Kenneth Li – Page 2 – Display Daily

What Happened to Non-Digital Displays?

by Kenneth Li

In the 21st century, the word “DISPLAY” automatically equates to some kind of digital display. It could be a computer monitor, an LCD television, an LED video display, etc. Not too may years ago, …

Tags:LED| Vol 24 - Issue 16

Importance of Light Recycling in LED and Laser Phosphor Light Sources for Projection Systems

by Kenneth Li

Etendue and brightness are two related terms that create never-ending thoughts and discussions. Recently, I re-read my previous article, “My Etendue Story”, and came up with new thoughts on how important light recycling is …

Tags:LED| Optics| Projectors| Vol 24 - Issue 12

For 360º Viewing, You Need 360º Content

by Kenneth Li

In the last two months, I wrote a two-part article describing the nature of fundamental properties of light field displays, which are applicable to VR/AR goggles and display screens. The amount of information required …

Tags:360 Degree Cameras| Vol 24 - Issue 08

Light – Particles or Waves? Light Field – Wave or Geometric Optics? – Part 2

by Kenneth Li

A few weeks ago Photon – Particle or Wave? Light Field – Wave or Ray? at whether, in designing display optics, you really need to decide whether to work as though light is a …

Tags:Light Field Displays| Vol 24 - Issue 04

Photon – Particle or Wave? Light Field – Wave or Ray?

by Kenneth Li

Is a Photon a Particle or Wave. Is a light Field a Wave or a Ray? It depends on how you look at it. Years ago, I was teaching an undergraduate optics class in …

Tags:Light Field Displays| Vol 24 - Issue 01

Speckle Reduction Could Make Use of “Almost Free” Digital Processing

by Kenneth Li

Speckle has been a major challenge for lasers to be used for display systems in laser projectors and used for other illumination purposes. The coherent nature of laser light creates pockets of lights through …

Tags:Laser| Speckle| Vol 23 - Issue 48

Uber, Ubering, and Ubered. I Finally Ubered.

by Kenneth Li

During my decades of working life, I have travelled around the world many times and rented cars and hailed taxis endless number of times. Usually, for a one-day trip, I used taxis, and for …

Tags:Automotive| Vol 23 - Issue 42

Color Image Reproductions and Hi Fi Audio

by Kenneth Li

With the advancement in direct laser projection, the reproduction and accuracy of colors is getting more attention. Commercial units are already available and operating from several makers, including Christie Digital, Barco, NEC, etc. Beside …

Tags:Colour (Color)| Colour Management & Processing| Laser Projectors| Vol 23 - Issue 31

Speckle Contrast Reduction Important for Laser Projectors

by Kenneth Li

Speckle has been a major obstacle for lasers to be used for display systems like laser projectors and other illumination purposes. It is usually quantified by the parameter ‘speckle contrast.’ Speckle contrast reduction became …

Tags:Laser Projectors| Speckle| Vol 23 - Issue 28

Analogue Light Field Displays are More Convincing than Digital

by Kenneth Li

Light Field Display may not be a familiar term to most people. Instead, most of us may have come into contact with applications such as virtual reality viewers, stereoscopic displays, 3-D televisions, 3-D pictures, …

Tags:Light Field Displays| Vol 23 - Issue 06

My Etendue Story

by Kenneth Li

Etendue is a familiar word among optical engineers especially projection engine designers. It represents how “spread out” the light from a source is. The unit of measure is simply (sr * m²), the product …

Tags:Fibre optics| Laser Phosphor Projectors| Optics| Projectors| Vol 22 - Issue 47