I made a PCB business card that displays a 8 by 8 pixel game of pong on a measly 3V coin battery.
I got the display to run on such low power by doing a display driving technique called multiplexing. I use a decoder or shift register to flash each LED or row individually to use less power at any one moment.
If I were to try and drive all of these LEDs at once, it would be much dimmer and it would likely lower the output voltage of the battery which could shut off the microcontroller.
Lastly, I made sure to use low power electronics such as the STM32l01 which is designed for its low power capabilities.
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