4.0 inch dual-digit seven segment led display | Ultra White

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179 x 122 x 15


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Product Series
Series No:BL-D400A-21
Specification Download:
179 × 122 × 15 mm
In the electronics display market, the 4.0 inch dual-digit seven segment LED display marks a significant advancement, offering unparalleled clarity and size for a variety of applications. This detailed exploration aims to unpack the features, benefits, applications, and real-world impact of these displays, tailored for electronics manufacturers, engineers, purchasers, and administrators.

Unveiling the 4 Inch Seven Segment Display

The 7 segment 4 inch display, also known as the 4 in 7 segment display, is a marvel of modern display technology. It offers a larger visual interface for devices requiring numeric displays that are easily readable from a distance. This enhanced visibility is crucial in applications where information needs to be conveyed quickly and accurately to the user.

Key Features and Advancements

The 4.0 inch dual-digit seven segment LED display stands out with its high brightness, wide viewing angle, and low power consumption. Its robustness makes it suitable for both indoor and outdoor environments, ensuring versatility across various applications.

Applications and Industry Use Cases

These displays are extensively used in public information boards, digital clocks, counters, and high-performance measuring instruments. Their ability to deliver clear, concise information makes them invaluable in sectors ranging from industrial control systems to consumer electronics.

Benefits for the Electronics Sector

The main advantages of incorporating the 4 inch seven segment display into electronic products include improved user experience, enhanced product aesthetics, and the capability to operate in diverse environmental conditions. Their efficiency and reliability can significantly reduce maintenance costs and increase the lifespan of electronic devices.

Case Studies: Transformative Impact

Illustrative case studies will showcase the transformative impact of these displays in real-world scenarios. Success stories from leading electronics manufacturers will highlight the efficiency gains and the enhanced user engagement achieved through the adoption of these displays.

User Testimonials

Gathering insights from engineers and purchasers who have firsthand experience with the 4.0 inch dual-digit seven segment LED display will underline its practical benefits, including ease of integration and operational reliability.

Looking Ahead: The Future of Large-Scale Displays

As technology advances, the potential applications and innovations surrounding the 7 segment 4 inch display continue to expand. This section will explore emerging trends and the future prospects of large-scale display technologies.

Conclusion: The Value of Upgrading to 4 Inch Seven Segment Displays

Adopting the 4.0 inch dual-digit seven segment LED display represents a forward-thinking choice for electronics manufacturers aiming to enhance the functionality and appeal of their products. This conclusion will reaffirm the display's value proposition and encourage stakeholders to consider its integration into their next project.

Call to Action

Electronics manufacturers, engineers, and purchasers are invited to explore the benefits and applications of the 4.0 inch dual-digit seven segment LED display to elevate their products and projects with superior display technology.
4.0 inch dual-digit seven segment led display
4.0 inch dual-digit seven segment led display
Features of 4.0 Inch Dual-Digit Numeric LED Display:
  • Large digit height: 20.30mm for enhanced visibility.
  • Dimensions: 35.80mm x 25.80mm for a compact display.
  • Low current operation for energy efficiency.
  • Options for both Common Anode and Common Cathode configurations.
  • Excellent character appearance for clear readability.
  • High light output for improved visibility in various environments.
  • RoHS compliant for environmental considerations.
Possible Applications:
  • Digital clocks.
  • Counters and timers.
  • Scoreboards and sports displays.
  • Industrial process monitoring.
  • Measurement and testing equipment.
  • Digital signage.
  • Instrumentation panels.
  • Temperature and humidity displays.
  • Information displays in public spaces.
  • Customized numeric display projects.
Dimension and Circuit Drawing:
Related Information


When soldering, leave a minimum of 2mm clearance from the base of the base of the lens to the soldering point. Dipping the lens into the solder must be avoided.

Do not apply any external stress to the lead frame during soldering while the LED is at high temperature.

Recommended soldering conditions:


IR Reflow Soldering (for SMD display)Wave SolderingSoldering Iron
Pre-Heat150-180°CPre-Heat100°C Max.Temperature300°C Max.
Pre-Heat Time120sec Max.Pre-Heat Time60sec Max.
Peak Temperature260°C Max.SolderWave260°C Max.Soldering Time3sec Max.(one time only)
Soldering Time10 sec Max.Soldering Time5sec Max.

Note: Excessive soldering temperature and/or time might result in deformation of the LED lens or failure of the LED

ESD(Electrostatic Discharge)

Static Electricity or power surge will damage the LED.

Suggestions to prevent ESD (Electrostatic Discharge):

n Use a conductive wrist band or anti-electrostatic glove when handling these LEDs

n All devices, equipment, and machinery must be properly grounded

n Work tables, storage racks, etc. should be properly grounded

n Use ion blower to neutralize the static charge which might have built up on surface of the LED’s

 plastic lens as a result of friction between LEDs during storage and handling

ESD-damaged LEDs will exhibit abnormal characteristics such as high reverse leakage current, 

low forward voltage, or “no light on” at low currents. To verify for ESD damage, check for “light on” 

and Vf of the suspect LEDs at low currents.

The Vf of “good” LEDs should be>2.0V@0.1mA for InGaN product and >1.4V@0.1mA for AlInGaP


antistatic notice-smd led

When selecting power for LED systems, it’s essential to understand several key parameters to ensure safe operation, longevity, and optimal performance. Here are some steps and considerations for LED power selection:

  • Determine the Forward Voltage (Vf) of the LED(s):

Each LED has a forward voltage, which is the voltage at which the LED operates when the current is flowing through it. This value can typically be found in the LED’s datasheet.

  • Determine the Forward Current (If) of the LED(s):

The forward current is the current at which the LED is designed to operate. Running an LED at higher than its rated current can reduce its lifespan and increase the heat it produces.

  • Decide on the Configuration:

Series Configuration: When LEDs are connected in series, the forward voltages add up, but the current remains the same.

Parallel Configuration: When LEDs are connected in parallel, the forward voltage remains the same, but the currents add up. This configuration can be risky because if one LED fails or has a slightly lower forward voltage, it can cause the other LEDs to draw more current.

Calculate Total Power Requirements:

Power (W) = Total Forward Voltage (V) x Total Forward Current (A)

For example, if you have three LEDs connected in series, each with a forward voltage of 3V and a forward current of 20mA, the total power requirement would be:

Power = (3V + 3V + 3V) x 20mA = 9V x 0.02A = 0.18W

  • Select an Appropriate Power Supply:
  • Voltage Rating: The power supply voltage should match or slightly exceed the total forward voltage of your LED configuration.
  • Current Rating: The power supply’s current rating should meet or exceed the total forward current of your LED configuration.
  • Safety Margin: It’s a good practice to select a power supply that can provide at least 20% more power than your calculated requirement. This ensures the power supply isn’t operating at its maximum capacity, which can extend its life and ensure safer operation.
  • Consider Additional Features:
  • Dimming Capability: If you want to control the brightness of your LEDs, choose a power supply with dimming capabilities.
  • Overcurrent and Overvoltage Protection: To protect your LEDs, select a power supply with built-in protection mechanisms.
  • Thermal Management: Ensure that the power supply has adequate cooling, especially if it will be enclosed or in a location with limited airflow.
  • Regulation and Efficiency:A power supply with good regulation will maintain a consistent voltage output despite variations in the load. High efficiency ensures minimal power is wasted as heat.
  • Physical Size and Form Factor:Depending on where you plan to place the power supply, its size and shape may be critical factors.

In summary, when selecting power for LED systems, understanding your LED’s requirements and the configuration you plan to use is essential. Then, pick a power supply that meets those needs with some added safety margin, keeping in mind any additional features or constraints relevant to your project.

Here are some well-regarded brands in the industry:

  • Mean Well: One of the most recognized brands in the LED power supply industry, Mean Well offers a wide range of products suitable for both indoor and outdoor applications. Their units often come with features like overcurrent protection, dimming capabilities, and high efficiency.
  • Tridonic: A global leader in lighting technology, Tridonic offers LED drivers and power supplies that cater to various lighting solutions, from simple setups to advanced smart lighting systems.
  • Philips Advance Xitanium: Philips is a well-known brand in the lighting industry, and their Xitanium series of LED drivers are known for reliability and performance. They cater to both indoor and outdoor LED applications.
  • Osram: Another giant in the lighting industry, Osram offers a range of LED drivers and power supplies suitable for various applications, including architectural and street lighting.
  • LIFUD: Specializing in LED drivers, LIFUD is known for its high-quality products that cater to both commercial and residential LED lighting solutions.
  • MOSO: This brand offers a variety of LED drivers, especially for outdoor and industrial applications. Their products are known for durability and performance.
  • TDK-Lambda: With a history in power electronics, TDK-Lambda offers a range of power supplies and LED drivers suitable for various applications, emphasizing reliability and advanced features.
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