Custom Design Triple Digit 7 Segment LED Display with Minus Sign Common Anode for Refrigerator

Product Overview

Introducing the Custom Design 3-Digit (3½ Digit) 7-Segment LED Display with Minus Sign—a fridge-optimized numeric solution engineered for refrigerator controllers, temperature indicators, and home appliances requiring negative value readouts. Unlike standard displays, its “3½ digit” design (supports values from -199 to 999) and dedicated minus sign enable clear display of sub-zero freezer temperatures (e.g., “-18°C”) and positive fridge temps (e.g., “5°C”), eliminating ambiguity for users.

With a 12.7mm (0.50-inch) digit height, it ensures readability from 1–2 meters (typical kitchen distances), while the slim 38.2×19×8mm form factor fits seamlessly into fridge control panels. The white segments on a black surface (with protective film) boosts contrast with ultra bright multicolor light (white/green/red), and the common anode polarity simplifies integration with standard fridge driver ICs. Backed by low power use, long lifespan, and RoHS/REACH compliance, it’s ideal for 24/7 operation in refrigerators and climate control devices.

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Key Features (Refrigerator-Optimized)

1. 3½ Digit + Minus Sign for Sub-Zero Temps

Negative Value Support: Dedicated minus sign enables clear display of freezer temperatures (e.g., “-18°C”, “-20°C”)—critical for fridge-freezer combos where distinguishing positive/negative values prevents food spoilage (e.g., mistaking “18°C” for “-18°C”).

3½ Digit Range: Covers -199 to 999, fitting all typical fridge/freezer temp needs (fridge: 0–10°C, freezer: -10–-25°C) and leaving room for humidity or timer values (e.g., “50%” humidity).

Protective Film: Shields segments from moisture, food splatters, and frequent wiping (common in fridge use), maintaining clarity and preventing scratches over time.

2. Multicolor Functionality for Fridge-Specific Cues

The display’s multicolor options enable intuitive compartment/temp differentiation—no extra labels needed:

Ultra Bright White: Ideal for standard fridge temps (e.g., “5°C”)—neutral, eye-friendly for daily checks.

Red: Signals freezer temps (e.g., “-18°C”) or alerts (e.g., “-25°C” too cold, “OPEN” door-left-open)—grabs attention for critical info.

Pure Green: Use for secondary metrics (e.g., “50%” fridge humidity, “DEF” defrost mode)—clearly distinguishes from primary temp values.

3. Superior Visibility & Energy Efficiency

High Luminous Intensity: Bright enough to cut through kitchen glare (overhead lights, sunlight) but not harsh in dim kitchens—ensures temps are readable day/night.

Low Power Consumption (Low Current): Extremely low current draw (5-10mA/LED) minimizes fridge energy use—critical for ENERGY STAR-certified models and extends backup battery life (for power outages).

White Segments on Black Surface: High contrast eliminates “washout” and makes digits/minus signs sharp—avoids misreading “-8°C” as “8°C” (a costly mistake for freezer food).

4. Reliable Performance & Easy Integration

Stable Operation in Fridge Environments: Withstands temperature fluctuations (-10°C to 50°C, from fridge interior to kitchen ambient) and minor vibrations (door slamming, compressor cycles)—maintains consistent brightness, no flickering.

Long Lifespan (50,000+ Hours): High-quality LEDs match the 10–15 year service life of most fridges—eliminates frequent display replacements, reducing user hassle.

Common Anode Polarity: Works with standard fridge driver ICs (e.g., TM1637, HT1621)—simplifies circuit design for manufacturers and integrates seamlessly with fridge control systems (temp sensing, defrost triggers).

Easy Assembly: Designed for PCB mounting, compatible with automated production lines—speeds up fridge manufacturing and ensures consistent display alignment.

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Technical Specifications

Applications

While optimized for refrigerator controllers, this display also excels in:

Temperature Indicators: Freezer monitors (e.g., “-20°C”), cold storage sensors (e.g., “-5°C”), or heat pump controllers (e.g., “-3°C” defrost).

Home Appliances: Smart thermostats (e.g., “-2°C” outdoor temp), wine coolers (e.g., “12°C”), or mini fridges (e.g., “8°C”).

Instrument Panels: HVAC control panels (e.g., “22°C” room temp, “-10°C” outdoor), or laboratory cold chamber monitors (e.g., “-80°C” ultra-low temp).

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Why Choose This Custom Display for Refrigerators?

Minus Sign for Freezers: Eliminates temp ambiguity—critical for preventing freezer food spoilage or fridge overcooling.

Fridge-Sized Fit: Slim dimensions fit standard fridge control panels—no need to resize existing designs.

Intuitive Multicolor Cues: White for fridge, red for freezer—users instantly recognize temps without reading labels.

Energy & Cost Savings: Low power use cuts fridge energy bills; long lifespan reduces replacement costs.

Global Compliance: RoHS/REACH certification ensures export to international markets, meeting fridge safety standards.

Shenzhen Guangzhibao (Light-Bo) Technology Co. Ltd is specialized in LED products, including LED 7 segment numeric displays, alphanumeric LED displays,dot-matrix LED Displays, SMD LEDs, LED lamps,LCD backlights,LED light bar, bar gragh arrays and LED direction indicator displays and more.
We offer top quality products at competitive prices to meet different requirement for industry applications. We introduced computerized operation system and complete QC system. Key raw materials are sourced from the US, Japan and Taiwan area, plus,we utilise an array of advanced production equipments from ASM and Risen,such as automatic dice bonding and wire soldering machines . We specialise in offering series of optoelectronic displays in pure green, pure white and ultra blue.All of our products comply with the RoHS Directives. Monthly capacity reaches 3,000,000pcs.
We have been in LED industry for more than 12 years. With more than 10 years OEM and ODM experience, our R&D engineers are at hand for your customization requirements. Samples can be ready in just 10-15 days. Contact us now !