CD 20×4 Blue

Description

The “CD 20×4 Blue” likely refers to a 20×4 character LCD (Liquid Crystal Display) module with a blue backlight. Here’s a description of its key features and functions:

**1. Display Size:** The “20×4” notation indicates the size of the display. It means the LCD module can display 20 characters per line and has 4 lines in total. This provides a total of 80 characters for displaying text or information.

**2. Character Display:** The LCD module is primarily designed for displaying alphanumeric characters, symbols, and custom character patterns. It’s suitable for text-based information or data display.

**3. Blue Backlight:** The “Blue” in the description refers to the color of the backlight. LCD modules often have a backlight for improving visibility in low-light conditions, and blue is a common backlight color.

**4. HD44780 Compatible:** Many 20×4 character LCD modules are compatible with the popular HD44780 controller, which simplifies interfacing with microcontrollers and other devices. It allows for easy control of the display, including writing text and positioning the cursor.

**5. Parallel Interface:** These LCD modules typically use a parallel interface to connect with microcontrollers or other host devices. They require multiple data lines and control signals for communication.

**6. Character Set:** The display often supports a standard character set, including letters, numbers, punctuation marks, and symbols, making it suitable for creating text-based user interfaces.

**7. Adjustable Contrast:** Many LCD modules allow you to adjust the contrast of the characters on the screen for optimal readability.

**8. Backlight Control:** The backlight is typically controllable, allowing you to turn it on or off as needed. Some modules also allow you to adjust the brightness of the backlight.

**9. Row and Column Positioning:** You can position the cursor at specific rows and columns on the display to control where text or symbols are displayed.

**10. Custom Characters:** Some LCD modules allow you to define and display custom characters, which can be useful for creating custom icons or symbols.

**11. 5V Power Supply:** LCD modules like this often operate on a 5V power supply, making them compatible with most microcontroller development boards.

**12. Multiple Languages:** Depending on the module and the controller, they may support multiple languages and character sets.

**13. Versatile Applications:** These displays are used in various applications, including embedded systems, DIY electronics projects, electronic devices, instrumentation, and more.

**14. Real-Time Clock (RTC):** Some modules may feature a real-time clock, allowing you to display and track time and date information.

The “CD 20×4 Blue” LCD module is a popular choice for text-based information displays in electronic projects and devices. Its versatility and clear character display make it a valuable tool for creating user interfaces and providing feedback in various applications.