The following information is true and accurate at the time of publication.
Sony Develops a [Grating Light
Valve] display device that gives high resolution, excellent
contrast ratio and wide color reproduction
-for future use in projectors
and projection TV products-
Sony develops a new [Grating Light
Valve] projection display device that gives superb resolution,
high contrast and wide color reproduction.
Device [Grating Light Valve] (Prototype)
In July 2000, Sony announced the signing of a technology
licensing agreement with Silicon Light Machines (Head Office:
California, USA) in relation to [Grating Light Valve]. Sony's
aim was to independently develop display products using
[Grating Light Valve] that could be mass-produced and marketed.
Since the earlier announcement, in order to make this new
display system a reality, Sony has worked to develop a [Grating
Light Valve] device and essential [Grating Light Valve]
related technologies such as Micro Electro Mechanical System
(MEMS) technology and components, and laser light source
[Grating Light Valve] display technology uses micro ribbon
array (one-dimensional micro mirrors) that enables projection
of high quality, large size images. Differing from other
devices that utilize a two-dimensional (vertical and horizontal)
structure, [Grating Light Valve] uses only lined micro mirrors
enabling a much simpler device structure. In addition, by
using high color purity RGB lasers for the light sources,
it is possible to obtain wide color reproduction that is
over twice the color reproduction area of CRT technology
(please see CIE1931 chromaticity diagram).
In this newly developed display technology, the [Grating
Light Valve] device is the kernel that consists of one-dimensional
diffraction gratings on a silicon base, manufactured using
MEMS technology. The diffraction gratings can fractionally
alter their shape by the use of electronic signals, i.e.
the image signals can be used to control the grating ribbon's
displacement to result in controlled diffracted light intensity,
providing precise and accurate pixel-by-pixel brightness
control. This key feature of [Grating Light Valve] device
enables realization of smooth gradation control and a contrast
ratio of over 3000:1, resulting in rich and detailed images.
The [Grating Light Valve] device that Sony demonstrated
today uses 6 ribbons as the diffraction gratings for each
pixel and consists of total vertical number of HD-equivalent
1080 pixels (total of 6480 ribbons in a line)
The RGB laser light sources are illuminated as a line onto
the corresponding [Grating Light Valve] device, forming
a one-dimensional image of 1080 pixels. This one-dimensional
image is then scanned horizontally using a scanning mirror
to create a two-dimensional image. The present device allows
horizontal scanning of 1920 pixels, providing capability
for 1920 (horizontal) x 1080 (vertical), the same as full
HD progressive image reproduction.
In the future, Sony will continue to research and develop
[Grating Light Valve] technology with the aim of introducing
this device into the professional projection market and
high quality home theatre products within the next two years.
Display Device[Grating Light Valve]main features
Light Valve x 3[RGB]
x 6 x 2mm
pixel[Compatible with full HD]
Frame, Progressive Scan