Liquid crystal on silicon (LCOS)

2. INTRODUCTION
 Liquid Crystal on Silicon is a micro-display
technology. It produces much
higher resolution images.
New Liquid Crystal Micro
Display
 LCoS can produce truly high
definition video that is
capable of surpassing either
LCD or DLP.

3. What is Liquid Crystal Over Silicon Technology?
It is transmissive and reflective
technology.
Hybrid between LCD and DLP
technology.
 Liquid crystals are applied to a
reflective mirror substrate.
LCOS-based projectors typically use
three LCOS chips, one each to modulate
light in the red, green, and blue channels.
LCoS Chip

4. HISTORY OF LCOS
 General Electric first demonstrated a low-resolution LCoS display in
the late 1970s
 At the 2004 CES, Intel announced plans for the large scale production
of inexpensive LCoS chips for use in flat panel displays. These plans
were cancelled in October 2004.
 Sony and JVC both produce and market front-projection displays that
use three LCoS panels
.
 As of October 2013, LCoS-based rear-projection televisions are no
longer produced.

5. MECHANISM OF AN LCOS PROJECTOR
1. The lamp creates a beam of white light
2. The beam passes through a condenser lens that focuses and directs the light.
3. The white light is separated into red,
green and blue light by a polarizing
beam splitter (PBS)
4. Then the beams of colored light
simultaneously come into contact with
one of three LCoS microdevices
5. The reflected light from the
microdevices passes through a prism
that combines the light.
6. Prism directs the light - which now creates a full-color image - into a
projection lens, which magnifies the image and displays it on the screen.

6. DIFFERENT LAYERS OF A LCOS DEVICE

7. LCoS devices are tiny-most of them are less
than one inch square which are reflective in
nature.
 LCoS devices have only a very small gap
between pixels. The pixel pitch -- the
horizontal distance between one pixel
and the next pixel of the same color -- is
between 8 and 20 microns (10-6). This
reduces or eliminates the "screen door"
effect found on some DLP televisions
and helps keep the image smooth and
uniform.

8. CATEGORIES OF LCOS
THREE PANEL:- In three panel designs, there is
one display chip per color, and the images are
combined optically.
SINGLE PANEL:- In single panel designs,
one display chip shows the red, green and
blue component in succession.

9. ADVANTAGES LCOS
No Visible Pixels, because of minimum space between
the pixels
LCOS the pixel edges tend to be smoother compared to
the sharp edges of the micro-mirrors in DLP
Provides Rich Color.
No Rainbow effect in LCoS.
A comparative observation on 3 kinds of monitors, respectively LCD, DLP & LCoS.

10. LIMITATIONS OF LCOS
Many LCoS projectors also have limited lamp life in the
1000 to 1500 hour range and on certain models lamp
replacements can be much more expensive than they
typically are with LCD or DLP projectors.
Currently most LCOS products are rated in the range of
500:1 to 800:1 which is much less than most DLP
products are able to achieve.
High Price Tag

11. FEATURES OF LCOS TECHNOLOGY
LCoS is a reflective based display technology that can
produce very bright high resolution images.
Flicker free images with refresh rates up to 120 Hz.
It easily handles HDTV resolutions of 1920×1080 and
the technology is scalable up to even higher resolutions.

12. LCOS GEN-II
High image refresh rates are effectively free of flicker and
color breakup.
Achieves Contrast ratio >2000:1
Provide high resolution which offers a rich users experience.
High fill factor delivers smooth images without pixilation
Rich colors depth of crisp, life like images.
Highly reliability and long lifetimes suitable for consumers
application.

13. HDTV LARGE AREA DISPLAY
TECHNOLOGY OVERVIEW: