Design and Modeling of Light Emitting Nano-Pixel Structure (LENS) for High Resolution Display (HRD) in a Visible Range.

Tsion Eisenfeld,Avi Karsenty

doi:10.3390/nano10020214

Tsion Eisenfeld, Avi Karsenty

Open Access

https://doi.org/10.3390/nano10020214

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Abstract

LENS (Light Emitting Nano-pixel Structure), a new nano-metric device, was designed, simulated, and modeled for feasibility analysis, with the challenge of combining high resolution and high brightness for display, essentially adapted for Augmented Reality (AR) and Virtual Reality. The device is made of two parts: The first one is a reflective nano-cone Light Emitting Device (LED) structure to reduce the Total Internal Reflection effects (TIR), and to enable improved light extraction efficiency. The second part is a Compound Parabolic Concentrator (CPC) above the nano-LED to narrow the outgoing light angular distribution so most of the light would be “accepted” by an imaging system. Such a way is drastically limiting any unnecessary light loss. Our simulations show that the total light intensity gain generated by each part of the pixel is at least 3800% when compared to a typical flat LED. It means that, for the same electrical power consumption, the battery life duration is increased by 38. Furthermore, this improvement significantly decreases the display thermal radiation by at least 300%. Since pixel resolution is critical to offer advanced applications, an extensive feasibility study was performed, using the LightTools software package for ray tracing optimization. In addition to the simulation results, an analytical model was developed. This new device holds the potential to change the efficiency for military, professional and consumer applications, and can serve as a game changer.

Highlights

It was demonstrated in our simulations that, when combined, the cone Nano-Light Emitting Device (LED) and the Compound Parabolic Concentrator (CPC) improve the power efficiency by around 3800% when compared to a conventional flat shape LED
We will be able to realize a realistic model of the LED and its material properties—in LightTools, when the the LED and its material properties—in LightTools, when the distribution from a light source can be simulated by tracing Monte Carlo rays
Ray tracing is a geometric tool allowing the rapid tracing of the light path for narrow collimated beams called rays

Summary

Introduction

In the age of Full High Definition screens, the largest companies are engaged in hard technological battles in order to achieve ever larger image resolutions [1]. The sharper the image, the more it appears to be real, reaching the limits of the eye’s visual acuity, less than 1 arc minute per line pair [2]. There is a clear need for Nano-Display. If it is true that for the moment that the pixels are the size of about 50 to less than 10 microns [5] depending on the application, the day will come when the thirst for resolution will lead us to develop pixels smaller than a micrometer. Researchers will continue to push manufacturing limits even further. Nanotechnology has been able to meet the highest requirements of transistor manufacturers (Intel, AMD, Qualcomm, ARM, Nvidia...)

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