Industrial-Grade 20x4 Character LCD Module with High Brightness LED Backlight and COB Technology

Keywords: Character dot matrix display, LED backlight LCD, Parallel LCD, COB LCD module, STN LCD, LCD display module, LCD module

This product is an LCD 20×4 character dot matrix display module designed for displaying ASCII characters, featuring 4 rows with 20 characters per line. The screen utilizes an STN yellow-green mode LED backlit LCD, displaying yellow-green background with black characters, offering high contrast and a wide viewing angle. The module incorporates the ST7066 universal character driver chip, adopts COB production technology, and connects to the main control MCU via an 8-bit parallel LCD interface, ensuring ease of use.

This product is an LCD 20x4 character dot matrix display module designed for displaying ASCII characters, offering high contrast and a wide viewing angle. The module incorporates the ST7066 universal character driver chip, adopts COB production technology, and connects to the main control MCU via an 8-bit parallel LCD interface, ensuring ease of use. Such character LCD dot matrix display products can be customized in various configurations, including 8x1, 8x2, 16x1, 16x2, 16x4, 20x2, 20x4, 24x2, up to 40x4. Different language character dot matrices can also be selected, and various types of LCD screens and LCD backlights are available. With its built-in character library, data transmission is convenient, making it widely used in instruments and devices that only display ASCII characters.

Q1: What are the core advantages of this 20x4 LCD module, and what applications is it suited for?
A1: This module is engineered specifically for demanding outdoor and industrial environments. Its primary advantages stem from COB (Chip-On-Board) encapsulation technology, which delivers superior resistance to vibration, moisture, and long-term reliability. Combined with a high-brightness LED backlight and an extended operating temperature range, it ensures excellent readability under direct sunlight, extreme cold, or high heat. It is ideally suited for applications such as outdoor enclosures, construction machinery, power systems, industrial automation HMIs, and field instrumentation.

Q2: What is the difference between COB (Chip-On-Board) technology and traditional COG (Chip-On-Glass) or TAB modules?
A2: The key differences lie in the IC mounting method and overall robustness:

• COB (Used in this product): The driver IC is die-bonded and directly potted with epoxy resin onto the PCB. Advantages: Maximum physical robustness, excellent shock/vibration resistance, and superior tolerance to thermal cycling and humidity. It is the preferred choice for industrial-grade applications requiring maximum longevity.

• COG/TAB: The IC is bonded directly to the glass or a flexible circuit. Advantages: Generally lower cost and a thinner profile. Disadvantages: Lower tolerance to environmental stress, making long-term reliability in harsh outdoor conditions inferior to COB.

Q3: What is the module's operating temperature range? Can it operate reliably in extreme cold or heat?
A3: Yes, this is a critical design parameter. Our standard module offers a wide operating temperature range of -20°C to +70°C. For special requirements, custom versions can be provided with an extended range of -30°C to +80°C, ensuring stable operation without display lag or liquid crystal freezing in绝大多数 harsh outdoor industrial scenarios.

Q4: What is the backlight luminance? Is it sunlight readable?
A4: This module features a high-luminance LED backlight (typically ≥500 cd/m², with higher brightness available upon request). For outdoor applications, we highly recommend selecting the version with an anti-glare (AG) or anti-reflective (AR) surface treatment on the polarizer. This significantly reduces specular reflection under direct sunlight, achieving excellent sunlight readability.

Q5: What is the interface type? How do I interface it with my main controller (e.g., PLC, MCU)?
A5: The module uses a standard parallel interface (configurable for 8-bit or 4-bit mode) and is fully compatible with common HD44780 or equivalent controllers. You only need to connect the data bus (D0-D7), control lines (RS, R/W, E), and power lines. We provide detailed datasheets and pinout diagrams. Compatible connectors or ribbon cables are available as options to simplify your integration process.

Q6: What is the ingress protection rating of the module? Is it dust and water resistant?
A6: The standard COB module itself is not a fully sealed unit. Its high reliability primarily comes from the COB encapsulation protecting the internal components. Achieving dust and water resistance requires a system-level approach:

• We offer front-panel sealing solutions, such as adding an optical glass or polycarbonate window with a silicone gasket, which can achieve up to IP65 protection at the front panel.

• Proper sealing must also be applied at the rear where the module mounts to your enclosure.

• We can provide customized assemblies with metal bezels or pre-assembled sealing structures based on your enclosure design.

Q7: What are the power supply requirements? What is the power consumption?
A7: The module typically operates on a single 5V DC supply (3.3V logic compatible versions are available, see datasheet). The LED backlight current is the primary contributor to power draw. However, even high-brightness models consume significantly less power than other display technologies, making the module highly suitable for battery-powered or power-sensitive outdoor devices.

Q8: Can I customize the character set, backlight color, or mechanical dimensions?
A8: Yes, we support various customization services for your project needs:

• Character Set/CGROM: Custom initialization characters, special symbols, or small icons can be implemented.

• Backlight Color: Standard options include Green, Amber, Red, and the most common Blue and White.

• Mechanical & Connector: Adjustments to mounting holes, addition of metal frames/chassis, and changes to FFC/FPC connector orientation or length.

• Optical Enhancement: Provision of Anti-Glare (AG), Anti-Reflective (AR), or Transflective polarizers (for sunlight readability with the backlight off).

Q9: Are samples available? What are the Minimum Order Quantity (MOQ) and lead time?
A9: We support sample orders for testing and evaluation. For standard models, the MOQ is typically low (e.g., 100-500 pcs), depending on specifications. Lead time for standard products is approximately 4-6 weeks. For custom projects, the timeline will be adjusted based on complexity.

Q10: What is the product warranty and expected operational lifetime?
A10: All our industrial-grade modules undergo rigorous testing before shipment. The product comes with a standard one-year warranty. The COB technology itself offers excellent long-term stability. Under specified operating conditions, the LED backlight lifetime typically exceeds 50,000 hours, and the overall module's design life far surpasses that of commercial-grade products.