What is Laser
NEC is in the unique position of offering a new portfolio of Laser projectors. Solid State Light Sources (SSL) are light producing systems made up of either LED devices or Laser Diodes. Light produced with Laser systems inherently have a longer and steadier brightness that decreases at a much slower pace over time than lamp based systems. This technology offers the highest image quality while its operating life span far exceeds traditional lighting methods.
What to expect from a Laser Projector:
- Lower maintenance costs
- Consistent light ouput
- Longer life
- Constant color rendition
- Up to and including 24×7 operation
- Lower brightness decline during life time
- Better brightness uniformity
- Higher reliability
- Higher contrast
- Wider color gamut
- Lower energy consumption and lower thermal emission
- Instant on/off capability, flexible brightness adjustment (20-100%)
- Mercury free
Laser offers new Benefits
There are numerous benefits to these solid state light source projectors, but the bottom line is that they address the needs of the market and will be adopted in growing numbers.
Their qualitative brightness superiority and potential for energy savings combined with the significant reduction of maintenance cost makes it likely that they eventually replace lamp-based projection systems as the primary projection light source in the future (69% of installation market expected in 2019 according to Futuresource).
Main Solid State Light Source Technologies
The three most important technologies, LED, laser phosphor and RGB laser, are described below.
Optical Architecture of LED Light Source
This was the first solid state projector type to be commercialized about 7 to 8 years ago but it is limited in the light output and mainly used in specialty markets.
LED systems include only red, green and blue LEDs to produce images that adhere to the SMPTE color space.
Optical Architecture of Laser Phosphor Light Source
Laser-illuminated projectors use arrays of laser sources illuminating a microdisplay engine. In the most common Laser Phosphor approach, a blue laser is used for creating the blue color in the final image, but the blue laser is also used to illuminate a yellow phosphor wheel, which emits yellow light. This yellow light is then split by a prism or color wheel into green and red light.Maximum color space is limited to the SMPTE standard.
Optical Architecture of RGB Laser Light Source
RGB laser on the other hand, uses the so-called ‘pure laser’ technology. Here red, green and blue lasers deliver the light directly. The product of this technique is an absolutely pure colored light that is split into the three channels. The light is emitted in a very narrow band in discrete frequencies. This makes it possible to realize a color space that reaches BT2020 therefore exceeding even that of AdobeRGB.