20×4 LCD Display Specifications

General

• Display Format: 20 characters × 4 lines
• Character Matrix: 5 × 8 dots per character
• Controller: HD44780 or compatible
• Interface: 4-bit or 8-bit parallel
• Backlight: LED (yellow-green or blue, depending on module)

Electrical Characteristics

• Logic Operating Voltage: 5V DC (some modules support 3.3V)
• Backlight Voltage: typically 5V
• Logic Current Consumption: ~1–2 mA
• Backlight Current: 10–30 mA (varies by model)

Optical & Physical

• Viewing Area: approx. 76 mm × 25 mm (varies by manufacturer)
• Module Dimensions: approx. 98 mm × 60 mm × 13 mm
• Viewing Angle: common options are 6 o’clock or 12 o’clock
• Polarizer Type: normally positive (dark characters on light background)

Pinout (16 Pins)

1. VSS – Ground
2. VDD – +5V
3. V0 – Contrast adjustment (via potentiometer)
4. RS – Register Select
5. RW – Read/Write
6. E – Enable
7. D0 – Data bit 0
8. D1 – Data bit 1
9. D2 – Data bit 2
10. D3 – Data bit 3
11. D4 – Data bit 4
12. D5 – Data bit 5
13. D6 – Data bit 6
14. D7 – Data bit 7
15. LED+ – Backlight positive
16. LED– – Backlight negative

Operating Conditions

• Operating Temperature: 0°C to +50°C (standard models)
• Storage Temperature: –20°C to +80°C