# Design of a Large-Format Scene Simulation System Based on Multi-DMD Optical Stitching

## TL;DR

This paper introduces a system that uses multiple DMDs to create a large-format display by stitching their outputs, achieving high performance suitable for applications requiring large display areas.

## Contribution

The novel contribution is a multi-DMD optical stitching system that quadruples display area without reducing frame rate.

## Key findings

- The system achieves an MTF greater than 0.5 at 50 lp/mm.
- The RMS spot radius is less than 10 μm, indicating near-diffraction-limited performance.

## Abstract

As a widely used display device, the effective display area of a digital micromirror device (DMD) is limited by its micromirror count and pitch, which cannot meet large-format target-plane display requirements. This paper proposes a large-format scene simulation system based on multi-DMD optical stitching, and uses an optical relay to overcome the inability to directly tile DMDs because of their package frames. By constructing a DMD display architecture comprising an illumination module, a relay module, a stitching module, and a projection module, the system quadruples the effective display area relative to a single DMD without sacrificing frame rate. Design results show that the system achieves an MTF greater than 0.5 at 50 lp/mm, with near-diffraction-limited performance; the RMS spot radius is less than 10 μm. All key indicators meet application requirements.