Jump to content
  • 0

SI: The Science Of The Laser Projector

Rate this question


Christopher

Question

ttl

Would it be a surprise if I told you about a display system that was coming so far advanced in color reproduction it would make a fool out of LCD’s and an OLED would blush? Throughout the last few decades we have gone from CRT, LCD, and are moving closer to OLED displays. There is something far more advanced coming in the next five to ten years – a laser projector. In 2008, Sony succeeded in developing the world’s brightest red laser diode array. Featuring 7.2W optical output power and a 635nm wavelength, this red laser diode array is ideal as a light source for projectors and so forth.

Generally speaking, displays combine red, green and blue light to create full-color images. Displays based on laser technology, therefore, use a tri-laser combination (one laser for each of these three colors). Laser displays in general offer key advantages in that they ensure advanced definition and a wide color gamut of 150% – far beyond that of LCD (70-90%) and OLED (100%). Of these three lasers, red laser diode arrays must be able to deliver high brightness along with efficiency and the ability to operate at room temperature in order to be used in projection equipment.

img_01

Lasers offer the following advantages in serving as display light sources.

  • Excellent monochromaticity of laser light ensures excellent color reproduction. Imagine the most brilliant colors you’ve ever seen; a red so bright and crisp its comparable to a street light.
  • Definition can be increased thanks to the excellent light-focusing characteristics of lasers.
  • Because the light is polarized, excellent optical efficiency can be achieved without using optical elements to align polarity when lasers are used in conjunction with liquid crystal panels.
  • Laser light sources last longer than lamps – about ten times as long, approaching 15,000 to 20,000 hours.

Creating a laser light source requires the combining of red, green and blue lasers (capable of generating optical output as high as several watts). Sony has remained a leader in the development of laser displays, including the development of compact laser light sources capable of high optical output power.

Untitled-2

At Expo 2005 in Aichi, audiences were spellbound by the beautiful images displayed by Sony’s Laser Dream Theater, which was the biggest laser display system in the world – an 164 foot laser projection system using an 11-channel sound system, to screen short called “Voyage Around the Earth”. Sony has been very quiet about this technology until very recently, leading us to believe that it is still actively investing great resources into this method.

A laser “array” is composed of multiple light-emitting laser elements arranged side-by-side to form a single element and the array approach increases the optical output capacity achievable with a single device.

img_02

The diagram above shows the structure of the red laser diode array developed by Sony. To achieve a high optical output power from a single light-emitting unit, Sony increased the width of the laser stripes through which current flows to produce up to 60

Link to comment
Share on other sites

0 answers to this question

Recommended Posts

There have been no answers to this question yet

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Answer this question...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...