An LCD2004 is an alphanumeric liquid crystal display capable of showing 20 characters per line across 4 separate lines. It is powered by the industry-standard HD44780 parallel interface controller (or a compatible equivalent), which processes text and structures custom 5×8 dot matrix characters. It is widely used in DIY electronics, industrial test equipment, and automation projects due to its cost-efficiency and readability.Core Technical Specifications

• Display Format: 20 characters 4 lines.
• Operating Voltage: Typically 5V DC.
• Character Matrix: 5 8 dots per character.
• Backlight Options: Blue background with white text, or yellow-green background with black text.
• Current Draw: ~120mA when the LED backlight is active.
• Standard Parallel Interface
  • Communicates directly with the raw HD44780 controller.
  • Requires 7 pins for 4-bit data mode or 11 pins for full 8-bit data mode.