> For the complete documentation index, see [llms.txt](https://longer-vision-robot.gitbook.io/arduino-full-stack/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://longer-vision-robot.gitbook.io/arduino-full-stack/13_display/03_crystal_12864.md).

# 13.3 Crystal Display 12864

**12864** means the display resolution is just **128\*64**, which is a conventional definition in industry. Since [Longer Vision Robot](http://www.longervisionrobot.com) does **NOT** provide this device in the class, students are encourage to purchase **12864** by themselves and test it at home.