LCD 20×4 blue

An LCD 20×4 blue typically refers to a character-based liquid crystal display module that can show 20 characters per line across 4 rows, with blue backlighting and usually white or light-colored text. These displays (also called 20×4 LCD modules) are very common in hobby electronics, Arduino projects, small embedded systems, and DIY devices.

🔧 Technical Overview

• Format: Text-mode display showing 4 lines × 20 characters (total 80 characters)

• Backlight: Usually LED backlight—most commonly blue (sometimes green, yellow…). Blue often combined with white or light gray characters.

• Controller: Uses the widely adopted HD44780-compatible controller, meaning a huge ecosystem of libraries (Arduino LiquidCrystal, Raspberry Pi LCD, other microcontrollers).

• Interface:

  • Parallel data pins: typically 4‑bit mode (you send data in two 4-bit chunks) plus register select (RS), read/write (R/W), enable (E)

  • Plus power (Vcc, GND), and a backlight power pin (LED+ / LED–)

  • Often includes a contrast adjustment via a potentiometer connected to the VO (contrast) pin

Specification

• Text Color: White

• Back light: Blue LED Backlight

• Dimensions: 98mm x 60mm x 14mm