Modeling of a faceplate in a retinal laser scanner display

Mermillod, Pierre; Milcent, Anne-Marie; Faure, Sylvain; Meyzonnette, Jean-Louis; Taboury, Jean

doi:10.1117/12.798218

Cited by 1 publication

(1 citation statement)

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“…5 Also, a close packed microlens array can also be used in place of or in conjunction with a diffuser. 6 Figure 2 -Simplified optical layout representation of a windshield Head Up Display…”

Section: Architecturementioning

confidence: 99%

Speckle mitigation techniques for laser point scanned displays in head-up display applications

McDonald

Mermillod²

2023

Advances in Display Technologies XIII

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Laser source displays offer wide color gamut and deep color saturation. However, they also suffer from speckle due to their coherent wave-front interaction with surface roughness or imperfections from any component in the optical chain of the display. Speckle can be offensive to the viewer as it gives the displayed image a noticeable "shimmer" or grainy appearance. For an expanded beam, flood illumination display such as those using a Spatial Light modulator (SLM), there exist methods to minimize this speckle to where it is not noticeable to the viewer. However, a laser scanned display is a different situation as the image is generated by a single flying spot and speckle strategy relying on mitigation of flood illumination imaging cannot be efficiently used. Static components such as close packed microlens arrays used in the diffuser optical plane in a typical Head Up Display (HUD) layout are a good compromise and do a reasonable job mitigating speckle. However, the microlens size must be closely matched to the laser beam spot size to minimize other artifacts such as Moiré pattern in the image. Despite being a good countermeasure against speckle, in high magnification HUD systems, the microlens array structure can be viewed in the image and can sometimes be perceived as "pixelization". We propose utilizing discrete step index motion of a close packed microlens array to both double the perceived image resolution and mitigate speckle.

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“…5 Also, a close packed microlens array can also be used in place of or in conjunction with a diffuser. 6 Figure 2 -Simplified optical layout representation of a windshield Head Up Display…”

Section: Architecturementioning

confidence: 99%