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Display glasses have screens for showing content but no cameras. Examples: Even Realities G1, Vuzix Z100. These devices are ideal for information display and heads-up interfaces.

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Common Display Glasses

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Even Realities G1

  • Display: Green monochrome, 640×200 resolution
  • Microphone: Yes
  • Speaker: No (audio through phone)
  • Camera: No
  • Buttons: No
  • LEDs: No
// G1 capabilities
{
  modelName: "Even Realities G1",
  hasDisplay: true,
  hasCamera: false,
  hasMicrophone: true,
  hasSpeaker: false
}

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Vuzix Z100

  • Display: Green monochrome
  • Microphone: No
  • Speaker: No
  • Camera: No
  • Buttons: No
  • LEDs: No
// Z100 capabilities
{
  modelName: "Vuzix Z100",
  hasDisplay: true,
  hasCamera: false,
  hasMicrophone: false,
  hasSpeaker: false
}

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Building for Display Glasses

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Check Display Capabilities

protected async onSession(session: AppSession, sessionId: string, userId: string) {
  const caps = session.capabilities;
  if (!caps?.hasDisplay) {
    session.logger.warn('No display available');
    return;
  }

  const display = caps.display;
  if (display) {
    session.logger.info('Resolution:', display.resolution);
    session.logger.info('Is color:', display.isColor);
    session.logger.info('Max lines:', display.maxTextLines);
  }
}

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Adapt to Display Size

const maxLines = caps.display?.maxTextLines || 3;

if (maxLines < 5) {
  // Small display - brief message
  session.layouts.showTextWall('Done!');
} else {
  // Larger display - more detail
  session.layouts.showReferenceCard('Complete', 'Task finished successfully');
}

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Monochrome Displays

const isColor = caps.display?.isColor;

if (!isColor) {
  // Monochrome - use high contrast
  session.layouts.showTextWall('Status: Active');
  // Avoid complex graphics
} else {
  // Color display available
  session.layouts.showTextWall('✓ Status: Active');
}

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Audio Routing

Display glasses without speakers route audio to the phone: 
if (!caps.hasSpeaker) {
  // Audio plays through phone
  await session.audio.speak('Hello!');

  // User hears through phone speaker or Bluetooth headphones
}

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Input Methods

G1 has microphone for voice input: 
if (caps.hasMicrophone) {
  session.events.onTranscription((data) => {
    if (data.isFinal) {
      session.layouts.showTextWall(data.text);
    }
  });
}
Vuzix has no microphone - use phone for input: 
// Voice input happens through phone's microphone
session.events.onTranscription((data) => {
  // Still works - uses phone mic
});

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Display Best Practices

Keep text concise: 
// ✅ Good - readable
session.layouts.showTextWall('Message sent');

// ❌ Avoid - too much text
session.layouts.showTextWall(
  'Your message has been successfully sent to the recipient and they will receive it shortly'
);
Use appropriate layouts: 
// Simple status
session.layouts.showTextWall('Ready');

// Structured info
session.layouts.showReferenceCard(
  'Weather',
  'Sunny\n72°F\nHumidity: 45%'
);

// Two-part content
session.layouts.showDoubleTextWall({
  topText: 'Question:',
  bottomText: 'What is 2 + 2?'
});
Test on actual hardware:
  • Display sizes vary
  • Text may be smaller/larger than expected
  • Green monochrome has limited contrast

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Example App

class DisplayGlassesApp extends AppServer {
  protected async onSession(session: AppSession, sessionId: string, userId: string) {
    const caps = session.capabilities;

    if (!caps?.hasDisplay) {
      session.logger.warn('No display - audio only');
      await session.audio.speak('Welcome');
      return;
    }

    // Show welcome on display
    session.layouts.showTextWall('Voice Assistant Ready');

    // Use microphone if available
    if (caps.hasMicrophone) {
      session.events.onTranscription((data) => {
        if (data.isFinal) {
          this.handleCommand(session, data.text);
        }
      });
    } else {
      // Phone microphone still works
      session.events.onTranscription((data) => {
        if (data.isFinal) {
          this.handleCommand(session, data.text);
        }
      });
    }
  }

  private handleCommand(session: AppSession, text: string) {
    session.layouts.showTextWall(`You said: ${text}`);

    // Speak response if no speaker on glasses
    if (!session.capabilities?.hasSpeaker) {
      session.audio.speak('Processing');
    }
  }
}

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Next Steps

Camera Glasses

Mentra Live - camera features

Display & UI

Using layouts and dashboard

Audio

Audio features

Overview

Back to overview