20x4 White on Blue Character LCD
The 20x4 Character LCD Display (Blue with White Characters) is an industry-standard HD44780-based alphanumeric LCD capable of displaying 80 characters across 4 lines of 20 characters each. With a wide viewing angle, high contrast, and built-in 5V LED blue backlight, it offers excellent readability in any environment. Featuring a standard parallel interface (4-bit or 8-bit) and 5V operation, it works seamlessly with Arduino, ESP32, Raspberry Pi, and PIC for menu systems, sensor displays, IoT projects, and DIY electronics requiring spacious text layout.
شاشة LCD الحرفية 20×4 (زرقاء مع حروف بيضاء) هي شاشة LCD أبجدية رقمية قياسية مبنية على متحكم HD44780، قادرة على عرض 80 حرفاً موزعة على 4 صفوف، كل صف يحوي 20 حرفاً. تتميز بـ زاوية رؤية واسعة، وتباين عالٍ، وإضاءة LED زرقاء مدمجة 5 فولت، مما يوفر وضوحاً ممتازاً في جميع البيئات. تدعم الواجهة المتوازية القياسية (4-بت أو 8-بت) وتعمل بجهد 5 فولت، وتتكامل بسلاسة مع Arduino و ESP32 و Raspberry Pi و PIC لمشاريع القوائم، وعرض الحساسات، وIoT، ومشاريع DIY التي تتطلب مساحة نص واسعة.
The 20x4 Character LCD Display Module is a professional-grade alphanumeric display that provides ample room for displaying detailed information across 4 rows of 20 characters each, totaling an impressive 80 characters. The display features bright white characters on a vivid blue background with an integrated LED backlight, delivering excellent contrast and readability under any lighting condition — from dim indoor environments to outdoor projects with controlled lighting.
Built around the industry-standard HD44780-equivalent LCD controller, this module is fully compatible with the popular Arduino LiquidCrystal library, as well as similar libraries available for ESP32, ESP8266, STM32, PIC, AVR, and Raspberry Pi. This widespread compatibility makes the LCD an ideal choice for both beginners learning to display data and experienced engineers building professional embedded systems.
The module supports both 4-bit and 8-bit parallel interface modes. The 4-bit mode is most commonly used because it requires only 7 GPIO pins (compared to 11 pins in 8-bit mode), saving valuable I/O for other peripherals. Each character is rendered in a clear 5×8 dot-matrix grid, providing crisp text quality, and the controller supports 8 user-definable custom characters for icons, special symbols, or graphical elements.
The display module operates from a single 5V DC power supply, which powers both the LCD logic and the integrated LED backlight — so no separate power source is needed for backlighting. The wide viewing angle ensures the display remains readable from various angles, making it perfect for panel-mounted instruments, dashboards, and benchtop devices.
The module comes with a generous 76 × 25.2 mm viewing area housed in a sleek black metal bezel measuring 98 × 40 mm, providing a polished and professional appearance suitable for finished products and project enclosures. A free 16-position male header is included for easy connection to breadboards, jumper wires, or PCBs.
Whether you're building a smart thermostat, IoT dashboard, scientific instrument, retro game console, robotics control panel, or industrial monitor, the 20x4 LCD provides plenty of space for clear, organized information display.
Specifications
- Display Format: 20 Characters × 4 Lines (80 characters total)
- Display Color: White Characters on Blue Backlight
- Character Matrix: 5 × 8 dots per character
- Controller: HD44780-Equivalent (Industry Standard)
- Interface: Parallel (4-bit or 8-bit)
- GPIO Pins Required:
- 4-bit mode: 7 GPIO pins
- 8-bit mode: 11 GPIO pins
- Custom Characters: 8 user-definable
- Operating Voltage: 5V DC
- Backlight: LED (Blue)
- Backlight Voltage: 5V (no separate supply needed)
- Module Dimensions (W × H × T): 98 × 60 × 14 mm
- Black Metal Bezel (W × H): 98 × 40 mm
- Viewing Area (W × H): 76 × 25.2 mm
- Operating Temperature: 0°C to +50°C
- Storage Temperature: -20°C to +70°C
- Connector: 16-position single-row header (included)
- Compliance: RoHS Compliant
Standard 16-Pin Pinout
- Pin 1 (VSS): Ground
- Pin 2 (VDD): +5V Power Supply
- Pin 3 (VO): Contrast Adjustment (via potentiometer, typically 10kΩ)
- Pin 4 (RS): Register Select
- Pin 5 (RW): Read/Write
- Pin 6 (E): Enable
- Pins 7–14 (D0–D7): Data Lines
- Pin 15 (LED+): Backlight Anode (+5V)
- Pin 16 (LED-): Backlight Cathode (GND)
Applications
- Multi-Line Sensor Displays — temperature, humidity, pressure, voltage, current
- Menu-Driven User Interfaces — multi-level menus with clear navigation
- Smart Home Control Panels — multi-line status and command displays
- Weather Stations — comprehensive environmental data display
- Robot Control Panels — sensor readouts, status, and operational data
- Industrial Automation — process monitoring and HMI panels
- DIY Calculators & Computers — multi-line input/output displays
- Educational & STEM Projects — teaching display interfacing and HMI design
- 3D Printer Displays — print progress, temperatures, and settings
- GPS & Navigation Devices — displaying coordinates, routes, and waypoints
- Retro Gaming Devices — text-based adventures and arcade-style games
- Server Status Monitors — network, CPU, RAM, and disk usage display
- Aquarium & Greenhouse Controllers — multi-parameter environmental monitoring
- Energy Meters & Power Monitors — voltage, current, power, and energy
- Time, Date & Weather Display Devices — clocks with multi-line info
- Audio Equipment — volume, source, EQ settings, and track info
- Test Equipment — DIY meters, oscilloscopes, and signal analyzers
- IoT Devices — local display for WiFi/LoRa-connected products
- CNC Machine Controllers — coordinates, feed rates, and status
- Replacement Display — for damaged 20×4 LCDs in existing equipment
- Vending Machine Prototypes — product info and transaction details
- Banking/POS Demos — educational point-of-sale system displays