Sony SRX-R210 Sxrd Technologies, Vertically Aligned Liquid Crystal System, Short Response Time

SXRD Cross-Section view

SXRD Cross-Section view

Glass Substrate

Vertically Aligned Liquid Crystal

Silicon Backplane

High-Density Pixel Pitch 8.5 µm

• 4 x Full-HDTV (4096 H x 2160 V pixels)

SXRD Technologies

In addition to their extreme resolution and high contrast, the SXRD devices used in the SRX series projectors have the following remarkable technological features:

Vertically Aligned Liquid Crystal System

In every type of projector system, displaying absolute black is a major issue in order to achieve a high contrast ratio. In other words, the contrast ratio of a projector depends on how effectively the light from the source can be blocked so it does not leak through the imager.

All Liquid Crystal Display (LCD) devices control the amount of light to be projected by applying an electric field to the liquid crystal gap. In typical LCD devices, black is produced when an electric field is applied across the liquid crystal cell gap. However, molecules near the surface of the glass substrate may not be accurately controlled due to the influence of the alignment film. This is not an issue for bright images. However, when displaying dark images, light may tend to leak from the LCD device, since the molecules near the surface are less accurately controlled. This results in a creamy black instead of a deep black.

The SXRD device does not exhibit these characteristics. This is because the Vertically Aligned Liquid Crystal system displays black when

Thin Liquid Crystal Cell Gap

Another important enabling factor of high contrast is the SXRD device’s ultra-thin cell gap of less than 2 micrometers. In conventional Vertically Aligned Liquid Crystal systems, a thin cell gap could not be achieved. Sony has overcome this difficulty through the use of Sony’s innovative planarization technology in the silicon backplane structure and an advanced Silicon wafer-based assembly process.

The SXRD device also adopts a structure that does not use “spacers”. These are columns found in conventional reflective liquid crystal devices to maintain a constant gap between the liquid cell floor and the top of the device. Spacers tend to both scatter and reflect light, which can impair high-contrast pictures. In the spacer-less SXRD device, these artifacts are no longer seen.

Short Response Time

The thin cell gap structure in SXRD devices also contributes to an ultra-fast response time of 5 milliseconds. The SXRD device reacts promptly to an instantaneous change of picture content, enabling it to display a smooth motion. Consequently, the SRX-R220 and SRX-R210 virtually eliminate motion blur; a particularly significant benefit for visual content that includes fast-moving objects.

Reliable Imaging Device

The SRX-R220 and the SRX-R210 use a high-power, bright lamp. As a result, special attention has been paid to the reliability of the SXRD device. The inorganic materials utilized for the alignment layer of the SXRD device are resistant to deterioration or deformities that could occur due to the intense heat and light generated by the powerful lamp system.

the electric field is not applied and because all molecules are in the correct alignment, the polarized light alignment is also

optimized. The direct result is a far deeper black level, leading to a high contrast ratio.

Light

Thin Cell Gap (2.0 µm) Space-less

• Short response time < 5 msec

• High Device Contrast ratio 4000 : 1

Inorganic

Alignment Layer

• High reliability

Aluminium Pad

Narrow Inter-Pixel

Spacing (0.35 µm)

• High fill factor 92 %

• High reflectivity

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