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Laser Display System. Christopher Nigro David Merillat. Description / Overview (1). Produce a simple binary graphical display using a set of diode lasers. Support text displays (stationary and scrolling) with the possibility of images and simple video. Minimize lasers required for display.

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Laser display system l.jpg

Laser Display System

Christopher Nigro

David Merillat


Description overview 1 l.jpg
Description / Overview (1)

  • Produce a simple binary graphical display using a set of diode lasers.

    • Support text displays (stationary and scrolling) with the possibility of images and simple video.

    • Minimize lasers required for display.

      • Should help minimize cost.

    • Provide enough accuracy and synchronization to ensure resulting image appears consistent with minimal jitter and flicker.



Display specifications l.jpg

Specification

Value

Refresh Rate

60 Hz ± 5 Hz

Vertical Resolution

16 pixels

Vertical Height

12.5 cm ± 0.5 cm

Vertical Jitter

< ½ pixel

Horizontal Resolution

100 pixels

Horizontal Field of View

90° ± 1°

Horizontal Jitter

< ½ pixel

Optimal Projection Distance

70 cm

Display Specifications


Target display modes l.jpg
Target Display Modes

  • Target Deliverables

    • Basic Text Display

      • Display basic 8-point text.

    • Scrolling Text Display

      • Display scrolling 8-point text at a configurable speed.

    • Pause Display

      • Pause displays between commands.

  • Goal Deliverables

    • Binary Image Display

      • Display ASCII-encoded binary images.

    • Binary Video Display

      • Display animation, or correlated sets of ASCII-encoded binary images.


Analysis and feasibility 1 l.jpg
Analysis and Feasibility (1)

  • Specification: 60Hz Display

    • Requires a 4-face mirror spinning at 900 RPM.

    • Thus, required laser operating frequency must be approximately 50 kHz.

  • Specification: 16 x 100 Pixel Resolution

    • Frame Size: 200 Bytes

    • Required Bandwidth: 12 kB/s

  • Expected Brightness Approximately 350 cd.


Analysis and feasibility 2 l.jpg
Analysis and Feasibility (2)

  • Horizontal Accuracy

    • Requires electrical timing accuracy of approximately 40 us.

    • Mirror mounting accuracy (horizontal) is not important and can be compensated for in software.

  • Vertical Accuracy

    • Requires vertical mirror mounting accuracy of approximately 0.5 degrees.


Other technical difficulties l.jpg
Other Technical Difficulties

  • Mirror Mounting

    • Mirror faces not mounted on motor shaft’s axis of rotation.

    • Causes nonlinearities in laser reflection angles.

  • Frame Construction

    • Many of the components in this system require accurate or precise mounting.

  • Motor Speed Control

    • If a decent synchronous motor is not found, a speed control system must be implemented to keep mirror rotation speed consistent.


Project status l.jpg
Project Status

  • Current Activities

    • Acquiring Components

      • System Microprocessor Acquired and Functional

        • Motorola MC68332 20 MHz Microprocessor

      • Lasers, motor, and materials required for accurate construction and mounting of system components.

    • Subsystem Design

      • Motor Control

      • Output FIFO Control

      • Output Driver Channel


Conclusion l.jpg
Conclusion

  • Questions?

  • Comments?

  • Suggestions?