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Laser Display System

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

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  1. Laser Display System Christopher Nigro David Merillat

  2. 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.

  3. Description / Overview (2)

  4. 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

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. 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

  10. Conclusion • Questions? • Comments? • Suggestions?

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