| 品牌 | 邁晶電子 | 型號 | wj204a |
| 種類 | lcm液晶模塊 | 屏幕尺寸 | 3（英寸） |
| 色彩 | 單色 | 亮度 | 高亮 |
| 對比度 | 可選 | 分辨率 | 20*4 |
| 像素 | 20*4 | 可視角度 | 6（°） |
| ②mechanical specifications | ||||||
| item | normal dimensions(mm) | |||||
| module size(w×h×t) | 98.0×60.0×14.0 | |||||
| viewing area(w×h) | 76.0×26.0 | |||||
| character size(w×h) | 2.94×4.74 | |||||
| dot size(w×h) | 0.54×0.54 | |||||
| ③pin connections | |||||||
| pin | symbol | function | |||||
| 1 | vss | ground for logic(0v) | |||||
| 2 | vdd | power supply for logic(+5v) | |||||
| 3 | v0 | power supply for lcd driver | |||||
| 4 | rs | h: data；l: instruction code | |||||
| 5 | r/w | h: read; l: write | |||||
| 6 | e | enable signal | |||||
| 7~14 | db0~db7 | data bus line | |||||
| 15 | led+ | backlight power(+5v) | |||||
| 16 | led- | backlight power(0v) | |||||