatus includes: a plurality of first scan lines which extend in a radial direction; a plurality of second scan lines between adjacent first scan lines of the plurality of first scan lines which are adjacent to each other; a plurality of data lines which extend in a circular direction and intersect with the first and second scan lines; and a plurality of pixels in an area partitioned by the first scan lines, the second scan lines, and the data lines, the plurality of pixels being connected to the first scan lines, the second scan lines, and the data lines.

Described systems and methods allow minimizing energy use and increasing battery life of a wearable device such as a smartwatch, by optimizing the way an image displayed to the user is updated in response to an event. In some embodiments, an image of each display object (e.g., clock hand, text, weather symbol, fitness icon) is individually stored in an image cache, such as a processor register or a separate section of memory. A new, updated on-screen image is computed dynamically, by combining cached images of the respective display objects. When the appearance of a current display object must change in response to the event, an updated image of the respective object is cached for future use.

Described systems and methods allow minimizing energy use and increasing battery life of a wearable device such as a smartwatch, by optimizing the way an image displayed to the user is updated in response to an event. In some embodiments, an image of each display object (e.g., clock hand, text, weather symbol, fitness icon) is individually stored in an image cache, such as a processor register or a separate section of memory. A new, updated on-screen image is computed dynamically, by combining cached images of the respective display objects. When the appearance of a current display object must change in response to the event, an updated image of the respective object is cached for future use.

A display apparatus includes: a plurality of first scan lines which extend in a radial direction; a plurality of second scan lines between adjacent first scan lines of the plurality of first scan lines which are adjacent to each other; a plurality of data lines which extend in a circular direction and intersect with the first and second scan lines; and a plurality of pixels in an area partitioned by the first scan lines, the second scan lines, and the data lines, the plurality of pixels being connected to the first scan lines, the second scan lines, and the data lines.