A 4×20 LCD (Liquid Crystal Display) is a compact yet versatile display module commonly used in various electronic devices and projects. With its dimensions of 4 rows by 20 characters per row, it offers a generous viewing area while remaining suitable for space-constrained applications.
This LCD module employs liquid crystal technology to produce crisp, clear characters against a contrasting background, ensuring readability in different lighting conditions. Each character position can display alphanumeric characters, symbols, and custom-defined patterns, providing flexibility in conveying information.
Equipped with a backlight, typically in blue, green, or white, the display ensures visibility even in low-light environments. Its interface is often compatible with popular microcontrollers and development boards, facilitating easy integration into electronic projects and systems.
Whether used in industrial control panels, consumer electronics, instrumentation, or DIY projects, the 4×20 LCD serves as a reliable and efficient means of presenting data, messages, and status information with precision and clarity.
| Pin | Description |
|---|---|
| 1 | VSS – Ground |
| 2 | VDD – Power supply (+5V typically) |
| 3 | V0 – Contrast adjustment |
| 4 | RS – Register select (0 for instruction register, 1 for data register) |
| 5 | RW – Read/write (0 for write mode, 1 for read mode – typically tied to ground for write-only operation) |
| 6 | E – Enable signal (latch data or command) |
| 7-14 | D0-D7 – Data bus (8-bit parallel data) |
| 15 | A – Anode of backlight LED (positive supply for backlight) |
| 16 | K – Cathode of backlight LED (ground for backlight) |
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