Common Cathode vs Common Anode LED Display

Written & reviewed by Steven — Senior LED Display Engineer at DDW, 14 years of experience in LED screen design, installation and technical support.

Published: 8月 31, 2026

Quick answer: In a common anode LED display, red, green and blue LEDs share one supply voltage (around 5 V). In a common cathode design, each color gets its own optimized voltage (for example about 2.8 V for red and 3.8 V for green and blue). Common cathode therefore wastes less power as heat, runs cooler and typically uses 20–40% less energy.

共通陰極と共通陽極

電源アーキテクチャは、LEDディスプレイの効率と熱性能に大きな影響を及ぼします。.

最も一般的な2つのシステムは以下の通りです:

  • 共通陰極
  • 共通陽極
Common cathode LED display – Common Cathode vs Common Anode

共通カソードがなぜ人気を集めつつあるのか

共通カソード方式では、以下の各要素について個別に電圧の最適化を行います:

  • 赤色LED
  • 緑色のLED
  • 青色LED

これにより、不要な電力損失を抑えることができます。.

主な利点としては、次のようなものが挙げられます:

  • 低消費電力
  • reduced 熱 generation
  • 効率の向上

なぜ熱性能なのか
事項

大規模なLEDプロジェクトにおいて、熱は長期的な安定性を確保する上で最大の課題の一つとなります。.

過度な熱は、以下の現象を加速させる可能性があります:

  • 電源の経年劣化
  • LEDの劣化
  • 色の不統一
  • 故障率

This is why energy-efficient architectures are increasingly important.

DDW Engineer Notes: Common cathode LED display

共通カソード技術は、特に以下の分野において有用です:

  • 屋外広告看板
  • 長時間稼働システム
  • 高輝度プロジェクト
  • 高温気候地域

発熱量を抑えることで、通常、システム全体の信頼性が向上します。.

Common Cathode vs Common Anode Comparison

特集共通陽極共通陰極
Supply voltageShared (~5 V)Separate per color
消費電力より高いAbout 20–40% lower
Module temperatureより高い下へ
Cost下へSlightly higher

FAQ

Is common cathode better than common anode?

For energy efficiency, heat and long-term reliability, common cathode is generally better; common anode remains cheaper and widely used.

Why does common cathode reduce heat?

Because each color receives only the voltage it needs, less excess voltage is turned into heat in the driver circuits.

Can I tell if an LED screen is common cathode?

Check the specification sheet or ask the manufacturer; common cathode is usually highlighted as an energy-saving feature.

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