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Hardware

What is Privacy Screen Protector?

A physical screen filter that narrows the viewing angle of a display, preventing shoulder surfing and visual eavesdropping.

Privacy screen protectors are the simplest physical privacy tool — they make your screen invisible from side angles.

How They Work

  • Micro-louver technology blocks light at wide angles
  • Screen appears black when viewed from the side (typically >30 degrees)
  • Person directly in front sees the screen normally (slightly dimmer)

When to Use

  • Working in cafes, airports, or coworking spaces
  • Using your phone on public transport
  • Offices with open floor plans
  • Anywhere sensitive information is displayed in public

Limitations

  • Reduces screen brightness by 30-50%
  • Slightly reduces image clarity
  • Doesn't protect against cameras positioned directly above or behind you
  • Only protects visual privacy, not electronic surveillance

Related Terms

Operational Security

The practice of protecting sensitive information by thinking like an adversary to identify vulnerabilities in your own behavior and communications. OPSEC goes beyond technical tools to address human factors that could expose you.

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